Agreed\n\nIf it was a brick wall filter. But because it's a slope, the sub will still be getting signal for frequencies above the crossover point (though at progressively lessening amplitude).\r\n\r\n\r\nThe point I'm trying to make is this,, I would think that the filter on the receivers effect the signal first before reaching the filter of the sub itself. So if dialing a cutoff frequency at the receiver say around 80Hz, dialing the sub around 90 Hz will have very little affect as the 90 Hz is already being dealt with by the receiver's low pass stage. Secondly phase becomes an issue because every filter be it low, band, or high pass introduces phase delay (don't want to use the word distortion hear cause I don't know if its technically correct). Unless you have a contioulsy variable phase control on your sub ( which mine does not, just 0 and a 180 degrees) your gonna find it harder to dial the sub in properly. \r\n\r\nThe kind a fiilter that is being employed as the low pass will also determine how difficult it will be to dial in the sub as well. Some filters have an emphasis on keeping the phase shift to a minimum at the expense of an even amplitude response while others trade off phase for an even amplitude response (Butterworth) .