Front board schematic
1, the power switch
2, input selection
4, 6.35 headphone output
5, the volume knob
6, 4-core XLR balanced headphone output (large)
Rear board schematic
1, TOS fiber input
2, USB input
3, I2S input
4, COAX coaxial input
5, 6 XLR balanced output right and left
7, 8 RCA single-ended output right and left
9, AC cable input
Good sound comes from good electronic components
The pre-stage tube adopts the American RCA metal encapsulation tube 6SH7 in the 1940s; the Swedish original customized Lundahl headphone amplifier special output; the British original custom-made power transformer; the coupling capacitor uses the German Mundolfo silver foil oil-immersed capacitor; The fever level Jinwei resistor is used; the signal switching switch and the volume control encoder are all made of ALPS fever products.
ES9038pro decoder chip
Adopt ESS company decoder chip ES9038PRO, ultra low distortion, high signal to noise ratio, large output current. The system clock uses an ultra-low phase jitter US Sitime active quartz crystal with a phase jitter of less than 0.5px. Regardless of the format of the LD-A1, the sampling frequency is high, which ensures smooth and phase-locked decoding.
2A3 ultra low distortion amp
LD-A1 with American RCA antique tube 6SH7 + Svallock JJ 2A3 single-ended pure class A ultra-low distortion headphone amplifier, the output power reaches 5W rms, the overall sound field, positioning, air feeling is unforgettable.
The LD-A1's full-range analysis is excellent, and it is modern, pursuing analytical and dynamic styles. Transient response is especially good, listening to any music will give a refreshing and transparent feeling.
The LD-A1 adopts the design of the power supply cow and the host split. The channels do not interfere with each other. The balance sensor and the extremely sensitive headphones can not hear the noise.
DSD64, DSD128, DSD256, DSD512 (2.8224-22.5792 MHz)
Decoding frequency response: 20Hz-20KHz+/-0.2dB
Amp frequency response: 5Hz-80KHz+/--1dB
Decoding dynamic range: DNR 132dB
32 ohm 3W
120 ohm 2W
Power consumption of this machine: 95VA
Volume: 350*290*230 (including tube height) mm