By chance, a friend from Taiwan recommended this circuit to me. He is an experienced headset player, and since he got this circuit, he wanted to complete it, but because he was busy with work, he commissioned us to complete it for him. The condition is that he provides me with a complete and correct circuit diagram, and I just send him a machine after finishing it.
1. The circuit of this machine is derived from Dynalo circuit
HeadAmp drives the headphone amplifier of the dynamic machine. The circuit design is derived from the pure class A fully balanced headphone amplifier circuit published by Kevin Gilmore on the Internet in 2001; a few years later, Kevin Gilmore launched an improved version with a higher output power, which he called "Dynahi" , And the original version in 2001 was called "Dynalo". Justin Wilson, the founder of HeadAmp, uses this set of amp circuits as a basis to design mass products. After optimizing the circuit in 2005, the best-selling model GS-1 was designed; the following year, the GS-X with power separation and balanced output and input was introduced.
Since then, the product architecture of HeadAmp in the landline has been basically established: a flagship model with separate power supply, and a sub-flagship with a single box. This is true whether it is moving coil or static electricity. Generally speaking, the amp of electrostatic headphones can be pushed well, and it is not a problem to push other headphones.
2. Highly transparent and extremely pure sound quality
In addition to the abundant driving force, the sound quality of this unit is also impressive. With its pure texture without any impurities, it is no wonder that many people are obsessed with pure Class A amplifiers. If this kind of sound quality is to appear on two channels, it may cost more than ten times. In addition, compared with the gain level, some amps have high gain design in order to promote the more difficult-to-drive second machine, but the sound quality will be sacrificed because of this; the high and low gain of this machine will not have any deterioration except the sound quality In addition, even the difference in volume between the two, such as the difference in cohesion, is extremely slight. Just like the official statement, the design of high and low gain is just to increase the range of volume change.
3. It can drive a variety of fever headphones to show different tones
The highly transparent sound is also the strong point of this machine. Personally, I didn&x27;t make any sound beautification, but directly decided the outcome by performance. Driven by a high degree of transparency, the characteristics of each of the four models are exposed to the sun, clearly identified.
Like the K701, it has a special temperament, and it is especially beautiful when playing the violin, but the low frequency volume is obviously less.
The sound characteristics of HD580 and HD800 can give people a sense of inheritance of "sure enough headphones of the same brand", but the HD800 is a late-out headset after all, with significantly faster response, super-large sound field, and better overall frequency response performance. Some earphone players will use "Sennheiser" to describe the characteristics of early Sennheiser earphones like HD580. However, whether HD580 or HD800 are driven by this machine, they are extremely transparent, with clear lines, and there is no longer any shadow of yarn.
As mentioned earlier, the HE1000 processes the low frequency range closer to the fluctuation and layering of two channels.
The schematic diagram of this machine is as follows:
Technical specifications of the whole machine:
Signal input: 2x RCA, unbalanced
Input impedance: RCA: 68kΩ
Frequency response: 0-50kHz (-0.5dB)
Dynamic range: >116dB (A weighting)
Noise floor: <-103dBu (A weighting)
THD+N(1kHz 0.75W @100Ω): <0.00065%
THD+N(1kHz 1W @32Ω): <0.001%
Channel crosstalk: -107db (1kHz)
Headphone output: 1x 6.35mm TRS Jack
Power supply voltage: 230V AC/ (110V can be customized)
Power consumption: ≤26VA
Dimensions: 320 wide X62 high X308 deep
Output power: 530 milliwatts (600 ohms); 750 milliwatts (300 ohms); 1200 milliwatts (100 ohms); 1500 milliwatts (50 ohms); 2400 milliwatts (32 ohms); 4700 milliwatts (8 ohms)
Whole machine weight: 4.6KG (The express service provider calculates the weight according to the size after packaging, so the weight is different) The packaged item only has one host