Yes, I believe the cost difference between the 1.5's and 2.5's is worth it. I spent a long while auditioning both speakers and ended up with the 2.5's. The additional bottom end (and it has fabulous bass) combined with its much larger soundstage and extremely rich midrange put it in a different class entirely. What Whknopp0713 says about the speed of the 1.5's is true -- they are quicker and seem a bit more detailed than the 2.5's. But the overall sound is much smaller, a bit brighter, and lacking the midrange luxury of the 2.5's, which is why folks like me that like tubes enjoy the big brother quite a bit more.
Like all speakers, its a matter of taste. For a home theater setup, I think the 1.5's with a quality sub would be a great fit. For two channel audio however, there really is no comparison between the two. As always, everyone's ears and tastes are different, so your mileage may vary. I suggest that you find a dealer that carries ProAc and try them out both on SS electronics and with tubes and see what you think.
-- Ken
Like all speakers, its a matter of taste. For a home theater setup, I think the 1.5's with a quality sub would be a great fit. For two channel audio however, there really is no comparison between the two. As always, everyone's ears and tastes are different, so your mileage may vary. I suggest that you find a dealer that carries ProAc and try them out both on SS electronics and with tubes and see what you think.
-- Ken