Well I don't know I've seen there's three ways to plug your sub, single rca (lfe) , rca (white and red), and using speaker cable. I don't really get the difference. Sent from my SM-G900V using Tapatalk Depends somewhat on the gear you're running the sub with. Usually all you need is a single rca connection to the sub's LFE input when using an avr with bass management with a sub pre-out; generally the only thing the LFE input on a sub offers is a bypass of the sub's built-in low pass filter (usually that's all a sub has even if they label it "crossover"). Some pre-outs with low output might benefit from using a splitter to use both rca inputs on a sub, usually there's a 6dB gain advantage connecting this way (and you manually turn off the low pass filter/crossover on the sub if using an avr for bass management). Some old two ch gear may not have a proper sub pre-out (or any bass management) and then you can use both the L/R connections and let the sub sum it to mono. Some old two ch gear may not have even rca pre-outs, and then you might find the speaker level connections your only way to go...
