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Post by woodmedic on Jun 17, 2019 15:48:58 GMT
I am wanting to install a pair of external speaker on a Rockola 477. These would require a run of wire in excess of 50ft. I was thinking that 70v would be the way to go for this application. I have never installed any of that type of speaker and wanted to see if there were any pitfalls with using those vs regular 8 ohm speakers. If not, do any of you have recommendations on some good 70V speakers for indoor/outdoor use? Thanks!
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Post by Ron Rich on Jun 17, 2019 16:16:34 GMT
Hi Chris,
First, check the Service Manual--it should 'splain how-what to do. 2.nd, "good" in/outdoor speakers--ain't non such thangs made, that I know of !
Most outdoor speakers are "tinny", while indoor speakers vary. If you want to use a CV system, you may use any speaker--you can add CV transformers, to anything ! What I usually do is install a plug at the speaker, and store it indors when not in use ---
Ron Rich
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Post by woodmedic on Jun 17, 2019 16:47:30 GMT
I skimmed through the manual and the only place I found mention was in the parts manual. It pointed out what the strip terminal was. I didn't see anything about external speaker connection. Should be the same concept as on the Rowe/AMI stuff I am guessing? It goes into depth on external speaker connections.
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Post by Ron Rich on Jun 17, 2019 17:02:06 GMT
Hi Chris,
Basically yep-- "CV" is CV-- I don't like CV speakers with transistor type amps-- The normal output of them requires that the internal speakers be tapped way down to get enough audio from the CV section--I usually use a low impedance speaker--with adequate sized wire to handle any loss--plus, like I inferred before, CV speakers are "tinny"-- . Ron Rich
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Post by woodmedic on Jun 17, 2019 19:29:17 GMT
Thank you for the info!
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Post by amiman66 on Jun 25, 2019 9:43:03 GMT
Hello Chris,
Back in the day when we used to install jukebox systems in pubs and bars we used 70 volt line for stair wells and toilet installations, they can be wall hung or ceiling speakers that are fitted with a line transformer (70 or 100 v line) these have various wattage tapings (0.5 to 4 W)and a 8 ohm connection.
Regards
Alan
Alan Hood
ami-man
UK
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Post by Ken Layton on Sept 30, 2019 2:27:03 GMT
We did likewise back in the day. Many of our tavern and restaurant locations had or wanted ceiling speakers. So the only real choice was to go with a 70 volts (a.k.a. "constant voltage" ) speaker setup.
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petep
New Member
Posts: 45
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Post by petep on Oct 2, 2019 15:01:45 GMT
Hi, I come from a commercial AV background. 70v speakers used to have a bad reputation. Now a days they sound almost as good as 8 ohm, as long as you get the right brand. Only a pro can tell the difference. Take a look at JBL commercial speakers, like the Control 25 AV. It will do 70v and 8 ohm and is weather proof.
Pete Pacione
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Post by Ken Layton on Oct 2, 2019 15:56:53 GMT
Years ago, there was an excellent self-published book (more like booklet) by Rod Manchester titled "Understanding The 70 Volt CV System". It did an excellent job of explaining the 70 volt (constant voltage) speaker system. It was 31 pages and copyrighted 1990. Published by Rod Manchester Company, 350 Los Altos, American Canyon, Calif. 94589. The booklet sold at the time for $9.95
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