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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 |
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