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Help about bass cabs

So i have a rumble 75 combo amp (off the new line) and i was wondering if i bought a GK 2x10 cab, would i be able to use the line out on the combo amp to power the GK cab, or would i need to buy another head, or could i use my boss me20b to power it...
 
I am not familiar with that combo, but generally speaking, a line out is just for interfacing to other line level gear. This could be a line input on a recording device, an effects box or a power amp. You could also for instance plug it into another amp. Lots of amp heads and combos have "pre out" followed by a "power amp in" By using a power amp in on a 2nd amp you would be bypassing the preamp/eq of that 2nd amp, simply utilizing the power to bring up your volume.
The me20b is simply an effect pedal, so it can be viewed as a preamp itself.
 
The others are right. You can't use an unpowered cabinet without a speaker extension output on your amp. The effects unit doesn't have a power amp either.

If your goal is to increase the volume/speaker area of your Rumble amp, there is a solution....what you need is one of two things:
1) A powered PA speaker--go from the DI/line out of your Rumble into the powered speaker. You can then still go to a mixer from the powered speaker.
2) The other alternative is to buy a power amp and bass cabinet, then go from the DI/line out of your rumble into that.

**Another alternative is to just buy another amp...even another Rumble 75, then use a stereo effect pedal to run into each amp input.