Please sanity check my ideas for a 281 variant with Vifa PL22s. - diyAudio
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Old 31st March 2004, 10:43 PM   #1
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Location: Maryland
Default Please sanity check my ideas for a 281 variant with Vifa PL22s.

I am trying to locate a set of plans for a pair of HT mains that would work nicely with the Vifa PL22 8" woofers I have.

I have looked around quite a bit and the best I can come up with is to use a variation of the Kit 281 enclosure since the PL22 specs appear to my inexperienced eyes to be very close to the AV8:

AV8 PL22-04
Fs 35.8 27
Vas 56 56
Qts 0.39 0.34
Qes 0.43 0.37
Qms 5.65 5.91
Xmax 5.6 mm 4mm
EBP 83.3
SPL 89.3 dB 86db
BL 9.06 N/A 10.9
Le 1.15 mH 2.7mH
Re 5.48 ohms 3.2

The inportant differences is that the vifa goes a little lower, and it's 4 ohm vs 8 ohm and the AV8 has a somewhat flatter response, especially between 1-2khz.

I am thinking of using two of these drivers in a smaller version of the 281 sealed enclosure: about 23l vs. 27 from the 281 plans. This gives me a F3 of about 60Hz which seems fine for HT use. I also like the simplicity of a sealed design because there are fewer variables to get wrong.

Does this seem reasonable? Am I missing something here? Any suggestions for tweeters that will integrate well with minimal fussing with the crossover.

I would also greatly appreciate a helping hand with the crossover design, especially how one handles two 4 ohm woofers....

Thanks in advance

Philip
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Old 1st April 2004, 08:21 AM   #2
sreten is offline sreten  United Kingdom
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two 4 ohm drivers in parallel will cripple your amplifier,

sreten.
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Old 1st April 2004, 09:53 AM   #3
sreten is offline sreten  United Kingdom
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I've also checked out the PL22-04.

Sensisitivity is low for a 4 ohm unit, but linear throw is good.

Its a pure bass unit, entirely unsuitable for midrange use.

They would be excellent for the subwoofer, or 5 small sealed
box AV speakers with left and right with stereo subwoofers.

Used in series they would also be in the right ballpark for some
3-way louspeaker designs, instead of a 8 ohm 10" or 12" unit.

sreten.
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Old 1st April 2004, 05:56 PM   #4
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Hi Philip, I would suggest just waiting on the AV8s. There's no way you could drop in PL22s.

BTW, where do you live? I'm in Gaithersburg and I own Kit281s.
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