bose 302 drivers

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I'm trying to source replacement drivers for the out of production bose 302. It is a twin 12" bandpass design. The technical department at bose uk tell me they are no longer made and they can't help with T/S parameters or suggest a replacement. 

from the FAQ regarding T/S parameters I think I'm looking for low fs (origional spec suggests cabinet useable freq. range is 20Hz - 180Hz) Qts over 0.28 but with as high a BL as possible?

I have the origional blown drivers so should I be trying to measure Sd, Mmd, xmax?

Any advice appreciated.

edit; comparing the 3 ferrite 12" drivers made by Precision Devices, my thoughts are that PD122 is the best option (fs-45 xmax-4 QTs 0.194 Mms-65 BL-22.1)

PD121 (fs-60 xmax-2 QTs 0.201 Mms-54 BL-23)

PD12sb30 (fs-50 xmax-7 QTs 0.297 Mms-67 BL-19)               - 2nd choice

Edited by imageoven - 13 August 2008 at 12:38pm

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imageoven Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 28 March 2007 Location: Scotland Status: Offline Points: 2186	Post Options Post Reply Quote imageoven Report Post Thanks(0) Quote Reply Topic: bose 302 drivers Posted: 13 August 2008 at 12:22pm
	I'm trying to source replacement drivers for the out of production bose 302. It is a twin 12" bandpass design. The technical department at bose uk tell me they are no longer made and they can't help with T/S parameters or suggest a replacement. from the FAQ regarding T/S parameters I think I'm looking for low fs (origional spec suggests cabinet useable freq. range is 20Hz - 180Hz) Qts over 0.28 but with as high a BL as possible? I have the origional blown drivers so should I be trying to measure Sd, Mmd, xmax? Any advice appreciated. edit; comparing the 3 ferrite 12" drivers made by Precision Devices, my thoughts are that PD122 is the best option (fs-45 xmax-4 QTs 0.194 Mms-65 BL-22.1) PD121 (fs-60 xmax-2 QTs 0.201 Mms-54 BL-23) PD12sb30 (fs-50 xmax-7 QTs 0.297 Mms-67 BL-19) - 2nd choice Edited by imageoven - 13 August 2008 at 12:38pm

spudmiester Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 22 March 2008 Status: Offline Points: 164	Post Options Post Reply Quote spudmiester Report Post Thanks(0) Quote Reply Posted: 13 August 2008 at 5:16pm
	If I remember rightly, some people replaced them with JBL's as standard, even if the bose were ok. This was 15 years ago though and recon RCF might be better these days. Dont know how it would work with the bose controller though !

S.A.L.S.A Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 15 June 2008 Location: Aruba DC Status: Offline Points: 21	Post Options Post Reply Quote S.A.L.S.A Report Post Thanks(0) Quote Reply Posted: 14 August 2008 at 4:03am
	I hear that the Eminence Lab 12 inch speaker is usefull in these BOSE 302 cabinets, they're not expensive and easy to get. Check on the web of Eminence. Dave
	Get to the Point with L'acoustics Dv-Dosc!

ceharden Members Profile Send Private Message Find Members Posts Add to Buddy List The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776	Post Options Post Reply Quote ceharden Report Post Thanks(0) Quote Reply Posted: 14 August 2008 at 11:02am
	You are going to need to measure the cab, volume, ports etc and do some simulations with different drivers. Bandpass cabs are really fussy on their drivers.

tweeter box Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 21 October 2007 Location: United Kingdom Status: Offline Points: 6784	Post Options Post Reply Quote tweeter box Report Post Thanks(0) Quote Reply Posted: 14 August 2008 at 2:49pm
	ive replaced blown drivers in these with eminence years ago! sounded better than the original drivers if i remember correctly

colint Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 06 October 2007 Location: United Kingdom Status: Offline Points: 5227	Post Options Post Reply Quote colint Report Post Thanks(0) Quote Reply Posted: 14 August 2008 at 5:15pm
	We replaced the drivers in some 302's with rcf L12-544's (not sure if there still avalable though) and they worked a treat a lot better than the bose drivers, on the downside you needed a fork truck to lift them!
	Never criticise another man until you've walked a mile in his shoes. Once you have, call him what you like, you're a mile away and you've got his shoes!

imageoven Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 28 March 2007 Location: Scotland Status: Offline Points: 2186	Post Options Post Reply Quote imageoven Report Post Thanks(0) Quote Reply Posted: 15 August 2008 at 2:25pm
	Thanks everyone (although I have to say simply recomending manufacturers misses the point somewhat) Further enquiries have revealed that Wembly still have some kits so can recone the blown ones. Out of interest, what software is best (for a novice) to model bandpass cabs. And for anyone else looking for alternate drivers for these, I know of a pair of 302's which have been fitted with PD912's and which have survived some serious abuse, I can't say how the sound compares to the origionals though.

csg Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 17 September 2007 Location: bedford Status: Offline Points: 6086	Post Options Post Reply Quote csg Report Post Thanks(0) Quote Reply Posted: 17 August 2008 at 7:39pm
	ive used ciare 12sw 2005 drivers in 302's, and it works a treat.

SimonVR Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 13 August 2008 Status: Offline Points: 14	Post Options Post Reply Quote SimonVR Report Post Thanks(0) Quote Reply Posted: 25 August 2008 at 1:52pm
	I have used Eminence Delta 12 LFs in 302s for years. They compare favorably to the originals on efficiency and I drive them at just over 800w/cab quite happily. I feel they are slightly more 'punchy' but I don't think the low-end extension is quite as good. The differences are barely detectable though, even on an A/B comparison. Still 302s don't do really low-end anyway, you need subs for that. One warning though; do not use the 302 passive crosssover with these drivers, always bi-amp.

Shelfstacker Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 11 July 2008 Location: Midlands Status: Offline Points: 495	Post Options Post Reply Quote Shelfstacker Report Post Thanks(0) Quote Reply Posted: 29 June 2009 at 10:21pm
	Masssive big dirty necro post here, but I have a question. I've dug a pair of 302's out of the back of my lock up, and after general sanding down and painting, cosmetically they wear their 1993 vintage quite well. However, thay need four new twelves in them, and it's not really worth spending decent money as I won't get a decent return. So, what can we recommend these days? Same as last years advice above, or do we have some new ideas? I can get hold of Eminence Kappa Pro's at a good price new, would these work?
	If you are at the circus and being attacked by clowns - go for the juggler

jonminns Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 13 April 2008 Location: United Kingdom Status: Offline Points: 1877	Post Options Post Reply Quote jonminns Report Post Thanks(0) Quote Reply Posted: 29 June 2009 at 11:33pm
	I have a pair of 302s falling to bits, with 3 working drivers and 1 requiring recone Anyone interested in getting them out of the way for me? Jon

wires Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 21 May 2009 Status: Offline Points: 1365	Post Options Post Reply Quote wires Report Post Thanks(0) Quote Reply Posted: 29 June 2009 at 11:44pm
	I replaced some drivers in 302 cabinets a while back for an install, rewired them for speakon connecters then settled on using PD12SB30's and was really pleased with the results... lots of usable bass and quite punchy, but sometimes sound a bit one note-ish. Hope this helps.