Musmy a75 clone (not a review)

[ryan74701]

 

[Tovarich007]

IIRC VW Audi did bring suit against a Chinese manufacturer for making very close copies of their vehicles albeit they did not use the Audi name or logo on them. They lost.

This suit took place under which state legislation and court ?
It all depnds on the judge interpretation and the subjective importance of style or technical "cloning".

 

[Mart68]

This suit took place under which state legislation and court ?

In China.

 

[Smithlog]

If anyone is interested in seeing the internals of this this Musmy A-75 here they are and yes I’m aware that the Vu meters say “pean” they never fixed this mistake on this product, there is a newer version of this model out that is twice the price for some reason.


A-75 technical parameters：
1： Rated continuous output power (20HZ-20000HZ)
Pure Class A: Stereo sound：
480W X2 1 ohm output
240W X2 2 ohm output
120W X2 4 ohm output
60W X2 8 ohm output

Fully balanced bridging：
960W X2 2 ohm output
480W X2 4 ohm output
240W X2 8 ohm output

2： Frequency response：
Continuous rated output ：20-20000HZ +0 -0.2db
1W output： 0.5-160000HZ +0 -3 dB
3： S/N signal-to-noise ratio full frequency band 118dB
4： Total harmonic distortion: 0.05 2 ohms 0.01% 8 ohms
5： Input impedance: 40K (balanced input), 20K (RCA input)
6： Input sensitivity: 0.87V rated continuous average output
0.11V output 1 watt power
7： Gain attenuator: MAX -3dB -6dB -12Db
Corresponding magnification: 28 25 22 16
8： Damping coefficient 1000
9： Amplification factor of 28dB
10： Static power consumption 260W, maximum power consumption 520W
11： Overall size 430W * 225 H * 500 Dmm
12： Net weight 28 (kg)

Features:
●Class A output, 120W4 Ω × 2 stereo sound

●The output adopts 12 field-effect power transistors per channel, which can drive impedance as low as 1 Ω.

● The input adopts an exclusive white master developed fully balanced low noise module, which can greatly expand the frequency
response of music, improve sound clarity and intensity

●The voltage amplification section adopts two sets in parallel to reduce input noise and improve dynamic range.

●Adopting DC stabilization technology to ensure stable operation of the power amplifier.

● Add (220V) voltage isolation technology to effectively isolate DC from entering the transformer.

“A-75 includes an upgraded version of the "MCS+circuit" with an initial slow charging amplifier circuit equipped with "MCS", an improved version of the multi-stage parallel circuit design, combined with a current feedback design, to ensure linear response at each level. The amplification unit circuit is connected in parallel to reduce noise, and a DC stabilized power supply is installed in the drive section and MCS+circuit to improve SN ratio and sound purity. The high-efficiency large transformer is stored in a metal cover, combined with a "super large pond" filtering group, to provide sufficient and stable power supply. The amplifier part adopts a fully balanced amplification circuit design, with 12 high-power field-effect transistors used for amplification output ineach channel, achieving high-quality and high driving force. It provides pure Class A 60W x2 (8 Ω), 120W x2 (4 Ω), 240W x2 (2 Ω), and 480W x2 (1 Ω) true power amplification outputs. Provide powerful power output and super strong driving capability.”

I’m going to hook it up this afternoon at some point.
Product is easy to find on alibaba or AliExpress. View attachment 492603

Thanks for the detailed look, impressive specs on paper, especially the claimed Class A power and 1-ohm drive. Curious to hear how it performs once you get it hooked up.

 

[Jon L]

Buy the cheapest capable AMP you can find, that delivers the power you need, and invest the rest in equal terms to the speakers, DAC and Pre-Amp. Thats how you maximize your budget. Room treatment excluded, of course. That should be a seperate endavour.

This is pretty good advice for most peoples' systems. For those who own poorly designed speakers, different amps will sound different, i.e. large electrostat speakers that present essentially a dead-short impedance to amps at high frequencies.

 

[dlaloum]

It's not a copy. That's the whole point I'm making. It's influenced quite heavily by the design of the Elan, exactly the way the Musmy styling is influenced by Accuphase.

That is not illegal to do and it happens all the time. Now if it was superficially at least an exact copy possibly Accuphase could bring a civil suit and it would be up to a judge to decide, but if you compare it to real Accuphase it's clear that it is some distance from a close copy of any of their amps.

IIRC VW Audi did bring suit against a Chinese manufacturer for making very close copies of their vehicles albeit they did not use the Audi name or logo on them. They lost.

Ford had a partnership with Chery (I think, from memory), and found a Ford design popped up as a Chery - they went to court and won, the Chery version was an exact copy of a specific set of blueprints - but the blueprints weren't the final version and included some faults/flaws, which Chery had indeed reproduced and included in their manufactured copy....

(I found out about this story, when I spent a couple of years working for GM....around 2004-2006)

 

[dlaloum]

This is pretty good advice for most peoples' systems. For those who own poorly designed speakers, different amps will sound different, i.e. large electrostat speakers that present essentially a dead-short impedance to amps at high frequencies.

They are not "poorly designed" - like everything in Audio it is a balancing act between factors....

Your preference for a specific balance, does not make others differing choice "wrong" or "poorly designed" - it merely means that they were designed with specific amplifier requirements in mind.

The issues aren't at the design stage - but at the marketing stage, when sales types try to present such designs as suitable for "standard amps" - so as to broaden their market.

The legendary Quad ESL (57) would self destruct if any amp fitted to it used too high a voltage (35V from memory) - resulting in ARC'ing...
But it worked wonderfully well with either the Quad II valve amps or the Quad 303 - both of which were specifically designed for the 57's.

Nowadays speaker designers avoid that issue by making "active speakers" - and yes they may well present 1ohm loads to the internal amplifier, but that hardly matters as the internal amplifier is designed and specified for the specific requiremens of that speaker.

Back in the day - Quad was selling "systems" - they were well matched speakers, amps, preamps, tuners ....
but then the ignorant (and I include myself in that category, and my early destructive experiences with the Quad ESL!!) - would try to "upgrade" using alternative amps... without understanding what was required. Knowledge is a valuable thing - and nowadays with the web and forums like this one, we have the opportunity to collect some of that knowledge without destroying speakers/amps....

 

[Tovarich007]

In China.

No surprise.
I guess the result of this lawsuit could have been different if it has taken place in Germany or another EU country

 

[Snoopy]

I have both the D5 Pro and D9 Pro Master Edition Dartzeel clones and several Class D AMPs. The D5 Pro is already a superb AMP and the D9 Pro Master sounds exactly the same. The Class D also sound the same, given the same source (DAC and Pre-Amp). I wasted close to 1000 Euros just to get the supposedly better D9 Pro Master Editon AMP from Ali, only to find out that it sounds exactly the same as my D5 Pro and all Class D AMPs that I also own. Thats when I realized, that all AMPs sound the same. The DAC and Pre-Amp are much more important. So this Accuphase clone will NOT sound any different from the original, that costs 20 times more. I can personally vouch for that. I say this again and again. Buy the cheapest capable AMP you can find, that delivers the power you need, and invest the rest in equal terms to the speakers, DAC and Pre-Amp. Thats how you maximize your budget. Room treatment excluded, of course. That should be a seperate endavour.

And for the money you have spend on those 2 amps that are just clones, you could have gotten a nice refurbished vintage amp or a new Class D amp with all bells and whistles.

 

[Mart68]

No surprise.
I guess the result of this lawsuit could have been different if it has taken place in Germany or another EU country

Quite possibly but I suspect the thinking was that only a favourable judgement in China would actually have stopped production.

 

[Tovarich007]

Quite possibly but I suspect the thinking was that only a favourable judgement in China would actually have stopped production.

IMO, it was a bit naive from Audi to think the jugment in China could be favoarble and, if ever it could have been favorable, that the production will eventually be stopped.
Anyway, this kind of justice is quite unfair toward industries who invest in R&D, styling and innove, and too much protective toward those which clone and copy.

 

[Jon L]

They are not "poorly designed" - like everything in Audio it is a balancing act between factors....

I think Quads are "workable" and amps exist that sound good with them. The "poorly designed" stuff I'm referring to include examples like certain Martin Logans that dip to as low as 0.25 Ohms (!) in high frequencies.

 

[Scrivs]

It’s a small thing, but having to see “Musmy” and “pean” on the daily’s not for me. The mutilation of English is always good for a chortle, but not in these specific cases. YMMV.

 

[Scrivs]

I keep thinking “Mumsy” now. It’s “Musmy,” correct?
In the SU-X ballpark

 

[Dnemes1s]

Still havent gotten around to getting myself a set of these yet. Perhaps in the new year.

Always interesting to see the peeps that come to clone posts. You have the "Waaaa its a copy. ****** quality" etc peeps that probs have never actually taken a look inside an amp before or know what ohms law is and the open minded intrigued/curious people that can actually have a pros and cons conversation about it.

Cheers,

 

[ryan74701]

And for the money you have spend on those 2 amps that are just clones, you could have gotten a nice refurbished vintage amp or a new Class D amp with all bells and whistles.

I have two buckeye class D amps, 3-channel Hypex NCx500 Amplifier and a 4-channel Hypex NC502MP Amplifier.
Living room tv has a Yamaha n2000a, and in my shop I have two of the topping b200 monos, so I have some of the cleanest most neutral amps out there, I bought these clones for fun, duh.

 

[ryan74701]

It’s a small thing, but having to see “Musmy” and “pean” on the daily’s not for me. The mutilation of English is always good for a chortle, but not in these specific cases. YMMV.

I don’t sit close enough to see the word pean if it bothered me that much I’d just order new vu meters off AliExpress

 

[RexrothPigeon]

It’s a small thing, but having to see “Musmy” and “pean” on the daily’s not for me. The mutilation of English is always good for a chortle, but not in these specific cases. YMMV.

once again, de gustibus, I guess. For me, seeing "pean" on the device every day would be a cheery bit of fun

 

[mhardy6647]

I keep thinking “Mumsy” now. It’s “Musmy,” correct?
In the SU-X ballpark

It will always be "mumsy" to me... so... familial!

 

[Agapetos]

I have two buckeye class D amps, 3-channel Hypex NCx500 Amplifier and a 4-channel Hypex NC502MP Amplifier.
Living room tv has a Yamaha n2000a, and in my shop I have two of the topping b200 monos, so I have some of the cleanest most neutral amps out there, I bought these clones for fun, duh.

Im also considering getting this clone ...it has some of the looks I really love, and reminds me of my time with my late dad and the audio world we lived in. I find it gorgeous and will serve as a external fir my lesser serious 2 channel listening space. As you pointed out, to have some fun. Besides, if "all amplifiers sound the same" then its perfect for my needs. I have never purchased anything without a serious research of measurements, so I'm still debating....yeah, I could just get the purify class D from buckeye, but ... I'm leaning towards this one ATM. Thanks so much for sharing. Ket us know your impressions when you have tested it and pushed it a bit.