I think it is a different interpretation of "the He500 at its best" that is driving this debate
Bass response from the amplifier end is largely driven by capacitors, speaker amps have large capacitor banks designed to drive large drivers to high spl.
I doubt these budget speaker amps have the finesse in there design to control all that power at the very low levels required by the He500.
So what you get is a boosted bass response much like a loudness switch or FM radio.
To many this sounds great and I can see why many would see this as the He500 at its best.
On the other side are those who consider the He500 at its best to be as near as possible to a flat response.
This is much more difficult to achieve and requires careful design and high build quality.
Both sides are correct in searching for there preferred signature and one side trying to convince the other that there way is the right way is pointless.