I did message RIchard V. He did respond very quickly. Suggested I leave both the NAD and the 2Wq on all the time. Said both would last longer if I did so. The obvious and quick fix. I was just curious as to why it hums.
Subwoofer hummmmmm
Running a Vandersteen 2Wq sub, connected to a NAD 375 Bee integrated amp. The sub is plugged into its own electric socket. Vandersteen recommends it be kept on all the time. When the amp is turned on, no problem. When the amp is turned off, the sub emits a low hum. All thoughts, suggestions welcome.