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I have an NAD preamp that I am using to feet a signal to an Ashly FTX-2001. I am getting a hum when the rca to 1/4 cables are plugged into the amp. I used the same cables with a QSC amp and had no issues. Do I need some other type of adapter? I noticed the ground lug on the amps power plug is missing - was going to replace that.
Thanks
Derek.-
Follow Ups:
Page 8 of the manual shows how unbalanced cables (1/4" or XLR) should be wired. Are you using a cable with a mono 1/4" plug where the "ring" is grounded (like the illustration)? Some plugs have an insulator instead of the ring, or a stereo plug might have the ring unconnected.
Is the ground jumper strap on the terminal block (linking the input ground with chassis ground) still there?
Ground strap is on.
I hooked up my Behringer mixer to the amp and its dead quiet - when playing through the mixer. It wasn't until I took the preamp out from the NAD preamp and plugged it in that the noise started. I hooked up my old Phase Linear 400 and it was dead quiet on the NAD preamp. Not sure where to go from here. Doesn't seem like anything is malfunctioning - so where is this buzz coming from?
Thanks
Derek.-
The hum is from what is called a ground loop
If the ground is missing off of the plug then by all means put a new end
on the AC cable with a ground post
You can google how to get over ground loops on the net
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