Can't say it any better than the two above. I agree with their responses. I have it in a P300 and a P600. The most immediate thing I noticed was a blacker background allowing you to hear more detail, depth, width, and focus in the soundstage. This is a no brainer improvement to anyone who has a Power Plant.
PS Audio Multiwave-good or bad?
I know a simular thread was written some time ago when the multiwave option was very new, but now hopefully there are many more users. I own the P-300 & am very satisfied with it. I consider it to have made a huge sonic improvement to my system. I'm curious to know what kind of improvement I could expect from the multiwave option. Is it worth the $250.00. Please be specific on the sonic improvements. Thanks in advance...Sagger