Relay volume & balanced con

[ciccio73]

Hi,
i try to do an Aleph p 1.7 but this is my first experience with relay volume and balanced connection.

1) in the Aleph project volume relay, the input impedante isn’t costant (from 300 Ohm to 8k Ohm), the preamplifier see a variable impedante at his output. I study that the input impedante must be very higth and constant .

2) in the balanced connection the gnd of the input signal is connect to the circuit in the reciever or use only for shield the wire.

I’m sorry if the question are stupid but i’m confused.

Thank you for your time

Paolo