Electro Frying Forum - Electro Voice SBA-760

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Electro Voice SBA-760

Printed From: Speakerplans.com
Category: General
Forum Name: Electro Frying Forum
Forum Description: Talk about drivers, processors and mixers
URL: https://forum.speakerplans.com/forum_posts.asp?TID=100629
Printed Date: 26 March 2026 at 4:39pm
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com

Topic: Electro Voice SBA-760

Posted By: IFixStuff
Subject: Electro Voice SBA-760
Date Posted: 07 November 2017 at 5:08pm

Got a couple of these. Drivers are excellent as are the cabinets. Both have bad amplifier plates. Have managed to sort out some issues with one of them, however, what is the deal with trying to get schematics for these things. They are not terribly complex, but it would certainly make life a little nicer if I had schematics. These are I believe obsolete, but still not available.

Any helpful suggestions.

Replies:

Posted By: IFixStuff
Date Posted: 07 November 2017 at 5:37pm

Oh, apparently they were also sold as Dynacord SUB 800A. But still no service manuals or schematics.

Posted By: IFixStuff
Date Posted: 11 December 2017 at 6:31pm

So, even without schematics, I now have one working Subwoofer plate, and the other one powers up, but no sound, and some iffy status light indications. Now, it could get interesting. Since I have one working unit, I can probe around with my trusty DVM and scope and look for differences. Might yet end up with two functioning units.

If I had schematics, they would both be fixed, but EV and Dynacord are very secretive type folks.

Posted By: Justmike612
Date Posted: 07 December 2025 at 12:05pm

Did you ever find schematics for these? I just picked one up, it has this sort of loud tick noise every few seconds. I opened it and suspect a few of those big MOSFETs are bad. They are heating up quickly with no input

Posted By: d.antonis
Date Posted: 08 December 2025 at 11:07am

I have a SUB800A DYNACORD, i see that it must be the same module as the electrovoice one. I got it 2nd hand with problen on the woofer, a bit warped voice coil, must send it for service. The module generally worked ok, but i had to resolder many dry joints, witch would possibly create problems in the future. The warped coil is a sign of rather heavy use in the past, i presume.