You should not use your sub to adjust crossover if you have a surround receiver. Set the sub to as high as it will go and set the crossover in the receiver. Then, you don't have to worry about the signals being produced in both speakers.

Also, (hate to bring it up again), although the M80 is *capable* of reproducing 34Hz, it will produce it about 6db less than the EP500 will. So, yes, it will reproduce it, just at 1/4 of the output power.

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