HOLO AUDIO SPRING II Level 2 DAC R2R balanced XLR 32bit DSD1024

HOLO AUDIO SPRING II DAC Level 2 (R2R - DSD1024)
Discover the first R2R DAC with active compensation and true native support up to DSD1024 without overmodulation. Double network of balanced resistors and unbridled input interfaces for a simply unique high resolution listening experience.

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Shipping date: 21-10-2020.

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Holo Audio Spring II DAC L2

DAC R2R DSD1024 / PCM1.536M




The legendary Spring (Asterion), essential reference for R2R conversion circuits, returns in a largely optimized version with femtoclock clock, modified interfaces and a whole new structure of resistance network offering exceptional measurements.

HoloAudio is a true masterwork of digital to analog conversion. It uses two different circuits (R2R DAC) to work separately with DSD and PCM signals in order to make the most of both technologies without compromising audio quality. Its DSD exclusive circuit makes it the very first R2R DAC supporting native DSD without any conversion or modulation.

This version integrates an impressive panoply of heavily modified I / O interfaces to work in line with the hardware reality of the device and get the best audio performance. Such as a quad-circuit I2S interface as well as a USB interface controlled by femtoclock clock with exclusive firmware offering performance 2 to 4 times superior to standard XMOS U208 algorithms.

The Spring II has an oversized power circuit with digital and analog circuit isolation to deliver exceptionally clear sound with a noise level below 0.2uV over the entire 100kHz band.

SPRING II version Level 2

HOLO Spring Level 2

HOLO Spring Level 1

Remote

Yes

No


Power filtering

Mundorf Evo SilverGold Oil Capacitors

Standard Capaticors


Review by Audio Science Review


 test par le forum de mesure Audio Science Review

R2R Dual Circuit


The digital to analog conversion stage consists of a double resistance network (R2R DAC).

The first network is an R2R circuit optimized for multibit signal conversion (PCM) accompanied by an auxiliary dynamic compensation network. This redundancy makes it possible to overcome the limitations induced by the tolerance of the componentsand reach a level of precision that would otherwise require resistors with a tolerance of 0.00005%!

The network sercond is also an R2R circuit optimized for the digital to analog conversion of signals encoded on one bit (DSD).

This technology, specially developed for the Spring II, has been soberly called "Vector Step Resistor Network" by Holo Audio. Its principle consists in dimensioning the resistance network in order to allow it to convert the signal in real time. Le circuit
The DSD circuit thus avoids any form of memory buffering or multi-bit signal pre-conversion technique that may otherwise cause additional modulation and affect the timbre of very high definition audio files.

The Spring II is able to exploit all the advantages of the DSD format without any compromise on fidelity, a unique feature to date.

Each of these two resistance networks is mounted in a fully balanced structure with positive on the upper face of the PCB and negative on the lower face to increase accuracy without increasing the size of the case.

Mode Oversampling & Non-Oversampling


The firmware integrates various sampling modes to offer a flexible conversion solution that will easily adapt to your audio installation.

  • Mode NOS (no oversampling and direct conversion of the digital stream).
  • Mode OS (oversampling of PCM and DSD signals at the highest frequency before converting digital to analog).
  • Mode OS PCM (automatic PCM conversion before D/A conversion, regardless of the type of input signal).
  • Mode OS DSD (automatic DSDconversion before D/A conversion, regardless of the type of input signa).

Input Connectivity


The input panel offers all the necessary connections to deal with any integration scenario.

There is an AES / EBU entry, a coaxial S / PDIF input on RCA connector as well as a coaxial input on BNC connector. A Toslink Optical S / PDIF connector is also available. These inputs support sampling from 44.1 to 192kHz - 24bit (PCM) and DOP64 (DSD).


The I2S input on HDMI connector conforms to the LVDS HDMI standard (Audio-GD, Singxer ...). This input is compatible with the sampling frequencies from 44.1kHz to 1,536M - 32bit (PCM) / DOP64-512 / DSD64-1024 (DSD native).

The Spring II also has a USB input with galvanic isolationand native support for digital streams up to DSD1024 and PCM1.536M. This feature allows the Spring II to offer two inputs compatible with the extreme sampling frequencies., when most of the very high-end DACs only have an I2S input -less standard - for this purpose.

Output Connectivity


The DAC Spring II L2 offers a balanced analog stereo output on 3-pole XLR connector as well as a single-eded analog stereo output on RCA connector.

The output stage operates entirely in pure class A.

It is a pure DAC (no volume control or attenuation). The outputs must therefore be connected to a preamplifier, an integrated amplifier or active speakers with adjustable attenuation.

Ultra Clean Power Supply


The device has its own regulated linear power stage with 5N copper toroidal transformer. Excellent Mundorf Evo SilverGold Oil Capacitors are in charge of its filtering and effectively block unwanted noise from various interference and fluctuations in the power grid.

A thick aluminum plate separates the power stage from the digital / analog conversion stages and ensures a signal free from any parasite. Likewise, the digital and analog stages pass through isolated power supply units in order to preserve all the sound finesse of the Spring II.

The device thus displays an exceptional power ripple rejection rate beyond 110dB with a noise level of less than 0.2uV over the entire 100Khz band.

HOLO Audio Remote


the Spring II comes with its elegant and robust remote control, using the copper gildings specific to the brand.

The latter is able to comfortably control the device in its most common functions : activate and deactivate oversampling, mute / unmute audio, adjust screen display, select the active input and output.

Specifications
TypeDAC
Conversion technologyR2R
InputsUSB-B (USB3)
Coaxial SPDIF RCA
Coaxial SPDIF BNC
AES/EBU
Optical Toslink
I2S HDMI (LVDS)
OutputsStereo Single ended (RCA)
Stereo Balanced (XLR)
SNRPCM : -120dB
DSD : -126dB
Output levelSingle ended RCA : 2.5V
Balanced XLR : 5V
Input sensitivityCoaxial : 75Ω
Optical : 19dBm
Sampling rateS/PDIF : 44.1 - 192kHz / DOP64
USB : 44.1 - 384kHz / DSD1024
I2S : 44.1 - 384kHz / DSD1024
USB compatibilityWindows, Mac, Linux
Power consumption40W
Dimensions430 x 300 x 55mm
Weight8.5kg
Package contents
DAC R2R Spring 2 L2x1
USB cablex1
HoloAudio Remotex1
 
Data sheet
InputSPDIF
InputI2S via HDMI
InputUSB-B
InputUSB 3.0
InputOptical
InputBNC
OutputXLR
OutputRCA
DAC ChipR2R LADDER DAC
Max sampling rateDSD1024
ColorOther
 
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HOLO AUDIO SPRING II Level 2 DAC R2R balanced XLR 32bit DSD1024
Discover the first R2R DAC with active compensation and true native support up to DSD1024 without overmodulation. Double network of balanced...

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