Discover the Surprising Flaw in Center Channel Speakers

everybody this is aaron from aaron's audio corner and today we're going to talk center channels and why most center channels they just kind of suck i mean let's be real so in this video i'm going to explain to you why that is what to look for in the data and in the physical design of the speakers so you can better make a a more qualified purchase for your situation whether it be your budget home theater needs multiple people in a listening room or just your seat those kind of attributes that go along with the factors that roll up into a purchase decision [Music] in order to help me keep my thoughts together because there's so many places to go in this video i have created a set of slides in powerpoint i know it's kind of nerdy but trust me it'll it'll benefit both of us and i have provided those to all my patrons so my patrons can download this slide set after this video is published and we're going to kind of step through some slides i'm going to give you some examples and data and i'm also going to do some sound demos of different speakers in my home theater at different listening axes so you can understand just what the data means and just why i have an issue with so many popular center channels that are available right now and hopefully this video will enlighten you it'll make you more aware of what to avoid what to buy and in situations where maybe you just can't stretch your budget that far um things that you're going to be giving up and better be able to use the speakers that are maybe not as good as some of the other options that are available first off the ford now this video is not intended to be a here is exactly what to buy i'm going to be talking about a multitude of center channels that i have either purchased myself or that i was loaned from a manufacturer and i'm not making this a shootout per se it's really a design analysis we're going to be talking about how speakers are designed the faults in their designs what to look for in the data and how to determine what is good about a speaker or bad about a speaker really just by looking at its basic specs its look and then looking at my data to determine where you're going to be making compromises this video will run long i'm going to edit this thing down as best i can but i just know that it's going to be long because there's so much to get through and i think that everything that i'm going to provide you really is critical to your understanding while this video will be long trust me i am simplifying some aspects of what i'm going to talk about if if you're like me you're much much more of a gray person you're not a white or black you see a lot of middle ground and when i do analysis it's really hard for me to go off on one side or go off on the other side there's a lot of questions i ask myself as i'm going down the middle those can lead to rabbit holes i'm gonna do my best to avoid those rabbit holes and i think that you'll be glad i did i do encourage you to come back and look at the data at your own leisure and pay attention to the data in my future reviews i will link all the reviews for all the center channels that i'm talking about here but i will continue to review more and more center channels so we can get a better data set and a broader feel of the center channels that are available to us as we go along the most important question to ask yourself when you're about to purchase a center channel is what is the purpose of the center channel the main purpose is to be used in a home theater setting it's not so much to be used in a stereo setting the center channel is used to anchor dialogue at the screen in a home theater situation or even if you just got like a living room set up with multiple speakers you want to use a center channel to anchor that dialog right near the center of the sound stage otherwise you're depending on phantom center and phantom center can be problematic because as soon as you go to the side of the center of that sweet spot then the dialogue just drops off significantly in standard two channel setups now that isn't to say that center channels aren't without their own issues which is specifically what we're going to talk about in this video how does a center channel achieve its purpose then well number one you want good linearity you want good tonal balance from the lowest of frequencies to the highest of frequencies now certainly you don't have to play down to 20 hertz but you want it to be playing you know let's say 80 hertz 100 hertz or maybe as low as 200 hertz but you wanted to play linearly throughout you don't want any hot spots or significant peaks or dips in the sound coming toward you but you also don't want that same issue with the sound going toward the walls because whatever hits the walls is also reflected back to you at the listening position if you're sitting in the prime spot or if you're sitting off to the side and no matter what you hear is going to be the culmination of the direct sound and the reflected sound anytime the reflected sound is different than the direct sound significantly then you're going to have impact on the timbre or the tonality of the sound another aspect you really want to look for at least in my opinion is you want broad horizontal dispersion what do i mean well i mean that you want the radiation pattern coming from the speaker to be the same as it is directly in front of the speaker as it is to the side of the speaker now certainly the treble will fall off and we expect that but what we don't want is we don't want major dips and then major peaks as you go off axis of the speaker for the same reasons i just discussed the broader the dispersion the more you can get away with sitting further and further off to the side but most standard center channels don't really have that luxury spl i'll put a question mark here the reason for that is because not everybody needs a ton of output from a center channel and i really don't want to get into that in this particular video i've actually recently done a video discussing the merits of two channel speakers versus home theater type speakers and you can check that out i'll throw the link up here in the card also throw it in the description below now with that said we're going to focus on dispersion characteristics first off i want to talk about the different configurations that center channels come in most often center channels come in a toppled mtm which as you see here is a mid tweeter mid but flipped on its side like this another configuration is the two-way mmtm which is a mid or mid woofer with a tweeter in the middle and then another mid mid woofer pairing to the side this is a two and a half way wmt and that is midwoofer mid tweeter mid mid woofer now the 2.5 way the 0.5 way that comes because there's overlap in the frequency band of those outer woofers that helps to increase the sensitivity but can also be problematic as you go further off axis of the listening angles this is a two and a half way concentric or coaxial design with a woofer on each side and the coaxial in the center this is a three-way coaxial speaker with woofers on the side and a coaxial speaker in the middle this is a three-way wmtmw we got two woofers one on each side and we've got two mids and then we've got a tweeter and then this is a three-way wtmw now this is a more standard type configuration that you would see in a three-way design and they're not necessarily standard in the world of center channels but they are more standard if you're talking about configurations for tower type speakers where you would have a tweeter at the top a mid-range below it and then maybe multiple woofers below that in this case the woofers are placed to the side now the issue with most of the center channels is that the vast majority of them are the two-way mtm type a lot of them are oversized with duplicate drivers meaning multiple woofers sometimes multiple mid-ranges and when you do that you have more opportunity for error also note that more doesn't mean better they are typically just filler in a product line and they're often designed to match the look or the aesthetic of a speaker but not so much the timbre now this one is going to be controversial because i know a lot of people believe that just because a speaker looks similar to its maybe bookshelf or tower speaker counterparts that it's going to sound the same and more often than not i find that to not be the case what i do find is that they look very similar they may have similar characteristics but they really don't sound the same once you start going off axis and that off axis really matters so if you were to just take an anechoic response of the speaker on axis then they may look similar but once you put that speaker in a room and you evaluate the contribution that you have from the reflections off the sidewall it's a totally different ball game and i will say again that most of the time what you see you're not going to get the same so your center channel may look very similar to your tower speaker or your bookshelf speaker but note that without data you're not going to have a lot of confidence in knowing for sure that it's going to sound the same and that's an unfortunate reality the crux of this issue is that the spacing between these multiple woofers or multiple mids and the combination of a poor crossover design results in very poor off-axis response causing the off-axis listeners the people to the side of you in your home theater setting to hear something very different than what you hear sitting directly in front of the speaker so let's focus on that last bit now here i've just gotta give you an illustration you've got your crossover you've got your graphic to show what a crossover or an ideal set of crossovers may look like and then you've got this graphic at the bottom with a ruler now why am i showing you the ruler well i'm going back to noting that the distance between multiple drivers especially with the toppled mtm design is really going to be problematic to the sound overall in this case you've got about i don't know that's a four inch driver so this obviously isn't a scale but i would say you're looking at about maybe that might actually be 12 inches between the two now i can use math and i can tell you that at some certain frequency you're going to have problems where those two speakers don't form the same sound field they don't sum together properly and they start to counteract each other at low frequencies they may sum together to make one mono sound but at higher frequencies they start to fight each other they cancel out and they do other ugly things and even though they have a tweeter smack dab in the middle that often doesn't resolve the issue because the tweeter is crossed over above the point where those two woofers on the side had their problems so what i'm going to do is i'm going to give you an example using a ripple tank now the ripple tank is a free tool it's a javascript tool that you can go and play with online at your own leisure i really do suggest you do that after watching this video but i want to give you an example of what goes on when you have one mono signal say maybe just a a coaxial consensus speaker or when you have multiple speakers and then show you what happens when you change the frequency from low to high and or you expand the distance between those two sources i think doing this will give you a really good idea of what i mean when i talk about comb filtering and lobing the effects that are created between the two drive units in a speaker for the first example we're going to look at a single source so a single speaker radiating out into space just so you can kind of get a feel for what a baseline would be i'm going to go to the right i'm going to make sure i'm on single source waves sound waves and then color scheme i'm going to play around with that i'm going to pick a different color scheme i like this more so simulation speed i'm going to slow this down a little bit just so it's not too much to take in all at once and the resolution i'm going to leave there source frequency so you can go low to high and we're going to start off with low frequency as you can see just one sound source you've got waves going out in the space so you can say that you would be right here as a listener you're hearing everything pretty fun and evenly if you've got other listeners off to the side then they're going to hear things pretty much the same way as you do now let's increase the frequency to some relatively higher frequency and you can see that the frequency is changing here from the source and now you're at higher frequencies because the wavelengths are shorter and then the same thing stands if you're in the center you hear the same thing as the people off to the sides and this is just a mono source and this is what you would expect now i've got two sources as you can see by this drop down over here but i've got them stacked right on top of each other so that's where the square box is and as we can see it's the exact same thing and and in the real world you're never going to have two sound sources that are stacked right on top of each other it's just not physically possible the closest you can come to that would be a coaxial speaker but you're not going to have a mid stacked on top of a mid this is just more for illustration so you understand that when i do move the second source apart from the first source that you do get a change and that change is relative to the single source effect so what we're going to do here is we're going to separate these sources a little bit and keep in mind we're still at a pretty low frequency relatively speaking and these two act as one source because the wavelength compared to the distance between the sources is long low frequency long wavelength but what happens if we increase the frequency we get shorter wavelengths and now we can see a pretty significant difference here right so the person is sitting in the center and the person sitting off to the sides out here they're going to hear about the same thing but what happens if you're right in the middle here you're sitting in a null that's problematic and as you go even higher in frequency you have more cone filters and then those nulls become even more distinct and they are more of them let's go back to to source low frequency again acting as a mono source but let's spread them out a little bit further apart oh now we see a difference here right now you see that you've got some cancellations via cone filtering so you've got some solid lobes going on here from each of the mono source signals and then that is what creates a null at one of these angles or i should say at both of these angles off to the side and then again if we increase the frequency now it's vastly different look at the number of nulls that you have going out into the room many many many of them and then keep in mind that this isn't even showing reflections coming back the reflections are going to be even more problematic when you factor those in now that you've got an idea about what it means to have low crossover frequency versus high crossover frequency versus the distance between two drivers like two mid ranges or two mid woofers now let's talk about how that applies to the real world so in this graphic i've illustrated a typical home theater overhead view i conducted a poll maybe like a month or two ago where i asked people hey how far do you typically sit from your screen your your center channel speaker and the overwhelming majority i mean i think it was well over 80 maybe even 90 percent of the people who responded responded by saying that they sit between about six to 12 feet from their center channel speaker and based on typical seating distance off to the side that means that your side listeners could be listening anywhere from about maybe 10 to 30 degrees just depending on how close you are or how far away you are from the center channel combined with you sitting dead in front of the speaker overall the sound field that you really really want to pay attention to is that 0 to 30 degree angle and certainly you want to pay attention to what's going on past that but as i said i'm trying to simplify things down for the purpose of keeping this video succinct as as much as i can but also not trying to flood you by giving you too much information at one time so purposely i am not talking about the sidewall reflections when i'm talking about the data going forward what i am talking about is paying attention to the radiation pattern between zero plus or minus 30 degrees to the side in a typical home theater setting what do your guests your family your wife your kid your parents your sisters your brothers your friends what do they hear when they're sitting off the side and do you care well it's going to depend on the design of the speaker so what we're going to do is we're going to walk through some examples of how to use the data that i provide to help you understand what they hear we're going to use a horizontal radiation pattern plot from my data and this is something that's unique to my website that i generated with my own matlab script based on the clipable spin data this is the clippable this is a clippable near-field scanner now the near-field scanner measures a speaker in an non-anechoic environment but provides you with anechoic data using some really state-of-the-art robotics and some advanced mathematics stuff that's beyond me way over my head the reason that you care about that is because you really do want to isolate what the speaker is doing now you may say well as soon as i put the speaker into my room everything changes so your data doesn't matter well i understand the thought train there but the fact is that that's just not entirely true with anechoic data you can predict how the speaker is going to sound in your room to a very alarming degree and i've actually got a video discussing that i'll put it up here as well typically above about 500 hertz the anechoic data can predict within a db or two what you're going to hear in just about any seated position in your room or any typical seated position in your room and also using this data you can better predict what your friends are going to hear when they're sitting off to the side and that's why we use this data now this is an example of my horizontal radiation this is a bird's eye view down into the sound field of a speaker and you can see that i've got the axes labeled back front left and right and then primarily i've got zero degrees at the bottom minus 30 and plus 30 to the left and right so that would be typical seating arrangement we're going to focus on that 0 and plus or minus 30 degree angle and as i said before we're not going to really talk about the sidewall reflections or any reflections that come from angles higher than that right now now i've taken that sound field and i've overlaid it into the graphic that i've talked about earlier because i think this may give you a better understanding or a better appreciation of what that plus or minus 30 degree angle window is going to tell you as far as the data goes so you can see here it's pretty straightforward you've got the speaker as your sound source and then you've got zero degrees coming straight down that would be the primary listening position and then plus or minus 30 degrees off to the side what you really want to pay attention to in this data is wherever the red or orange colors the dark red the darker orange colors are that's where the highest intensity of sound is going to be any color that goes from orange to blue so yellow or green any color like that that's going to be lower spl so let's start with the mica mb42xc zero degrees primary listening plus or minus 30 degrees off this side what do you see in this data well off the bat you can see that if you're sitting off the side especially at the 20 degree angle you're not going to hear i mean you're sitting in a hole at around three and a half kilohertz or 3.2 kilohertz i should say but the majority of the sound pressure from about plus or minus 10 degrees is pretty good it's right there in front of you but once you start moving off to the side those people are sitting off the side they're going to be way down a level so if we look at this red is around 87 and then if we go to this green and yellow we're at about 75 to 78 so you're at 12 to 9 db difference in the sound intensity as you go from directly on axis out to 30 degrees and that's quite a huge bit of difference the thing to note though is that it also occurs in the higher frequencies so about 1.3 kilohertz to about what is that 5 kilohertz or so so smack dab in the upper mid range to the treble region is where you're going to have that really distinct difference in sound lower frequency it's not going to be as noticeable but it is there and it's closer to about 6 db difference with the polk xt-35 where you have multiple mid-ranges all overlapping we see that null that i talked about earlier it's the same thing as we just saw on the mica as you go off axis it's a distinct drop-off in sound and now we've got the coaxial from kef now look at this see how much red there is even out to 30 degrees even out to 40 degrees and some spots in frequency as much as 60 degrees so you've got a much broader radiation pattern with this particular kef speaker now we talk about the emotiva c2 plus now this is a three-way speaker so you would think most of the time people will say a three-way speaker is going to be fine well that's not always the case and this speaker shows you again why you've got two mids that are overlapping and they're going up to a higher frequency they should have been crossed a little bit lower we can see the detriment of that where you have some spl drop and again we're talking about 6 to 12 db just depending on where you're looking at in terms of the frequency response area we can also see there's nothing sent to the back of the speaker so you have a fairly narrow radiation pattern but it's not quite as narrow as something like the mica that we talked about or the polk that we just looked at now we're going to look at the svs prime center this may be the best speaker in terms of horizontal radiation that i have measured so far now i'm not saying it's the most linear in frequency response but again we're talking about horizontal radiation for the purpose of this video and look at that you're out to plus or minus 60 easy at pretty much every frequency up until the highest you can pretty much sit wherever you want with this speaker and the spl is going to be roughly the same as the person sitting directly in front of the speaker now just for reference let's look at a small bookshelf speaker this is the orindal 1961 bookshelf speaker and this is very much the same as the sbs it's not as wide but it is even throughout the response so you can go out to about plus or minus 40 degrees and it's pretty much the same thing no matter where you sit certainly you can go out to 20 degrees and be okay 25 degrees 30 degrees beyond that you know you do change a little bit but it's about 3 db and spl so it's not nearly as significant as what we saw previously with some of the other designs i've done all that i've shown you the data but i want you to understand what i'm talking about and how it relates to sound so let's go ahead with the sound demo before we do it though let's talk about a few important notes i measured eight speakers and i recorded them all using binaural mics and i measured them using the umic one with the moving microphone method and pink noise in my home theater the binaural recording was done at two different angles zero degrees and 25 degrees i use pink noise for one reason to avoid any kind of copyright issues but the other reason is because the difference in switching tracks is much more noticeable as opposed to me using something like talking or just something random you can still notice it but it is immediately noticeable and and we don't have a lot of time for this video so i want to kind of get through the fluff and get to the punch real fast i banned past the signal that you're about to hear between 303 kilohertz now the reason i did that is because as you go higher in frequency you expect the treble is going to fall off i don't want you to pick up on that treble and get swayed by that too much within reason it's okay but the purpose of this video is really to talk about the hole in response that appears typically through the mid-range this is the most important part about the sound demos that i need you to know do not use this to compare one speaker versus another only use this to compare zero degrees versus 25 degrees then why did i measure it 25 degrees well the reason i measured it 25 degrees is because that's where the seat angle is for my home theater but i don't want you to compare you know one speaker versus another speaker because these number one they're not level matched and number two that's not the purpose of this video it's to help you understand what the sound difference is for you sitting in front of the speaker versus your buddy or your wife or whatever sitting off to the side of the speaker it's important to understand that you're going to hear something different in some cases and in other cases you're not going to hear much difference if any at all in the cases where you do hear something different it's it's not good most of the time it's it's really bad because there's a distinct difference in the dialogue level in some of these poor performers now i'm only going to give you a sample but i'm going to give you some of the more standout examples and and i've chosen specifically also this is not a replacement for being there again i want everybody to understand that this is really intended to be used to compare one angle versus another okay moving on put your headphones on go ahead and do that pause this video go grab them and then come back first example is going to be the mica mb42xc this is zero degrees then we're going to switch to 25 degrees and then roll on through [Music] do you hear something different you should have what you should have heard is about a 5 db difference in the lower treble region above about 1 kilohertz and that matters now let's go to the next example [Music] what you heard there is about a 3 db difference throughout the mid-range entirely now for the sbs [Music] svs pretty close there is a difference in the lower to mid mid-range but the treble region is pretty much the same now let's switch over to the kef [Music] now the kef very minimal difference between the two there's some minor difference but it's pretty minimal now we're going to look at the orindal 1961 bookshelf speaker the reason i chose this is because it's a it's an alternative instead of laying down an mtm design or having a horizontal center channel a lot of people in home theater will use an acoustically transparent screen and they'll put speakers behind that screen so as an example you could use the orindal behind the screen or in this particular speaker you could actually just put it below your television if you wanted to small enough but anyway so zero degrees [Music] and very very minimal difference i mean you're talking about one to one and a half db at the most from zero to 25 degrees that's pretty darn awesome for what it's worth all the recordings and the rew raw data are going to be available to my patrons so patrons pay attention for that generally speaking two ways are going to be a no go and the reason for that is for what you've heard and what you've seen and the data when you have an mtm design laid over like that horizontally the difference between sitting directly in front of the speaker and sitting off the side is pretty vast for a two and a half way design that's going to be a little bit dicey just kind of depends depends on how far apart the drivers are spread and where the crossover points are most the time though two and a half way designs just don't quite work out great unless it's something like the kef the kef q650 that's a much better design and it's a two and a half way design three-way designs are a go no-go thing it kind of depends if you look at the sbs with the tweeter and then the mid-range below it and the two woofers of the side that's a good design and it sounds pretty much the same from seat to seat within reason but the emotiva is a three-way design and its two mids caused it to have a cancellation in the mid-band frequencies which you heard and you saw on the results my recommendation is first off look at the design how far apart are the drivers what is the crossover point between the drivers and this is especially important with multi-driver design so multiple woofers or multiple mids and use the data to guide you what speakers should you use well again use the data consider where you're going to be sitting do you have multiple seats or is it just you what kind of output levels do you need are you willing to trade spl versus linearity what looks good and fits your home decor and also consider that more doesn't always mean better a lot of the stuff is going to be personal at the end of the day you're going to use the data hopefully to narrow down some choices from the ones that measure well look like they'll fit your knee so if it's just you and you don't necessarily care about the off axis performance you should but let's say for the time being that you're going to not worry about the off axis reflections then you may be willing to sacrifice some clarity or something like that from the other seats in order to get higher spl you get higher spl through having multiple drivers so multiple warfares or multiple mids then what looks good or fits your needs you may not have the space for a tall center channel like the sbs or like the like the kef's you may have to go with something slim like the pol xt-35 that i mentioned that has multiple arrayed little mid-ranges it's not a great design but it may fit your needs and you may just be left with that as your choice but do remember that just because you have multiple woofers or multiple mids doesn't mean that the design is not going to be flawed there could very well and most likely are issues with that design now if you want to talk about trading linearity versus spl make sure you watch the video that i discussed previously about home theater speakers and home audio speakers i'll put a link up here in the in the card and i'll drop one in the description below that really goes over the factor of eq ability of a speaker and i really think that's going to come into play in this topic as well for many of you my final suggestion is really consider where you're going to be sitting and we talked about spl and linearity and the looks of the speaker but also consider where you're going to be sitting as i said earlier some people sit as close to six feet some people sit as far as 12 some people sit 15 feet let's make up numbers here as an example if you're six feet away from the center channel then three feet off the side for your buddy who is sitting off axis that may be 30 degrees but if you're 12 feet away from the center channel then three feet away maybe 15 degrees i'm making these numbers up off the top i'm not gonna double check so just for what it's worth i know some of you out there will care i hope that the people watching this video understand it's just for illustration purpose only but hopefully you get my point that the further you are away from the speaker the less angle there is between you and the person sitting the side of you so you know zero to ten degrees may be okay zero to thirty degrees may be something that you need to pay attention to if you're sitting closer to the screen or the center channel alternatively you can go with a bookshelf speaker or a tower speaker and this is really where the home theater crowd that uses acoustically transparent screens comes from this is where they're talking about this is why we want to use acoustically transparent screens because you're able to use the exact same speaker across the front array which means that you truly are timbre matched and also you're able to get better horizontal radiation more even response from seat to seat you don't have to worry about sitting three feet over and the person next to you not being able to hear the dialogue because that's really important there's a lot of dialogue issues with movies of late there there's an article i read about this recently and i'll try to remember to drop it in the description as well but i think a lot of you probably heard about what i'm mentioning here is newer movies they don't they don't have the dialogue levels quite right so if you're sitting on axis and you've got a speaker that performs poorly off axis everything sounds great to you but your wife or your kid or your buddy they may have a little bit more trouble discerning what somebody is saying on the screen now luckily we've got their mouth moving so we can kind of figure it out we can discern that but you really don't want to make things even worse for somebody sitting next to you and that's why i made this video because i want people to understand that number one the data matters number two you can use that data to help you make a better purse decision but also i want people to understand that just because a speaker looks the same as its bookshelf or its tower speaker counterparts does not mean it's going to sound the same and many of them are very very fundamentally flawed in design sitting on axis versus off axis is going to yield as you saw in these examples as much as six even some cases as much as 12 db difference depending on how far off access you sit now within reason certainly some of that's expected you know you're going to drop off an spl but you can't have a hole right through the mid-range and then the tweeter pick right back up and and burn your ears but you're unable to tell what they're actually saying in the mid-range area that's not acceptable so i want you to be aware of that that's it for this video i appreciate you staying hanging around this long if you did if you want to support the channel you know i've got a patreon you can join me at patreon.com aaron's audio corner uh if you want to support but you don't want to do the patreon thing what i'll do is i'll drop a few generic affiliate links below i'll do one for audio advice amazon and i'll try to think of a few others and if you want to go shopping for yourself and maybe pick out a speaker because i'm not gonna link to anything specific i don't wanna the video isn't about doing the best of uh if you wanna go shopping for a speaker design that you're interested in and you wanna help the channel out you can use one of those affiliate links i get anywhere from like two to six percent and i use all that money to help fund what i'm doing here on this channel and on my website i've used patreon funds and affiliate link funds to purchase the four or five different speakers that i purchased for this video and they were all paid for out of my pocket sometimes i give them away to patrons and sometimes i sell them locally when i'm done with them my patrons if you don't mind vouch for me below because i don't want people thinking i'm making this stuff up so anyway that's it also if you don't mind please hit the like hit the subscribe button if you haven't already that would be very much appreciated because the more people i can get interested in the technical details and the more science and the more understanding we all have the better off we are as a community and the more manufacturers will probably pay attention and be more willing to give us product that just doesn't look the same but also sounds the same and that's important so again i appreciate you watching and hanging around i will talk to you all later take care peace

Channel: Erin's Audio Corner

Views: 334,102

Keywords: erinsaudiocorner, erin's audio corner, erin review, erin klippel, erinsaudiocorner.com, erin hardison, best budget subwoofer, subwoofer review cea-2010, cea-2010, budget subwoofer review, center channel buying guide, home theater center channel, best center channel speaker, center speaker, home theater speaker, best HT speaker, HT center speaker, mtm speaker, 3-way speaker

Id: GZrdsxrcpBw

Length: 35min 43sec (2143 seconds)

Published: Mon Feb 07 2022