Aurender X725 Manual



Please read the following instructions carefully before setting up the Aurender Music Player.
•Be careful not to drop or mishandle the device to avoid internal damage.
•Do not disassemble the device.
•Do not expose device to oil, dust, water, high humidity, or smoke.
•Keep the device in a well-ventilated area and ventilation openings free from obstruction.
•When cleaning, use only a soft cloth. Keep out of contact with water or other liquids.
•All servicing must be performed by a qualified technician, or the warranty will be voided.
•Unplug power cord during severe lightning or when unused for a long period of time.
•Unplug the device from the outlet only after completely turning off the unit.
•Always turn the power off before connecting or disconnecting any cables.
•Always make sure that the AC voltage matches the voltage stated in the rear panel mains inlet.
•Ensure that the left and right speaker channels are properly connected to prevent reversed polarity.
•Care must be taken not to short the speaker connections in order to prevent damage to the device.



• Place your device on a flat, horizontal, and stable surface.
• Keep away from heat sources, such as radiators.
• Do not stack other products on top of the Aurender.
• Allow space around the device for ventilation.
• Do not place inside an enclosed cabinet.


Front Panel

1. Remote control IR sensor

Power On/Off, Mute, Volume Up/Down, Previous, and Next can also be
controlled by using the included remote control.

2. Volume control knob

Volume can be adjusted from -96 dBFS to 0 dBFS in 0.5 dB increments with
the initial factory setting being -60 dBFS.

3. LED light

When audio is played through the USB input, the LED light will turn white.
When audio is being played through SPDIF input, the LED light will turn
green. If the volume is adjusted using the remote control, then the LED light
will flash intermittently.


Rear Panel

1. Right Speaker Output

2. USB 2.0 type B connector

3. Optical SPDIF input

4. Left Speaker Output

5. AC Power Switch

6. AC Inlet

The maximum output of the Aurender X725 is rated at 250W per channel at 4 Ω. Caution should be taken when connecting the speaker cables. The X725 should always be turned off before making any connections and ensure that the left and right speakers are connected to the proper binding posts. The direct current received through the USB input is less than 5V 100mA. The mains voltage of the Aurender X725 can be set at either 220V or 110V AC at the factory. Products set to accept 110V must not be labelled 220V.


Internal Components

1. Front board

2. Linear power supply board

3. Audio board

4. Rear board

5. Power amplifier module

6. AC power inlet

7. Binding posts

AC power is sent from (6) to (2) by a connecting cable (CABLE_X725-1-M1), and then from (2) to (5) by another cable (CABLE_X725-1-J2 for 220V, or CABLE_X725-1-J1 for 110V). The digital signal from the USB and SPDIF inputs are sent from (4) to (3) by a connecting cable (CABLE_X725-3).
The FCC cable (CABLE_X725-2) is used to connect (1) to (3) in order for the LED light to turn on when there is a signal received from the IR sensor or when the volume is changed.
A cable (CABLE_X725-4) connects (2) to (3) and provides DC power to the analog audio signal processing section.
A cable (CABLE_X725-5) connects (3) to (5) in order to receive the line input of the power amp.
A cable (CABLE_X725-6) connects (5) to (7), the power amp’s speaker outputs. Caution must be taken to ensure that the connectors match exactly when soldering (7). Pin 1 of (6) connects to R+ of (7), Pin 2 of (6) connects to R- of (7), Pin 3 of (6) connects to L- of (7), Pin 4 of (6) connects to L+ of (7).

Main Features

•Digital Audio Input : USB Class 2.0 / SPDIF (24bit, 192kHz)
•Supported Format : AIFF, ALAC, FLAC, WAV, M4A, APE, DSD (64, 128)
•Remote Control : IR, I-PAD or Android tablet or smart phone via X100
•Volume Control Range : -95dB ~ 0dB
•Output Power : 2 x 230W @ 1% THD+N, 4ohm
•THD+N : 0.008%(typ.) @ 1W, 8ohm, 1kHz
•Frequency Response : +/- 0.5dB @ 20Hz ~ 20kHz
•Digital I/O :1 USB 2.0, 1 optical SPDIF
• Power Supply : 200 ~ 240Vac 60/50Hz 5A (AUR-X725)
100 ~ 120Vac 60/50Hz 5A (AUR-X725-A)
•Dimension (Weight) : 215 x 55 x 355 mm (4.7kg)
/ 8.5 x 2.2 x 14.0 inches (10.4 lbs)

Block Diagram

Figure is a function block diagram of the X725 and shows the relationship among the various components which consist of an USB 2.0 Audio
Processor, DAC & Conditioner, Power Amp, Power Supply, connectors and other interfaces.

X725 Operation

The Aurender X725 is an all-in-one DAC, pre-amplifier and power amplifier and designed to simplify the task of configuring and setting up an audio system. With the wide range of digital audio sources (music servers, digital audio players, CD players, Blu-ray players, DVD players, etc.) available today, there is a need for an all-in-one DAC, pre-amplifier and power amplifier. By combining the DAC, pre-amplifier and power amplifier, only the music sources and speakers need to be connected. With digital audio inputs, there is no need for left and right channels to be connected. Just a simple USB cable or SPDIF optical cable, power cord, Ethernet cable, and a pair of speaker cables are all you need. An audio system designed around the Aurender X725 and X100 music player will use fewer cables and fewer audio components than a traditional analog based audio system, and can be set up much quicker and more easily.
The digital audio signal received from the USB and optical (SPDIF) audio inputs are converted to an analog signal by the internal DAC. The pre-amplifier section controls volume and source selection, and the power amplifier amplifies the audio signal to power the speakers.
In the Figure, a system diagram of the Aurender X725 connected to the X100 music player and speakers. By combining the DAC and amplifier into one component, the Aurender X725 enables for simple set up and connection, in addition the Aurender X725 and X100 can be controlled through the Aurender App for iPad, making it easy to quickly find, browse and play high resolution digital music files.


inputs, converts it to analog form, amplifies it and outputs the signal through the speaker binding posts to drive speakers. With the X100 and X725 connected as shown in Figure. using the USB 2.0 port, all functions of both the X100 and X725 can be accessed using the Aurender App for iPad. When volume is changed or other features of the X725 are used, it will be even be shown on the X100 front panel LCD display. The X100 and the X725 are designed to be the foundation for a very compact and very convenient audio system. 

The Optical SPDIF can also be connected to other digital sources (CD, DVD, Blu-ray) so that the audio can be enjoyed through the X725.

1. AC Power Connection

The AC power cord should be connected to the AC inlet as shown in Figure. The mains power voltage must match the voltage marked next to the AC Inlet. Products marked 110V must be connected to 110V mains power and products marked 220V must be connected to 220V.

2. USB 2.0 Cable Connection

The USB Audio Class 2.0 port which is marked “USB IN” as shown in Figure should be connected to a digital audio source, such as the Aurender X100, using an USB 2.0 cable with type B connector.

3. Speaker Connection

In Figure 8 are pictured the speaker binding posts which are marked “ SPEAKER OUT” and “- ○R –“, “- ○L –“. Speakers must be connected
properly to the binding posts making sure that the polarity is not reversed.

4. Using the X725 with USB connected (X100)

•With the power switch in the OFF position, connect the AC power main to the X100 and X725 using the provided AC power cords.
•Connect the X100 to the network using a LAN cable.
•Connect the X100 and X725 using an USB cable.
•Connect the speakers to the X725 speaker binding posts.
•Turn on the power to the X725 and X100.
•Select songs to play by pressing the song title on the iPad to send it to the Queue. (For more details, refer to the X100 User Guide).
•Volume, Next Song, Previous Song, Play, Pause and other functions can also be controlled using the remote control or Aurender App for iPad.

5. Using the X725 with SPDIF

The Optical SPDIF input can also be used to listen to other audio sources in addition to the USB input
• As explained in paragraph 2.2, DVD, Blu-ray players and other digital sources can be connected to the X725 using the optical input in addition to the USB input.
• On the Aurender App for iPad select SPDIF in the Source selection menu.
• Volume, Next Song, Previous Song, Play, Pause and other functions can also be controlled using the remote control or Aurender App for iPad.

Remote Control

The Aurender X725’s remote control is shown in Figure 11. At the bottom of the remote control is a small slot, pull the slot and insert the CR2032 with the creased side up.

1. Mute button

Mutes audio when pressed

2. Power On/Off button

Turns off the Aurender X100 when connected using the USB cable (Only works with the Aurender X100 Player).

3. Volume/Previous/Next button and Play/Pause button

Press top side of the outer ring to increase volume and the bottom to lower it. To play the previous song, press the left side and to play the next song, press the right side. Pressing the center ring will play or pause the selected song (Only works with the Aurender X100 Player).

4. Back button

Stops play and replays the selection (Only works with the Aurender X100 Player).

5. Menu button

Switches inputs from USB to Optical SPDIF (Only works with the Aurender X100 Player).

6. Volume up button

Press to increase volume.

7. Volume down button

Press to decrease volume.