More on XLR vs RCA considerations?


Have read much about the differences between balanced vs unbalanced circuitry and the interconnects that go with it. The consensus seems to be "mostly" in favor of balanced when it is available. There are at least a few who seem to prefer unbalanced. Perhaps if the circuitry (caps etc.) becomes equal between the two, there is not much advantage to XLR? Not sure, myself. I like to have the option even though I've never used it, just makes me feel good, knowing it's there if I ever decide to use it. Long wire runs seems to be the main reason. Are there others? I heard, lowers noise floor with higher gain. OK.

I've never seen a Conrad Johnson amp or preamp with XLR connections. Maybe they exist, don't know but I've never seen it. CJ is certainly respected in the high end audio world. I'm just curious as to why they would never build with balanced circuitry. Any thoughts on why not? I'm just curious.

Bill

billpete

... XLR connections don't necessarily indicate that the device offers "balanced" topology that can offer some ascribed benefits ...

That's true.

True balanced topology imposes twice the circuitry into the signal path.

That is completely mistaken. Many truly balanced components use differential amplifiers, for example.

I've never heard of a single ended triode preamp, but maybe that's just something else I've never known about until now? 

@immatthewj Most tube preamps are single-ended and triode. Its the rare one that isn't!

Since my preamp and amp are single ended triode design, I can never use a balanced cable between them.

@drbarney1 You could if you wanted. All that's needed is a set of line transformers at either end of the interconnect.

True balanced topology imposes twice the circuitry into the signal path.

@perazzi28 This is a common myth. Differential amplifiers are not 'twice the circuitry' at all. Another common myth is balanced lines are only good for longer lengths; the reality is there is a benefit even if the cable is only 6" long.

Thanks @atmasphere , I am pretty stupid when it comes to understanding circuit toplology.  I was always associating SET with amps, and I was also unaware that SET amps did not normally have balanced circuits that would connect right up to the balanced outputs of a balanced (single ended) amp.  Your replies are always educational.