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Discussion Starter #1 (Edited)
I am finally getting around to serious planning for my subwoofer installation.

I have a 2004 Subaru Outback Wagon. The plan is to move the full size spare to a swing out carrier on the back and utilize the large spare tire well for a subwoofer and amplifier. My goal is to have solid bass down to 20 hz that I can turn up loud on occasion while keeping decent SQ. (SQ is sacrificed in many areas of this project due to budget constraints)

The current amplifier I am considering is a Cadence F-100-5 that can output 100 rms x 4 at 4 ohms plus either 300 rms x 1 at 4 ohms or 500 rms x 1 at 2 ohms. It is a class A/B amp and I do understand what that entails as far as heat etc. I plan to use line level inputs from my stock radio and this amplifier is definitely within my budget. One down side is that it is a bit large but I can hide it easily in the spare tire well.

The door speakers are Polk DB651 coaxials.

I am approximating that the spare tire well could hold a box with a maximum volume of 5 cubic feet although it certainly does not need to be that large and I would like extra space around the amplifier to keep it cool. I would also prefer to keep it sealed for simplicity. I am also interested in input on how to let sound/air out as there will be a false floor over the entire enclosure that must be tough enough for dogs, firewood, junk, etc. Haha It's a wagon and I do sometimes use it like a truck! I was thinking about using a piece of wood for the false floor and a strong wire mesh over the speaker opening and then carpet over the whole thing.

On to the sub driver. I'd prefer a 12" but could do a 10", dual 10", dual 12", etc. if it is ideal on the budget, box size, sound, and amplifier. My current budget for the driver is $125 max shipped unless I can sell this 800W pure sine inverter I have sitting around (any takers? lol)

I have narrowed it down to these, assuming one 12" driver:

EF-120 - CDT Audio 12"
Sensitivity 87.6 db
Frequency Response 10-400 hz
Nominal Impedance 4 ohms
Voice Coil Diameter 1.97"
Peak Xmax 14 mm
Magnet Weight:
300 WRMS (600W Pk)
Free Air Resonance: 30 Hz
Voice Coil DC Resistance: 3.96 Ohms
Voice Coil Inductance @ 1 kHz: 1.9 mH
Mechanical Q (Qms): 4.8
Electrical Q (Qes): 0.63
Total Q (Qts): 0.56
Compliance Volume (Vas): 70 l; 2.47 ft3
Moving mass, Diaphragm:147 Gr
Motor Force Factor: 13.2 Tm

CTX124 - Image Dynamics 12"
Impedence: 4-Ohm
Power: 50-350 Watts RMS
Sensitivity: 86dB
Frequency Response: 16Hz - 180Hz
Xmax= 16.00 mm
Vas= 131.7607E-3 M
Fo= 22.5622 Hz
Qts= 0.5302
SPLo= 85.6980 dB

Pioneer TS-W309D4 12" Champion Series DVC Subwoofer (run as 2 ohm)
Power handling: 400 watts RMS/1,400 watts max
Impedance: Dual 4 ohms
Re: Dual 3.2 ohms
Le: 3.76 mH (8 ohm)/1.30 mH (2 ohm)
Frequency response: 20-180 Hz
Fs: 34.5 Hz
Sensitivity: 92 dB 1W/1m
Vas: 1.22 cu. ft.
Qts: 0.62
Xmax: 10.3 mm

I'm having difficulties getting a box modeler to work at the moment. (on a Mac) I'm also concerned that the Pioneer's 3.2 ohm/coil rating may not be healthy for the amp I'm considering.

I am curious to hear your opinions so don't be afraid to shoot me down just explain why. Also please remember I'm on a pretty tight budget!

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