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I'm going to use this driver for a powered sub project: Any thoughts?

sealy

sealy

Addicted Member
JBL P1022. Got it at an auction for $15. One of the tinsels was broken, but I fixed it. Dual voice-coil. 2 ohm impedance, but I'll run the two coils in series for a 4 ohm load. This 10 in. woofer weighs 29 lbs. 96db/watt efficiency. I'm going to run it on a BASH amp of 300 watts rms output into 4 ohms. Of course, this driver was intended for use as a car sub, but I've already had great success using car woofers as home subs. Apparently, recommended box size for a sealed enclosure is a mere .75 cu. ft.? I gather woofer excursion capabilities help with bass response in such a small box. I'll be crossing the woofer over at approximately 50 hz.

Any and all comments would be appreciated.
 
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Well, always remember that car subs are engineered for bass reinforcement of a car interior, which is an entire magnitude greater than that available in the average listening room. That said, it all comes down to T/S parameters I suppose. Fs and Qts to start with would be my first questions, especially relative to a box that small.
 
Agreed. I was wondering about bass response in a typical listening room. Fs is 29hz. Qts is .55. The size of an average listening room has to be around 2,000 cu. ft., which is a hell of a lot larger than the cubic footage of an average car. Most probably, the enclosure size should be at least triple that of the suggested size for use in a car. Perhaps around 2.5 cu. ft? I don't have access to the kind of computer program that would enable me to compute the necessary enclosure size. I do know that the box size recommended for the other car subs I made was 2 cu. ft. That size worked perfectly in my large listening room. The bass really energized the room.
 
I've just put the JBL through its paces, temporarily ensconced in a 2 cu. ft. box. 96 db sensitivity notwithstanding, with an application of 50 watts, it's hardly awake. I would estimate that it really starts going with 100 or so watts input. There are signs, however of a deep rumbling that I have not previously heard from any subwoofer save the big Velodynes and the M and K isobaric. Can't wait to get started.
 
Speedle looks like a nice friendly person from his picture.

I was goona suggest a bigger enclosure but Sealy already tried it.
 
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