RCA Mechanism Speakers
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Rob-F
Likes Vintage Gear and DIY
My first impression was of a midrange. Then it occurred to me, it could very well be out of a drive-in theater speaker--the kind we used to hang in the door window. RCA made those. I'm not sure this is what it is--just a hunch. It bothers me that it looks a little too deep for to fit in the housing; and it seems like it ought to have some openings in the rear for sound pressure. My 2 cents!
Those look like the phenolic cones RCA was noted for.
You should go to the forum at the Lansing Heritage site and look up a fella named Steve Schell. He knows a LOT about RCA speakers.
You should go to the forum at the Lansing Heritage site and look up a fella named Steve Schell. He knows a LOT about RCA speakers.
bowtie427ss
Lunatic Member
Can you determine what the frames are made of?
They're possibly MI-2934, brass frame, phenolic cone, 5-1/4 inch.
There used to be some RCA catalog pages online, but i cannot locate them.
They're possibly MI-2934, brass frame, phenolic cone, 5-1/4 inch.
There used to be some RCA catalog pages online, but i cannot locate them.
http://www.audiovoice-acoustics.com/forum/attachment.php?attachmentid=1001&d=1217504536
http://www.audiovoice-acoustics.com/forum/attachment.php?attachmentid=1003&d=1217504557
The following text has been pasted from another site:
Attention all single ended Class A tubo-philes. These RCA midrange speakers are extremely efficient and have a surprisingly smooth frequency response (see photos of 1/24th octave RTA tests). Massive magnets. The pair weigh 11KG! One piece phenolic cone/dust cover (will last forever). 1.5inch voice coil. Excellent build quality. Steel/Brass/Stainless.
Not sure if these were ever used. In excellent audio condition. I got these from National Radio New Zealand. They appear to have been sitting on shelves for many years. They probably would have been used for control room monitoring and/or paging, if they were ever used at all. I use an excellent microphone (40Hz-20kHz +0/-.25db…-1db at 20Hz) in my rather crude 1/24th octave RTA test set up. They appear to have a slight resonance at about 4kHz (transfer to dust cover). I would use as a midrange in a high efficiency 3-way speaker system. Set the crossover points at about 350Hz and 3500Hz (or 2000Hz if your tweeter can handle). Tonality and efficiency would match very nicely to an EV T35/350 tweeter which also have phenolic diaphragms. You might make the spouse happy without large horn flares in the living room. Then again custom horn loading would provide great results as well.
http://www.audiovoice-acoustics.com/forum/attachment.php?attachmentid=1003&d=1217504557
The following text has been pasted from another site:
Attention all single ended Class A tubo-philes. These RCA midrange speakers are extremely efficient and have a surprisingly smooth frequency response (see photos of 1/24th octave RTA tests). Massive magnets. The pair weigh 11KG! One piece phenolic cone/dust cover (will last forever). 1.5inch voice coil. Excellent build quality. Steel/Brass/Stainless.
Not sure if these were ever used. In excellent audio condition. I got these from National Radio New Zealand. They appear to have been sitting on shelves for many years. They probably would have been used for control room monitoring and/or paging, if they were ever used at all. I use an excellent microphone (40Hz-20kHz +0/-.25db…-1db at 20Hz) in my rather crude 1/24th octave RTA test set up. They appear to have a slight resonance at about 4kHz (transfer to dust cover). I would use as a midrange in a high efficiency 3-way speaker system. Set the crossover points at about 350Hz and 3500Hz (or 2000Hz if your tweeter can handle). Tonality and efficiency would match very nicely to an EV T35/350 tweeter which also have phenolic diaphragms. You might make the spouse happy without large horn flares in the living room. Then again custom horn loading would provide great results as well.
Johnny Vergouwen
New Member
Dear Eurasian,
I know it's been 7 years sinds you posted this message, but any chance I can get copies of those files?
the links don't work anymore, thanks in advance.
