Hi, having a problem with my Sony STR - DB790 amplifier. All my surround sound speakers work fine, but my subwoofer is not. The subwoofer has power and is connected using the co axial cable. The subwoofer is also new and in working order. HELP please. Thanks

No their is no sound when I do a test sound. All the other 5 speakers are working, settings are setup to show a subwoofer is connected. Thanks No their is no sound when I do a test sound. All the other 5 speakers are working, settings are setup to show a subwoofer is connected. Thanks

How do we know the unnamed sub is CAPABLE of making sounds and connected properly? Was it working before and spontaneously failed or is this new equipment? It matters.

Prove its amp will respond to an input by running an RCA feed to it from , say, one of the MD/Tape, Video 1 or Video 2 Outputs. be advised these outputs are NOT volume-controlled so it will be loud if it works. If your sub has volume control, turn it down. Select FM, tune a station and be ready to de-select it. If it still doesn't work, the sub is the patient, not the receiver. How do we know the unnamed sub is CAPABLE of making sounds and connected properly? Was it working before and spontaneously failed or is this new equipment? It matters. Prove its amp will respond to an input by running an RCA feed to it from , say, one of the MD/Tape, Video 1 or Video 2 Outputs. be advised these outputs are NOT volume-controlled so it will be loud if it works. If your sub has volume control, turn it down. Select FM, tune a station and be ready to de-select it. If it still doesn't work, the sub is the patient, not the receiver.