Pro-SW12 Subwoofer (400-4051) Troubleshooting Faxback Doc. # 31281 Q: With the Pro-SW12 Subwoofer and the LX4 Compact Bookshelf Speaker (400-4060) hooked up to the STA-2150 Receiver and the receiver cranked up to 3, the receiver stops. The speaker works fine. A: Connect the subwoofer to the B Channel with the other speakers connected to the A channel of thr receiver. It is cutting out because there are too many speakers connected to the receiver and it is cutting out to keep from blowing. (IR-03/11/96)