L1387A 8X Hifi decoding amp integrated machine Electrical parameters:: Digital input: coaxial, optical fiber, USB () Analog output: RCA analog output. Coaxial and optical fiber input code rate: 44.1K -192K (you are not mistaken, it is 192K, please use coaxial if possible over 96K). USb input code rate: 44.1K-48K. Analog output level: >2Vrms. Pure nail amp output power (1KHZ sine wave equivalent undistorted power): 80mW/300 Euro, 200mW/120 Euro, 650mW/32 Euro. Power supply: AC100-220V. Physical parameters: Volume: width 106 height 28 depth 120 (mm) Weight: 400 grams Random accessories: DC15V high quality DC power supply. Supporting high-quality linear power supply, more dynamic, smoother sound, and higher signal-to-noise ratio, please join the shopping cart together, notify the owner to modify the price, minus the difference between the random power supply: http://item.taobao.com/ item.htm?spm=0.0.0.0.gukWhc&id=43281727624 Circuit characteristics: Optical fiber, coaxial, USB input; line output, headphone output, a full-featured decoding amp all-in-one machine, creating the most valued audio myth. CLC filtering + two-stage voltage stabilization + parallel voltage stabilization, a good sound foundation for decoding-power supply . MCU soft-control digital receiving: the microcomputer dynamically optimizes the parameters and adjusts the phase detector of the receiving chip (CS8416) to automatically adapt to the input code rate and minimize jitter. At the same time, it can realize the selection of input source by tapping the buttons, which is beautiful and upscale. Eight pieces of TDA1387, after many comparisons, the sound of TDA1387 is the closest to the same door TDA1541, I can conclude from my unanimous praise of the adapter board, 1387 after parallel connection, the current driving capacity increases, fundamentally solved the dynamics with TDA1541 , The gap in density. The digital part has two-way series voltage stabilization, and the MCU and receiving chip have independent power supply to ensure the lowest jitter. The three-way parallel voltage regulator supplies power to the analog DA chip and LPF respectively. The quality of the parallel voltage regulator is much better than that of the LM317 and the so-called servo power supply. The disadvantage is low efficiency, but it should be ignored in the environment of decoding such small current. Integrating the classic 1969 pure nail amp, pure nails have the advantages of warm sound, low distortion at maximum volume output, good damping, and perfect control. Even the HD650 and K701 can be promoted in different ways. Perfect wiring, digital and analog multi-level decoupling, strict distinction. A large number of fever components, the configuration of this machine is already luxurious for 1387, please see the physical picture and the list of components. The components are for good sound, not for burning the device, so I don’t want to say more and know it.Instructions for use: The following interface functions from left to right are: RCA line output: can connect external power amplifier or multimedia active speaker. USB: used to connect to a computer, also compatible with tablet computers or set-top boxes (some set-top boxes may not be compatible) Optical fiber digital input Coaxial digital input DC15V power input switch The front panel interface functions from left to right are: Sel key: It is used to select coaxial, optical fiber and USB input cyclically. Each time the button is pressed, the indicator light moves. Indicators: COA, OPT, and USB respectively indicate the currently selected input source, and the Lock indicator indicates that the input signal is locked. 6.35 Headphone port is used to connect headphones. The volume knob is used to control the output volume of the headphones (the output of the RCA line at the back is not controlled)About sound quality: TDA1543's sound is very close to the same door TDA1541 orientation, ethereal charm, rich analog sound, mid-frequency is very sweet, unlike the current top chip, this decoding is a listening type, she can not help you analyze music, but it can make people I forgot to turn off the machine for a long time. If you are tired of too much digital sound and the so-called high resolution, you may wish to listen to L1387DAC 8X, which may surprise you. The more valuable 1969 pure nail amp has created a perfect value desktop headset system.