A little help for a noob - subwoofer

[mach1]

Hi everyone,

I've been lurking for a while, but finally decided to try this. I have an Image Dynamics dual 2ohm 12" car sub that's been sitting around for a while.

The specs are here:

http://www.imagedynamicsusa.com/pdf/iDQ12%20D2%20V2.pdf

The spec sheet specifies enclosure sizes for use in a car, so I'm not sure if it would be a lot of help.

I was wondering if someone could help me with a design for a box... This will be for a HT setup.

As for a plate amp, I was thinking about one of the Dayton amps, maybe the SA240... any thoughts?

[mach1]

I should add that I would prefer to build a sealed enclosure, but am open to suggestions..

[brent_s]

It's definitely a car oriented driver...early rolloff, small box requirements. Should be ok for a small to moderate sized room or with modest output requirements. ID's Sd seems a bit optimistic compared to other 12" drivers which will inflate output simulations relative to other 12" drivers with similar Xmax. One has to wonder if other parameters were treated similarly like is Xmax really Xsus or is Fs really that low.

Using WinISD Pro Alpha:

Sealed 1 ft^3, Q= .646, f3=55hz, f10=30hz, f16=20hz. 500 watts with coils in series will get you 98dB@20hz, 105dB@30hz, 111@50hz...1m ground plane.

2.5 ft^3 tuned to 20hz. f3=40hz, f10=17.5hz. 500 watts with coils in series yields 107dB@20hz, 111@30hz, 112@50...1m ground plane. You'll probably want a 4" port to avoid port noise if you plan on pushing it hard, which is a problem. You'll need to squeeze a 4"x31" port into that 2.5 ft^3 cabinet to tune to 20hz. You don't mention costs...one of AESpeakers PR15-1050s should do the same for $65.

Subtract roughly 3dB from output numbers for the SA240.

-Brent

[mach1]

Thanks a lot for helping me out! I'll have a look at AESpeakers