On 2 Jul 2004 13:02:02 -0400, in rec.audio.pro you wrote:

xy wrote:
what's the difference?

i'm looking at specs for the new Emu 1820m.

below are the specs. the common mode rejection always seems to be
many db less than the crosstalk db. i don't think i understand
"common mode rejection".

CMRR is a measure of how well balanced a balanced connection is.
It is a measure of how good the rejection of common mode noise is.

to my slightly-trained eyes, the overall specs look nice. would an
experienced person agree?

Anybody can get these sorts of numbers today. How does it sound?
--scott
yep, and I notice that they only seemed to spec CMRR at line
frequency, Really they should give some idea of what its like at 20K.
Normaly its easy to get high CMRR at line freq, but it tends to rise
at about 6dB/octave

Common-Mode Rejection (60Hz): 40dB
Generally means that they have cheated the cmrr specification. ie
anyone can get 40dB, but in production it could actually be say 60dB.

But they give such a loose spec, that you never can complain. One
device could be 41dB, and another 75dB, and still be in spec!



martin

Serious error.
All shortcuts have disappeared.
Screen. Mind. Both are blank.