Hi all.

Just some thoughts from an amplifier designer.

When ever i take a given amplifier and 'tweak' it through listening tests to improve the sound, i always find that the measured perfomance has also increased, like wise if i 'tweak' the amp on the bench with the test equipment to improved measured performance the subjective quality also improves.

This i am happy with as a small minded engineer i can cope with it !!

I do have a problem though: sometimes I totally rip up my new design and try a new circuit configuration, this configuration still follows the same pattern as above, but i find that it may sound subjectively better and measure worse than the prievious design or measure better and sound worse.

This i do not understand !!

The only assumptions i can make is that either i'm measuring the wrong things, or that the distortion characteristics of the amp interacts with the distortion characteristics of the speakers and with some configurations they add and some they subtract.

Enough of my rambling thoughts - off to work to listen to some music - god i've got a nice job !!!

Chris