I have a pair of 600s and a Rel G2, I think, the one with the smaller driver. It’s been several years since I bought it. I tried the special wiring thing with the lfe cables and resistors. I had 1000ms before the 600s. It was a real pain in the ass and never worked right. I’ve used a line out of a preamp to feed the sub and haven’t had any problems since.
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Thanks dalims4 for your reponse. Someone on another thread led me to the use of a Jesen IsoMax isolation transformer between my 600i's and my pair of subs (I purchased JL Audio E-110s). The E110 is optimized to perform best with the low level RCA inputs. So I am now hooked up as follows: Furutech Speaker Reference III cables with bananas both ends from each 600i amp to Harbeth SHL5+ speakers. 12ga. Cardas speaker cable with bare ends from each 600i amp into the high level input terminals on a Jesen SC-2NR Isomax isolation transformer. RCAs out from the IsoMax to each sub. Sounds great and is ABSOLUTELY DEAD Quiet! But I would like to try the JL Audio CR-1 crossover unit someday. Unfortunately, it's retail price is the same as my pair of E-110 subs. However, it would probably allow me to maximize the synergy between my subs and my Harbeths. Until then I can listen with what I now have and enjoy its full range sound.