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Heh! The 2121 isn't that bad ;)

Is there a special reason for using 3 MOhm Resistors for the bias voltage? Comon is 2.2 MOhm, right?

I don't see that. JBL and many other speaker companys did that. I did that too.
Soldering is more dangerous.

Here are some more informations about the 2121H

http://audioheritage.csdco.com/vbulletin/showthread.php?t=2985&highlight=2121

Honestly I see no sense why. I biamped mode it is out also. So what the heck.....
They confused us :yes: again

Exactly ;)

But it will take time to do that.

As I wrote, they are cabled like that !

Aha! We found the ultimate way to optimize a 3143 network :p

:crying: This 3141 schematic also have the 52 uF in Line :shock:


Or am I :screwy: now?

The schematic on JBLPROSERVICE says HF and UHF BEHIND 52 uF in passive mode.

I modified my 3143 networks last year, checked this and it is cabled according to schematic.

Damned, now you...

This I don't understand.
The 52 (+4) uF Cap is part of the high pass section of the bandpass for the 2121. Why the HF and UHF can't bypass it?

Looks not too bad.

Pic shows theoretical voltage drive.