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So basically I'm using the preamp of amp 1 into the power sections of amps 1 and 2, via a multi FX.
The master volume on amp 2 depends on where it is in relation to the FX loop, but if you're in the front end anyway then yes it will come into play.
Two ways I used them, firstly guitar into a delay pedal that offered stereo delay with two outputs, setting one feed to below 50ms and the other to the other amp between 50-100, in a one guitar band it really thickens the sound up, just using the amps and their onboard reverb and foot switch changing channels and an ABY switch to select either or both amps at once.
The second way was just to have one amp set slightly on the edge of breakup or mild drive on all the time with no fx and the other amp 'wet' with all the fx and drives into it and just using that for different tones. The first amp just adding something to fill the sound out.
Just have a play and see what works for you. There's loads of ways to combine two amps, through ABY switches, through fx pedals with two outputs etc.
I've probably been lucky but never suffered from any ground hum issues, but a good ABY switch will have a ground lift and one isolated output.
Space on stage may be a consideration, having two combos may not be feasible with smaller stages. I've got a compact 212 cab that can go mono or stereo with two different speakers suited to the amps and two heads that go on top, keeping your footprint smaller, but being taller increases the risk of drunks knocking them over or you pulling them over with your cable.
So I have a Marshall jcm 800 2204 with no fx loop, a jcm 900 dual reverb head and combo (both with fx loop) marshall bluesbreaker combo no fx loop, marshall valvestate 8080 with fx loop and an orange ad30 combo. Can't remember if the orange has a loop or not. I have a lehle aby pedal and a suhr iso pedal I bought a while ago but never really used. Also have a boss dd3 I always use. Also have a fryette power station 2 that I use for the bluesbreaker and sometimes the jcm 800.
It’s great fun and I found the best results for me we’re to run the one amp with effects and the other dry. Using lower gain settings and slightly lower volume on the second ‘dry’ amp I had much better results
I had a ground loop issue which the box sorted but no phase problems however the box will fix that too. Also has a buffer built in
Either split before the amps - then you can have different amounts of gain if you like, or split after one preamp and go into an effect return/power amp in so you could have more spread/ different or stereo effects.
I usually just go out of my effects into the amps but if I’m using a modeller like the fractal then I’ll go into the effects return.