Power Cord Revelation

I found the biggest differences are on the source, preamp and power conditioner. Different power cords on my amp has a little effect on my system. The PC for amp is the last PC cable to get to fine turn the improvements on the other components.

Tboooe,I also wonder before why my Pass Lab X250 did not
improved much,when I replace the stock cord,that time I
am using the CPC model eleven,I just got exactly what you
described,I remember on one thread Pass Labs dont really
benefit much on replacing their stock cord,I dont know
why?Like I said maybe Audience powerchord and DCCA ref1
will do the trick..I believe Pass Lab are good amplifiers.
I switched to tubes though..

With my Pass Lans x350.5 I have a Virtual Dynamics Rev2 power cord on it and it is a big improvement over a standard cord. The improvement is in dynamics and bass texture.
I also have My Amp plugged into a dedicated 30A circuit.

I have several Audiophiles using DCCA pc's on their Pass amplifiers and very satisfied with the sonic results. Really comes down to what you want to hear. Don DCCA

I think that there are reasonable explanations for how custom power cords can positively impact the performance of even (or especially) high performance audio equipment. They have mostly to do with the electrical environment OUTSIDE the components in your system. This topic has received much attention on Audiogon and elsewhere (see this recent thread for example http://forum.audiogon.com/cgi-bin/fr.pl?fcabl&1190049515&openusid&zzKnownothing&4&&).

Also see the Guerrilla Audio site for the most logical description I have seen from any vender as to how well designed PCs work to improve performance
http://www.guerrillaaudio.com/product_8_WhisperQuiet_Power_Cable__The_Juice_cat_5.html.

Good luck.