Just the standard D16R2450's, they are suprizingly well behaved. That's one more pair of diaphragms in the mix!
I think JeffW is sending a 2452, the test pile just keeps getting bigger!
Just the standard D16R2450's, they are suprizingly well behaved. That's one more pair of diaphragms in the mix!
I think JeffW is sending a 2452, the test pile just keeps getting bigger!
If we knew what the hell we were doing, we wouldn't call it research would we.
Thanks, when it comes time to send it all back at least I'll get UPS 100+ pound weight break!
If we knew what the hell we were doing, we wouldn't call it research would we.
Lots of very good comments in this thread. Despite the mild comments, I still ended up buying two 2445s for $125 each, with original JBL diaphragms. The intention is to "appreciate" them as they are for a while, and then find some better diaphragms along the way.
Also realizing that I have no choice but going to a four way system and needing to buy another active crossover, unless I make a dividing network (with L pad) between the 2445 and the 2405 with crossover at around 8KHz, and keep running one 3-way active crossover only. The positive point is that it is much cheaper to make a crossover for high frequencies than low ones...
I need to revisit these 2445's, after talking with a couple of forum members it is probable that I incorrectly identified the diaphragms, I am reasonably sure they are Ti, but they are smooth, not ribbed as apparently the D16R2450 diaphragms are? This one looks like an uncoated D16R2452SL by sight and measurement. I have a 2452H here that I need to get apart, I will see what that one looks like, another possibility is the diaphragm that comes in the 2451 I guess.
What ever they are they sound and measure good.
If we knew what the hell we were doing, we wouldn't call it research would we.
So ignoring phenolic and specialty consumer drivers,
the 4" dia seem to be assignable to 5 categories
(other variations seem to only be impedance (8/16) and included
hardware):
Al concentric surround/smooth dome (2440)
Al diamond surround/smooth dome (2441)
Ti diamond surround/smooth dome (2445)
Ti diamond surround/ribbed dome (2446)
Ti diamond surround/smooth dome/aquaplas (2450SL)
...the last three being not limited to the example driver listed.
Does that sound about right?
Thank you. I will have to look again, it's all a blur now.
If we knew what the hell we were doing, we wouldn't call it research would we.
Slight edit:
Al concentric surround/smooth dome (2440)
Al diamond surround/smooth dome (2441)
Ti diamond surround/smooth dome (2445)
Ti diamond surround/ribbed dome (2446)
Ti diamond surround/smooth dome/aquaplas (2450SL)
should be:
Al concentric surround/smooth dome (2440)
Al diamond surround/smooth dome (2441)
Ti diamond surround/smooth dome (2445)
Ti diamond surround/ribbed dome (2446 / 2450)
Ti diamond surround/smooth dome/aquaplas (475)
( there was no pro model 2" exit with a coated dia )
the 2450SL ( coated, smooth Ti ) was a 1.5" exit - and it had a different mounting bolt dia than the non-coated 2451. 2450SL-a was the coated, ribbed Ti.
The newer 2452SL has the coated, smooth Ti but has a pair of special push terms added to a stock 2450SL dia.
Ok the 2445's that I like have D16R2445's in them, Ti, diamond surround, smooth dome.
Thanks guys!
If we knew what the hell we were doing, we wouldn't call it research would we.
these terminals can be removed without problem
... and added. I've put a 2450SL dia in a 2452H body. I just reused the rubber 'plugs' and threaded terminals.
The 'different mounting bolt dia' referred to by 'beer is for the horn/driver interface,
not the diaphragm.
I haven't tried the TrueXtent dias in the 2452 body, but IIRC, someone here has
(perhaps requiring a trim of the rubber plug/gasket things, as the dia frame seems
a bit taller... I haven't measured them or looked it up).
Cooky did it without major issue:
http://www.audiosmile.com/forum/show...2&postcount=87
I wish he would have taken one more set of pics showing how he hooked the terminals up.
There are currently 1 users browsing this thread. (0 members and 1 guests)