M4 and RT/250 possible power problem

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Here's an odd problem... When I turn on my Boss SE-70 effects processor my M4's sound loses it's edge and kind of sags (in a bad way) like there's not enough power. When I power off the processor the M4 bounces back to full glory. I thought it might be a problem with the Boss but when I recently tried out a different processor (new processor on, Boss off) I got the same problem. I'm running everything through a Furman PL-PLUS with voltage & current meters. The current without any processors is 2.3 to 2.4 and with one processor it's 2.5 to 2.6.

Has anyone ever heard of this problem? Am I pulling too much power through the Furman, i.e. it's not rated high enough? I'm going to try powering the M4 from another outlet and see what happens. Any other suggestions?

Thanks
 
I run through a pl plus series II furman,M4,G systen,tuner and RT 250 and never had a problem like that,I don't know what it could be.Please post results if you figure it out.
 
Please explain how you connect everything.

Egnater
 
Sorry for the delay. Here is a pic of my signal flow. FYI, the M4 and RT2/50 are in a separate 6U rack, everything else is in a 10U rack. Both processors are used in parallel loops in the Switchblade so the dry analog tone is preserved.

http://ugg.dyndns.org/pictures/guitar_rig/guitar_rack_signal_flow.jpg

I moved the M4 and RT2/50 power cords to another outlet and that cleared up a lot of the hum I was getting w/ high gain modules. This tells me I need to pull everything from the Furman and add them back one by one and see where the noise is coming from.

With the M4 and RT2/50 still on a separate outlet, I turned on the Boss and the M4 started losing definition again (sag). Note that the sag happens even with a completely dry signal (M4 only with Boss turned on but not in the signal path). The Boss power supply is a large brick type w/ 2 prong outlet (not grounded) and I've tried to get it as far away from signal cables as possible.
Another clue, the Boss caused noise when I had the MIDI out from the M4 into the MIDI in on the Boss. When I rerouted MIDI using a 1 in 4 thru box, some of the noise went away (but the sag is still there). Ground loop issue? FYI, the ground loop is lifted on the M4.

The Behringer processor doesn't seem to be sucking any tone now, so I think the problem is limited to just the Boss. When I move the M4 and RT2/50 back on the Furman I will check the Behringer again.

I realize it's difficult to debug this sort of thing without hands on, but I appreciate any advice.

Thanks,
Gregg
 
Update:
While going through my rig piece by piece I discovered one bad cable and that my Alembic pre isn't working correctly. Pulling the Alembic and replacing the bad cable eliminated a lot of hum. There still seems to be slight hum coming from the GCX but not enough to worry about. If I can't nurse the Alembic back to health I will replace it with a T/D module.

I put the M4 and RT2/50 back on the Furman. The Boss was moved to a different outlet across the room. However, even with the audio in, audio out, and MIDI cables disconnected, powering on the Boss STILL caused the M4 to sag. The sag isn't as bad as when the Boss is powered by the Furman but it is still noticeable. At this point I need to test the Boss power supply. It may be on it's way out.
 
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