Subwoofer working through phono, but not ext. decoder

[706crew]

I have a Yamaha AV Receiver (RX-V496) with a sub-woofer and two monitors. I have phono set up with a turntable, and the sub works fine, as do the monitors, but when I swap it over to ext decoder, which has my computer outputting audio, the monitors work, but the sub does not.

Edit: I've pulled out the cable from the receiver and touched the chord, and the subwoofer does in fact work.

 

[americanaudiophile]

Use a different input. EXT decoder bypasses the receiver processing so the sub won't work with a 2 channel input. Use any analog input such as VCR instead.