Сейчас есть больше менее унылых вариантов.
Например из недорогих M-Audio Fast Track MKII.
24 бита реально лучше.
А у этой ESI спецификации реально унылые, фактически как у встроенного звука.
Analog Input Specifications
- 4 channel analog input / line, mic, Hi-Z input support - line input level: -10dBV unbalanced nominal level, +6dBV maximum level - input impedance - Line: 10K ohm Mic: 6.8K ohm
Hi-Z: 200K ohm or better
- +48V phantom power support for XLR microphone input
Analog Output Specifications
- 6 channel analog output and mix output - line output level: -10dBV unbalanced nominal level, +6dBV maximum level - output impedance: 100 ohms
ADC Specifications
- dynamic range: 85dB a-weighted (typical) - frequency response: 20 ~ 20 kHz (+/- 0.25dB max, @ fs=48 kHz) - resolution: 18 bits
DAC Specifications
- dynamic range: 87dB a-weighted (typical) - frequency response: 20 ~ 20 kHz ((+/- 0.25dB max, @ fs=48 kHz) - resolution: 20 bits
Headphone Amp Specifications
- output power: 125mW max @ 32 ohm - recommended load impedance: 32 ~ 300 ohm
Ни в какие ворота по современным понятиям.
Для сравнения спеки FT MKII:
Microphone Input
max input level -1.8dBu, min. gain
signal to noise ratio -102dB, A-weighted, min. gain
dynamic range 102dB, A-weighted, min. gain
THD + N 0.003% (-90 dB) @ 1kHz, -1dBFS, min. gain
frequency response 20Hz to 20kHz, -0.3 / +0.1dB, min. gain
gain range 48 dB
input impedance 6K Ohms (balanced)
crosstalk < -105dB, 1kHz, channel-to-channel
phantom power +48V, 10mA max
Guitar Input
max input level +12dBV, min. gain
signal to noise ratio -103dB, A-weighted, min. gain
dynamic range 103dB, A-weighted, min. gain
THD + N 0.005% (-86 dB) @ 1kHz, -1dBFS, min. gain
frequency response 20Hz to 20kHz, -0.2 / +0.1dB, min. gain
gain range 40 dB
input impedance 1M Ohms
crosstalk < -105dB, 1kHz, channel-to-channel
Line Outputs
max output level +2dBV (monitor off), +8dBV (monitor on)
signal to noise ratio -105dB, A-weighted, max. gain
dynamic range 105dB, A-weighted, max. gain
THD + N 0.002% (-94 dB), 1kHz, -1dBFS, max. gain
frequency response 20Hz to 20kHz, -0.2 / +0.1dB, max. gain
output impedance 100 ohms
crosstalk < -110dB, 1kHz, channel-to-channel
Headphone Outputs
max output level +2dBV at THD < 0.007% into 32 ohms
max output power 48 mW per channel into 32 ohms
signal to noise ratio -105dB, A-weighted, max. gain
dynamic range 105dB, A-weighted, max. gain
THD + N 0.007% (-83 dB), 1kHz, -1dBFS, max. gain
frequency response 20Hz to 20kHz, -0.2 / +0.1dB, max. gain
output impedance 33 ohms
crosstalk < -85dB, 1kHz, channel-to-channel, into 32 ohms
headphone impedance 32 to 600 Ohms recommended