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Combining amps

So i have a a Peavey max 112 combo amp, and i was wondering what i needed to know to connect it to another cabinet, like does it have to be the same resistance or same amount of watts. I already checked the amps faq and i couldnt find anything helpful. Also, the amp has an effects out port and a line out port, which should i use to connect them? will i need to connect it to a certain port on the other cabinet?
 
I looked into the specs for this amp... I am not sure if there is much you can do with it!

It doesnt have a speaker out so that you can hook up an additional cab, which would be the ideal scenario.

It doesnt have anything that will work as a "line" out either, for an Option B that would be plugging it into another amp + cab system (meaning, you'd need a whole other amp and cab). Unfortunately the headphone jack shuts off the speaker, so you can't even use that.
 
it CAN be done, but not easily, and will still require cash and quite a bit of work. Not exactly recommended, but here goes:

find the real estate on the back panel of the chassis (removed from the combo) to add a 1/4" or speakon jack. install it in parallel (+ to +, - to -) with the leads that go to the current speaker. put the chassis back in.

that's the easy part.

NOW, you need to figure out what the current speaker's inpedance is, although i'd bet it's 4 ohm. If it's an 8 ohm speaker, you need to swap it out with a 16 ohm speaker. one that works with the existing combo's internal dimensions and sealed or ported construction (if it's a 4 ohm speaker, swap it out for an 8 ohm). you can then hook your amp up to another MATCHING IMPEDANCE cab and not blow the amp. you'll have about half the power without the second cab, but with the second cab, the amp will sound louder than it does now.

that's a whole lot of effort for not much better of a rig than the amp by itself. upgrading would make a more sense, IMHO.

i think the consensus would be to just get different stuff, and leave the amp as-is.