New to the game, a few quick questions.

[hsv2kk]

Hi,

I am in the middle of designing a dual 12" coffee table sub, and I am in the midst of selecting an amplifier.

The Behringer Europower 1500 looks like a solid enough amp for my needs.

What else is required to make sure this amp does not play full range through the subwoofers? The Behringer will be hooked up to my HT via the subwoofer out.

Thanks!

[Mike P.]

Your reciever will have a crossover built in for the sub frequencies. Depending on the design of the dual 12" coffee table sub you may need a subsonic filter.

[hsv2kk]

Hi Mike,

Thanks for the quick reply!

I have a Highpass Linkwitz-Riley filter 4th order 18hz cutoff modeled in WinISD to control excursion. Will this do the job of the subsonic filter?

[Mike P.]

hsv2kk wrote:

Hi Mike,

Thanks for the quick reply!

I have a Highpass Linkwitz-Riley filter 4th order 18hz cutoff modeled in WinISD to control excursion. Will this do the job of the subsonic filter?

Yes, that would do it.

[hsv2kk]

Excellent! Thanks again.

[Mike P.]

Which 12 inch subs are you thinking of using?

[hsv2kk]

I have 2 car audio subwoofers from my old boot install that I will be using.
They are Alpine Type-R's. Model 1221D.

Both are dual 2ohm subwoofers, so one sub per channel on the amp with each sub showing a 4ohm load.

Not ideal, but they work pretty nicely in WinISD in the 7-8 cu^ft enclosure tuned @ 20hz.

Specs:

Qts: 0.382
Qms: 8.680
Vas: 58L
Qes: 0.400
Fs: 27Hz
SPL: 86.59dB
Xmax: 13.3mm
Xdamage: 27.5mm
Sd: 0.0467 m^2

Thanks for showing interest.
Any advice would be greatly appreciated, as this is a first build for me.

[Mike P.]

They model surprisingly well in 7 cubic feet tuned to 20hz. Good luck with your build. Post some pics if you can!

[Warmon]

I have also heard that these Alpine Type R's make very decent home subs. Good luck with your build and I too will look forward to the pics.

[funky_waves]

A reckhorn B-1 is perfect for that aplication, it gives you, variable subsonic, variable highpass and variable boost. And its not expensive or very big.

[hsv2kk]

Nathan,

Do you have a 240v B1 that you could ship to Australia?

[hsv2kk]

Has anyone seen, or used glass or plexiglass on there installs?

I would love to have the bottom of the coffee table glass black with a timber top with a glass window set inside of it, to see inside of the enclosure.

Any ideas on what thickness glass would be required, etc?

Thanks guys!

[Owen Bartley]

I think you'd want pretty thick plexiglass, and wouldn't want to make the window very big, since it is a pretty flexible material, and you won't be able to brace the enclosure where you put your window. You'd also want to make sure it is very tightly sealed so you don't get any air leakage around it. I'm not sure if you could use multiple layers of thinner plexi, but I suppose that could work.

[Mike P.]

I saw a pic of a Decware sub that had a plexiglass top. I beleive it was 3/4 inch thick plexiglass.