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Old 22nd August 2005, 04:22 PM   #11
MCH is offline MCH
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Thanks for all the input.
I think I'll go with 1 driver for the center channel. My question now is the cab design. Is the Aperiodic 4liter style a good choice for this application? The 13 liter mini Onken design that I used for the mains is a tad too large and bulky looking for a center. Laying it on it's side might work though. But I don't know if this is detrmental to the sound.
Also would the Aperiodic integrate with my mains? Keep in mind that these will be utilized with a sub crossed over at a 100hz.
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Old 22nd August 2005, 04:42 PM   #12
morbo is offline morbo  Canada
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I will post a picture of my center channel tonight. Off the top of my head - its 12" wide, 6.5" tall, and 18" deep or thereabouts, with a single shelf brace along the longest dimension. Rear ported, tuned to ~50hz. If I was doing it again, I'd port a bit higher and the box could be either narrower or shallower.
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Old 22nd August 2005, 05:00 PM   #13
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Keep in mind that these will be utilized with a sub crossed over at a 100hz.

I'd use a sealed .25 cu ft box, crossed to the sub at 80 Hz:
Q= .86, F3= 78Hz.
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Old 22nd August 2005, 06:37 PM   #14
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Quote:
Originally posted by audiobomber
I'd use a sealed .25 cu ft box, crossed to the sub at 80 Hz:
Q= .86, F3= 78Hz.
What parameters and software are you using. I'm getting .25 cu ft box Q = .75, F3 = 90Hz with WinISD Pro.
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Old 22nd August 2005, 06:47 PM   #15
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Quote:
Originally posted by Landroval
What parameters and software are you using. I'm getting .25 cu ft box Q = .75, F3 = 90Hz with WinISD Pro.
Hmm, this isn't the first time this has happened. I'm using WinISD beta #0.44

Qts = .64, Fs = 68, Vas = 5.8 liters.
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Old 22nd August 2005, 07:17 PM   #16
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Quote:
Originally posted by audiobomber
Qts = .64, Fs = 68, Vas = 5.8 liters.
Ok. Those are for WR125S/ST. FR has Qts = 0.56, Fs = 67.4, Vas = 5.58. So maybe that's the difference.
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Old 22nd August 2005, 07:53 PM   #17
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Sorry, I thought I'd read somewhere that the specs were the same except for frequency response.

I tried again with WinISD version .44, using the proper FR125S specs, and I got F3= 86Hz and Q=.75

Anyway, a sealed box makes a lot of sense for a center channel when crossed to a sub, don't you think? According to Dickason, "If you cannot get an enclosure resonance from a TL or vented type configuration at least two octaves below the crossover frequency, use a sealed configuration."
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Old 22nd August 2005, 08:29 PM   #18
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Originally posted by audiobomber
Anyway, a sealed box makes a lot of sense for a center channel when crossed to a sub, don't you think?
100% agree. I would probably build a sealed center even without a sub. You can also go from 0.25 cu ft easily to 0.15 cu ft without sacrificing much at all.
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Old 22nd August 2005, 09:11 PM   #19
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Quote:
Originally posted by Landroval
I would probably build a sealed center even without a sub.
Me too! Center channel locations are usually compromised, in which case a sealed box won't be as problematic as a port. Less tendency to boom.
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Old 23rd August 2005, 04:02 AM   #20
MCH is offline MCH
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OK. I think I've decided on the cab volumes. I think I'll use the .25 cu.ft (7 liters) for the center . For the surrounds (hang on the wall for my application) I'll use the .15 cu. ft (4.25 liters). I'm sort of lost on all the calculations above; but I assume there seems to be an agreement that these will work fine in the cab volumes I've described.
thx for the input.
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