Indyload178

Click the red folder icon to download the zipped file; Unzip the downloaded file (Windows instructions here) (On a Mac, just double click the zip file) Remove the individual files from the unzipped folder; Copy the individual files to a clean SD card. From the inventor of Hybrid integrated amplifier technology (tube+mosfet) new Z X T - 7 0 download) native DOT-BIT direct PURE DSD-DAC without chip-dac, DSD 512 drive by DSL-1 modulator. Visit our page report at Hi-end 2014 Munich.

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STAR Pure DSD DAC

INTRODUCTION

The high resolution PCM at 96-192KHz 24bit offer the possibility to have a good quality digital signal exceeding the big limits of the CD.
TheDSD is very different from PCM, using a sampling frequency 64 times higher than that of a standard Compact Disc, offers a frequency response of up to 100 kHz and a dynamic range of up to 120 dB across the entire audible range.
The DSD on paper should be better than hi-resolution pcm like the 192KHz 24bit because the two conversions (from and to the analog) are more simple (see this article from Korg website) but the AES Convention Paper 6086 and AES Convention Paper 5395, seems to contradict this.
The DSD signal can be directly used to reconstruct the original analog signal with a simple RC filter but with this method we get many digital noise also using a good digital and analog filters so forget this method.
I have lost many time and money to test these solution, using different USB to DSD interfaces, I2S isolators and D-type flip-flop.
The little Lampizator and RT audiodesign companies has succeeded to reduce the noise and produce a DSD DAC with this method but with some limits.
This project here exposed has another approach, it is based on the DSC1 that is an Open Hardware, 'discrete' delta-sigma D/A-converter developped by Signalyst, the DSC1 is able to convert the DSD signal to analog without noise and without a DAC chip.
The DSC converters does not work with a PCM signal so it is necesary convert the PCM to DSD on the fly during playing so it is necessary to use computers with adequate performance.
In this project we have used the CT7302PL single chip dual channel audio digital to digital bridge with a sample rate converter to convert PCM signals to DSD.

HARDWARE

The core of this design is the CT7302PL with the following specifications:

• SPDIF support up to 768 KHz/32bits mode
• I2S support up to 768 KHz/32bits mode
• DSD support 1x/2x/4x/8xmode
• DoP support 1x/2x/4x mode,throughI2S
• DoP support 1x/2x/4xmode, through SPDIF
• PCM SRC / ASRC fully support 32 KHz~ 768 KHz.
• PCM / DSD / DoP to PCM / DSD / DoP converter with SRC / ASRC
• Crystal reference clock / MCLK / DoP / Mute status output
• Auto De-emphasis32KHz/44.1KHz/48KHz.
• Auto detecting PCM / DoPformat.
• Auto detecting I2S / DSD interface.
• Volume control with fading in/out.(+18dB ~ -110dB step 1/32 dB)
• SRC / ASRC 32 bits dynamicrange(192dB), THD+N (-174dB).

After the CT7302PL chip there is the DSC in the differential version designed by Pavel Pogodin with the output transformers to filter and to convert the output in un-balanced and balanced signal.
The 74AHCT595 are high-speed Si-gate CMOS devices used for the serial-to-parallel data conversion.
This module use a mute circuit to eliminate any click in the transition from one track to another using the TS5A3167 (SPDT) single-pole double-throw analogswitch .

This module need a AC power supply in the range 6.5V - 7V and it can power the Amanero USB module with a dedicated 3.3V.
On Amanero module to exclude the USB power supply and use an external 3.3V is necessary cut a wire or remove on-board regulator.
The USB interface used is the Amanero with the normal firmware to support Native DSD.

The Controller module included in the kit use the 16F877 chip, a 20MHz Enhanced 8K Flash Microcontrollers.
It drive a 4 x20 characters LCD and it is connected with the I2C bus to the CT7302PL.
A separeted power transformer is used to manage the standby function.

OUTPUT TRANSFORMERS

The output transformers are necessary to mix the differential signals coming from the 74AHCT595 in phase and out phase.
These are also used to give un-balanced and balanced output signal, the module integrate a relay to switch the ground connection.
The models has been selected by Pavel Pogodin after many test and also I have compared these with other models with much higher cost always preferring these.
These have a turn ratio of 2:1+1, made with a permalloy core with a thickness of 0.16mm and an inductance about 340H.
The declared frequency response is 10Hz - 195 KHz at -0.2dB for the yellow and 20Hz - 80 KHz at -0.2dB for the black type
Yellow type has more 'air' and black are probably more balanced but it all depends very much on the record or even his mood.

REMOTE

In same case it is necessary increase the output level so use in the setting menu the V+ and -V buttons to set +6dB. +12dB or +18dB, I suggest a max of +6dB because otherwise the distortion can increase.
There is also a function to set an amplification of +6dB for DSD tracks because some player give a lower level for these.
All the settings can be saved in the EEPROM so these will be set at the next power on (press mute button on Setting menu).

AMANERO FIRMWARE

To get the max stability is necessary set theAmanero module with the last firmware 2006be10 with DSD Native support.

3) When you replug the erased device, Windows can ask about a driver.

4) Be sure to be connected to internet.
5) Run ConfigOEM117.exe and select the CPLD firmwareCPLD_for_1081_DSD_SWAPPED and CPU firmware 2006be11 after press Flash CPU.
6) Replug the USB cable and if it's all ok the audio driver needs to detect the device.

On Windows system install the driver ASIO 1062 and verify it in the device manager.

Set on ASIO panel the latency at 15msec stanting the Amanero ASIO program.

To reduce problem during playing in the control panel open Sound and select as default audio device another interface.
You will select the ASIO Amanero inside the player.

SOFTWARE

• HQPlayer by Signalyst available for Windows, Mac OS and Linux, there is a Server and a Desktop version at a cost of 145,18 euro
• Daphile Audiophile Music Server for x86 hardware, it is free but it need a dedicated hardware
• JRiver Media Centeravailable for Windows and Mac OS at a cost of $49.98
• Foobar2000 freeware

MEASUREMENTS

Output at 0dB near to 1.5Vrms.

REVIEWS

STAR DSC took first place in the contest organized by the forum Vnav.

Here is the result of a test in October 2019 with a friend of mine with a lot of experience in recording and playing audio.

Yesterday evening the first serious listening test about the new dsc module with CT7302 vs NAA (Network Audio Adapter) DSC module.
The quality of the last DSC with CT7302 is very high, the same details and the same sound stage of theNAA DSC module.
The NAA DSC module with the HQplayer filters is a little bit more softer but it is not easy define if it is more or less near to the real sound.
Using the CT7302 with jRiver the sound is very natural and analog.

PHOTOS

The ADI-2 DAC is the home and hi-fi optimized version of the ADI-2 Pro, a studio AD/DA converter of the highest quality. With many fresh ideas, innovative features and numerous useful functions, the ADI-2 DAC quickly became the reference. Thanks to its combination of high-end DA conversion with two exceptional headphone IEM outputs and a remote control, it has received countless enthusiastic reviews for its sound, flexibility, and technical capabilities.

The current version of the ADI-2 DAC comes with an extended remote control, a further improved DA conversion and an adapted analog output stage for even better noise and distortion values. To address the home and HiFi users, RME exchanged some of the Pro's studio features with typical home and HiFi ones. With an adapted feature set and much simplified operation RME proudly presents the ADI-2 DAC. Built on the technology, concept and features of the ADI-2 Pro, the DAC concentrates on DA conversion in top high-end quality, along with two exceptional headphone and IEM outputs.

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The DAC

Packed into the compact half 19” format factor, this little gem is filled with the finest high-end electronics, offering a reference class conversion from SPDIF coaxial, SPDIF optical (ADAT compatible) and USB to RCA, XLR, TRS and mini-TRS.

As the most versatile DAC available, the ADI-2 DAC offers balanced/unbalanced analog I/Os, an Extreme Power headphone output, a super low noise IEM output, SteadyClock FS, 4-stage hardware output level control, DSP-based signal processing, external power supply operation, Class Compliant USB compatibility, sample rates up to 768 kHz as well as DSD and Direct DSD playback. The SPDIF input signal can even be recorded via USB - as one would expect from RME the DAC is a true 2 channel Full Duplex audio interface.

Improving DA

The updated ADI-2 DAC uses AKM's AK4493 in a special circuit variant developed by RME engineers that allows the chip to perform at its best. With noise levels of 123 dBA, distortion less than -120 dB, or THD+N of -116 dB, the device delivers outstanding measured values. Even the IEM output, with -118 dBu already the world's lowest noise headphone output, improves to a sensational -121 dBu. In addition, there is 4 dB of digital headroom, so that even high intersample peaks do not produce any audible distortion. Finally, the device now also offers a clear reserve in volume setting. +2.5 dB result in a still undistorted analog output signal.

All these improvements are completely transparent in the previous menu navigation. There are no changes in operation, features and behavior compared to the predecessor, which is why neither appearance nor name have changed. The only difference: with 'Low Dispersion' another digital filter is available for selection. Explanations for this filter can be found in the detailed manual of the ADI-2 DAC.

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Super Low Noise for IEM lovers

The headphone revolution not only brought headphones but also IEMs (in ear monitors) back into the attention of audiophiles and music lovers. Modern IEMs have a reference sound that easily competes with bulky over-ear headphones, making them not only a mobile alternative, but also an interesting solution in home.

Modern IEMs are extremely sensitive and operate on very low voltages. As a side effect they uncover the noise floor of the player, DAC or headphone amp. When RME developed its Extreme Power headphone stage the basic noise floor was taken care to be as low as possible. Which was then confirmed in many reviews (most black background…). Even when used with IEMs.

Still RME wanted to make sure that even the most sensitive IEM combined with the most sensitive listener receive the full dynamic range on playback. Also capable outputs like the Extreme Power ones are not fully safe against operating errors and might blow up ears or IEMs.

RME's solution: adding the most advanced IEM output imaginable as second phones connection to the front of the ADI-2 DAC. Its ground noise floor is an astounding 10 dB lower than the one of the Extreme Power output (black hole background…), output impedance is near zero Ohms, THD reaches new record lows, click-free on/off is included as well as volume ramp-up, and the sound quality with any IEM is just amazing. We're sure you will love it!

Lights Out!

A studio converter with all lights off? Defective. But on a DAC it was one of the most often requested features from our ADI-2 Pro HiFi customers. Here we go: display, function keys, volume knob, even the standby button - they all go off after 10 seconds of no user operation when AutoDark is activated in the unit's menu. Touching any button or control will turn on all lights for 10 seconds. Using the remote AutoDark can also be switched off / on, and using any button on the remote turns lights on for 3 seconds. Once again: we're sure you will love it!