Did they tell you the hum was from the sub? What did they say they did to correct it?I have this sub and have never had any problem with noise of any kind. My settings are-Level 5, 250 at 0, 45 for the crossover. This is in my dedicated audio room with CLS11Z speakers. The room is quite large40x30x8. The hum may have been elsewhere in the loop,2 defective subs is more than bad luck.Check the screws on the woofers maybe they have come loose thru shipping, servicing or volume.
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