Urei 811B schematic help needed

[rusty jefferson]

http://www.jblproservice.com/pdf/Vin.../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]

The "C" version
http://www.jblproservice.com/pdf/URE...s/811C-L,R.pdf

Stéphane

[rusty jefferson]

Thanks Stephane, but he is looking for the "B" version.

[stephane RAME]

http://www.jblproservice.com/pdf/Vin...s/UREI-811.pdf

Stéphane

[rusty jefferson]

Thanks again, but he is looking for the "B" version for use with the 801B Urei drivers.

[eso]

https://dl.dropboxusercontent.com/u/... 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/...ver matrix.pdf

Here's my 813Bs:



And one of my hardwood horns for these:



eso

[stephane RAME]

https://dl.dropboxusercontent.com/u/...r%20matrix.pdf

Stéphane

[rusty jefferson]

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]

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

[Earl K]

@ESO ( or Rusty since you downloaded the file some 10 years back from a now dead link )

Would you please attach into this thread the Urei 811B ( or 813B ) schematic ( talked about earlier ).

& Yes, I have the same 813B User manual version with the impossible to decipher C3 and C4 values ( found on the last page ).

Thanks <> Earl

PS; this is nice work ESO ( I'm glad that you eventually posted these pics elsewhere, here on this website > unlike your earlier postings which all went poof!! into the ether )

[hjames]

@ESO ( or Rusty since you downloaded the file some 10 years back from a now dead link )

Would you please attach into this thread the Urei 811B ( or 813B ) schematic ( talked about earlier ).

Suspect this is the one you are referring to that is missing the far right side :

[Earl K]

Suspect this is the one you are referring to that is missing the far right side :

@Heather

Yes Thanks ( though I have that one, as did Rusty the thread starter ).

The missing part of the page ( far right ) isn't really a deal-breaker for me.

The issue(s) are the need for additional confirmation pertaining to the uF values belonging to capacitors C3 and C4 ( which seem somewhat questionable >> without me running some sims ).

[rusty jefferson]

Earl, naturally I didn't do the right thing and download and post it here for posterity, I just copied the links ESO posted and forwarded to my friend. I just sent him an email asking for a copy if HE downloaded it, or to let me know the C3 and C4 values. He still has the speakers so I should hear something shortly.

[Earl K]

Thanks Rusty!!

I really do appreciate your attention to this matter.

[toddalin]

Drool!



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