What would happen if I attached the LF post of my Klipsch RF-7 to the "subwoofer out" from a amplifier or A/V receiver? Do you think it would ruin the woofers as they will be getting a subwoofer signal?
Er, the subwoofer out from a receiver or processor is not amplified and wouldn't make much noise. If you sent that output to an amplifier then to the RF-7s... sure, it would work and there'd only be a chance of damaging them if you played something very low and loud. You'd just be listening to the speakers playing the bass only. If you want to drive the RF-7s full range with the LFE signal included, you can set them to large and tell your processor you don't have a subwoofer.