Scaling up the SS15 for an 18" driver and other compact 18" designs - Page 4 - diyAudio
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Old 23rd January 2012, 09:17 PM   #31
Xoc1 is offline Xoc1  United Kingdom
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If some of the drivers are so far out of spec is it totally out of the question to recone them?
I know that you have real problens with sourcing and shipping costs, but if the good ones are working well, then a couple of replacement baskets would sort out your problems and get these bass bins all working together!
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Old 23rd January 2012, 09:54 PM   #32
col is offline col  Australia
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Quote:
Originally Posted by Xoc1 View Post
If some of the drivers are so far out of spec is it totally out of the question to recone them?
I know that you have real problens with sourcing and shipping costs, but if the good ones are working well, then a couple of replacement baskets would sort out your problems and get these bass bins all working together!
They are quite new. Probably around 100 hours use all up. Seeing the baskets are "field replaceable" I might try un-bolting them and having a look, maybe the voice coils were not centered properly when assembled.
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Old 23rd January 2012, 10:17 PM   #33
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Taking into consideration the driver and port displacement the vented box comes in closer to 121 litres. It's tuned to 38.66hz (according to WinISD).

The BR box is around 3-6db lower in amplitude than the Cubo18ext but with far better response and much lower extension. Also, it will take heaps of power.

The filters were set at 35hz HP 48db LR and 90hz LP 48db LR.

What if I took the 2 worst performing boxes and rebuilt them using 200 litre BR and tuned them lower, would they still play along nicely with the smaller cabs?

cheers,
col.
3-6 dB different in upper amplitude, but 10 dB more bottom, I'd choose th BR for sure.
Different Fb will make the phase response different, and require different HP, so not a great idea to mix and match. That said, by arranging the array it is possible the combined response could be fine.

A BW filter will not cut as much around the LP point as LR, and 24 dB is really adequate, many complain of "ringing" with a 48 dB per octave slope.
You want protection, not rubber gloves .

One problem I have heard of with Peavey drivers that use a foam cover over the vent is the foam disintegrates and gets sucked in the gap, melting into a goo.

Checking the poor performing drivers for gunk in the gap would be in order if there is no cover over the vent.
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