Remember there is also the 4BSST.
4 responses Add your response
The 4B-ST carries the suffix "ST" to recognize the complete re-design of the circuitry done by Stuart Taylor. He completely revised the circuitry in the 4B, using much shorter internal connections, improved parts, significantly larger power supplies, etc. If you are interested in more background about the design of the 4B-ST, visit the Bryston web site and look through their archived newsletters and product reviews.
In short, the 4B-ST offers substantially better audio performance than its predecessor, and is well worth the additional cost.