PM1000 mix buss help

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JW

Well-known member
Joined
Jun 8, 2005
Messages
1,101
Location
Portland USA
Hey folks,

I've built up a 4X1 mixer with some Yamaha PM1000 strips, and the master buss card for the summing. Someone mentioned that I might have too few channels for the master load, as the board was designed to have 16 or 32 channels. It does sound a bit more honky, or aggressive when going out of the buss out, compared to how the channels sound by themselves (using direct outs) 

Here's are a couple links to schematics. I'm wondering if anybody might be able to recommend an improvement or two in the master buss circuit?

http://www.gearslutz.com/board/attachments/geekslutz-forum/161595d1267927139-yamaha-pm-1000-full-mixer-output-module-question-yamaha-pm-1000-master-monitor-output-module-schematic_-labeled-.jpg (master)

http://www.gearslutz.com/board/attachments/geekslutz-forum/356238d1375378912-did-i-just-destroy-my-pm1000-pm1k-schem-copy.jpg (input strip)

Looks like 33K summing resistors (in the input strip schematic)  So, if I were using only 4-8 input strips, should I modify the master circuit? I'm guessing it would be R3?

Also, it looks like C1 should be bigger, maybe C7 as well? Any other ideas?
 

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