I wonder if anyone ever used one of these in a diy subwoofer

[ImcLoud]

400lbs of subwoofer, lol... I'm thinking 2 of these and 2 Powersoft K10's, that will be 24000 watts, should be good for a 20x25 room with 11ft ceilings subs are $10 K each amps are $4k ea enclosures will be $1500iish, so for under $30K you can have one of the most powerfull ht sub sets in the world..

https://www.youtube.com/watch?v=7OXHZmHP9X8
JackHammer 24" Dual 2© 4000W RMS SuperWoofer

 

[shadyJ]

Just for laughs I inputted that driver's parameters in winISD, here is what I got for the recommended sealed enclosure of 5.47 ft^3 at its 4 kW RMS input level for 2 m:

10 Hz: 106.25 dB
12.5 Hz: 110.18 dB
16 Hz: 114.54 dB
20 Hz: 118.47 dB
25 Hz: 122.31 dB
31.5 Hz: 125.92 dB
40 Hz: 128.89 dB
50 Hz: 130.49 dB
63 Hz: 131.16 dB
80 Hz: 131.3 dB
100 Hz: 131.27 dB
125 Hz: 131.2 dB

 

[ImcLoud]

So its only around 8db louder than a vtf15H at 80 hz, lol so is that 5 times louder?

 

[shadyJ]

VTF15h at 80 Hz is 115 dB, the MTX is 131 (if that sim is to be believed), a 16 dB difference, which equates to a bit over six times as loud, in amplitude. You would need six VTF15hs to equal one MTX Jackhammer at 80 Hz, according to that sim.

You would probably want to keep your thumb drives and cellphones away from that MTX sub.

 

[ImcLoud]

I was just looking at the chart on the hsu website it said 123.8 at 80 hz.. I want one of them subs... $2800 on ebay if you are in california http://www.ebay.com/itm/MTX-JackHammer-T9922-44-1-Way-22-Car-Subwoofer-/221338469750?pt=Car_Subwoofers_Enclosures&hash=item3388cd0576

 

[shadyJ]

I was using data-bass numbers for the VTF15h, and I put the sim numbers for the MTX at 2 m for a match. To get the MTX winISD numbers to match Hsu's numbers, just add 6 dB.

I definitely would not want one of those Jackhammers. I doubt they are built with linearity and low distortion in mind. It's an SPL competition stunt. What it does well is crank out a lot of sound from a relatively small enclosure, a 5.5 cubic foot box. There are ways of doing that which don't weight 400 lbs. A lot of that probably has to be shielding for its 56 lbs magnet. There are a lot saner ways of getting huge output from a small container, the PSA Triax for instance, or the JTR S2, either of which may approach the MTX in sheer output.

 

[Adam]

I bet no one has put one into a DIY, but if anyone here will, it'll be Fuzz.

We are talking about the basketball, right?

 

[ImcLoud]

I just want to eat cereal out of that sub, capt crunch with almond milk... and then instead of having to clean a bowl, you can just power it up and vawallah, clean...

 

[shadyJ]

You could blow dry your hair with it as well.

 

[lsiberian]

I've never associated MTX with sound quality no way am I spending 3k to have my association proven right.

 

[fuzz092888]

I bet no one has put one into a DIY, but if anyone here will, it'll be Fuzz.

We are talking about the basketball, right?

You rang?

 

[ImcLoud]

I've never associated MTX with sound quality no way am I spending 3k to have my association proven right.

ARE YOU SERIOUS? these are the only speakers in the world that sound better than the b&W CM5 MTX Monitor 600i Dual 6-1/2" 2-Way Tower Speaker | 302-016

 

[Pyrrho]

400lbs of subwoofer, lol... I'm thinking 2 of these and 2 Powersoft K10's, that will be 24000 watts, should be good for a 20x25 room with 11ft ceilings subs are $10 K each amps are $4k ea enclosures will be $1500iish, so for under $30K you can have one of the most powerfull ht sub sets in the world..

https://www.youtube.com/watch?v=7OXHZmHP9X8
JackHammer 24" Dual 2© 4000W RMS SuperWoofer

You've got the wrong picture; the 400 pound model is square. The right one is pictured at your link:

JackHammer 24" Dual 2© 4000W RMS SuperWoofer

As for your $30k estimate, I cannot help but wonder how many SVS PC13-Ultras I could get for that price. I know that at full retail price I could get 17 of them, with more than $1000 left over, but if I offered to buy them all at once, they may give me a deal and maybe I could get more of them.

But really, I would have to be incredibly rich to want to blow that much on subwoofers. I am quite happy with my pair of old SVS CS-Ultra subwoofers (with the little 12" subwoofers), and do not plan on ever upgrading them.

 

[shadyJ]

As for your $30k estimate, I cannot help but wonder how many SVS PC13-Ultras I could get for that price. I know that at full retail price I could get 17 of them, with more than $1000 left over, but if I offered to buy them all at once, they may give me a deal and maybe I could get more of them.

The thing to do at that point is get sealed subs, not ported ones. You will have long past all the output you will ever need above the tuning points of ported subs, and after that its time to chase the extreme deep bass. You could get 20 SVS SB13s or 30 Hsu ULS-15s or 10 Funk 18.0s for $30k, and that will get you monster deep bass well into the single digit frequencies.

 

[Pyrrho]

The thing to do at that point is get sealed subs, not ported ones. You will have long past all the output you will ever need above the tuning points of ported subs, and after that its time to chase the extreme deep bass. You could get 20 SVS SB13s or 30 Hsu ULS-15s or 10 Funk 18.0s for $30k, and that will get you monster deep bass well into the single digit frequencies.

The SVS PC13-Ultra has variable tuning, including a sealed mode:

PC13-Ultra

But yes, your point is well taken, as there are limits to the volume needed, so after a certain point, the main improvement will be in greater depth of bass, not increased volume capacity at the upper end of a subwoofer's output.

 

[ImcLoud]

c'mon, It was torture asking my wife to put two vtf2's in the living room, never mind 20 ultras, plus you would need a lot of powerstrips, lol..... Two of these would only need a couple of large enclosures vs 20 large enclosures.... This would obviously never happen since, my house would shake apart at the seems, its bad enough by dual vtf2's crack my ceiling when I turn them way up {cathedral ceilings done by a guy that specializes in large ceilings, they used 58"X14" 5/8" boards!!! I have contracted houses before and NEVER seen larger than 4x12 sheets, these were enormous and HEAVY, they used special screws and blah blah blah spared no expense with the house, Steel and engineered beams, 2x8, 2x6 and SIPS construction, ecte ect ect And my $600 subwoofers crack my ceiling... I know with a large house in our area cracks and settling is going to happen, but I wish they cracked at eye level so I didn't need a ladder to fix them, not 22 feet up..

 

[Adam]

ARE YOU SERIOUS? these are the only speakers in the world that sound better than the b&W CM5 MTX Monitor 600i Dual 6-1/2" 2-Way Tower Speaker | 302-016

Dude, I was laughing my a** off when I read that this morning. I can't believe that you haven't gotten more thanks.

 

[ImcLoud]

LOL, I knew you would catch it, I figured Fuzz and a few others too but they let me down...

 

[Pyrrho]

c'mon, It was torture asking my wife to put two vtf2's in the living room, never mind 20 ultras, plus you would need a lot of powerstrips, lol..... Two of these would only need a couple of large enclosures vs 20 large enclosures.... This would obviously never happen since, my house would shake apart at the seems, its bad enough by dual vtf2's crack my ceiling when I turn them way up {cathedral ceilings done by a guy that specializes in large ceilings, they used 58"X14" 5/8" boards!!! I have contracted houses before and NEVER seen larger than 4x12 sheets, these were enormous and HEAVY, they used special screws and blah blah blah spared no expense with the house, Steel and engineered beams, 2x8, 2x6 and SIPS construction, ecte ect ect And my $600 subwoofers crack my ceiling... I know with a large house in our area cracks and settling is going to happen, but I wish they cracked at eye level so I didn't need a ladder to fix them, not 22 feet up..

Someone who can afford blowing $30k on subwoofers can afford a dedicated home theater room, and will not need to worry about subwoofers affecting the decor of the living room. I only have a couple of thousand worth of subwoofers, and I have my home theater in a different room from my living room. I highly recommend using a room other than the living room, if possible. A repurposed bedroom or a room in the basement can make everyone happy.

In my living room, I have just a two channel stereo, and no TV at all. However, my wife is less than thrilled with the appearance of the speakers used there:



(That is obviously a promotional picture, but mine are that exact finish.)

But she really likes the way they sound, so she is okay with them there. And I agree with her, that the speakers we had before were more attractive (though less interesting looking, because they were more normal looking). Here is basically what my previous speakers looked like (though the picture is an inferior version of the model):




Those have the best fit and finish of any speaker not only of any that I have ever owned, but of any I have ever seen as well.

Anyway, put your home theater system in another room if you can, and then your wife will likely be okay with you doing anything with it you want, provided you can afford it.

 

[shadyJ]

The SVS PC13-Ultra has variable tuning, including a sealed mode:

PC13-Ultra

The PB13 Ultra doesn't seem to like sealed mode too much. The sealed mode VTF15h is running almost neck to neck against the sealed PB13. The Funk 18.0 crushes them both in their sealed modes, and the 18.0se is only $500 more than the PB13. If you want to see something amazing, check out the THD sweeps on the 18.0 on the 120v tests, particularly the 115 dB sweep. It stays under 10% almost the entire sweep, just barely nipping it at 11 Hz, and it doesn't even crack 10% at all in the 240v and passive 115 dB sweeps. No other commercial sub plays deep bass that cleanly, and only a couple of the more extreme DIYs can get match that. The VTF15h and PB13 don't even begin to compare in their sealed modes, their THD skyrockets under 30 Hz, but you can't really blame them since they are meant for ported enclosures. For clean ultra deep bass, the Funk is the sub to get.