I have a couple pairs of the previous generation Entra 1 and Entra .5. I find the woofers to be extremely accurate and musical when paired with a high end amp. But either the crossover, tweeter or both have limitations, giving a pretty harsh top end. I would hope that this was improved for the new Beta line. I have read an article in Sensible Sounds from a year or two ago which compared the Infinity model to its closest brother the Revel in great detail. I think I remember the conclusion being that they were remarkably similar, only the outer appearance and price were significant differences. I don't remember many details, sorry. Sensible Sound had a <$1000 recommended system which included those Infinitys. They used to be sold at my local Circuit City, but a recent visit they were gone. I have seen them only at online sellers. Crutchfield has them from time to time at a good discount.
Nice thread, good to read a little about the Betas. I would love to hear a pair. The Entras were good enough to boot me firmly into this hobby, and I still enjoy them.
Rich