Dive Into Deep BASS: Build Dual 21 Inch Subwoofers Yourself! - Earthquake 21's
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- Опубліковано 28 лис 2022
- #subwoofer #bass #bassboosted
Ever wonder if a 21" sealed subwoofer can create bass you can feel? Check out this build as I take an SB Audience Rosso 21SW800, where I test whether or not room gain can help me reach subsonic frequencies in my room. Tested and revealed both room gain and bass that you can feel.
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21" Rosso Sub: bit.ly/3OK4CYY
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We got to see the moment Nick realized he was a basshead.
Haha! I mean I do like this, but I also feel like there can be too much bass 😂
@@Toid no such thing
@@blakebrockhaus347 😂🤣😂🤣
We really need to get you and Justin to Slamology next year.
There can never be too much bass.
Quick hint: Tee nuts which have the teeth on them are very difficult to install unless you can hammer them in. This is even more difficult on the inside of an enclosure. They also don't work that well on MDF. There is a variation called a Propell nut, which does not have teeth on the flange, but has small ridges on the barrel. These are much easier to suck in with a bolt and work much better when you don't have hammer access. If you are worried about spinning them in the hole, just apply a dab of epoxy when you install them. Available at most woodworking stores and Mcmaster Carr.
Thank you unfortunately I learned it hard way
1st UA-cam build I seen where the builder understands proper bracing. Nicely done.
Thanks for all your videos. I'm a newbie in the speaker build, but your videos give me a lot. Greetings from Slovakia.
I love these build videos! Tip: you can simulate box, analog/dsp filters and their effects on group delay with VituixCAD. It seems ported is pretty close to closed box after you have EQed it to equal FR curve. But there are other clear benefits for closed when you go below port tuning frequency 👍
Great video! I remember reading in Martin Collom's book that, in room, an f3 of around 40 hz. was good to shoot for due to typical room gain. Also, I must point out distortion increases directly with excursion...no matter what the distortion rating of a particular driver is.
Great video! I'm already running dual B&C 21SW152 in LLT but I'm wondering to utilize these large boxes for a second 21" B&C and make them sealed. I also agree on feeling such a pair of 21" woofers. They indeed deliver the visceral impact that dwarf most smaller subwoofer out there.
Super solid enclosure - nice job!
So awesome!
I love building speakers!
Nice build. I'm planning to build a 21" devastator to get that mid bass kick my 15's don't give. A lot of the tips you gave will be helpful to my build!
I had the same issue and just bought a cheap 12' subwoofer and made a 1ft³ enclosure with port at 65hz for it. Now I feel the kicks from 65hz to 110hz flat.
This little sub makes so much difference. Now even the old disco songs with lots of midbass sounds good in my sound system. Yesterday I seated in between the two subs and was amazing to feel the bass starting from the little sub in the left going to the big one to the right.
It's so satisfying to see and hear this project finished!
Love it!
Beasting that subwoofer around gives me Gene DellaSala vibes. Nice work! Bottomless bass, gotta have it.
That is seriously impressive low, LOW frequency output! What did your father say about it if he heard it? Man that's like having 1/3 of a standard door as a subwoofer. I had a multi-12" Titanic sub in an attic of very similar shape and the room was REALLY good at boosting the low end.
I can only imagine what two 21" subs feels like! What happens in the other rooms of the house when you're running bass sweeps? Anything fall off the shelf yet?
That's the video I was waiting for, for month's!
I’m so shocked this channel doesn’t have millions of subscribers. Awesome video and the subs look great.
Love this box. I usually use 3 quarter inch marine Plywood with a double baffter (so 1.5.inch), but will try this next time.
Great video , I have 2 of these 21 inch SBs , I haven't had the time to build cabinets, and niw I am motivated again .
Excellent. You make me want to build a wall of these
You got 2 subs and your boys got a new fort from the boxes. I certainly have sub envy now. Those things are crazy!
Fantastic build and result. Well done.
Placed a link on the asr forum.
THIS is the page I’ve been longing for.
Bag End used small sealed boxes with EQ since the 1980s, but in many cases the room is the right size to provide enough gain at low frequencies that very little EQ is needed. This is an interesting build video in concept. You could gain similar performance by using more smaller subwoofers in similar small sealed boxes, like doubling up on the 15" woofers instead of going to a 21", but the 21" is a way to skip right to the larger Sd instead of buying multiple small subs.
When soldering connectors, attach the two mating portions together; so if it does get soft from the heat, the opposite side of the connector keeps everything aligned until it cools back down.
simply, awesome
This is a fun experiment and I understand what you mean by feeling the energy. The car audio guys get the benefit of "room gain" far easier with nominal 12" subs even. As much as I am tempted to try this, having monuments in my media room would be cumbersome vs. just rolling with my 12" sub and the 4 butt kickers in my seating area. If I was pumping 30 Hz to the living room, it wouldn't take long for my wife to be knocking on the door. LOL I will want to try it though....
I learned a trick for t-nuts or hurricane nuts when I built a bandpass box a few years back. After you have you speaker cut out done and before you assemble the box, put the subs into the cut out and drill out the holes the same you did. Then install the t-nuts just like you did, but go ahead an drill a small hole in the t-nut flange so you can run a small screw through the t-nut and into the wood. It will not fail if you do this and you don't have to worry about it stripping out, no matter how many times you take your subs in and out.
That’s a great tip! I know some people also put a little bit of superglue when they seat it so that it doesn’t fail.
Awesome 👍
I'd be interested in a video where a previously made set of speakers is remade but with a more comprehensive wall material (say, laminated MDF/Synthetic Stone/Accoustic Pinboard, or some other such idea) and show a side by side comparison of the specs of the two.
I've been feeling the bass since 1992! I have a pair of Cerwin-Vega AT-100's (15" woofers) pushed by a DBX BX mark II amp. I'm finally redoing the surrounds as they've really gotten stiff over the years. I can't believe how unbelievably reliable they've been
im enjoying this sp2000 - c9 -a12t sound, sound great but still 'down to earth' and portable sound experience, which is good thing and suit the devices/synergy
Your room is shaped almost exactly like mine. Old attic turned into a computer room , in my case.
I have been contemplating going with a couple of 18 inch Dayton ultimax subs.
Great Video
I am attempting a similar sealed project with Bianco 18" 450W. This driver seems special. It has better low end extension. Initial sims show playing flat till 10Hz with max power and within 11mm xmax limits. 4.2cuft.(Qtc 0.88) looks to be perfect size without any power limit down to 10hz. Price is sweet too.
Excellent quality uploads.. Even in 240p 👌🏻
Yes, finally! 😁
This is the type of bass I like- body shaking!
thats it i'm building one of these for my office. 9' x 8' x 9' so totally not overkill at all
What is your room dimensions?
Room gain is dependent on longest dimension of the room.
Great build by the way.
SB Audience is available down here in Australia at reasonable prices.
Cheaper than Dayton…
You're talented. I wish I could do that stuff.
You can do it!
#12 x 1 - 3/4 inch screws with a 1/8 inch drill bit is an excellent alternative strategy for securing 18 and 21 inch drivers. I've done both with success...up to 50 lbs in driver weight.
I use 4x12" sealed DIY and can confirm that sealed + DSP (or infinite baffle if possible) is awesome. There is no replacement for displacement! My next will be at least 2x21-24". Great content here!
That is awesome! I ended up doing two 21s with Dsp and am very happy with it. It’s pretty amazing when you can start getting those big subwoofers to move air. I had a friend come over the other day who thinks me for turning on the bass shakers. I told him I didn’t have any bass shakers. And he was surprised. He said I got all that shaking from your subwoofers? It was pretty epic.
@@Toid it needs to be heard to be believed! After someone hears the transient response and the way this pressurize the room, no other acoustic type of enclosure could beat it :)
Awesome build, me wanty..
❤️❤️❤️❤️❤️❤️😀😀😀 no words !!!! I can see your excitement itself explains how incredible your build is 😀😀👍👍 what's the room size by the way? ..
I think from my limited experience the biggest drawback of a low tuning port (aside from excessive VB) is that its length greatly increases group delay. Sometimes sounding like muddy/boomy bass (I could be speaking somewhat inaccurately here though). That said I think that short ports for midbass applications are unbeatable.
These are some nice subs man ;D I have two 15" Ultimax in a 23"x20"x16" box but wish i would have made them more square-ish :D Have fun
yep...second box is usually easier to put together. I have most of my tolerances down for my machines but I have to tweak stuff constantly. I do some complicated builds and have lots of experience but still make mistakes.
Reminds me of an article in a 1969 edition of Hi-Fi News in which the author built his own then, unheard-of eighteen-inch subwoofer enclosure which doubled as a TV stand and was styled to match his Quad ELS speakers which are not known for their low bass output.
you definitely got a thum up. I see other videos where the buld boxes but not a single graph of frequency respond... 👏👏👏 great job... I was watching this other Vid where he shows how to gain even more dbs by frequency cancelation. not sure if it would apply since you have your sub side by side...his name is Michael curties. probably you know all that...
Interesting project. At the Moment i consider building an active Driven subwoofer enclosure With a Sandwich baffle filled with Quartz Sand. Since youve got a cnc this would also be an interesting project for you. Also its Not quit common these days but it heared some speakers in 2002 and always wanted To build one… actually two of These.
Unported 21" ... simply WOW!
This is an excellent design. The principle on which all woofer/enclosure systems can be analyzed is Newtons second law of motion applied to forced oscillation, the same way your cars suspension is designed.. The FR is controlled by 3 parameters, the mass of the moving part, the cone, voice coil, bobbin, the spring constant, and the damping factor. In this design, a quasi acoustic suspension design the stuffing plays an important role. The woofer is forced to push air back and forth between the fibers causing a frictional loss generating a tiny amount of heat related to velocity of the air. This is the same principle that causes the space shuttle to heat up when it reenters the earth's atmosphere at high speed. The spring constant is to a large extent controlled by the difference in air pressure inside and outside the enclosure. This eliminates all of the problems caused by ported designs. Because the air pressure is applied uniformly on the cone there are no differences in radial or circumferential force on different areas of the cone eliminating the twisting and shearing forces mostly mechanical suspensions create. At critical damping the response falls off at 12 dB per octave below system resonance which means you can extend FR below resonance with equalization.
The Crown amplifier was also an excellent choice. Gobs of power, extended LF FR, excellent reliability and customer support and a great value. Its what I would have chosen.
Worth having a look at Scott Manley's explanation of re-entry physics on the Tube (search Heat shields...).
I like to use a couple of #4 screws to hold the T-nuts in on the backside. The washer trick is fine for initial assembly, I use it too, but after some play time and needing to open things up to make repairs or changes, those t-nuts might not be so solid anymore, and it is almost always the last $$+-=€°| one that falls off. If you are lucky it just falls into the box. If you are not, it falls through the spider and leaves you with a driver to rebuild...
Great video! What‘s your verdict about one of these 21“ vs the two of them?
so odd, I thought you would have felt 20Hz and below pretty good with the ported ultimax build you did in that room :D I built a ported one using the 18" ultimax and OMG...even in a 24'x24' unfinished basement with block walls and concrete floor... it fills this room very very well!!
You could feel most of it. But it’s a different feeling. And there’s definitely some bass that you could hear before but now all the air in the room is energized making it a unique feeling.
I built a ported sub for the Dayton Ultimax 18" (about 8 cuft) and it did indeed get to 15Hz. However, in a 17ft square room it was impossible to DSP it to a reasonably flat repsonse. It was totally unmusical and boomed. I ended up selling it.
Nice I run a single mach 5 FTW 21 inch sub in the same size box off a Inuke 6000.
Very nice!
fwiw;
Un-check the auto ranging/formating...
Re-size your OmniMic window, for standardization, ie., when measuring LF, subs use 200hz as an upper limit, 45dB-105dB
Uncheck the auto formating...
This way you quickly develop visual references for vis-à-vis comparisons.
As always, keep up the good work.
Great video! Did you ever manage to perform some distortion tests on the 21" sealed subs? Also can you offer a quick word on choosing the ROSSO-21SW800 over the NERO-21SW1100D?
Man...I was going to build a couple of copy cat SVS PB16s (with an 18" driver) but this video makes me feel like I should build 2 sealed 21s instead...
I want these!!!
Brutal.
Nick, you have the coolest shop. I wish I had the room for a CNC.
Thank you. Now I just need to get the shop clean. 😂
Did you build your own CNC?
@@Techdiscussed no. It’s a CNC4Newbie
enjoyed the video. how would you say this box compares against the really large ported GSG diy builds? (ie. 20hz devastators) my room is about 24' x 16'
There’s nothing really wrong with either box design. One of them is going to be ported, which will limit your frequencies below the port tuning and for best power handling, you want to make sure to have a high pass on it. With something like the sealed the advantages are you don’t need a high pass and you’ll be able to get those subsonic frequencies. The disadvantage with the sealed is, it’s going to take more power to achieve the same SPL at lower frequencies, which mean the ported will have more overhead. Now the question that I was trying to answer was, do you have so much overhead that it’s unnecessary. Ie, you’ll never use the overhead.
Large Driver, Small Volume sealed subs are my Jam. They sound great, but require HUGE power as they are crazy inefficient. But with modern D Class Amps becoming affordable, they are totally the way to go.
Just a FYI for people looking for ballpark CEA-2010-A measurements, the B&C 21DS115-4 puts out the following in a vented configuration with the vent blocked. Though, there are a lot of differences in the ts parameters, so take this with a grain of salt.
10Hz: 97.2
12.5Hz: 108.5
15Hz: 114.7
20Hz: 113.5
25Hz: 115
31.5Hz: 119.3
40Hz: 125.3
50Hz: 128
63Hz: 129.6
80Hz 131.5
100Hz: 132.9
125Hz: 134
I assume these are in-room. 110 at 20 Hz anechoic is insane sealed.
@@TokeBoisen No, CEA-2010-A requires ground plane measurements outdoors without any nearby buildings/objects. Look at audioholics' subwoofer reviews for photos when they take measurements. The one large flaw with these measurements is the variable of weather/temperature that skews results.
@@fieldcar, yeah, I realised after, my mistake. I figured it must have been in-room due to the figures. The value of surface area I suppose.
@@TokeBoisen I know what you mean about the surface area. I just got the monolith THX 13, and it doesn't even come close below 15Hz. I guess I should have just mustered up the courage to DIY.
@@fieldcar Well, there are tradeoffs. To get those SPL figures from a sealed sub you need tons of power, and you'll need more DSP-shaping to achieve a flat response. The THX 13 is an incredible subwoofer for anything above infrasonic, and we don't like to admit it, but infrasonic content is not as prevalent as we can be led to believe.
For what it's worth, I've considered redoing my enclosures as ported to gain the output above 20 Hz, as well as the efficiency gains.
Great to see this. This isn't even a high excursion 21" (I'd have gone for a different driver personally). 21" is in my opinion the minimum you need to get good infrasonic and low group delay and avoid a million 18" subs. Far higher efficiency too. DIY subs are the only way to go if you want heaps of bass. You can't buy big 21"s or more usually.
But don't stick them all in tiny boxes. High excursion 21s need 1m3 or more to really do well sealed typically and you want to ensure they have a long enclosure. I'm making mine from Epoxy instead
Not to knock his experience but my only minor quibble was, if you have the room (he did) why squeeze that bad ass 21” in there? I realize it’s extra weight and probably requires some help to move around, but people buy couches all the time. Once installed though, you don’t need more people to get it just right if that’s required later.
I'm about to build some. I was going to make them 600x600 like this video but you are saying the bigger the box the better? If I make it bigger what would you suggest?
I have an old Cerwin Vega active 15" sub. It moves a LOT of air. I picked it up at a Salvation Army store, for $80. Had it serviced by my long term tech, he offered me $500, there and then. No deal.
Besides these wonderful Sealed Subs you built I have not seen you build any of the acoustic suspension design, mostly build ported speakers. I understand One has to build a ported design when they want to use high efficient drivers (If they want it to go much below 50Hz 3db down.) I was curious if you considered building a sealed speaker (front left and right application) using the 15" Dayton Audio DCS385-4 or similar? This Particular driver works well in a sealed enclosure I model it using WinISD at 33.5Hz 3db down in a 3.9 ft3 box its about a 90db efficient. I was going to pair it with an 8" Eminence Beta-8A for lower midrange and the Selenium D250-X for upper midrange using the H6512 6.5” x 12” Wave Guide. and for upper frequencies using the DS18 PRO-DKN25 1" Phenolic Horn Loaded Bullet Tweeter (This tweeter is supposed to have very good dispersion and sounds great I bought a couple and playing around with them and they sound awesome. Crossover points of 200Hz, 1.2kHz, and 4.5kHz. Only reason I am thinking on this 4 way is for maximum dispersion. Even if you decided on a three way design I would enjoy watching you build it or even another sealed speaker design. I know the 12" Aurum Cantus AC300/75C2C can go down to 48Hz 3db down in a more modest 2.1 ft3 box.
This looks great! When you model it in WinISD do you take into account the loss of volume from the bracing and the insulation or is it safe to ignore this?
You do. However, with this being a sealed subwoofer, you have a lot more liberties with the internal volume.
Amazing video!
I would like to do this but do not have so much space.
Can you recommend a driver for box dimensions 564 mm x 564 x 246mm ?
Greetings from Amsterdam!
You gotta see Steve Meade subwoofer he build for his home theater. It's huge!!
"that's enough talk, let's get cutting.." why does it seems familiar..like i've heard it sumwhere..? "enough talking, let's start eating" GUGA FOODS..!! haha..love your builds man..!! sincerely inspired by your work...will be joining you soon enough. gotta get that CNC machine & table saw 1st.
Nice subs for a pro audio style, personally I'd think a high excursion sub would be more impressive, and H.E. doesn't mean bad SQ either there's several 21 & 24 high excursion high BL subs that are tight and accurate. The sundown 24" is an impressive speaker but I don't know the acoustics of it wether it's tight or sloppy. A future project that would be cool is build an experimental concrete enclosure vs a wood and do audio tests. Apparently there's crazy priced high end concrete enclosures but there was a guy selling them very affordable because well there just concrete.... It should be a perfect enclosure audio wise there's obviously a bunch of caveats of it tho. But a basic form a bucket some gravel chicken wire and a few bags of cement and PVC pipe an afternoon and whalah concrete enclosure... Sand and epoxy and it could even actually look nice... Don't get me wrong this is a nice project that will shake your foundation I'm sure.
Great video! Interested in your thoughts on "dual-opposed" setups with "mechanical cancellation," like the KF92. They tend to be small boxes, and I assume similarly rely heavily on room gain and DSP. Bought two Dayton Audio 12" MX12-22 Max-X drivers over Black Friday, and thinking about building something like this.
One question would be, at high bass frequencies, do you start to get any phase cancellation issues? And corollary - if increasing box volume, should one keep the drivers as close as possible back-to-back, and increase in one of the other dimensions only?
@@dcuccia From a purely bass-response view, you'll probably be better off with two smaller single-driver boxes placed separately. You'll get more bass-extension because they don't have to share the enclosure-space, you'll need less power, you can use placement to cancel room modes and you can still make the single box smaller than what you'd probably do for a dual driver solution.
Wrt. opposing-drive designs, they don't experience cancellations, the drivers are placed close enough to for all practical purposes be co-located. Asymmetric designs like the Perlisten D215s or M&K X15+ can have some interesting effects due to one driver being located closer to the floor and relativele closer to any back- or side-walls, but for most people it's not relevant for room-integration purposes.
@@TokeBoisen thanks for the tips! Wasn't sure at what fraction of a wavelength cancellations start to happen, but it sounds like it's not a concern, especially for lateral-firing woofer designs. Two boxes in my case may be more of a hassle, as I have an oval table design in mind, but will be sure to give them enough power and space.
Nice cab bracing btw..
What's your thought about increasing cabinet dimension? For example, what would be the effect of keeping same foot print (depth + width) but adding some extra height to cabinet?
Would there be a benefit or tradeoff to that extra internal volume, in this specific 21" sub application? For example, what if 1 or 1/2 cf was added as height?
As he discussed, more volume will give a lower Qts, lower F3, and diminished power handling. He didn’t like the trade offs since with the combination of room gain and DSP it was flat to 10 Hz, anyway.
I look at the power handling a little differently. The lower enclosure F3 will allow less DSP adjustment, and require less power to reach the same equalized SPL, so the slightly diminished power handling still gives at least as much overall flat SPL. Whether the increased materials and more required space is worth it is up to you.
Myself, I would have used an 18” Ultimax in the same size cabinet. This gives you a starting Qts of 0.8 and F3 of 26 Hz, so almost no equalization is necessary. Of course, the 21” will move more air and has a higher SPL, but with a slightly less natural sound with the increased DSP adjustment. Horses for courses.
Congratulations, fantastic results. My I ask why you didn't choose the SB Audience NERO-21SW1100D?
Is the subs also for music, not just movies?
This is going in my theater room, so it’s mainly going to be used for movies, but it sounds good for music as well. As far as why I didn’t use the Nero, it’s sealed output was not as good as the sealed output on this. This one just worked better for this design.
Wow
My Monoliths already take up a ton of room...... Hind sight I guess.
Looks very impressive
Have you tested Rockville amps? Would be interested to see how they compare to crown!!!
Question: Can you tell a CNC machine to cut a groove into the wood and if so, how? I know how to use CAD and revit for design. But If it's possible, I don't know how you would be able to tell the machine how deep to to cut this if you're feeding it a .dwg file, because it just reads a 2D CAD file, right?
If you ran 2 of these in 1 sealed box, would it work better running the drivers with 1 in phase and the other out?
Seems if both push at the same time it would be fighting each other
Now I got to know. How do these sound with music?
Wonder what those drivers would do in a folded horn cabinet?
8:42 I would love to hear that on an ADMARK AD42 or CVR-D 3302
Hi - any reason why you didnt use the dayton 21“ kraken ? Wann build one too but not sure which subwoofer to choose thanks
Something hardly anyone does is it is a good idea to put some glue on the T nut, they are notorious for not staying seated and then everything spins causing a real bad time, then it's try n unscrew with sub facing down to keep tension on the nut. Just a blob of e6000 ontop or under it whatever.
Would the Nero 1100 watt version work the same in the same exact box you used or do the T/S parameters differ too much ? I want to put 1 of these in my car.
Are you running the two subs in bridged mono? Do you have 1+/2+ connection on channel 1 at the amp and 1+/1- connection at the subs?
what are your thoughts on the crown xls 2002 vs xti 2002?
Have you ever considered making a set of speakers with violin holes beside the woofers?
Hey man, little late to this vid. Have interest in building my own speaker stack. For subwoofers, would these be the same as a “car subwoofer” you can buy? I wanna build my own cabinets. Kind of like a DIY loudspeaker setup for mini concerts, or is there a specific kind of woofer that is different from the “car” ones.
Some people go through hoops and lots of effort into making a box that is strong with lots of bracing so the walls don’t flex but in the end, all that work can be saved just by putting the subwoofer in a tube. Tube’s natural round shape cannot flex thus not needing all that unnecessary bracing and extra weight. Just put a thick front and rear baffle and you’re good to go!
On a side note, locating an 18” or 21” tube is a little hard. Although there are huge pvc water tubes that can be used.
Bro u the og?
@@vishaalgargi
Yes
@@Bassotronics cool, brother i hope one day, i will have a system capable enough to play the bass i love u track so that i can finally experience it for myself.
Great vid. So many comments, so little time.... How would you rate these small sealed boxes to a UM18 or the HTS544t, since you tried them all. Lets say its for ht 50/50 movies amd musk
I would be interested too, since I'm inbetween 3 or more choices, the Dayton UM18 as closed box and more.
Nice seems loud 🔊
Is there any less expensive 21” sub you think you could have achieved similar results with? Love you videos!
If you look at Parts Express (where he usually gets his stuff), all the 21” drivers have low Q and high Fs, so do not have the capability to reach a sub 40 Hz (or even 60 Hz!) F3 in a sealed enclosure. They will slam you against a wall in mid-bass, but do not dig deep, at least not without equalization.
I think the 18” Ultimax is a good compromise; it is half an octave lower than his 21”, but does not compete for total SPL. Most people will find 116 dB @ 26 Hz (not including room gain!) more than adequate.
Have you connected your crown xti 2002 amp in bridged mode to run these subs?
I built one of these with a Dayton kraken 21inch sub and a crown xti2002. However its rolling off a 40 hz. I used anthem avm70 processor to do the dsp. Maybe i need to do dsp in the crown amp ? Or is it just because im using it as a nearfeild sub ?
I was thinking about making a bigger box.
Great work on the enclosures and video. Do you think you would get close to the same results with just 1?
Interestingly I had this in the video at first, then edited it out. But I did test this first with just one, so it would be a fair comparison versus a single 15. And yes, there was a very noticeable difference.
Simple; it's 6dB less.
6dB is subjectively a big increase.
Plus halve the compression, and halve the distortion at any given operating level.
I bet you can get more content out of those subs, I would love to see reactions of people, maybe set a cup of water near them to visualize the POWER! ;)
crazy