In the other thread and here, some things I'd like to comment on:
1) "...how much smaller (physical size) the Marathon is stacked with the CV..." Both amps a 3RU and virtually identical in physical size.
2) " ...the CV tested out WAY better..." But, you show no test results in the real world of your own environment (source, room size, signal chain, Speclab graphs, FR graphs, peak meter reading, etc.). So, what the heck does way better mean?
3) You show the opened CV but not the MA when the MA is sitting right there. Can you do a side-by-side?
4) As John (LTD) points out the energy stored in a capacitor is proportional to the capacitance and to the square of the voltage across the capacitor
, so if your comparison is of just the number of caps with no additional info, the comparison is useless.
5) "... most quality issues don't relate to caps...pssr... noise..." This is patently false. Capacitance reservoir requirements are proportional to frequency, rising as frequency decreases. Since both amps are directed at the pro sound market, they use the age-old 20-20k Hz spec, and many, of course, cheat that requirement in their low end amps. So, the only way to tell if the cap reservoir is up to HT subwoofer standards (depending on the subwoofer system used) is to test it using actual program source.
I did just that with the AA V6001, Marathon MA-5050 and an FP9000 clone.
I started with WOTW in my 3500 cubes room, subs at 4M from the mic (measurement system flat to 4 Hz) and system calibrated flat, FR at (+/-) 3dB 3-120 Hz.
The AA was 1st and it immediately died. It was sent off for repair and the comparo was delayed until it was returned. This AA amp was tested by Chas, but it died during testing as well, he sent it out for repair, it was returned to me because Chas didn't want a repeat. It was returned to me severely damaged by UPS and AA sent me another amp. It also immediately died with the same scenario and program source, so I pitched it into the amplifier crap pile in my attic space and never looked at it again. The AA amp is 90-95#, IIRC, showing that looks and weight are irrelevant. It may be the cat's meow for >30 Hz (dub step, kick drum, whatever), but it's useles as the power plant of a full BW HT subwoofer... end of discussion.
I then proceeded with the test using the MA-5050. It blew an on-board fuse. I replaced the fuse and tried again. It again blew a fuse. After seeing that the amp could not handle reference playback of <6 Hz source, I selected a scene that had relatively little <10 Hz but with strong 10 Hz and up, from The Hulk.
There are nuances that give a slight edge to the clone with this scene, but they are inaudible differences. I tested a dozen scenes from various soundtracks this way as well as a battery of other tests and the results were similar. The difference was that the clone handled every scene that the AA and Marathon couldn't because it's cap reservoir was able to supply and the amp boards could handle the transient current (signal) without errant spiking at ULF. This is no doubt because the clone employs a regulated SMPS with PFC, so its cap res ('only 27,000 uf, consisting of 10 x 2700 uf @ 200V) is plenty to warrant its 2 Hz FR and the AA and Marathon were not likewise up to their 5 Hz FR. At least the Marathon popped a fuse and was otherwise not harmed whereas the AA just died.
This basically means that I could report my findings regarding my 3500 cubes room playing the most difficult program source at calibrated reference level comparing the 3 amplifiers in the same system, which I probably did (it's been a few years).
If I had instead just said that the Marathon was WAY better than the AA but the clones beat them both by a mile, or some such rhetoric, some people might take that and run with it but the more savvy posters would have taken me to task.
I found the MA-5050 to be well worth the price paid for the reasons Josh brought up, with the caveat that it requires a HPF in the signal chain if full output playback is required and, actually in most folks systems the signal chain is sufficiently rolled of <10 Hz that is shouldn't be a problem. I also considered the additional current which is probably what cooked the AA and caused the MA fuse to pop from plugging into a dedicated 30A line. This result would most probably have been different in a 20A or 15A outlet.
This doesn't address any changes MA has made to the amp, nor does it address the CV amp or any differences between it and the MA, but I have to question the whole way better thing, is all.
Pop the lids and snap a side-by-side. Set up a test with mic or meter in the same place, calibrated the same, differing source, etc. Otherwise, I'm with the OP, still searching for that sort of test result with the CV amp.