#1
Hey all... before you ask - I'm in a two piece stoner-rock band so I use a three way signal splitter for two guitar amps and one bass amp. Yes, it does make "quick changeovers" difficult

I used to use a Marshall JMP, Vox AC30 and any old bass amp I could borrow at gigs, with no problems, until I swapped the AC30 for a Marshall Plexi as the second guitar amp... the three way switcher I have is a DeLisle ABC splitter which has a "phase" switch on it.

Now, I don't know shit about "phasing" with amps. I had no idea amps could be "out of phase" depending on the amp. I've been winging it by swapping the outputs on the pedal for the different amps as sometimes on some outputs I'd start picking up radio signals! Or it would just buzz heaps... then other outputs it would be quiet. Very strange and beyond my knowledge. So what I wanted to ask was, what exactly is "phasing" with amps and why is it that I have to align the outputs of the pedal to the amps just right (i.e. get the right combination) to stop interference and excessive buzzing? It don't make no sense to this guy
#2
Phasing is unnecessary. They're very easy to build, here's a schematic that I made and use. You'd just have to add a third switch.

Gilchrist custom
Yamaha SBG500
Telecasters
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100


Cathbard Amplification
My band
#4
Even then. Are the amps in or out of phase naturally? Unless you go into the circuit and count phase inversions, how would you know? And then there's amp placement - that has an effect too. It's mostly bollocks I reckon.
Gilchrist custom
Yamaha SBG500
Telecasters
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100


Cathbard Amplification
My band
#5
Yeah I'd never come across it before until I started using three amps... I do use them all at the same time for about 90% of the time. Flicking the "phase" switch makes two of the amps sound either close together or really spread out... it's very minimal difference but you can tell, I just never knew why this was a thing I always just thought you plugged em in and turned them on or off! Not sure why the pedal manufacturer added the switch... is there some point to it?

Here's the pedal I have: http://www.delisleguitar.com/manuals/delisle-abc-manual-v2.pdf