There is an error in the PSW10 owner's manual, there isn't an LFE input on that model. However, that shouldn't be a problem. All you would need to do is connect the single sub-woofer output, of the receiver, to either the right or left input on the sub-woofer (the sub-woofer's bass amplifier adds the two channels together so a connection to either one is fine). Or, if you prefer, you may use a "Y" cable to provide a connection to both inputs on the sub-woofer. While this doesn't change the sound quality it will allow the sub-woofer to play louder at each of it's volume control positions.
The second thing you would need to do is set the variable low pass filter, on the sub-woofer, to the highest setting (the variable low pass filter is the dial that has "Hz" labeled). This will set the internal low pass filter above the low pass filter frequency given by your receiver and, in effect, create an LFE input. If you have any questions please telephone us at 1-800-377-7655 and we'll be happy to help.
Regards, Ken, Polk Audio