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Phase issues are a possibility but will vary with equipment and where exactly they are placed in the room, etc. If you are using the same two amps in the same location, an easy fix to swap the phase of one amp is to flip the two connections over on the speaker.
I've run a stereo setup occasionally using a stereo delay pedal (and an Orchid isolator if needed) without any problems.
Hi there. I am having an issue with this currently. I have a fairly complex pedal board which 2 stereo pedals at the end of the chain of which I have recently been splitting out the L and R outputs into 2 different amps. It sounds great when I'm playing but there is a very distinct hum when I'm not playing. I understand the phasing issue can be resolved with and ABY switch if I had a mono signal but obviously this isn't possible with a split L and R signal. Is there a switch than can sort this? I'm not sure/confident I know enough to 'flip the connections' on the speaker. FYI, one amp is a Laney VC30 2x12 valve amp, the other is a Fender mustang solid state amp. I am looking for another identical Laney eventually (is the phasing not likely to be an issue if its the same amp??) Cheers
Better featured ABY pedals will have the option to isolate (or lift the ground) and flip the phase of one output. I'm not sure what stand alone phase changing boxes are available - I think Radial do one but they are pricey, Maybe Bright Onion could custom build something? Or a DI box?
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I've done a quick search and found this Palmer box which would do it.
Alternatively, anything which has balanced outputs could be used to flip the phase. A balanced cable is basically two signal lines (in- and out-of-phase) and an outer screen - the two signals are normally combined at the input (and thus removing any rf noise picked up by the cable in the same manner as a humbucker works) but you could tap the positive or negative phase signal only with the correct cable.
In my experience, though, phase issues are less of a problem than ground loop issues when using two amps.
[edit] This article may help.
By far the cheapest method is to flip the speaker connections (since you have no 'screen' you need to maintain like on a signal cable)
The only drawback is i can't use it inside a loop as that would effectively prohibit the stereo outputs. Although it could be used to turn off the second amp (no signal goes to it).