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How can I use both my Mark Bass amps at the same time

I'd use the master/slave method, assuming both have effects loops.

Whichever one has your preferred tones is your master. Use the effects send on that amp.

The other amp is the slave. Use the effects return on it as the input from the first amp's send.

Typically you can adjust each amp master volume for a good balance. Be aware though that the gain or input volume on the master amp will raise or lower both amps overall volume at the same time.

Amps CAN vary somewhat with the way the effects loops are designed, but AFAIK most will work with a master/slave setup.
 
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My 2 Markbass amps are:
Markbass Mini CMD 121P
Markbass CMD102P
20220712_112355.jpg
 
Just be sure the polarity works out correctly. If you lose low end when combining h, this is the symptom that points to polarity difference.

Whenever using outputs and inputs other than as intended, this is a real possibility.
 
I'd just use a Y splitter box to send my bass signal to both amps so I can maintain full control over both.

EDIT: or if you want a doubled effect, the TC Electronic Mimiq (full-size version) is very good for a double-tracked sound. Not so useful for standard bass, but really cool for lead-bass kind of sounds (i.e., with lots of effects).
 
Sort of related question: Can the CMD102p be used as just a wedge bass monitor?
I run a Genzler Magellan 800 rig pushing a BA 15-3 SLT and a BA 210-3.
I was thinking of running those two parallel using one Neutrik output and then a 1/4" jack out of the second Neutrik output run it to the CMD (speaker input only, not into the amp input. I see an external 1/4" jack hardwired as part of the combo, can't I just pull that out and plug in the Genzler-sourced 1/4"?
This is all after switching the Genzler amp to 2.67 ohms.