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Pi subwoofer kits [message #60361]

Thu, 09 July 2009 16:08

Russellc
Messages: 397
Registered: May 2009

Illuminati (1st Degree)

Wayne, what is the deal with these kits? (3 pi subwoof) What comes with it, (what driver) and can I obtain box plans to cathouse7 at SBCglobal dot net please. Looks very interesting!

thanks in advance!

Russellc

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Re: Pi subwoofer kits [message #60368 is a reply to message #60361]

Thu, 09 July 2009 19:52

Wayne Parham
Messages: 18786
Registered: January 2001

Illuminati (33rd Degree)

I'll send you the plans.

It's a pretty simple speaker - just a woofer in a vented cabinet, tuned to give strong output to 20Hz. The cabinet is 3.6ft³ tuned to 22Hz, yielding f3=22Hz and f10=18Hz.

http://www.pispeakers.com/threePi_subwoofer.jpg

three π subwoofer

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Re: Pi subwoofer kits [message #60377 is a reply to message #60368]

Fri, 10 July 2009 11:28

Russellc
Messages: 397
Registered: May 2009

Illuminati (1st Degree)

What is the sensitivity of those subs compared to JBL 15" woofers like the 2225? I expect you will need to double the number of subs to match.

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Re: Pi subwoofer kits [message #60380 is a reply to message #60377]

Fri, 10 July 2009 16:07

Wayne Parham
Messages: 18786
Registered: January 2001

Illuminati (33rd Degree)

Freespace sensitivity is 89dB. If you just use a pair of subs, you'll need about 10dB gain in the amp stage to match the stereo mains. If you use four subs, you won't need as much gain and you'll also get better smoothing from multiple bass sound sources.