In article ,
Arny Krueger wrote:
"Eeyore" wrote in
message
"Dave Plowman (News)" wrote:
Pickup on cables is effectively influenced by the output
level from the mic.
Utter nonsense.
Mic acoustic sensitivity ranges over about a 30 dB range. A 30 dB larger
signal is going to be about 30 dB less affected by a given level of noise
pickup.
In practice, the range is usually less, because less sensitive mics
tend to be used where the sound is louder. IOW, people tend to use
Shure SM58 (one of the lesser-sensitive mics) for close-micing loud
vocals or instruments, and not for far more distant XY pickup of a
group.
These days there is at least a standard output level to refer to. Once
there was none and outputs varied enormously. Probably the least sensitive
mic I know is the STC lip ribbon - used by commentators in a noisy
environment. It's an ancient design but still effective in limited
applications. You'd probably set your mic gain at about 60-70 dB to get
full output from a loud commentator. Replace that mic by a Neumann U77 at
the same distance from the mouth and you'd need to reduce that gain by
about 70 dB...
--
*Half the people in the world are below average.
Dave Plowman
London SW
To e-mail, change noise into sound.