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I might be wrong but it seems like evtime I put in thicker cords such 7 to 10awg in my class-D JRDG, it (seems to) gain more dynamic & aggresiveness but less musicality and soul than the 12 & 14awg aftermarket ones. The stock one is ok, but, to me, it sounds kinda close-up, flat, and boring.
I'm curious how a 600wpc class-D sound. What brand is that? If I want that much power, I'd probably won't want a class-D one ... unless I get to hear one first.
I don't know if this will help you but I have a 2 channel Class D amp made with Hypex UCD-100 modules. I used the following power cords with it. A stock 16 AWG cord that came with my PS3, a stock 14 AWG from another amp I bought, Volex 17604 PC and an Atlona 10AWG power cord with fancy connectors on each end. With each cord I didn't notice any difference sound wise good or bad.
Now all the gear I used with this amp along with the amp falls into the "budget" category so that may be the cause of me hearing no difference in sound.
Good luck with the search.
I used Shunyata Annaconda Helix on my Red Dragon Leviathans.
These gave me the best sound, compared to other PC that were DIY or name brand.
I think the bad rap given to D amps is because those who didn't like the sound used no upgraded PC or did anything to the power.
In my expereience,D amps perhaps are more susceptible to dirty power than most SS and the more forgiving tube amps.
They will let you hear what you are feeding them.
I can highly recommend the new power cables from High Fidelity Cables. They perform like now other cables I have ever tried in my system. Of course I have not tried all of the other brands but I have tried a cross section of power cables over the years and the HFC are in a different league IMHO.
I am using them with my Merrill Audio Veritas Mono Amps.
Correct me if I am wrong but I believe that class D amps do not have power supply caps used for storage ... so it may behoove users of this class of amp to go to a larger gauge power cord to act as a temporary reservoir on high current demand passages
The larger cable wouldn't be an actual reservoir as in storage but a bigger cable would allow for more instantaneous deliver on strong peaks
With the high efficiency of the class D amps you will probably get a 16 or 14 gauge power cable from the factory ... increase it to 9 gauge and reduce the restriction if and when a peak in the music calls for more instant current
I wonder if those who have had success with after market power cords on class D amps did so from the after market power cord being a larger gauge ??
This is an interesting point RE: class D power reservoir success. One aspect of my rig is that the power filtering components that I use are intended for live performance in venues with poor house power. They store up juice -- apparently 40 amps. I'm not an electronics guy, but this potentially supports your hypothesis. Dunno about the power delivery specs or gauge on the Wireworld Electra 7 cables. They are odd and flat.
Have been running the Shunyata Venom 3 from my Rotel RB1572, (Class D) to PS Audio P10. The P10 runs from a PS Audio AC3 Power cable, (3 Feet) to PS Audio Power Port Classic Outlet. Running Shunyata Snakebite from Superphon CD Maxx, (Preamplifier) to P10. Without changing settings on P10 since connecting these Power Cables for the last 8 months I have noticed a greater 'blackness' for lack of a better way of describing it between tracks and a very lovely decay at the end of particular favourites that I did not either notice prior to the connection of these cables, maybe (placebo) or they have broken in very well.
I definitely noticed a difference when I upgraded my power strip and power cords that feed my class D crown amp. I went from a crappy surge strip to a diy box with 10 awg wire, filtering caps and Hubble non ferrous outlets. That improved the sound. Then I built a 10 awg power cord for the amp and that improved the sound again. I do think the larger diameter wires allow the power to flow more easily, which would make sense since resistance is reduced as conductor diameter increases. With both upgrades I noticed less noise, more dynamics and more/smoother bass.
The only time I investigated this question was regarding my REL sub. REL said they did extensive testing and do not see a benefit in higher gauge or quality cables. I did my own A/B test and did not hear a difference. It may be that a subwoofer is too far outside your question to even bear upon it, so I mention it in passing.