General Information
PRODUCT DETAILS:
Please NOTE:
▶ On the basis of retaining the advantages of PD4. PD4 Plus added 64-Level independent volume control. Increased output power to 2*310mW@32Ohm.Modify the appearance to be visible inside.
▶ This product has the function of automatically powering on when connecting the headset and automatically powering off when disconnecting the headphone. It is better to insert the headphone first before using it.
▶ This product is an audio usb DAC headphone Dac&Amp and has no microphone function,so headphone mic cannot be used.
▶ There is a protective film on the acrylic screen,you can remove it when necessary.
▶ Please feel free to contact us if you have any doubt.
Features:
▶ Built-in 2 independent decoding chip CS43131 and USB audio bridge chip SA9312.
▶ Add 64-Level independent volume control.
▶ Increase output power to 2*310mW@32Ohm@4.4mm@High Gain.
▶ Change round edges & acrylic translucent window.
▶ Built-in 2 CRYSTEK crystal oscillators(there is one on each side of the PCB board).
▶ Adopt multiple ultra-low noise LDOs
▶ With the high/low(0.9V to 4.2V) gain button,which can perfectly adapt to all headphones/earphones from 16Ω to 600Ω with strong power and rich sound details.
▶ Perfect support for USB exclusive output of mainstream audio play software such as Tidal, Hiby and Viper.
▶ Support up to PCM384KHz/32Bit and DSD256 digital audio decoding.
▶ Coming with 4.4mm fully balanced output and 3.5mm stereo output.
▶ With Hidden PCM and DSD lighting effects,PCM green light,DSD red light(choose DoP output when playing DSD on the Phone)
▶ Only 22g ultra-light design,very easy to carry,and designed with buckle.
▶ Ultra-high precision metal frosted process,very comfortable hand feel.
▶ Android/iOS/Windows/Mac all support(suit for win10 1703 or above,Android 5.0 or above,iOS 13.0 or above at Max PCM384KHz/32Bit,DSD256.win7 need driver,please contact us if you need it. iPhone 15 series also support)
Button explanation:
▶ ⑤ Botton: pause/play / next song(double click) / previous song(triple click)
▶ ⑥⑦ Botton: volume+ / volume- (64-Level independent)
▶ ⑧ Botton: high / low gain switching.
High Gain: 4.4mm: 4.1Vrms output max. 3.5mm: 2.1Vrms output max.
Low Gain: 4.4mm: 2.1Vrms output max. 3.5mm: 1.1Vrms output max.
Parameters:
▶ Decoding Support: PCM 44.1-384KHz 16/24/32Bit DSD 64/128/256
▶ Output: 4.4mm balanced + 3.5mm stereo
▶ Frequency Range: 20-20KHz
▶ 3.5mm Output Power: 2*138mW(High gain) @32Ω Load
▶ 4.4mm Output Power: 2*310mW(High gain) @32Ω Load
▶ Headphone Impedance Suit: 16Ω-600Ω
▶ THD+N: <-103dB@4.4mm <-100dB@3.5mm @1kHz 0dBFS 32Ω Load
▶ SNR: >130dB@4.4mm >125dB@3.5mm @1kHz 0dBFS 32Ω Load
▶ DNR: >130dB@4.4mm >125dB@3.5mm @1kHz 0dBFS 32Ω Load
▶ Size: 57*25*10mm
▶ Weight: 22g
Package:
▶ 1 * AkLIAM PD4 Plus USB Dac&Amp
▶ 1 * USB C to C Cable
▶ 1 * USB A to C Adapter
▶ 1 * User Manual
▶ 1 * Certificate
Q&A:
▶ How to use this USB Dac&Amp?
This product has a load detection function, and it will only be powered on when both input and output are connected simultaneously.
▶ What's the difference between PD4 Plus and PD4?
PD4 Plus increased output power to 2*310mW@32Ohm@High Gain@4.4mm output,64-Level independent volume control is also added,at the same time, the appearance adopts some acrylic materials.
▶ What is the biggest feature of PD4/PD4 Plus?
Maximize the restoration of original dynamics/Tone & Timbre/Note Weight/Density/Technicalities at extremely low power consumption,according to data from the internationally renowned USB Dongle testing laboratory, the sound quality of PD4 is already very close to that of iBasso DCO4Pro, but the power consumption is only half of it.
▶ Why PD4 Plus using 64-Level independent volume control,not 100-Level?
According to multiple tests by the engineers, the 64-level volume adjustment is already delicate enough, combined with high and low gain, to perfectly match all headphones within 600 ohms. If using 100-level, it will require many operations and affect the user experience.
▶ What is the default position for independent volume after startup?
After turning on, it defaults to the middle position, and users can increase/decrease the volume according to their own needs.