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Even though the PCM1704 PDF declare the PCM1704 support up to 96KHz / 24bit, highest word clock input is 768KHz.
In fact the PCM1704UK can support 192KHz / 24bit at 8X oversampling (USB or I2S model), the word clock input is 1.536MHz , as high as ESS9018.

Reference-10.32]USB applied USB-32^
Discrete  DAC + Headphone amplifier / Preamplifier

Built in DSP-1 data processor
32bit / 384K Asynchronous Transfer  USB-32 Chip
Built in 4 Pieces Hi-grade PCM1704UK Chips

OCC
wires and TCXO built in

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Summarize Use Manual Specs Technology Detail Custom Option Shipping Cost

Improvement may result in changes in specifications and
design without notice.
S/N Ratio
>120DB
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Gain
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+13DB  (XLR)

Volume characteristic
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100 steps Super Exponential Volume Characteristic

Channels cross
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> 130DB

Channels imbalance
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< 0.05DB
Frequency Breadth
20Hz - 20KHz  (< - 0.1DB)
1Hz - 140KHz    ( - 3DB )
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 Output Level
 Headphone output : 19V RMS  (balance , max)

Preamp Variable output : 10V RMS (balance,  max)

DAC Variable output : 5 V RMS (balance,  max)

ACSSG 1.2MA+1.2MA
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Headphone amp output power ability
(Only for >15 ohm headphone.)
Balanced mode

6000MW /  50 ohm

 3500MW  /  100 ohm

1200MW / 300 ohm

600 MW / 600 ohm

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Output impedance
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1 ohm /  Headphone output

1 ohm / DAC output
Input Sensitivity
0.5 Vp-p(75 Ohms, Coaxial)
19 dBm (Optical)
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Support Sampling USB model : 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz

SPDIF model: 44.1kHz, 48kHz, 88.2kHz, 96kHz
Power Requirement
1 Version  100-120V  AC 50/60 Hz

2 Version  220-240V  AC 50/60 Hz
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Power Consumption
35W
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Package Weight
Approximately 15KG
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Dimensions
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W430 X L430 X H93(MM, Fully aluminium ) 
Accessories
AC power cord            X1
USB cable X1
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