I'm carpet bombing the fora for insight - anyone here know how to access EV coax tweeter diaphragms?
mhardy6647
Posts: 33,801
OK, I am getting a little desperate, so I am doing the "Johnny Appleseed" thing -- posting this plea at various & sundry fora, hoping some grizzled old (or young, for that matter!) EV guru will take pity on me ;-)
Besides that Altec Duplex thing... I have this other, somewhat nonlinear obsession related to vintage Electrovoice components. I (literally) grew up with EV loudspeakers. My parents had EV Wolverine twincone "fullrange" drivers in home-made cabinets when I was a wee lad). Consequently, I've acquired... a few... EV drivers over the past couple of decades. So, indulge me, if you would, and let me know if anyone here can help with an EV coax question.
15TRXBfront by Mark Hardy, on Flickr
Does ANYone here know how to get access to the tweeter diaphragms on these old EV coaxes (either the older, brown-colored or the newer, more massive white basket versions; there're a smattering of 'em both down in the basement, as I recall). Note that the fairly early 15TRXB in the photo above has the early T35(B) horn design, as opposed to the more commonly seen wider, ridged diffraction horn.
I "know" from the internet :-) that one can access the crossover components & the back side of the tweeter by removing the nameplate on the bell cover, and I further "know" that judicious use of a heat gun can enable such... but, beyond that, I can find no info.
A fellow on AK recently reported trying to get at the diaphragm on a 15TRXB, but it seemed that discretion was the better part of valor, and he backed off and decided to add a separate tweeter.
It appears that original EV diaphragms (which used to be sold as a unit with their housing and gaskets) are no longer available, but aftermarket diaphragms are.
Thanks for any and all insight!
I am getting tired of having large paperweights taking up so much space; I am really, really tempted to try replacing a tweeter diaphragm in one (or more!) as a winter project this year.
* Pretty sure the tweeter diaphragm in this one's bad; even gave it a CAT scan for noninvasive diagnosis ;-)
EV15TRXBflipside by Mark Hardy, on Flickr
Besides that Altec Duplex thing... I have this other, somewhat nonlinear obsession related to vintage Electrovoice components. I (literally) grew up with EV loudspeakers. My parents had EV Wolverine twincone "fullrange" drivers in home-made cabinets when I was a wee lad). Consequently, I've acquired... a few... EV drivers over the past couple of decades. So, indulge me, if you would, and let me know if anyone here can help with an EV coax question.
15TRXBfront by Mark Hardy, on FlickrDoes ANYone here know how to get access to the tweeter diaphragms on these old EV coaxes (either the older, brown-colored or the newer, more massive white basket versions; there're a smattering of 'em both down in the basement, as I recall). Note that the fairly early 15TRXB in the photo above has the early T35(B) horn design, as opposed to the more commonly seen wider, ridged diffraction horn.
I "know" from the internet :-) that one can access the crossover components & the back side of the tweeter by removing the nameplate on the bell cover, and I further "know" that judicious use of a heat gun can enable such... but, beyond that, I can find no info.
A fellow on AK recently reported trying to get at the diaphragm on a 15TRXB, but it seemed that discretion was the better part of valor, and he backed off and decided to add a separate tweeter.
It appears that original EV diaphragms (which used to be sold as a unit with their housing and gaskets) are no longer available, but aftermarket diaphragms are.
Thanks for any and all insight!
I am getting tired of having large paperweights taking up so much space; I am really, really tempted to try replacing a tweeter diaphragm in one (or more!) as a winter project this year.
* Pretty sure the tweeter diaphragm in this one's bad; even gave it a CAT scan for noninvasive diagnosis ;-)
EV15TRXBflipside by Mark Hardy, on Flickr Comments
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I know JBL had something similar. The pole piece was hollow and threaded, so a small pipe could be attached, with the tweeter mounted on the end. The whole assembly could be unscrewed, and the tweeter/diaphragm could be serviced.Home Theater/2 Channel:
Front: SDA-2ATL forum.polkaudio.com/discussion/143984/my-2as-finally-finished-almost/p1
Center: Custom Built forum.polkaudio.com/discussion/150760/my-center-channel-project/p1
Surrounds & Rears: Custom Built forum.polkaudio.com/discussion/151647/my-surround-project/p1
Sonicaps, Mills, RDO-194s-198s, Dynamat, Hurricane Nuts, Blackhole5
Pioneer Elite VSX-72TXV, Carver PM-600, SVS PB2-Plus Subwoofer
dhsspeakerservice.com/ -
I was hopin' you might know! :- )
This was posted in response to my plea at the lansingheritage forums; looks much like your description (not necessarily a walk in the park to prosecute by a ham-fisted amateur like me, though, it appears)
http://www.diyaudio.rs/topic/2211-electrovoice-12trxb-vivisection/#
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The link you gave shows a cutaway view, with the diaphragm's lead wires traveling down along side the through bolt. The photo in a later post, shows the lead wires draped over the woofer. Not sure what is correct. The photo looks ad-hoc, or it was partially disassembled.Home Theater/2 Channel:
Front: SDA-2ATL forum.polkaudio.com/discussion/143984/my-2as-finally-finished-almost/p1
Center: Custom Built forum.polkaudio.com/discussion/150760/my-center-channel-project/p1
Surrounds & Rears: Custom Built forum.polkaudio.com/discussion/151647/my-surround-project/p1
Sonicaps, Mills, RDO-194s-198s, Dynamat, Hurricane Nuts, Blackhole5
Pioneer Elite VSX-72TXV, Carver PM-600, SVS PB2-Plus Subwoofer
dhsspeakerservice.com/ -
The latter, I suspect -- sort of like those "Body Works" exhibits, but with a loudspeaker corpse instead of, well... you know...
