Have you seen these Blaupunkt models?
Powered Subwoofers at Crutchfield.com
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CrutchfieldBlaupunkt's compact THb 200A amplified subwoofer mounts just about anywhere, so you can add great-sounding bass to your vehicle without giving up precious trunk space. The slim, die-cast aluminum cabinet contains a 70-watt RMS amplifier and an 8" subwoofer for clean, low-frequency reproduction that enhances any style of music.
You don't have to worry about turning the sub on and off — just feed it some music and it'll respond, and it shuts off one minute after the tunes stop. Preamp- and speaker-level inputs provide easy connection to nearly any stereo system, and this handy little thumper comes with all the wiring and mounting accessories you'll need for installation.
Details:
compact powered subwoofer
8" woofer with polypropylene cone
70 watts RMS amplifier (peak power: 140 watts)
variable low-pass filter (40-120 Hz)
phase switch control (0-180°)
frequency response: 30-120 Hz
preamp- and speaker-level inputs
9.8' power cable included
dimensions: 14"W x 3-3/8"H x 8-15/16"D
warranty: 1 year
I am considering a new head unit, door speakers, rear shelf speakers, and this subwoofer.
The head unit powering the doors and rear shelf speakers, cutting everything below about 120 hz or so. Utilize the subwoofer, cutting out everything below 30 hz.
Should be pretty solid in the little bitty cabin of a B13. I am also using a bunch (I bought 200 sq ft) of Elemental Designs best sound deadening stuff. Between the sound deadening and my "audio system" design, I should be able to get plenty of volume inside the vehicle. I have no interests in a sound system you can hear and feel from two lanes away. Just reasonably loud, crystal clear, and with some decent bottom end.
On the other hand, I wonder if two (2) eighteen-inch subwoofers would fit in my trunk?