common mode rejection vs. crosstalk
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".
to my slightly-trained eyes, the overall specs look nice. would an
experienced person agree?
Sample Rates: 44.1, 48, 96, and 192 kHz, from internal crystal or
externally supplied clock (no sample rate conversion).
Bit Depth: 16 or 24 bits
PCI Bus-Mastering DMA subsystem reduces CPU usage
Zero-latency direct hardware monitoring w/effects
Analogue line inputs-6
Type: servo-balanced, DC-coupled, low-noise input circuitry
Level (software selectable):
* Professional: +4dBu nominal, 20dBu maximum (balanced)
* Consumer: -10dBV nominal, 6dBV maximum (unbalanced)
Frequency Response: +/- .05dB, 20Hz – 20 kHz
THD+N (1 kHz at -1dBFS): -110dB (.0003%)
SNR (A-weighted): 120dB
Dynamic Range (1 kHz, A-weighted): 120dB
Stereo Crosstalk (1kHz at -1dBFS): -115dB
Common-Mode Rejection (60Hz): 40dB
Analogue line outputs-8
Type: balanced, low-noise, 3-pole low-pass differential filter
Level (software selectable):
* Professional: +4dBu nominal, 20dBu maximum (balanced)
* Consumer: -10dBV nominal, 6dBV maximum (unbalanced)
Frequency Response: 0.0/-.35dB, 20Hz – 20 kHz
THD+N (1 kHz at -1dBFS): -105dB (.0006%)
SNR (A-weighted): 120dB
Dynamic Range (1 kHz, A-weighted): 120dB
Stereo Crosstalk (1 kHz at -1dBFS) -115dB
Mic pre and line inputs-2
Type: TFPro™ combination microphone preamp and line input
Frequency Response: +0.8/-0.1dB, 20Hz – 20 kHz
Stereo Crosstalk (1 kHz min gain, -1dBFS): -120dB
Line Input:
* Gain Range: -12 to +28dB
* Max Level: +17dBV (19.2dBu)
* THD+N (1 kHz at -1dBFS, min gain): -94dB (.002%)
* Dynamic Range (A-weighted, 1kHz min gain): 100dB
* SNR (A-weighted, min gain): 100dB
Microphone Preamplifier
* Gain Range: +10 to +50dB
* Max Level: -12dBV (-9.8dBu)
* THD+N (1 kHz at -1dBFS, min gain): -95dB (.0018%)
* SNR (A-weighted, min gain): 100dB
* Input Impedance: 330 ohms
* Common-mode Rejection Ratio (60Hz): 80dB
Phone input stereo
Type: RIAA equalized phono input
Frequency Response: +/-0.5dB, 50Hz – 20 kHz
THD+N (1 kHz, 10mV RMS unbalanced input): -76dB (.015%)
SNR (10mV RMS unbalanced input, A-weighted): 90dB
Stereo Crosstalk (1kHz at -1dBFS) : -80dB
Maximum level:
* Professional: 80mV RMS
* Consumer: 20mV RMS
Input capacitance: 220 pF
Input impedance: 47K ohm
Digital I/O
S/PDIF:
* 2 in/2 out coaxial (transformer coupled)
* 2 in/3 out optical (software switched with ADAT)
* AES/EBU or S/PDIF format, switchable under software control
ADAT:
* 8 channels, 24-bit @ 44.1/48kHz
* 4 channels, 24-bit @ 96kHz (S-MUX compatible
* 2 channels, 24-bit @ 192kHz
Firewi
* 400 Mbps 1394a port (6-pin)
* Compatible with DV cameras, storage peripherals, etc
Midi:
2 in, 2 out
|