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EVERSOLO DAC-R8 R2R DAC Preamplifier Headphone Amplifier
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EverSolo DAC-R8 R2R DAC Preamplifier Headphone Amplifier 32bit 768khz DSD512
The Eversolo DAC-R8 is an R2R DAC with an integrated preamplifier and headphone amplifier. Its in-house designed Origin R2R 5+20 bit architecture supports streams up to DSD512 and PCM 768kHz 32 bit, while its balanced analog volume control preserves signal resolution.
Intended for a desktop hi-fi setup or a more complete system, it combines digital inputs, Bluetooth connectivity and DSP settings accessible from a web browser. It can thus centralize conversion, volume control and headphone listening, while integrating into an evolving system thanks to its external clock input and 12V trigger output.
Eversolo DAC-R8: R2R architecture
The Eversolo DAC-R8 combines an R2R DAC, a preamplifier and a headphone amplifier within an in-house designed architecture. Its Origin R2R 5+20 bit DAC splits PCM processing between a coarse 5-bit segmentation and a fine 20-bit adjustment, coordinated by an FPGA to precisely control signal amplitude. Conversion can thus preserve low-level variations, while native support for DSD512 and PCM up to 768kHz 32 bit covers high-resolution formats.
The resistor network operates differentially from the first stage, with separate positive and negative paths feeding the balanced analog stage. DSD processing follows a dedicated path: pulse-density modulated data is routed to the resistor array with fewer intermediate conversion steps. For PCM, the FIR digital filters run by the FPGA offer several modes as well as a bypass option, so that processing can be adapted to the signal and to listening preferences.
Eversolo DAC-R8: Signal stability
A common control handles playback, muting and format or clock changes; this coordinated management aims to maintain stable operation during transitions. Precise resistor matching and an optimized analog path help keep distortion and noise low: Eversolo specifies a THD+N below 0.000316% (−110dB), with a signal-to-noise ratio and dynamic range of 130dB.
Eversolo DAC-R8: OCXO clock
The 10 MHz OCXO clock designed by Eversolo provides a time reference with low phase noise and high frequency stability. In asynchronous USB mode, the DAC-R8 uses its own clock to time processing, independently of the connected source. An external clock input also accepts 10MHz or 25MHz references, with a 50Ω impedance, allowing a common time base to be shared with other compatible digital components.
Eversolo DAC-R8: Linear power supply
The toroidal transformer linear power supply feeds the digital and analog circuits through multi-stage regulation. Internal shielding limits interference between sections, while the analog circuits rely on OPA1612 operational amplifiers to process signals with low noise and low distortion. This layout aims to preserve the information from conversion through to the outputs.
Eversolo DAC-R8: Analog volume control
Volume control is based on a balanced stepped R2R resistor network that attenuates the signal in the analog domain. Unlike digital attenuation, this approach avoids reducing effective resolution when adjusting the level, allowing the volume to be adjusted without altering upstream digital processing.
Eversolo DAC-R8: Preamplification and headphone listening
The DAC-R8 can be used as a preamplifier in a hi-fi system and features a 6.35 mm jack headphone output with a dedicated amplification circuit. Three gain levels and automatic impedance detection make it easier to match different headphones, without requiring a separate headphone amplifier. The unit thus combines conversion, level control and headphone amplification in a single desktop component.
Eversolo DAC-R8: Extensive connectivity
The AES/EBU and coaxial S/PDIF inputs feature electrical isolation designed to limit the propagation of ground noise and interference between devices. The coaxial signal is then aligned with the internal clock, while the AES/EBU input combines balanced transmission and impedance matching to maintain link stability. An XLR and RCA analog input completes the integration options, and the 12V trigger output allows the DAC-R8 to be powered on in sync with an amplifier or other compatible device.
Bluetooth 5.4 connectivity supports the aptX, aptX HD and aptX Adaptive codecs for playback from a smartphone or tablet. A dedicated ground terminal also allows an external grounding device to be connected when the system configuration requires it, in order to adapt ground management to the other installed devices.
Eversolo DAC-R8: Processing modes and DSP settings
Three modes let you choose the digital processing applied to the signal. In NOS mode, conversion keeps the samples without oversampling; OS mode offers ×2, ×4 or ×8 oversampling, while BEST mode aims for a compromise between the two approaches. The choice depends on the desired sound and the type of signal being played.
The Web-Based DSP Tuning interface provides access to equalization, FIR filtering, dynamics and delay settings from a web browser, with no driver installation required. Adjustments can be made independently on each channel, and the firmware can be updated online. The DAC-R8 can also be controlled from the Eversolo Control app via Bluetooth, to change settings or select an input from a phone or tablet.
Eversolo DAC-R8: I2S pinout
Technical specifications
| Specifications | |
|---|---|
| Product type | DAC with volume Headphone amplifier Preamplifier |
| Inputs | 1x Coaxial 1x Optical Toslink 1x AES/EBU 1x USB-B 1x HDMI ARC 1x HDMI I2S 1x USB-A (Firmware update) 1x BNC (Clock) Bluetooth |
| Outputs | 1x Single-ended stereo RCA 1x Balanced stereo XLR 1x 6.35mm jack headphone output |
| Supported sampling rates | USB, I2S: PCM up to 32bit 768kHz, DSD up to DSD512 AES/EBU, Optical, Coaxial: PCM up to 32bit 192kHz, DSD64 DoP HDMI ARC: PCM up to 24bit 192kHz |
| DAC chips | R2R |
| Central control chip | DCP8568 |
| Operational amplifier | OPA1612 |
| Bluetooth chip | Qualcomm QCC3095 |
| Bluetooth version | 5.4 |
| Supported Bluetooth codecs | SBC, AAC, aptX, aptX HD, aptX Adaptive, aptX Lossless, LDAC, LC3 |
| Trigger | |
| Preamplifier output | |
|---|---|
| Output level | RCA: 2.5Vrms XLR: 5Vrms |
| Total harmonic distortion more noise (THD+N) | RCA: 0.000355% XLR: 0.000316% |
| Noise | RCA: < 1.6µVrms XLR: < 1.9µVrms |
| Signal-to-noise ratio (SNR) | RCA: 127dB XLR: 130dB |
| Frequency response | 20Hz-20kHz (±0.25dB) |
| Channel separation | −142 dB |
| Dynamic range | RCA: 127dB XLR: 130dB |
| Headphone output | |
|---|---|
| Output level | Low gain: 2.5Vrms Medium gain: 5.5Vrms High gain: 7Vrms |
| Total harmonic distortion more noise (THD+N) | Low gain: 0.000398% Medium gain: 0.000356% High gain: 0.000287% |
| Noise | Low gain: < 3.7µVrms Medium gain: < 3.8µVrms High gain: < 5µVrms |
| Signal-to-noise ratio (SNR) | Low gain: 124dB Medium gain: 126dB High gain: 127dB |
| Frequency response | Low gain: 20Hz-20kHz (±0.2dB) Medium gain: 20Hz-20kHz (±0.24dB) High gain: 20Hz-20kHz (±0.2dB) |
| Channel separation | Low gain: -71dB Medium gain: -75dB High gain: -90dB |
| Dynamic range | Low gain: 124dB Medium gain: 126dB High gain: 127dB |
| General | |
|---|---|
| Supply voltage | 100~240V AC, 50/60Hz |
| Consumption | 32W |
| Dimensions | 315 x 230 x 75mm |
| Weight | 4kg |
| Color | Black |
| Package | 1x Eversolo DAC-R8 1x Remote control 1x Trigger cable 1x Power cable |
| Input | SPDIF |
| Input | Bluetooth |
| Input | AES/EBU |
| Input | HDMI ARC |
| Input | USB |
| Input | Optical |
| Input | I2S via HDMI |
| Input | Clock (BNC) |
| Output | Jack 6.35mm |
| Output | XLR |
| Output | RCA |
| DAC / ADC Chip | R2R LADDER DAC |
| Max sampling rate | DSD512 |
| Max sampling rate | 768kHz |
| Color | Black |
| Class | Class D / T |
| Networking | No |
| Remote Control | Yes |
| Remote Control | Control app |
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