Another note...my initial non-working woofer prompted me to call Silverline and talk to Alan Yun...THAT was cool and he told me, among other things, to not bi-wire them, don't lose the jumpers, and he'd sell me another woofer no problemo...weirdly it seemed the offending woofer had no sign of EVER being hooked up (properly anyway), and man...these speakers do NOT like using one woofer.