Best design for RockfordFosgate P2D2-8 Punch 2ohm DVC - AVS Forum
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post #1 of 2 Old 12-08-2012, 07:47 PM - Thread Starter
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Hi all, I want to build a relatively small sub for my car. I will be using the stock amp which is a 2channel 2ohm 25watt amp. So I would like the most efficient design I can make with this RF 8" subwoofer.Here are the specs for the driver. Any help would be appreciated.

Compliant:Size:8"
Nominal Impedance:Dual 2-OhmPower Handling (Watts RMS):250 Watts RMS500 Watts MaxVoice Coil Diameter:2.25"(57.7 mm)
Magnet Weight (oz):49 oz.1.38 kg.Speaker Connector:Dual 10 AWG compression
Fs (Hz):39.6Re 
(Ohms):3.40Le 
(mH):2.9Q
ms:5.40
Qes:0.51
Qts:0.46
Vas (Liters):9.9Sd
 (cm2):221
SPL (dB @ 1w/1m):83
Xmax (mm):7.8
Woofer Displacement(in):0.071 cu. ft.(2.0 Liters)
Cutout Diameter (in):7.13 in.(181 mm)
Mounting Depth (in):4.76 in.(120.8 mm)

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post #2 of 2 Old 12-08-2012, 08:31 PM
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Not the best driver for a 50 watt amp, being very low sensitivity. I would go with a ported box, 0.5 ft3 internal volume with a 2" x 15" port (32hz). A 12" x 12.5" x 8.5" box built out of 1/2" wood (1/2" ply works well) will get you there. You can use something like this PVC elbow to make the port length fit

http://www.lowes.com/ProductDisplay?partNumber=23360-1814-PVC+00304++0800&langId=-1&storeId=10151&productId=3132789&catalogId=10051&cmRelshp=req&rel=nofollow&cId=PDIO1

Here's the free air response, in cab should get a large gain down low.

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