DVV--Thanks for your comments it helps to further understand the workings behind improving and looking into the tech that goes into amps.
One last question:
I remember reading that a one benchmark about how good an amp is can be measured at how much power can be deliverd when Halfing the Impedance rating.
As an example lets say an amp is stated to deliver 200watts at 8ohms and then delivers 400watts at 4ohms then deilver 800wats into 2ohms.Does the ability to double it's rated output that way tell you anything about the amps ability besides being able to drive a wider range of speakers?
TIA,ABEX 
Actually, it tells you several things.
1. It tells you the designer was using his head while working, and recognizes the fact that nasty things like impedance drops, phase shifts, etc actually do exist, operate in real life like it or not, and attempt to modify the amp's performance into real world speakers, as opposed to lab test loads (usually a bank of high power resistors);
2. It tells you the power supply of that amp has been really well done, no skimping. No output stage can deliver real world power into real world speakers if it doesn't have an enbergy pool to draw that power from;
3. It tells you the output section in particular, but also the whole amp, has been concieved with proper capability to negotiate even very difficult loads, which gives you freedom to choose among speakers according to taste, and not to have to think about drive capabilities, and
4. It tells you the amp's performance, such as distortion and frequency response, will be modified very little by even evil loads, which is a hallmark of any good design.
As a sideline, it also tells you whoever designed it, was one competent designer and worthy of respect.
On the other hand, however important that is, it's not the only factor deciding on the overall quality of the sound. Let me put it this way - such an amp stands a better chance of sounding good than another without such capabilities.
This means the amp's dynamics will not be curtailed by less than perfect loads, and that it will in fact drive almost anything somebody decided to call a speaker.
Cheers,
DVV
