I'm Brandon,
I have a M-audio projectmix 8 channel mixer (http://m-audio.com/products/en_us/ProjectMixIO.html). I have recently taken it apart to see if there are any mods I can do. I found that there are 8x JRC5532 opamps on the XLRs inputs. These I want to replace first. There are JRC4580 opamps on the TRS inputs and 4 JRC4580 opamps on the 4 main speaker outputs. Money being no option, I am looking to replace all opamps with the BEST opamps as far as specs go... highest frequecsy response 20hz-20khz and so forth. I am not an engineer by any means but am very handy with a soldering iron and can follow schematics decently. This mixer cost me $1200, so I just want a drop in chip. I do not want to have to change the circuit at all. However, I will also be replacing the caps with top end caps-I can easily look at the specs on those so.. do not nee help with that. I do not have schematics for the Projectmix, but can provide some photos inside. Any one who can help my e-mail is warsleyer@aol.com.
