Pondering REL and Dynaudio subwoofers.

@dwette  sounds like a heck of a REL subwoofer array! Didn't have a grounding station but did try grounding through a couple different components.   I'd assume Rel would have a reliable solution for class D amps, but no.

It's a mute point for me now.  I traded in my REL Classic 99 for the Dynaudio Sub 6.   I'll be happy to report back here once I have it set up in about a week.

@grantgg 

Grounding can be a challenge in a system, and it can vary from one system to the next. Until I came upon my current solution I either had low level hum in my speakers or the same in my subs. Now it’s finally eliminated completely. I’m glad to now have a common ground station for the system. If I add anything that needs to be grounded I know where to connect it. I sourced a 25’ 14 gauge ground wire from Amazon for nearly nothing to make up more ground wires if I need. For now, I have no hum/buzz whatsoever.

I also have my hifi on a quad outlet connected to a dedicated circuit, on an electrical sub-panel with its own ground, separated from the rest of the house (and all the appliances and HVAC).

@gotolondon2   I have had Velodyne, JL Audio, and SVS subs. 

Which model Velodyne and how did you determine its position in your room?

I had an HGS10 and 12 as well as DD12 and DD15. I did the sub crawl method beck then. I couldn't get good results with either of the DD's on board processor.

@gotolondon2 A well experienced time with Velodyne. If something happens to my DD Plus' I'll defiantly audition the Dynaudio, thank you.

My home sub history begins in 1967 with an Octavium. The mastering engineer who sold me the sub cabinet built a gain attenuator with a single channel parametric EQ. He taught me how to locate the the rooms standing waves for sub placement (the crawl) back then.                                                                                                                                                                     

By the late 70's an M&K servo sub. In 83' I switched to 18" Velodyne subs who where just thirty minutes away beginning with the ULD. Then the F Series, HGS, DD and currently two DD-12 Plus'. Rather than meerly suggesting a "TIP" in the DD manual, after unboxing in the Plus manual Velodyne adopted the crawl as the first setup step for proper room integration.

The DD Plus was a total upgrade from cabinet, driver to software. The DD Self EQ was replaced with Auto EQ. With the Sweep Tones now on CD they're simultaneously played through the mains and the sub for very effective speaker / sub integration.

Manual adjustments were greatly simplified by the development of the Frequency Response and Parameters screen which was never reviewed by the major periodicals. Instead of making a single adjustment with the DD then exiting the program to listen to the effect with the Plus it's now done by drag and drop on the fly adjusting up to five parameters. Incredibly less time consuming and a far more productive result in presentation. As always a sub system without a remote is no fun.

All the best, cheers. M