Ok just need to clear a few things up to be sure. My DSP (Roksan Caspian) has the option to defeat the sub output and send signals below 100hz to the two front speakers. This is how I have my REL St3 plugged in at the mo with the High level Neu cable. But what would happen if I enabled the sub output and ran another RCA to the lo level input of the sub, does this mean in 2ch I would lose the frequencies below 100Hz (as they're rerouted), or would the DSP know to use the sub output for 2-ch music too (and 5.1ch)? The manual for the REL says for 5.1 to enable the sub (LFE) output etc but it's getting me confused now, should I just leave it as is? This is an extract from a setup guide: It says to ALSO run a cable from the LFE connection (assuming it means sub). On my DSP I can't do both, if I turn the sub output on it cuts the low frequencies out from the main speakers etc. Hence my confusion.