PassX-250 vs PassX-350

Bhouser, Muralman1, I may have lost some of the details in paraphrasing what I was told so I thought I'd post the response verbatim. Sorry for any mix-up.
"In circuit design the X150 and X250 are very
similar. They both use some localized feedback around the output stage which bumps up their damping factor dramatically compared to the larger amps (X350, X600 and X1000). This higher damping factor contributes to exceptional bottom end, although the zero negative feedback characteristic of the larger amps adds to their lushness and overall neutrality. There are tradeoffs, always. However, all the X series amps are extremely dynamic, with very listenable top ends that are not forward or bright, and are very quick and responsive to musical transients."

Sonic signature similar but you gain X% in dynamics, bass slam, details. The BAT preamps drive any amp without a hitch. I used to own the VK-30SE with my X-250.

Happy Listening.

Great info Nutella- Thanks for the clear definition.

..."all the X series amps are extremely dynamic, with very listenable top ends that are not forward or bright, and are very quick and responsive to musical transients."

I could NOT agree with this statement more, especially when I mated my X-250 with the Talons yesterday - the speed, dynamics and transients really stand out now.

I went to their site and checked out the feedback issue. Nutella is right. Funny, I never saw that before, and I owned an X150. The X150 is a great amp with lots of spunk and clarity. There was nothing offensive about it's top end. It smoked a Krell KSA. I got nothing but rave reviews with it mated to an 86db 4 ohm speaker.

Muralman1- I am amazed at my x-150 too. The only upgrade I would make currently is another Pass(250-350) I wish i could afford the 600's. Thanks again for all the input.