Modify Magnifi X sub for lower output

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I haven't opened the sub yet, but I'm curious as to the best way to simply reduce the overall output of the sub.

I have this soundbar/sub set up at my mom's place, but at the lowest volume setting, the sub is somewhat loud for her liking.

I agree it can get slightly boomy regardless of where I place it, for me...its fine...however for her I'm going to try to reduce the output for more of a fill to compliment the soundbar.

Would a simple resistor on the positive lead work? I dont want to change the slope or crossover characteristics but just the output volume.

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