16 Aug
2014
16 Aug
'14
3:37 p.m.
On Aug 15, 2014, at 5:15 PM, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
I am not sure I'd class microphones as domestic audio equipment any more.
But anyway....
Things like moving-coil microphones, moving coil speakers, pickup
cartridges, etc are essentally symmetircal and floatingwrt grounds. So
they can all befed into differntial inputs with no ground noise pronlems,
etc. Electret microphones, with bilt-in preamplifiers (Maybe jsut an FET)
can be floating, (they are oftne powered by an internal battery) but the
asymmetry of the circuit meansthat the stray capacitance from each side
of the output to ground is not the same. This probbly has no effect at
audio frequencies, though.
I was thinkign more of mains-powered devices like radio tuners, CD
players/DACs, tape recorders, etc. Not one domenstic unit that Iv'e ever
seen has differential audio inputs/outpus.
...
Perhaps some audiophool could tell me why domestic audio equipment never
has balanced inputs and outputs. Now that, by eliminating problems from
ground noise, could make a real differnece. But that's engineering, not
snake oil, I guess.
Some does. I have a set of Nakamichi microphones that have balanced outputs, I forgot the name of the connector but it?s
widely used in
professional audio. Fortunately it comes with adapters for my
XLR?
unbalanced home-grade recorder.
Siad adpater may just easrth oen side of the output form the microphone
and feed the other side inot the unbalanced input :-(
-tony