I agree with Teajay. Out of the stereo amps in the X series the X250 was at the top and the X350 was at the bottom. I have owned the X600 and currently own the X350.5. I prefer the X350.5. The older x series I would describe as on the cool side. The new .5 series are sweet sounding. Some have stated warm but to my ears I do not hear that.
If you do not need the extra power then the X250.5 will be a significant upgrade. If you want more power then the X350.5 is the way to go if you are leaning toward the Pass amps.
Perter Perkins at Pass has the X350.5 in his own system. He stated that out of the new .5 series the X350.5 was the better out of the stereo amps. This is what he told me so take this with a grain of salt.
If you do not need the extra power then the X250.5 will be a significant upgrade. If you want more power then the X350.5 is the way to go if you are leaning toward the Pass amps.
Perter Perkins at Pass has the X350.5 in his own system. He stated that out of the new .5 series the X350.5 was the better out of the stereo amps. This is what he told me so take this with a grain of salt.