As an owner of a Bryston 4B-ST I can say that I have heard that some owners or those that have auditioned this amp have drawn attention to its "aggrssiveness" or "forwardness". I however don't feel that way. If you have the inclination to believe these perceptions I can say that the 14B-ST and 6B-ST have new output designs/devices that apparently address these issues. Can't say personally as I have not heard either. I will say that after hearing the Sim W-5 I noted that it has a "darker" presentation than my 4B-ST but in my books it wasn't twice the amp for twice the price (retail vs retail). You could contact Bryston directly to have them explain what has been changed in the new amps before you make a decision. As always, if you can, try before you buy...
