I have two subs in my setup. Here's the wiring scheme: Sub out on my 1070 is wired to my SuperNova's "Left In" RCA jack. The interconnect is a simple, no-name brand standard audio cable. It's actually pilfered from the fairly heavy feeling cables that Comcast brings out when they do a new STB installation. It's about an 8 ft cable.

I run a standard Acoustic Research "actual sub cable" from the "Left Out" on the SuperNova, into the basement, and back up through the floor to my Fathom F112. It's a 25 ft cable.

I had calibrated my Fathom connected directly to the 1070. That was possibly a mistake. I'm not sure.

Problem: I noticed the other day, I thought the Fathom was a bit quiet listening to a certain piece of music. Generally when the 2 subs have their master volume set to around the same position, I notice that the SuperNova is much louder than the Fathom. This is not what I would expect. The two subs are each in a corner of the room.
As a mini-experiment, I removed the Supernova from the equation and ran the 25 ft AR sub cable straight into the 1070. I realized a fairly significant gain in the output from the Fathom. (I can't be 100% sure if this is my ears, something with the acoustics of going from 2 subs to 1, I don't know.) The Fathom seemed to wake up and the output was much cleaner than the Supernova (no surprise there.) I actually contemplated leaving just the Fathom in the config but I do like the more even distribution of the bass with two subs.)


If there is a real issue with the daisey chained config, I can only guess it's one of three issues:

1.) The Supernova manual recommends using a Y adapter (1F/2M) at the sub to split the single sub cable coming from the receiver, for "optimal performance. Perhaps me using only the Left In is somehow cutting out some of the signal as it's passed on to the Fathom? There is a Right Out (as you might suspect) next to the Left Out that I'm currently using. I could potentially pick up a Y adapter to fill both INs on the Supernova, and another 25 ft sub cable, run the two cables to the Fathom, and then merge them back to 1 M RCA before hooking up to the Fathom. (JL recommends only using a single sub in.)

2.) Less likely, the "el-cheapo" sub cable I'm running to the Fathom is causing part of the problem? (Side question: In general, am I jipping myself using a standard off-brand audio cable to send the signal to the Supernova? I'm unsure of the difference between a standard audio interconnect and a "sub cable"). I have no humming issues as it stands.

3.) Possibly the Supernova's pass-through is just lousy and I should be running the JL as the Master in this config...

There's lots of things I could see being an issue and it could be a combination of things I guess. I have about $200 burning a hole in my pocket and I'm interested in fixing this issue before addressing other cable upgrades. Any suggestions would be greatly appreciated (as always.)

Thanks!