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How do I use this slave?

Hey just a quick question what is the proper way to hook up a single knob slave amp? Im just playing with one that I havent ever used. Im using 2 cabs and its a sunn concert bass and a sunn concert slave. Im thinking of getting rid of the slave and would like to test it for function.
 
Hey just a quick question what is the proper way to hook up a single knob slave amp? Im just playing with one that I havent ever used. Im using 2 cabs and its a sunn concert bass and a sunn concert slave. Im thinking of getting rid of the slave and would like to test it for function.

Patch the head's preamp out to the slave's line input. Connect speakers to the speaker out of both amps. Adjust the slave's volume to match the head's volume. Rock out!