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Was hoping you audio experts can help me understand why my setup is not functioning correctly with my subwoofer. I'll try to describe everything as simply but detailed as possible. -Turntable hooked up to stereo receiver. Turntable & receiver have no preamps built in, so turntable is routed through an external preamp (ART USB Phono Plus) -Speaker wires run OUT from the stereo into the SUBWOOFER, OUT from sub into Left/Right speakers (there is no direct SUB OUT line on receiver). -When playing records, subwoofer gets NO bass (or ALMOST no bass). If I turn receiver volume up louder, sub just gets awful LOW RUMBLE throughout song. Even with the "LOW CUT" filter enabled on preamp, it has no effect on this rumble. -Strangely, when I adjust the Balance from Center to full LEFT or RIGHT, the sub kicks in and sounds normal. But nothing at Center. -Subwoofer sounds normal/great on OTHER receiver inputs (like playing from iPod) so it seems like a turntable/preamp issue. Any ideas what I'm doing wrong?? Thank you for your help!