The non negative feedback output drive stages had applied "Linear Fidelity" technology (Appling for patent):
The Master 2H had applied the "Linear Fidelity" technology on the output drive stages . The output drive stages had not negative feedback but can keep the distortion low and steady, and had the ultra excellent linear performance.
In some lot power amp designs, the distortion had big different level on different power output level , even on one power output level, the full frequency band's distortion level had quite different , especial the low and high frequency .
The blue line of below diagram show the distortion to frequency at 8 ohm 20W output of an well known power amp which worth around USD10k.
The below diagram show the most musical instrument frequency bands . The frequency band had cover from 20Hz to 4KHz .
Different distortion must effect on the sound . For example, if playing piano music recorder, cause by the larger different distortion on the frequency band, you can hear the low frequency band like playing a brand A piano, the middle frequency band like playing a brand B piano, and the high frequency brand like a brand C, the music recorder like the different brand pianoes playing together.
Below diagrams had show the distortion on the Master 2H.
The negative feedback applied, most is for reduce the distortion.
Some people dislike the negative feedback design on the power amp, it reduce the distortion but make the listen unpleasure.
The negative feedback power amp had good distortion result on emulational load measure, but while connect the real speakers, the electric potential of the speaker can through the feedback loop feed to the amp input stages cause the larger distortion.
The negative feedback power amp even reduce the distortion , but the distortion increase while output power increase, this cause the larger dynamic music sound become harsh and fire to your face while listen the music.
Usually the non negative feedback design has high distortion and difficult to control, especial the drive output stage which is work under strong current state.
In the Master 2H design, the gain stages have applied the ACSS technology, it is the non negative feedback design but it's native advantage has very low distortion.
The output drive stages had applied the " Linear Fidelity " technology .
The overall design in the Master 2H is non negative feedback design.
From the diagrams, the amp has quite flat and steady distortion on the frequency band from 20Hz to 5KHz, keep the same sounding character while playing the musical instruments .
The distortion roll off a lot start at 5KHz, even lower than some amps which is depend on the negative feedback , it obvious show the supper linear performance of the amp.
Compare the diagram, the upon diagram has 0.015% distortion at 20KHz , the below diagram has 0.0018% distortion on 20KHz.
The ultra low distortion had not depend on the negative feedback, but depend on the ultra linear of the amp, so it's sound very transparency and analogue.
On the different output power level , the amp has similar distortion level, while listen with softer and dynamic music, it offer the same sound character without harsh .
We test 5 unit products, the performance is similar ,we post the worst diagrams in below .
THD+N at 8 ohm 10W
THD+N at 8 ohm 50W
THD+N at 8 ohm 100W
Fully balanced design, the gain stages and pre-driver stages work in class A, built with discrete analog stages without any OPA or coupling caps in the signal channels.
The output transistor stages have supper excellent linear, it sound like the pure class A design but without the high heat of the pure class A design .
2 analog inputs: XLR / ACSS
Applies 80 pieces of ON Semiconductor transistors. Supports 250W X2 (8 Ohms) output.
The capacitance of the whole machine reaches as high as 140,000 uF, with two 750W circle core and two R cores transformers (Total 1500W) and separate power supplies for the right channel and left channels.
A total of 4 groups of high-quality class A parallel connection PSU's supply the gain stages.
Applies all audiophile grade components, including DALE resistors, WIMA caps, custom order NOVER (UK brand) caps, all audiophile grade input & output sockets and gold IEC socket.