upgrade is back

[thumb5]

Understood, but my comments do not engage anyone only the amplifiers under question.  The statements made are facts about the series not theories about the people using them.

There can be absolutely nothing to say about "sound quality" unless people are involved.  Otherwise, you're talking about objective measurements, be they of voltage, current, air pressure fluctuations, etc.

You are losing focus, Ian. 

Let me consisely reiterate ...

Each model of the Expert series produces the same sound quality.
Each model of the Expert Pro series produces the same sound quality.
The Expert Pro series may sound better than the Expert series but it is subtle at best.

The sound quality of EACH SERIES was not VOICED, it was cooked up in a lab using OBJECTIVE measurements only.

You can reiterate as much as you like, but you're still stating a subjective, personal opinion (about "sound quality" as opposed to objective data) that has no more validity than anyone else's opinion.

If you replaced the phrase "sound quality" in your statements above with "measurements" then we would be in agreement.