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I agree, but! it can be a problem if left open circuit (nothing attached) or used with un-shielded interconnects which many whacko's do, as then it is very susceptible to RF break through.
Also regarding wattage advertised, purposely understating the 8ohm wattage, this is starting to become a disturbing smoke screen trend these days, advertised 200Wpc into 8 ohms or 400Wpc into 4 ohms make this amp look as though it can double into each having of impedance load making it look as though its real current pusher into nasty speaker loads like the Wilson Audio Alexia.
When as you tested it gives in fact 340W into 8 ohms and only 480W into 4 ohms. Which is not a very good current pusher, pretty weak in fact and may not drive the Alexia's .9ohm EPDR load in the bass very well at all.
In a way Larry Greenhill heard what the circuit/topology limitations are in the bass EG: not much current.
"However, the Constellation didn't go as low in the deep bass. This meant that dynamic contrasts involving deep bass, such as sustained pedal chords from pipe organs, were more emotionally involving with the No.334, shaking my listening room more. When I played the Toccata of Widor's Organ Symphony 5, as performed by Jonas Nordwall and recorded by John Atkinson (24/88.2 AIFF file), the No.334 delivered more thunderous deep-pedal notes that pressurized the room"
Even though the ML334 is only a 125w amp it can push more current into the bass of his Revels than the 340w Constellation can.
https://www.stereophile.com/images/archivesart/708Revfig01.jpg
Cheers George