REL T5i Subwoofer Hum issue

Be certain the amp and subwoofer are powered from the same outlet. 

millercarbon

You might also want to read up on the reality that all low bass is mono. Theoretically there might be some recording somewhere that is not. In practice no one has ever produced such a thing.

Nonsense - even though it’s a claim commonly repeated - and I have recordings to demonstrate it. They’re consistent with the science of stereo LF - so you might want to check the references I previously provided to you. But again, if your system is wired for monophonic bass, then of course it will never produce stereo bass.

On the subject of stereo LF, you might want to review this thread that quotes Richard Vandersteen:

Modern sources such as streaming, CDs, DVDs, digital high-resolution music files, and Blu-ray Discs maintain full stereo separation to below 20Hz. Summing the channels into a single subwoofer reduces or cancels all the low-frequency information containing phase differences between the channels. Stereo subwoofers reproduce all of the bass information complete with the phase differences that help provide the imaging and location cues we use to place people and things at distinct points in the sound field.

Yes, a lot of stereo LF involves phase differences, as I’ve already explained to you.

I still don’t know why you’d suggest reversing system inputs (or outputs) to determine if a recording is stereo. There are easier ways, such as using your preamp’s mono switch. Of course, not everyone uses a preamp and not all preamps have mono switches, so while you may not have many alternatives, many do.

This is such an elementary first step standard trouble-shooting thing to do I just assumed everyone here would know about that. So okay, thanks for reminding me, lower the bar.

I understand that insulting others makes you feel "better," but you should know that an ad hominem attack is a basic form of logical fallacy. Your illogic simply reveals your fuzzy, disordered thinking. It joins your claim that "no one has ever produced such a thing" which is also a logical fallacy, because it’s logically impossible to prove a negative. Not that it matters much in this instance, because your premise is demonstrably wrong.

A Rel Arro should fix the ground loop issue that you are having.  My buddy had the same issue with the T9i.  Pm me if you want to buy an arro...

Not quite sure how all the bickering is helping to resolve the ops ground ( assumed ) hum issue?

Would be nice to know the amp the op is using to drive the Rel.

Guys, thank you all for the feedback. The mono vs stereo issue was very interesting since I've always wondered about that. I may want to get a second sub for stereo bass then, assuming that means it may sound even better? Thanks for sharing that info.

I was able to solve the problem. There were two tube amps. One was a 2 watt Decware SE84UFO and the other, a Bob Latino Dynaco VTA ST-70 which I switch to for various reasons. The Decware was getting the hum while the Dynaco was not, so I just moved the Decware to a different location and the hum went away so I'm guessing some interference? I'm using an Erhard Audio Aretha tube preamp and a pair of Heresy II's. 

This REL is absolutely stunning in tight bass as well as low end extension. The REL's red wire is connected to the positive right speaker channel of the amp while the REL's yellow wire is connected to the positive left speaker channel. The black wire is connected to the left negative speaker channel per the instructions for my stereo setup. The issue was originally caused from the right positive channel.

I heard that if I get a second sub, one for each channel, the ideal setting is to connect each sub directly to the input of the speakers? Not sure of that's true but so far I'm overwhelmed with amazement on how incredibly good this whole things sounds now with the REL. It may be worth getting a second REL sub? 
Thank you again