Expert Pro sound quality

[boba2013]

I wonder why if you upgrade any of the Expert systems, you get between 10 to 40 watts increase and for the 800, boost of 200 watts but the 250 does not get any watt boosts???

Anyone know how they managed to squeeze an extra 20W out of the 200 - in the cheaper case with limited heat-sinking - but nothing extra for the 250 with its circa £8,000 case and new solid copper base?

The D250 and the D250Pro are both limited by the maximum voltage the Amp can deliver (slightly below 40 Volt per channel - if bridged it can deliver nearly 80 Volt)
=> 40 V are leading to about 266 W in 6 Ohm
=> 80 V are leading to about 1066 W in 6 Ohm
These values are the same for the D200 and the D220PRO but they are artificially limited to about 35 V for the D200 and about 36.5 V for the D220 to take into account their limited heat sinks.

The heat sinks of a D250 is limiting by about 800 W; the D250Pro is now optimized to handle up to 1000 W

There it is 

Thanks Pim, (and Herman)!

I wonder if that is the only difference besides the beautiful 250 case? If upgrading, those that have, did you consider upgrading from the D250 to say, the 440Pro or 1000Pro and were there any financial incentives one should consider?

Thanks again.

Bob