Expert 500 vs Expert 400

[ogs]

I do not think the difference is related to power. It has been said that a single D250 Pro (CI) sounds on par, some even say better, than a 440 Pro (CI). The 250 has the same cabinet as D-Premier with better cooling properties than 220/440 (200/400). I guess Devialet takes advantage of the cooling properties and give parts of the electronics more optimal working conditions. I do not know this though. The electronics inside the amps are supposed to be identical (220, 250 - not 140), but we don't know for sure. Or maybe someone here at DC has better hardware knowledge than me

EDIT: D-Premier and D200 does have different electronics inside so that could also account for the difference you heard.