DI-20HE:

(Digital interface for regenerative power supplies)

Built-in regenerative power supply (using pure class A regulated power supply and pure class A fully balanced waveform driver amplifier),

Built-in Amanero interface using isolator separation, PCM384K / DSD512,

FPGA coaxial receiver interface supports up to PCM384K and DOP,

Current transfer and conventional coaxial output support up to 384K,

R-cow and 13 groups of high speed linear regulated power supplies.

Please note.

The DI-20HE has a built-in super speed isolator, the USB should be connected directly to the computer USB port, please do not connect the USB isolator again, as this may cause possible improper operation.

As there are many different IIS definitions, we only guarantee compatibility with our DACs, not with other brands.

Please note:

This product has a built-in Amanero interface and is compatible with WINs, Apple OS and IOS and PC-based Linux/Android (including Raspberry, newer Android phones and TVs). However, it is not guaranteed to work well with individual digital turntables with USB output.

Accusilicon clocks for motherboards:

Please note that:

1, This unit is expensive due to the fact that no expense has been spared in its production, so it is recommended that users with R-8/R-27 or higher grade DACs only consider purchasing it. It is recommended that users of R-8/R-27 or higher grade DACs should consider purchasing this unit. Low grade DACs connected to this unit will not be able to experience the desired effect.

2, This machine does not come with a power cord, please buy your own suitable audio power cord.

Introduction to fully analogue regenerative power technology:

Regenerative power supply is like having a private generator built into the machine.

It filters out the maximum amount of interference from the power line and provides a super pure power supply to the audio amplifier, restoring a very low-dyed, analogue signal to the audio system and the user.

The regenerative power supply is designed so that 120V / 220V AC power is converted to DC power via a regenerative power input transformer, and then to a Class A parallel regulated power supply for the regenerative waveform generator and driver.

A balanced regenerative standard waveform generator generates an ultra-low distortion 50Hz waveform, which is balanced by a gain amplifier and a powerful driver stage to drive the three regenerative output transformers to produce a pure, stable voltage and frequency supply.

The regenerative waveform generators and drivers are powered by the Class A regulators so that their operation is not affected by changes in mains power or interference.

The Class A shunt regulator has a very high input impedance to prevent interference from entering the audio circuitry through the mains supply, and also to avoid crosstalk between the left and right sound signals through the supply to improve separation. The low output impedance provides excellent linearity and speed, making it an excellent power supply regulator design.

Audio-gd's arguments for regenerative power supply design：

1, The pure analogue regenerative standard waveform generator has much lower distortion than the digital synthesis generator, as demonstrated by internal design analysis and practical testing of the AP SYS-2722.

2, The digital driver stage can have higher power conversion efficiency, but the fully analogue driver stage has more analogue flavour.

3, 400Hz regenerative waveform frequency has higher power conversion efficiency, 50Hz regenerative waveform frequency is farther away from the human hearing sensitivity zone than 400Hz, and the sound quality is more mellow and natural.

Suggestions for use：

1, the machine has been aged for 100 hours before shipment, the user is advised to age it for an additional 300 hours. The clock is aged for 1000 hours.

2, The machine can be powered on for a long time without having to be switched off. (In thunderstorms it is recommended to switch off and switch off the connection cable to the computer and TV).

3, Please make sure to disconnect the unit from the DAC before plugging in the cable.

4, Do not use overly thick USB and HDMI cables, and do not shake the cables when plugging in all connections to avoid damaging the sockets on the machine.

5, The regenerative power supply takes about 5 seconds to start up. Press the power switch when switching on the machine and wait for about 5 seconds before the display shows. Each time the machine is switched on it must be at least 30 seconds after the last time it was switched off.

6, The built-in power switch allows you to switch the working voltage of the unit if necessary (high voltage inside, do not open the case for non-professionals).

Front panel function description:

First left display:

Input channel indication. Display "1" to select USB input, display "2" to select coaxial input.

Second display from the left:

Use of internal/external clock indication. The display shows "I" (Inside) to use the internal clock and "E" (External) to use the external clock.

The other three displays:

Displays the sample rate of the current output signal. If playing a PCM signal 88.2K is displayed as "88.2". If playing DSD512, "512" is displayed.

Setting button:

Press to enter the function setting menu and the display will flash.

Ext Clk button:

Press to select whether to use the internal or external clock. The external clock indicator light will only be lit when an external clock is connected and the external clock power and clock output are switched on. The selection can only be made when the external clock indicator is illuminated.

Please note:

If the external clock loses power or if the connection cable has a bad contact, even if the external clock is selected, it will automatically switch back to the internal clock and the "E" in the display will change to "I" to avoid noise.

Selector button.

Selects the input channel.

Rear panel functions described：

AES/EBU OUT :.

AES/EBU output (5VPP @ 110 Ohm).

S/PDIF OUT STD：

Conventional coaxial output with built-in silver wire isolation transformer (0.5VPP @ 75 Ohm).

S/PDIF OUT ACSS：

Current transmission CAST coaxial output. (0.5VPP @ 75 Ohm).

Using second generation current transmission technology, the current signal is transmitted coaxially to reduce the effect of the wire on the signal. the coaxial signal from the DI output is a current signal which is converted to a voltage coaxial signal of 0.5VPP by means of a 75 Ohm resistor at the DAC input, so that the DAC being connected can be used without special design and benefits from the current transmission technology. (If the DAC coaxial input uses a transformer input, or if the impedance is not 75 ohms, or if the input level does not comply with 0.5VPP @ 75Ohm, connecting this interface may not work properly.)

IIS OUT：

HDMI transmission IIS signal output (3.3V LVDS @ 110 Ohm). Only suitable for DACs with the same pin definition, please see below for different pin definitions, not compatible with conventional HDMI for audio/video transmission and not connectable.

CLK OUT：

Outputs 256fs master clock or LRCK/WCLK clock (3.3V LVDS @ 50 Ohm). User settable.

INPUT S/PDIF：

RCA 75 Ohm coaxial input (0.5VPP @ 75 Ohm).

INPUT 10MHz：

Input for connecting an external 10MHz clock (0.3VPP - 3VPP @ 50 Ohm).

INPUT USB：

USB input (USB2.0/USB3.0).

UPDATE PORT 10-pin socket：

Connects to the Altera Blaster downloader to upgrade the internal FPGA firmware via PC with a view to upgrading functionality or performance.

UPDATE PORT toggle switch：

Upgrade the internal Amanero firmware.

Setting function description：

Setting button：

Press to enter the setting menu, the first bit of the display will flash to indicate that the function represented by this bit can be changed by using the "Selector" button. Pressing the "Setting" button again while the display is flashing will shift the flashing bit one place to the right.

Ext Clk button：

Pressing the "Ext Clk" button while the menu function is being set moves the blinking bit one place to the left.

Selector button：

Press to change the blinker setting.

The first display bit：

"P" (Parallel) means that the internal signal processing is processed using 32-bit (PCM) or 64-bit (DSD) parallel mode. "S" (Series) means that the internal signal processing is handled in 1-bit serial mode. (USB input HDMI-IIS output supports parallel/serial mode, coaxial input/output only supports parallel mode.)

Second display bit：

"C" (Clock) means that the Clk OUT output signal that follows is a 256fs clock at the sample rate. "L" (LRCK/WCLK) represents the LRCK/WCLK clock for the output.

Third display bit：

"n" (Non Swap) represents that the HDMI output DSD left and right channels comply with the Audio-gd standard. "S" (Swap) means that the left and right channels of the DSD are swapped with the Audio-gd standard.

Fourth display bit：

"1" represents that the PCM pin definition of the HDMI output complies with the Audio-gd standard. "2" represents the other pin definition (see description below).

Fifth display bit：

"A" (Auto) represents that the display turns off automatically approximately 10 seconds after stopping operation of any button. "n" (Non Auto) means that the display will remain on.

HDMI-IIS output setting instructions：

HDMI output mode 1：

The third bit is set to "n" (Non swap), the fourth bit is set to "1": HDMI definition in line with Audio-gd or PS.

HDMI output mode 2.

The third bit is set to "n" (Non swap), the fourth bit is set to "2".

HDMI output mode 3.

The third bit is set to "S" (Swap) and the fourth bit is set to "1".

HDMI output mode 4.

The third bit is set to "S" (Swap) and the fourth bit is set to "2".