I've always automatically opted to use the XLR inputs on my system. Since I am thinking of using a preamp with only RCA inputs and outputs, has anyone tested both RCA and XLR inputs on the SST2 amps and found any significant difference in sound or am I just thinking too much. I hope to hear the new amps this weekend and can't wait.
Thanks!
I've tried to get a definitive answer on this and there isn't one. I own and use a Bryston BP6 with my 4B-SST2. As you may know, the BP6 preamp is a single-ended device with no balanced/XLR inputs nor outputs. I have been using it to my delight but wanted to know if moving to a XLR/balanced preamp like the BP26 would provide any advantages. In summary, from the responses I've recieved is that a XLR/balanced connection between and amp and preamp (at least in the case of Bryston components, as they have been designed for this) will only allow for the same of better performance than single-ended / RCA connections.
The reason being is that the XLR/balanced connection reduces the noise floor (higher signal-to-noise ratio), reduced interference (radio, electro-magnetic etc.) and doubles the output voltage that the amplifier sees. In the case of Bryston components, the XLR/balanced, given similar quality / brand of cable, will provide the same or better performance than a single-ended / RCA connection. To what degree etc. depends on your situation i.e. how long your interconnect is (shorter = less advantage of balanced), how well shielded your interconnect is, that you're using balanced connections from source to output.
That all said, when you introduce a non-Bryston component, you're dealing with a number of other variables - since not all balanced circuits are equals in design and not all are truly balanced.
