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I have two Half stacks, one Marshall and one Kustom. My question is can I plug the two heads into each cab?

What I want to end up doing is have an ABY switch from my guitar straight to the Marshall head, and then the other goes to an effects processor, and have sound coming from both cabinets at the same time.

Are there any problems that I could/will face having 2 heads into a single cab? And should I just go with the ABY switch to each half stack as it is

I want to be able to use one head at a time. When I'm playing some nice classic rock, have my switch to the Marshall head, and then if I come up on a song that needs effects switch over to the kustom head that has an effects processor on it. So one Head driving both cabs at the same time, only one head at a time.

The stacks I have are:

Marshall 1987xl 1960bx Kustom 100HD kustom 4x12 cab

anything else that you need to know just ask and I'll try and provide the info.


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WARNING: Do NOT plug both heads into the same cabinet as it can do serious damage to the heads.

The trick of re-wring the cab so that you have two independent sets of two speakers will work fine. However I would recommend doing the left column and right column and not the bottom or top row. The bottom row sits very low so as a player you will not get any high frequencies. It will sound very dull to your ears (but it's screaming at your ankles), while your audience is probably already writhing in pain. Even the top row is actually not high enough unless you get at least 6' away from your cab.

If you chose to do this, you need to analyze the wiring for impedance. If your cab is rated 4 Ohms than you either have 4x16 Ohm drivers in parallel or 4x4 Ohm drivers in a serial/parallel configuration. If it's the first: wire the two speakers in parallel. If it's the second, wire the two speakers in series. In either case you will get 8 Ohm impedance (which is fine). If you get this wrong, you'll either end up with 32 Ohms (very low sensitivity) or 2 Ohms (likely to damage the head), so some care is advised.

There is a device that will actually do all the required switching for you (including multiple heads and/or cabs). See

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This can be straightforward, the one caveat its that you can't wire both heads to the same speakers in a cab.

So what you could do is wire one head to 2 speakers in a cab, and have the other head wired to the other two speakers.

It isn't ideal though- it's usually better to keep them apart. Is there a reason you want to do this?

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I was curious being there are 2 inputs on both cabs.. I like the sound I get from 2 cabs vs 1, but I only want one head operating at a time Thats why I would have the ABY switch on there.. So one head for 8 speakers, and then use the switch and it would be the other head driving them. – Joe W Jun 4 '12 at 20:58
Oh, I see- that would be really easy then. I thought you meant both at the same time. – Dr Mayhem Jun 4 '12 at 21:55

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