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Old 27th May 2004, 12:19 AM   #1
SQ Kid is offline SQ Kid  United States
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Default parts express carbon fiber speaker

hey, embarking on the mission to put these things to work. parts express got rid of a whole bunch of onkyo buy-out stuff, one being the 4" carbon fiber woofer. i picked up 4 of these so i could run a stereo pair at 8 ohms (they are originally car speakers, so they are 4 ohm). i ran the numbers through winISD, and what i got seems a little on the big side. its saying i need a little over .5 cu ft of air space in a sealed setup per speaker. has anyone else used these yet (i know people were buying them because they were the first speakers to be sold out in the buyout). for anyone unfamiliar with the speakers:

PE #269-737
Le: .40 mH
Znom: 4 ohm
Re: 3.6 ohm
Fs: 95 Hz
Vas: .11 cu ft
Qms: 3.40
Qes: 1.38
Qts: .98

lemme know if anyone has any suggestions. i'm pretty set on having a TWW setup, tall floor standing speakers. thanks
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Old 27th May 2004, 12:26 AM   #2
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I actually used a pair in my B&W DM302's and just ran them full-range....I liked em better.

I pried that cardboard ring off too....go slowly pulling outward 90* to the driver frame.

I still have two...don't know what I'll use them for.
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Old 27th May 2004, 02:40 AM   #3
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The frequency response is actually very good up to 4K for $3... Combined with the high Qts, you can run these open-baffle perfectly fine.

I wish I'd gotten a few of these to experiment with!
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Old 27th May 2004, 07:08 AM   #4
sreten is offline sreten  United Kingdom
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well Fs = 94Hz, Qts = 1, Vas = 3.1L, Xmax = 1mm pretty much
rules out low bass completely at any reasonable volume level.

0.5cuft is 14L and at this volume you get a Q = 1.1, which
only shows the drivers are intended for "shelf" mounting.

I'd suggest mounting them in 4 to 5 litres per driver and
crossing them over at 200 to 300hz to genuine bass drivers,
the crossover function taking care of the peaking at ~ 130Hz.

They should be wired in series for 8 ohm nominal.

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Old 30th May 2004, 12:04 AM   #5
SQ Kid is offline SQ Kid  United States
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thanks for the info. anyone else used these yet? looks like i will be putting them in around 9L boxes (seeing as i will be running 2 to get the 8 ohms i need) and probably put a tweeter in up top. got about 2 dozen from the same buyout, including the odd shaped ones. but we'll start with just the mids....

thanks again
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