I'm getting a hum in one of my E15's. Both are hooked up the same. I've checked all connections and everything is secure. I have two connections, as follows:
1. Rogue RP5 --> dSpeaker 8033SII --> E15 Line In
2. AVM70 --> miniDSP Flex --> E15 LFE In.

I disconnected the cables at the intermediate (dSpeaker & miniDSP) and the hum persists.
I disconnected both at the E15 amp and the hum went away. I can plug either one back in (eg feeding LFE or feeding Line In) and the hum comes back.

Any suggestions? Amp going out? Possibly two bad cables?

I then disconnected the problem sub and hooked an old CD player directly to the Line In on the sub. Played some music (bass ;-)) and no hum that I could tell.

Over the next day or so, I'll try swapping sub cables to see if the hum moves from one sub to the other. Will likely also try disconnecting everything and hooking back up one at a time to see if/when the hum is (re)introduced.

I also emailed Rythmik via their website contact form to see what they suggest.

In the interim, wondering if Dave or anyone on the Ascend forum has any suggestions.