Connecting 3 ZMACS for a total of 10 amps

Stage & Studio ZMACS
1

Hi. I’m trying to connect 3 Zmacs in a row, based on the diagram in the Manual. The diagram only shows 2, but I’m using the connections shown there to expand to the third one.

I’m going from the Link Output on the second unit to the passive input on the third.
I’m going from the #1 “to speaker cab” output on the first unit to the #4 “from amp output” input on the third.

I’m able to listen to the amps on the first and second units on the cabs connected to the third unit.

The issue I’m having is a terrible noise when I try to listen to the cabs on the third unit.

If I use the active input on the 2nd unit (instead of the passive), I can get the 3rd unit to work, but then I have terrible noise on the second unit.

Has anyone gotten three units to work in series? Do I need some kind of transformer isolator somewhere in the chain to make this work?

Thanks!

2

Hi Fulibarri,

It sounds like you may be getting a ground loop somewhere in the chain. Are you stacking these units? are they in a rack? are they being fed from the same power source? I have so many questions for you. Let’s just start with the ones I just asked, and we’ll keep it moving until this set up works.

Thank You,

Terry