What Power Cords for Rel S510 Subs?

i used as good a power cable as i could on the s510 and it improved with it.  it also loved isolation.  imo alot of noise is around the bass frequencies and so removing power line noise is a priority and so is using a litz power cable that reduces noise.

for testing i'd suggest you'd need to leave it in for a time and assess more on that basis.  i would not at all be surprised however if you have to re-do levels.  the reduction in noise floor will elevate gain significantly.  i suggest you trial a dragon if you can (since i presume you are in the US).  however i also upgraded the speakon cable to a "blueline" from rel i think they are called.  that made a big difference and was much cheaper than a dragon.

in aug stereophile magazine Mike Fremer relates a story of a guy selling 4k USD speakers and demoing them with 8k worth of dragon cables (powered speakers). mf says "why the hell r u doing that".  guy says "they make the speakers sound so much better i had to" 

knowing what i know now, a good start to a system would prioritise power over everything else.  no fancy anything until the power is as good as it can be.  

Power cords often have more impact than any other cable. Claiming the opposite means two possibilities:

-1) you haven't tried the right power cord (30$ no-name cord from eBay or Amazon usually won't do the trick)

-2) you haven't tried at all (most likely answer, you know who you are)

I don't see why the RIGHT power cord wouldn't improve a subwoofer. But you may have to try a couple different ones in that location.

To follow up on this thread, I finally got my Rel subwoof... I mean, "sub-bass systems". Carbon Specials.

They sound superb with their stock power cords which are currently plugged in, but I will upgrade them soon as things can always sound better. I’m going to see if I can get a pair of 3M Audioquest Thunder cords, and a pair of 3m Hurricane cords, as demos to see if the cord quality actually matters. Truly hoping it doesn’t make a difference and I can go even lower grade. Despite the fact that I am firmly on the side of power cords making a big difference that is easily and blindly discernible on a revealing enough system, now that I have a bit of experience with my Rel’s, I’m not sure power cords will matter as much for subs. I have two reasons why this is my expectation, prior to testing:

• After correctly tuning and positioning my subs, meticulously checking for correct integration and balance with my main speakers, I tried playing them at normal volume with my mains disconnected. The subs are just whispering! It’s amazing that slight of a sound makes that much difference. Given that it’s just a mere whisper of supporting bass, I can’t see how power cords matter all that much.
• The upgraded Baseline Blue Speakon high level input cables which I purchased are comparatively cheap. If the signal cables are that "cheap", it seems like it would be weird to spend much more on power cords. These signal cables are even used with Rel’s even higher grade reference speakers. I don’t hear of audiophiles going crazy on higher level input cables for high end subs, so I really don’t see power cords being all that critical for subs.

I did find an old thread where the poster claimed that upgraded power cords helped his subs, in particular and surprisingly helping the mid frequencies and vocals. I am really, really hoping this doesn’t turn out to be the case for me. I have other uses for the cash!

I upgraded my Baseline Blue Speakon high-level input cables on my REL's by building my own cables with better wire (Meddiabridge 12 gauge) and Neutrik NL4FC Speakon cable connectors. Definitely an improvement in sound from the REL subwoofers at a fraction of the cost of purchasing something already built. I also purchased custom-built (inexpensive) 10-gauge power cords which as far as I'm concerned was also an improvement (12' long each). I simply upgraded to a 10awg 99.99% pure OFC copper using a good IEC and AC plug, all cryo-treated.