M2H has extremely high fidelity; its SQ is neutral. It will show how good or bad the recording is!
TECHNICAL HIGHLIGHTS
- Real Balanced ACSS Power Amplifier
- Applies the round-corner style chassis which has lower syntony or vibration. Between the transformers and signal amps resides a thick metal plate to avoid interference.
- Fully balanced design, the gain stages and pre-driver stages working on class A , built by discrete analog stages without any OPA or coupling caps in the signal channels.
- The output transistors stages work in high idle current state. The Diamond Cross output stage design avoids « switch distortion » as well as class A amps.
- Non- feedback ACSS analogue design
- 80 output transistors: « the King of transistors MJL4281/4302 »
- Support 250W X2 (8 Ohm) output, 500W x2 (4 Ohm)
- The capacitance of the whole machine reaches as high as 260,000 uF, powered by four R cores transformers (Total 1500W)
- Completely separated design, separated power supplies for the right and left channels.
- In total 4 groups of high-quality class A parallel PSU’s to power gain stages. To achieve a high S/N, the control circuit is powered with separate regulators.
- Analog inputs: XLR, ACSS
- Audiophile grade components, including DALE resistors, WIMA caps, custom order NOVER (UK brand) caps, all audiophile grade input & output sockets and gold IEC socket.
- Static mode storage control software to avoid interrupting the sound quality , the MCU output is inactive when no user operation is active.
INPUTS
- 1. XLR
- 2. ACSS (XLR 4-PIN )
OUTPUT
- Speaker Neutrik output IEC sockets.
« Linear Fidelity » technology
The Master 2H has special « Linear Fidelity » technology designed output stages . The output stages are designed without negative feedback but can keep the distortion very low and has an excellent ultra linear performance. On many power amp designs the output power determines the amount of distortion. Even when measuring a specific output power, the distortion level of the full frequency band already has a significant difference.
The blue line shows a frequency at 8 ohm 20W output of a well known power amplifier of round USD10k.
Different types of distortion also affect the sound. For example, if you are playing a piano, you can hear the difference between a brand A piano or a brand B piano due to the different distortion on the frequency band.
The more lifelike the rendering, so the better this distortion remains intact, the better you can perceive the differences between the A and B brands.
NON-FEEDBACK DESIGN
The applied negative feedback is done to reduce the distortion of an amplifier. A disadvantage of an amplifier with negative feedback is that it reduces distortion but also makes listening unpleasant. Also, the negative feedback power amplifier often has a good distortion result when measured with an ideal emulation load, but with real speakers, the electrical potential from the speaker through the feedback loop to the amplifier’s input stages can actually cause greater distortion.
The negative feedback power amp reduces the distortion, but the distortion increases as the output power increases, making the larger dynamic music sound loud and fire in your face while listening to the music.
Usually the non-negative feedback design has high distortion and is difficult to control, especially driver output stage operating under strong current condition. In our Master 2A design, the gain stages adopted ACSS technology, it is the design without negative feedback, but the original advantage of the very low distortion remains.
SPECIFICATIONS
SPECIFICATIONS | |
---|---|
Output power | 2x250W under 8 Ohm / 2x500W under 4 Ohm |
Output voltage | 58V RMS |
Input sensitivity | |
Frequency response | 20Hz – 20kHz to 0.01dB (XLR 8 Ohm) / 10Hz – 100kHz to -3dB (XLR 8 Ohm) |
SNR | > 120dB |
inputs | 2x XLR / 2x ACSS |
Exits | 2x Stereo terminal blocks (accepting bananas) |
Food | 4 transformers, including 2 R-Core |
GENERIC | |
Consumption | 250W |
Weight | 70kg (both blocks) |
Housing material | 100% Aluminum |
Color | Black |
Dimensions | 340 x 260 x 450mm (one block) |
Accessories | 2x Power cable |
Sorin –
I have received the M2H – they are brilliant indeed!!
Thanks a lot for all your great support.
Regards, Sorin
George –
I had a wonderful Friday night with my vinyl collection played through the Audio GD set-up .
I have my own reference LP’s to test the audio and the Audio GD combo HE1 +2H mono blocks passed with flying colors. I played Steve Ray Vaughan « Can’t stand the weather » album but mainly one song called TIN PAN ALLEY great blues guitar and the bass / drum on this song was just as if it was just played in the room. You were 100% right that the 2H would start to sound better every hour it ‘s played. it’s not boomy just natural as it can be. Now I can hear the full potential of my KOETSU black cartridge. Next I played « Kind of blue » by Miles Davis Again the trumpet of Miles is so real and the rest of the band just sounded awesome just simple wow . In a long time I Hadn’t had much « fun » in listening to music.
I have my nirvana with this Audio GD.
Greg –
After a long « burn in » (many hours of low volume listening) I came back to my listening CD / SACD I have to say I can now really distinguish between a ‘normal » CD and SACD or XRCD played on my cd player Yamaha CD S3000. Before it was not that clear even on my AA Amp II powered by the HE1. I Guess the ACSS link has a lot to do with this sound and make the music so natural and clear.
The experience is awesome anyway and I am very happy I bought it from you!
On the weekend I will play my vinyl LP’s and see how that will go.
I am so satisfied with this set-up and your service.
-Greg
Andreas (Sweden) –
I’ve been playing and having them on for a long time now. More or less since I got them.
It’s pure amazing. I tried a Lyngdorf 2170 as a pre amp and also as a amp (which is said to be in the upper class of sound) and still it can’t compete with these two. Amazing performance!
Tini vd B. –
Ik ben een voorstander van mono blokken dus ben rond gaan kijken voor mogelijke kandidaten die met de Ushers mogen spelen. Het zijn geen extreem moeilijke speakers om aan te sturen maar aangezien ik geen buren heb wil ik het volume nog wel eens wat opschroeven wat toch wat eisen stelt aan vermogen en controle. Merken als Levinson en Krell zouden leuke kandidaten zijn maar die stellen budget eisen die niet haalbaar of wenselijk zijn. Klasse D mono blokken zijn vaak wel betaalbaar maar qua muzikaliteit hebben ze mij nog niet kunnen overtuigen.
Als een versterker niet nieuw is dan zijn de eerste euro’s er al vanaf gespeeld dus ik ben ook maar eens op de 2ehandsmarkt wat gaan shoppen. Beperkte keuze, vaak nog behoorlijke vraagprijzen en je kent de historie van de apparaten meestal niet dus ook daar vond ik ook niet wat ik zocht.
Als jarenlange gebruiker van diverse Audio-GD DAC’s en voorversterkers surfte ik ook naar de Magna Hifi site want ik herinnerde mij dat ook zij mono blokken in hun assortiment hebben, de Master 2H. Op papier blonken deze meesters in ieder geval uit in formaat, gewicht en de hoeveelheid onderdelen in de wat saaie zwarte dozen. Omdat ik al behoorlijk wat rond had gekeken viel de prijs in vergelijking met de bekende(re) merken erg mee en zaten ze binnen mijn budget plannen.
Na wat mailverkeer en telefonisch contact met Jos van Magna Hifi heb ik de knoop doorgehakt en deze zware jongens besteld. Inmiddels zitten de inspeeluren er al op dus wordt het tijd dat ik mijn ervaringen ga delen.
De Master 2H op de Ushers is een zeer geslaagde combi. Vanaf het eerste moment voel je de autoriteit van de versterkers, het heeft kracht en controle. Het inspelen zorgde voor een rustiger hoog met veel finesse en doortekening. Ook bij hogere volumes blijft het netjes en wordt het nergens schreeuwerig of hard.
Het geluidsbeeld is geweldig, het komt mooi los van de speakers en bij goede opnames staat alles los van elkaar in de ruimte. Je beleefd de muziek.
De puntjes op de i waren overigens de ACSS in en uitgang op de voor en eindversterkers. Niets wereldschokkends maar wel een goed te horen verbetering tov de standaard gebalanceerde touwtjes.
Conclusie; ik ben erg tevreden. Onze Chinese vrienden hebben weer een kwalitatief hoogstandje af weten te leveren voor een (kilo)prijs die geen concurrentie kent.
Rest mij alleen nog Jos en Rob te bedanken voor de prima service!