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rusty jefferson
08-12-2013, 04:02 PM
http://www.jblproservice.com/pdf/Vintage JBL-UREI Electronics/UREI-813B.pdf I have a friend who is starting to build a pair of crossovers for a diy 811B project. The only schematic he could find is attached (last page) and has a few unreadable values. Does anyone have a better schematic, or if you have a pair, could you please check the value of C3 and C4 and let me know? Thanks in advance.

stephane RAME
08-13-2013, 03:18 AM
The "C" version
http://www.jblproservice.com/pdf/UREI%20Time%20Align%20Series/811C-L,R.pdf

Stéphane

rusty jefferson
08-13-2013, 03:39 AM
Thanks Stephane, but he is looking for the "B" version.

stephane RAME
08-13-2013, 06:17 AM
http://www.jblproservice.com/pdf/Vintage%20JBL-UREI%20Electronics/UREI-811.pdf

Stéphane

rusty jefferson
08-13-2013, 07:05 AM
Thanks again, but he is looking for the "B" version for use with the 801B Urei drivers.

eso
08-22-2013, 08:32 PM
https://dl.dropboxusercontent.com/u/4500648/Audio/811B crossover.pdf

While it doesn't say so, this is the 830 crossover schematic which is the correct crossover for 1 801B duplex in an 811B enclosure. The Crossovers are made in 2 parts with a large umbilcal cord connecting the sections. The time delay section is in the back panel with the signal binding screws and the high pass section, fuses, lights and trim pads are in the front panels. The light bulbs are important too. I'd really recommend going with the 813 with the helper woofer. They really kick.

This might come in handy too: https://dl.dropboxusercontent.com/u/4500648/Audio/UREI driver%3Ax-over matrix.pdf

Here's my 813Bs:

https://dl.dropboxusercontent.com/u/4500648/Audio/813BRepro.jpg

And one of my hardwood horns for these:

https://dl.dropboxusercontent.com/u/4500648/Audio/Rosewood.JPG

eso

stephane RAME
08-22-2013, 11:39 PM
https://dl.dropboxusercontent.com/u/4500648/Audio/UREI%20driver%3Ax-over%20matrix.pdf

Stéphane

rusty jefferson
08-23-2013, 04:56 AM
ESO,

Thanks very much for the schematic. Just what he's looking for.

Your second link didn't work, however.

I'm rebuilding a pair of 813Cs right now and have been talking to a few people about wood horns for them. I'd like to discuss your horns and will pm you later. Thanks again

eso
08-23-2013, 04:57 PM
ESO,

Thanks very much for the schematic. Just what he's looking for.

Your second link didn't work, however.

I'm rebuilding a pair of 813Cs right now and have been talking to a few people about wood horns for them. I'd like to discuss your horns and will pm you later. Thanks again

Try the link now. For some reason it didn't post correctly the first time.

eso