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Pi subwoofer kits [message #60361] Thu, 09 July 2009 16:08 Go to next message
Russellc is currently offline  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
Re: Pi subwoofer kits [message #60368 is a reply to message #60361] Thu, 09 July 2009 19:52 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18783
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.


Re: Pi subwoofer kits [message #60377 is a reply to message #60368] Fri, 10 July 2009 11:28 Go to previous messageGo to next message
Russellc is currently offline  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.
Re: Pi subwoofer kits [message #60380 is a reply to message #60377] Fri, 10 July 2009 16:07 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18783
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.
Re: Pi subwoofer kits [message #60391 is a reply to message #60380] Mon, 13 July 2009 12:41 Go to previous messageGo to next message
Russellc is currently offline  Russellc
Messages: 397
Registered: May 2009
Illuminati (1st Degree)
Thanks Wayne much appreciated!

Russellc
Re: Pi subwoofer kits [message #60393 is a reply to message #60361] Mon, 13 July 2009 19:20 Go to previous messageGo to next message
Psychoacoustic is currently offline  Psychoacoustic
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Registered: May 2009
Viscount
What drivers are available/recommended for use in Pi3?
Russell, what are you thinking of using?
Re: Pi subwoofer kits [message #60396 is a reply to message #60393] Mon, 13 July 2009 20:41 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18783
Registered: January 2001
Illuminati (33rd Degree)

We sell an OEM PI-12 driver that's essentially a LAB12 with a machined pole piece. You can also use a stock LAB12.
Re: Pi subwoofer kits [message #60401 is a reply to message #60361] Wed, 15 July 2009 20:23 Go to previous messageGo to next message
Psychoacoustic is currently offline  Psychoacoustic
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LAB12- thanks. OK, so no insulation or bracing required- correct? Looks like a quick build. Will use ply.
Re: Pi subwoofer kits [message #60402 is a reply to message #60401] Wed, 15 July 2009 22:59 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18783
Registered: January 2001
Illuminati (33rd Degree)
It can't hurt to cross-brace, we do. But no insulation is required. Just a box and woofer.
Re: Pi subwoofer kits [message #60412 is a reply to message #60361] Thu, 16 July 2009 18:30 Go to previous message
Psychoacoustic is currently offline  Psychoacoustic
Messages: 75
Registered: May 2009
Viscount
Great. Will cut my first window brace.
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