Can anyone suggest a cabinet design for this driver? - diyAudio
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Old 18th November 2011, 01:53 AM   #1
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Default Can anyone suggest a cabinet design for this driver?

Hello everyone,,,
I recently been given four 8" full range drivers with the follow information...

speaker features a curvilinear paper cone, treated cloth accordion surround, stamped steel frame, 10 oz. ceramic ferrite magnet, 1" voice coil, and an 8 ohm nominal impedance. Parasitic "whizzer" cone for enhanced dispersion and high frequency response.
Specifications:
*Power handling: 30 watts RMS/60 watts max
*VCdia: 1" Le: 0.68 mH
*Impedance: 8 ohms
*Re: 5.6 ohms
*Frequency response: 100-16,000 Hz
*Fs: 107 Hz
*SPL: 89 dB1W/1m
*Vas: 0.32 cu. ft.
*Qms: 5.49
*Qes: 2.42
*Qts: 1.68
*Xmax: 2 mm

Now given the fact that its Qts value is quite high, suggest that its best use in OB design with very large baffle, or sealed but not enough bass extention unless the box made bigger which I do not have large enough space in my living rented apartment. I have tried a single 8" in a 2ft high by 12 inch wide by 4 inch deep enclusure with 9 one inch holds and moderate stuffing (I guess you can call it Aperiodic), along with a simple BSC circut. It actually sounded very nice with some quartet jazz music. Bass extended a little bit which shown some potential. This is just some quick rig to see how its sound the least as i am searching more infos regard to aperiodic design.

Can someone suggest a proper box design for this particular drivers ?
I know box suggestion is very limited for this FR driver, but I thought may be ask the expert here. This is a great full range forum, ever !!!

I want to use 2 per side with a cheap super tweeter (MTM).
I enjoy all kind of music styles.
I am using a two channels yamaha CA410 integrated amp and i also just got a Longines Symphonette vintage reciever.

Thank you so much, guys !!!
Alex Sagamotto.
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Old 18th November 2011, 03:04 AM   #2
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I would check your T/S parameters. An 8" paper cone with a Fs of 107Hz? And only 2mm Xmax? Did you mean an 8cm driver? If you post the brand and model #, you will get better advice. If you don't know, post some photos, and tell us from where you got those T/S parameters.

-Byron
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Old 18th November 2011, 03:18 AM   #3
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RE = Byron

Well, actually the T/s parameter is published by Partsexpress' site. Fs=107 hz and 2 mm X-max is very typical for 8" cheapy whizzer paper cone driver... Unfortunately, the unit is all sold out from partsexpress. But on the back of the magnet it say G8, 8 ohms, Made in Philipines. Hope this clear your confussion...

Alex Sagamotto.
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Old 18th November 2011, 06:45 AM   #4
GM is offline GM  United States
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Greets!

Actually, assuming you want to use it to flatten out [damp] its high Q, an OB shrinks in size with increasing Qts above ~0.8. Regardless, for box loading, ~aperiodic TL is the way to go, so using Rick Shultz’s Alpha TL designer:

Fp = Fs/Qts = ~ 63.7 Hz for flattest response with a very low output impedance. For high output impedance, ideally you need to increase Qts as required, making it longer/’fatter’. For dual drivers, double CSA.

L = ~49.12”
CSA = ~89.813”^2

FWIW, I do it a bit more ‘old school’, which tunes it a bit lower:

Fp = Fs/Qes = ~ 44.2 Hz

L = ~72.86”
CSA = ~117”^2

Per Alpha TL:

L = ~72.33”
CSA = ~63.8”^2

This seems a bit too constricted for ‘FR’ driver use to my way of thinking, though fine for a [mid] bass driver, but never having tried it, only one way to know for sure, so Caveat Emptor.

Off setting the driver[s] at L*0.349 per MJK’s Classic TL Alignment doc will smooth them out some, reducing stuffing density required. For duals, this location would be centered between the two if vertically oriented.

GM
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Old 18th November 2011, 10:53 PM   #5
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well hello GM, how are you ? thanks for taking the time to view my subject...

Well, I have pondered upon something similar awhile ago, the TL lenght you suggested seem about right, the longer the better the low extention which put more emphasies toward stuffing. But wouldn't aperiodic TL be anything like BHL design...?

The point is, the cab has to be compact or slim hence my living room is small. I come up with a design somehow ressemble the "car's muffler" where a two 4ft 3" dia pvc pipe goes straight inside a 24"x6"x11" enclosure. The pvc section that stay inside the cab each have six 1/4" wide slot wrap with wall insulation fiber. But i wouldn't know how long the slot need to be.
Would something like that work...?

Thanks.
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Old 19th November 2011, 04:16 AM   #6
GM is offline GM  United States
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Greets!

Doing OK, I guess. Hope things are OK at your end. No, an aperiodic TL is nothing like a BLH except for both having a very long, big 'vent'. Yes, you could do a pipe-in-pipe TL, though due to the stepped expansion it will need to have a longer axial length for a given Fp. Adding slots to the pipes would tune them higher, so these would shorten the acoustical axial length, ergo not a good plan to slot them plus don't know how to calculate or even sim them.

GM
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