Dual Subs set up advice

Scousepasty, so to understand you... you feed from the high voltage speaker terminal to the low voltage RCAs on the subs? Or do you mean you run RCAs to the amp and you Y off them to the RCAs on the subs? Or...from the high voltage speakers post you run to the speaker level in on the subs...

At the moment, I run them like the the last option via high voltage but thought it would be just as well to run RCA from the preamp.

I have dual NHT subs, and related NHT SS dual amps. I have three systems, each with separate pre amps. One has dual amps outs, one a sub out, and one with only tape outs. I route all of the outs to a Chase RLC remote controlled unit as a switcher that goes to each of the NHT amps. I do not use the NHT amps to feed the three different sets of speakers that I use individually, all driven by tube amps. Since the line out of each pre amp is different, the Chase unit's remote is used to adjust the output of the NHT sub amps. Works well, gives a lot of flexibility. For WAF purposes, each sub is in a front of the room corner, but I have been testing various other placements. Nothing finalized yet.

I use an Audio Control Richter Scale crossover for a similar setup. It has a built in EQ for the bass level and this helps a lot in balancing the setup. It operates at pre-amp level only however.

Sorry for the confusion NAk, I use a standard speaker cable run between the speaker teminals on the sub to a piggy back RCA's into the main speaker teminal on the speaker. Left sub to left speaker and right sub to right speaker.
It does show how to do this in the ML Descenti manual.

Scousepasty, you have RCA jacks on your speakers? Do you mean you run lines in parallel from your speaker input terminals to the speaker level in on the sub?

The way I am running my cables is essentially the same, in parallel.

NAK8