The USB-1 option for the REVO IPA-140 amplifier consists in two independent boards, mounted in a “sandwich” configuration. One contains the digital and filtering stage, the other the analog filtering and output stages. 
This board must not be considered as a mere addition of a digital input, but as a high quality solution, able to compete with the best converters on the market.
Plus, since it’s installed inside the amplifier, it eliminates the need of an interconnection cable which, if high quality, would cost far more than the USB option itself, and maybe even more than the external DAC.
 The USB receiver is a Tenor TE8802L, which can support frequencies up to 192 KHz, both in synchronous and asynchronous mode. On Apple systems, it requires no driver installation.
The Digital-to-Analog converter used is the Wolfson WM8741, one of the most modern and appreciated DACs, which can work at up to 24 bit and 192 KHz (with internal 32 bit calculations).
 The digital board has 3 independent tension regulators, plus a local high-stability and low phase-noise oscillator.
Three different digital filters can be selected just by connecting the jumper on the board, to obtain different temporal and phase responses.
 A particular effort has been put in the analogue section: in fact, thanks to a proprietary solution, just one active stage is on the signal path, to minimize the influence on sonic performance.
 The board can be easily installed in the device, at any moment.

- USB input full bandwidth, up to 24 Bit / 192 KHz.
- Local Oscillator high stability, low Jitter and low phase noise.
- 3 Voltage regulator
- AKM4391 High End 32 Bit DAC
- Internal Digital filter x8 oversampling.
- User selectable 3 different digital filter response.
- Proprietary architecture for Analogue Filter and Output stage

Note : Specification subject to change without notice

Connections Inputs: USB, 2.0 High Speed
Sampling Frequencies: 44.1KHz, 88.2KHz, 176.4KHz, 48.0KHz, 96.0KHz, 192.0KHz
Clock performances:+/- 2ppm typ. at 25°, +/- 10ppm at 60°
Analogue Output Filter: 0,0 to 90 kHz +/- 3 dB
Configuration: Solid state
Digital Filter: User selectable 3 different digital filter response.
D/A Converter: AKM4391 High End 32 Bit DAC
Output Stage: Proprietary architecture for Analogue Filter and Output stage

Note: Specification subject to change without notice