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[RebelMan]

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.

You have now lost focus, Ian.  LOL

It's not a personal opinion.  Lets use your earlier analogy with cars.  Let's say two cars roll off the assembly line.  Lets also say that both cars are identical in every way except in horse power.  Now, lets say that they are both driving at 60 miles per hour.  Is the ride quality any different?  Of course not. 

Now lets say both cars are driving at 150 miles per hour.  Is the ride quality any different now?  Well if the top speed of one car is 149 MPH and the other 200 MPH then there is going to be a difference.  But how often are you driving 150 MPH?  It's not my opinion that the cars were engineer that way, they just were.  Likewise, it's not my opinion that the Devialet's were engineered their way either, they just were.