Powered subwoofer impedance


Am a rank layperson so please pardon my stupid question!

 

My big old Marantz amp died recently and am looking around for a replacement, so need to be aware of power@impedance factors.  From one set of amp speaker terminals I run via speaker wires an old M@K v-75 mk2 powered subwoofer, which in turn powers a pair of 8 ohm RBH MM-4 satelites.  From the other set of amp speaker terminals I run a pair of 8 ohm old Bose 601s.

 

My question is:  What impedance should I consider my subwoofer to be running at?  Can't find anything about this in my M&K owners manual or anywhere else.

Thanks,  Mark

 

 

wandermark

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