Description

Leafaudio Black CMD29 Dual AK4499EX DSD Balanced Audio Decoder DAC Bluetooth (Blue VU Meter)

Precaution:
- When connecting the decoder to other devices such as ear amplifiers and power amplifiers, adjust the decoder's volume to 100 and use the back-end device to control the volume to achieve maximum dynamic effect.
- The default option for AMANERO sound card firmware is to support for WIN system playback of DSD512; If you need to support for DAPHILE system, please contact us before payment. (note: the two systems are not fully compatible)
- This machine is a pure DAC without headphone amplifier.
- The HDMI port is not a video port and can only connect to digital player or I2S input of the digital interfaces.

Improvements:
- Fiber optic and Bluetooth add input buffer circuits to improve the previously slightly poor low frequency situation.
- Balanced XLR output by adding 2 LPFs and buffering operational amplifiers to increase thrust and reduce output internal resistance.
- The voltage regulator circuit powered by the operational amplifier is changed to a high PSRR reference source, with low ripple reference level linear voltage regulation, which is 10 times lower than the original ripple and reaches the uV level.
- Adjust the output level to XLR 4V and RCA 2V RMS to increase adaptability.
- Adjust the left and right channels of IIS B port.

Features:
- The upgraded version has higher performance in high frequency, transparency and details than the standard version.
- This machine uses one AK4499EX decoder for each channel, and the two channels work independently. The decoding chip is designed with mirror symmetry to ensure signal symmetry and integrity to the greatest extent. Thanks to this concept, combined with various imported zero devices, this machine has extremely low distortion and signal-to-noise ratio, and the sound is pleasant and not noisy.
- The sound of AK4499EX is specially tuned, which may be different from other AK4499EX sounds. Its sound is between ESS9038 and CS43198, which has both the feel of CS43198 and the dynamic of ESS9038. After all, this is a current type DAC with a current output of up to 18MAP_P per channel, and the analog part of the chip has a power supply voltage of up to 5V (ES9038 is 3.3V).
- All aluminum case, with an overall size of 360MM in length, 101MM in height, and 240MM in depth.
- Input interface: coaxial, fiber optic, USB, Bluetooth5.1, two sets of IIS
- Output interface: XLR balanced, single ended RCA
- USB, Bluetooth, modular design, you can freely choose whether you need it or not
- The screen uses IPS LCD screen and for Apple remote control, which can control volume, mute, input switching, filter adjustment, and other functions
- MSP low ripple field-effect transistor super-linear voltage stabilizing circuit

Material:
- Transformer: 2 sealed 25W transformers for TALEMA, digital, analog, independent power supply.
- Clock crystal oscillator: 1 audio specific ultra-low phase noise crystal oscillator.
- Voltage regulator chips: 2 LT3042 ultra-low ripple LDO chips, 3 sets of primary voltage regulators, 15 sets of secondary LDO low ripple voltage regulators.
- Filter capacitors: 4pcs 4700uF main filter capacitors and numerous capacitors for Philips/Panasonic.
- Operational amplifier: standard configuration includes OPA1656*4+OPA1655*2 operational amplifiers.
- Bluetooth: QCC3084 Bluetooth module, supporting for LDAC and APTX-HD.
- USB: default configuration with Italian module for AMANERO.

Bluetooth Connection Setting:
- Connect the Bluetooth antenna that comes with the device (it can be installed on the antenna base without tightening it, otherwise it may cause the wires inside the base to rotate, resulting in a disconnection and inability to receive signals).
- Adjust the input selection until the display shows "BT".
- Taking the phone as a column, enter "Settings" - "Bluetooth" and click "Search for Devices". Later, you will search for "QCC5215 SPDIF" and then click "QCC5215 SPDIF". The phone will automatically pair and connect successfully, and "Connected to Media Audio" will be displayed in the "Paired Devices" section, and then you can play the song.
- It is recommended to use a phone that supports for ATPX, APTX-HD, and LDAC functions, with excellent sound quality. (Different mobile phones also have significant differences in Bluetooth sound quality)

Specification:
- RCA output distortion: 0.0001%
- SNR: 122dB
- RCA output amplitude: 3V
- XLR output amplitude: 6V
- Coaxial: support for PCM up to 384K, DSD128 DoP input
- Optical: Support for PCM up to 192K, DSD64 DoP input
- USB and HDMI: support up to DSD512 source code, PCM768K/32bit
- Bluetooth: 44.1K (for APTX-HD), 96K (for LDAC)/24bit
- Standby power: 1.5W
- Static power consumption: 18W

Package Included:
- 1 x Host
- 1 x Remote Control
- 1 x USB Data Cable
- 1 x Power Cord
- 1 x Bluetooth Antenna

FAQ:
Q: Why does the machine generate heat?
A: Due to the use of 6 Class A operational amplifier modules and MSP linear regulator circuits in the machine, heating is a normal phenomenon.

Q: Will the volume control of the decoder affect the sound?
A: This machine adopts MCU chip to attenuate the output sound output amplitude of 4499 chip, which is a digital volume control and not a traditional analog volume, so it will not have an impact on the sound.

Note:
- The Bluetooth antenna can be installed on the antenna base without tightening it, otherwise it may cause the wires inside the base to rotate and cause a disconnection, making it impossible to find the Bluetooth.
- If you find that the Bluetooth device cannot be paired, please turn off this DAC for 1 minute and then turn it on and pairing again.
- When playing FOOBAR, it will monopolize the device for AMANERO. At this time, other software is not allowed to sound. To use other software, FOOABR can only be stopped or closed, and set the device for AMANERO as the default device. (Exclusive can also be canceled in the attribute for AMANERO).
- Only mono is available during Bluetooth playback. This situation is usually when the LHDC function is turned on (as this Bluetooth supports for LDAC and does not support for LHDC, there may be conflicts, so turning off the LHDC function will makes it normal).
- Pay attention to the protective film on the surface of the organic glass, which is not scratched, and do not misunderstand.
- If there is no sound, it is recommended to unplug the power cord for 5 seconds and then power on again.