Pass 150.5 vs. Pass 250.5 ?

I tried both 150.5 and 250.5 with diva utopia. Both drive it to adequate level. 250.5 has quite a bit more detail. The treble is slightly hotter with the 250.5 and the base was a little disintegrated with the midrange ( probably due to speaker side firing woofer). X150.5 is less detailed and less dynamic (comparatively) but overall a more coherent and musical presentation. Room is about 25 x 16 ft. X350.5 is better than both which is what I use now.

Glai,

Thanks a lot for this comment. That was the kind of information that I was looking for.

Which pre-amp have you been using during these tests ?

When I was comparing 150.5 and 250.5, I was using the Hovland HP 100 preamp and placette passive ( I use a Bat now), I also had a pass X1 which I used with 150.5 but not the 250.5. I love the pass amps but I prefer other brands for preamps ( Pass preamp is not as fluid as I like). Many people like pass preamps though.

Before X250.5 was available, the 150.5 was billed as a 150 with a nicer faceplate with no mechanical difference. since the 250.5 and 350.5 have been introduced, x150.5 is integrated into the 0.5 line which implied the new 0.5 technology. THis is a little confusing to me but I really only cared about the sound. I am sure pass lab could help clarfy this. (Great service and support).

If I were to do it again and I had Altos (front firing) or 1027Be, I would get the x250.5 assuming the bass alignment problem is due to side firing woofers/room intereaction. I know u'd be happy with both but the issue is to pick the better one or at least the one with more potential.