Power Cables on Subwoofers do Matter

Yes, I agree @lak that mileage WILL vary based on multiple conditions, one of which being the exact power cable used. I can only provide testimony about my sealed, 500w rms, class D powered sub which is plugged into a power conditioner outlet that provides up to 55 amps of current when needed. The sound quality of the sub was audibly affected in different ways by each power cable I tested, which ranged in price from a few dollars to about $800 (most of which were in the middle of that range).

As far as the response from REL, I’m really not interested in what most manufacturers would tell their retail customers regarding sonic changes due to power cable upgrades. It’s usually not in their financial interest to suggest that may sound significantly better when the power cable is upgraded, potentially implying to certain customers that’s it inadequate as sold.

I have a high level of confidence in my own subjective discrimination of sonic attributes, so what the REL guy said makes no difference to me, personally.

@steakster Totally agree that precise phase adjustment is crucial to integration, along with crossover and volume.  I think it's a baseline thing for the total system's sound.  If it's not properly integrated, especially with phase (in my experience), then power cable upgrades won't have the potential to be anywhere near as advantageous.  

Worth noting again that I found isolating the sub by turning off power to the loudspeakers to be very important for the conditions needed to be able to choose the best power cable.

Strange...my Pair of REL T/7i subs improved with my upgraded 10 gage copper power cords.

A couple of years ago there was an article on another audio site (PosFe), that I can’t seem to find right now (maybe someone can), that said that improving the power cable to the sub not only improved the bass, but also the higher frequencies. I had already swapped my stock power cord to my Martin-Logan BF210 with a Signal Cable I had lying around to good effect, so I decided to move higher up the food chain, as I could always use more midrange clarity. I got a significant increase in clarity and resolution across the entire range of frequencies by replacing the Signal Cable with a Shunyata Alpha v2. Was very happy with the improvement. Like we often say, it seems everything matters!!

This is a servo plate amp, LOOK at what you really need to do it right along with complete speaker decoupling from the entire room. A Turntable delight right down to a flat as a pancake 20hz or lower sub responce. NO woofer pumping AT ALL ever..

Plug a crap PC into this amp, you'll hear it.. 

Normaly when manufactures make a statement like couple the sub to the floor or power cables make no difference, that type of sub manufacture/owner likes to FEEL the sub through their bottoms, feet, and that type of thing.. They kind of loose the plot when it comes to TOTAL distortion and distructive harmonics and effects on all the other gear, not just "their" sub..

It's very districtive to super clean MB, mids and high drivers too. Vibration is vibration.. It dosn't mater what it's rattling. It also delivers a delayed responce way out of time with the actual drivers and the rooms reflected responce.

I like a ground UP approch other than TAME an issue after the fact. Plates falling off the walls, kitchen cabinets rattling.. I know glue them to the wall. ALL FIXED. :-)

Regards