Graeme, just looking at the picture and not having access to the manual(if you have it the connections should be described), I'd be inclined to agree with Jay that the other input labeled "XOVER INPUT" is the one intended to be used when a receiver is doing a crossover. So switch the cable to that input, which then bypasses the internal sub low-pass filter and makes that setting on the sub control irrelevant.
I have the manual but still can't figure it out ( Just call me stupid
)
This is what is says....
Low-Level RCA Input Jacks The two RCA input jacks allow you to connect your subwoofer to
EITHER 1.) The Subwoofer output of an AV Receiver/Processor
OR 2.) The Subwoofer output of an External Crossover.
Note: When using the External Crossover input, the subwoofer Level Control and LP Filter Control on the subwoofers rear panel are bypassed and have no effect on the subwoofer. In this mode, the adjustments are made using the controls on the External Crossover.
I figured it would be option 1?
