mech986
03-28-2008, 01:05 AM
Sorry for a bit of cross posting but I thought more general questions need to be asked about these cabinets and more help can be solicited so I'm posting in this area.
I brought these boxes back home from this thread:
http://www.audioheritage.org/vbulletin/showthread.php?t=20502
Seller told me he found them at an auctiion house with most drivers removed except the surround less woofers along with additional hi-end stereo gear (the Accuphase pre/tuner above and a Nak Dragon). He got all of it for a VERY good price. He didn't remember any details about the woofers or crossover, just that all the mid/horn/tweeters were already gone. He sold the woofers and crossovers to a friend of his - I"m trying to track that down to see what was there.
Comparing them with the 4340/4341 brochure here:
http://www.jblpro.com/pub/obsolete/4340_4341.pdf
I've loaded a few pics below - the condition is very good with only a few minor scratches and a small gouge on one top, plus the obligatory fade/water stain on the other top. Double 4 inch ports are in the right places, woofer opening is 14 inches with 4 clamp marks for a 15 inch woofer, and the upper horn opening fits a 2307 horn and bolt circle just fine. Looks like the 2308 lens attachment was an early screw on type that had the wood strip support typically found on the C50 Olympus instead of the later velcro plastic unit?
However, things are not all they seem to be - right size and general shape for the 4340/4341 cabinet, walnut finish - but no JBL Blue at all to be found, the midrange opening is only 7" wide probably housing an 8" driver instead of a 10" (haven't measured the inner doghouse for volume yet) and the two openings for the tweeters fit the 2402/2405 horn but are lower than the alignment with the upper midhorn that I've seen.
Also interesting although not easily seen in the photos I've attached is the tweeters used were clamped with the typical outer horseshoe used for 075/2402 bullets. Also, sharp eyed folks will note there is no vertical line for the 4340/4341 3 level controls of the crossover - there are only two holes above one tweeter position - and a set of 4 holes below that would indicate the crossover may have been bolted in on the baffle instead of on the floor as most Studio Monitor series were. No usual cutout for input terminals, just 4 push connectors on the back panel - bottom pair looks like they ran directly to the woofer, top wires were cut off, presumably for the crossover. Maybe used with an active biamp setup? Top back panels look like they were exchanged.
Also, although I don't know the inner construction of the 4340/4341 type cabinets, these don't have really robust inner bracing - most of it is like 1 to 1.5 inch square, no 2 x 2 or 2 x 4 bracing yet found. The top of one was stuffed full of fiberglass, the other seemed to be missing it (maybe taken out when the drivers were taken out. The lack of a 3 control crossover seems weird.
So its quite curious about what these may be - DIY or prototype, custom monitor, early version of the 4340 - maybe a sort of 4333-4ish 4 way evolution? (remember seller can't recall type number labels or any details of the mid drivers - were gone already). And I have no idea what mid cone driver they would have used since only the 4315 uses a 2108 8 inch mid.
I also checked and its not one of the EN5 or EN8 enclosures either - wrong dimensions and baffle layouts.
I'm starting a new thread about these to get more LH people to comment on these? Maybe ask Greg T. or Mark G. about what they might be? And then what to make out of them? Use an 8 inch mid driver or enlarge the hole and doghouse to suit a 10 incher? Let me know what you think.
Regards,
Bart
I brought these boxes back home from this thread:
http://www.audioheritage.org/vbulletin/showthread.php?t=20502
Seller told me he found them at an auctiion house with most drivers removed except the surround less woofers along with additional hi-end stereo gear (the Accuphase pre/tuner above and a Nak Dragon). He got all of it for a VERY good price. He didn't remember any details about the woofers or crossover, just that all the mid/horn/tweeters were already gone. He sold the woofers and crossovers to a friend of his - I"m trying to track that down to see what was there.
Comparing them with the 4340/4341 brochure here:
http://www.jblpro.com/pub/obsolete/4340_4341.pdf
I've loaded a few pics below - the condition is very good with only a few minor scratches and a small gouge on one top, plus the obligatory fade/water stain on the other top. Double 4 inch ports are in the right places, woofer opening is 14 inches with 4 clamp marks for a 15 inch woofer, and the upper horn opening fits a 2307 horn and bolt circle just fine. Looks like the 2308 lens attachment was an early screw on type that had the wood strip support typically found on the C50 Olympus instead of the later velcro plastic unit?
However, things are not all they seem to be - right size and general shape for the 4340/4341 cabinet, walnut finish - but no JBL Blue at all to be found, the midrange opening is only 7" wide probably housing an 8" driver instead of a 10" (haven't measured the inner doghouse for volume yet) and the two openings for the tweeters fit the 2402/2405 horn but are lower than the alignment with the upper midhorn that I've seen.
Also interesting although not easily seen in the photos I've attached is the tweeters used were clamped with the typical outer horseshoe used for 075/2402 bullets. Also, sharp eyed folks will note there is no vertical line for the 4340/4341 3 level controls of the crossover - there are only two holes above one tweeter position - and a set of 4 holes below that would indicate the crossover may have been bolted in on the baffle instead of on the floor as most Studio Monitor series were. No usual cutout for input terminals, just 4 push connectors on the back panel - bottom pair looks like they ran directly to the woofer, top wires were cut off, presumably for the crossover. Maybe used with an active biamp setup? Top back panels look like they were exchanged.
Also, although I don't know the inner construction of the 4340/4341 type cabinets, these don't have really robust inner bracing - most of it is like 1 to 1.5 inch square, no 2 x 2 or 2 x 4 bracing yet found. The top of one was stuffed full of fiberglass, the other seemed to be missing it (maybe taken out when the drivers were taken out. The lack of a 3 control crossover seems weird.
So its quite curious about what these may be - DIY or prototype, custom monitor, early version of the 4340 - maybe a sort of 4333-4ish 4 way evolution? (remember seller can't recall type number labels or any details of the mid drivers - were gone already). And I have no idea what mid cone driver they would have used since only the 4315 uses a 2108 8 inch mid.
I also checked and its not one of the EN5 or EN8 enclosures either - wrong dimensions and baffle layouts.
I'm starting a new thread about these to get more LH people to comment on these? Maybe ask Greg T. or Mark G. about what they might be? And then what to make out of them? Use an 8 inch mid driver or enlarge the hole and doghouse to suit a 10 incher? Let me know what you think.
Regards,
Bart