Buonasera,
stavo valutando alcune schede audio esterne, ma ci sono alcuni dati tecnici di performance audio, che sfuggono alla mia comprensione, se qualcuno ne conosce il significato e se sono parametri buoni o scarsi, per valutare una giusto acquisto.
Giuseppe
Analogue Input Performance
Mic
Frequency Response 20Hz - 20kHz +/- 0.1 dB
THD+N < 0.002% (minimum gain, -1dBFS input with 22Hz/22kHz bandpass filter)
Equivalent Input Noise (EIN) < -120dB: measured at 55dB of gain with 150Ω termination (20Hz/22kHz bandpass filter)
Gain Range +10dB to +55dB
Max Input Level
?Noise EIN -3dBu
120db misurato a 55 db di gain
Line
Frequency Response 20Hz - 20kHz +/- 0.1dB
THD+N < 0.002% (measured with -1dBFS input and 22Hz/22kHz bandpass filter)
Noise -90 dBu (22 Hz/22KHz bandpass filter)
Signal to Noise Ratio > 100dB
Gain Range -10dB to +35dB
Max Input Level +20dBu
Instrument
Frequency Response 20Hz - 20kHz +/- 0.1dB
THD+N 0.005% (measured with -8dBu input and 22Hz/22kHz bandpass filter)
Noise -87dBu (22Hz/22kHz bandpass filter)
Gain Range +10dB to +55dB
Max Input Level -3dBu
Analogue Output Performance
Nominal Output Level 0dBFS = 10dBu, balanced
Frequency Response 20Hz - 20kHz +/- 0.2dB
THD+N < 0.001% (measured with 0dBFS input 22Hz/22kHz bandpass filter, un-weighted)
Output Impedance < 10Ω
Power Output into 150Ω 15mW
Power Output into 50Ω 30mW
Digital Performance
Clock sources Internal clock only
A-D Dynamic Range 105dB 'A-weighted' (all inputs). Converter chipset A-D dynamic range 114dB
D-A Dynamic Range 104dB 'A-weighted' (all outputs). Converter chipset D-A dynamic range 114dB
Supported sample rates 44.1 KHz, 48 KHz, 88.2 KHz, 96 KHz
Crosstalk
Input to Input Better than 90dB
Output to Output Better than 90dB
Input to Output Better than 85dB
Input Metering
Ring LED lit Green Signal present (-24 dBFS)
Ring LED lit Red Signal overload (0dBFS), peak held for approximately 1 second
…e pure questi:
Microphone Inputs
Maximum Input Level for 0 dBFS (maximum gain, no pad): -53 dBu
Maximum Input Level for 0 dBFS (minimum gain, with pad): +7 dBu
S/N Ratio (Unity Gain, Ref. = +4 dBu, 20 Hz to 22 kHz) > 95 dB
Common Mode Rejection Ratio (1 kHz, 55 dB Gain) > 45 dB
Pad Attenuation: 10 dB
Maximum level (A-weighted): 16.3dBu at 1%
Instrument Inputs
S/N Ratio 89 dB, 0 dBu, 1 kHz, unity gain, 20 kHz BW, unwtd
Input Max Headroom +15 dBu, < 0.5% THD
Input Impedance 1 MΩ
Digital Audio
Reference Level for 0 dBFS +4 dBu
Analog Outputs
Output Level +10 dBu
Output Impedance 51Ω
Latency (Minimum Buffer Size): 77 SamplesNote
