I just recently upgraded my sub to a SVS CS+ and am using a Carver TFM-6cb amp to power it. Previously I had plugged my sub into the switched outlet on the receiver (Yamaha HTR-5460) which is rated at 100W max. However the Carver manual states it needs 500W. Is there something available that would allow me to plug a relay or some sort of trigger into the receiver so I can just leave the switch on the sub in the 'on' position? I'd rather buy something but would be open to a DIY approach. Anybody have any suggestions? Thanks.