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MAMORITAI Euphony HP Amp Review

Rate this headphone amplifier:

  • 1. Poor (headless panther)

    Votes: 30 18.6%
  • 2. Not terrible (postman panther)

    Votes: 98 60.9%
  • 3. Fine (happy panther

    Votes: 29 18.0%
  • 4. Great (golfing panther)

    Votes: 4 2.5%

  • Total voters
    161

amirm

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This is a review and detailed measurements of the MAMORITAI Euphony headphone amplifier. It was sent to me by the company and is on kickstarter with pricing from US $1,399.
MAMORITAI Euphony high-end headphone amp amplifier review.jpg

This is the high-end brand of Fosi Audio and one touch of the unit tells you that is precisely what they aimed at. The case is incredibly heavy and solid for a headphone amp, weighing more than many power amplifiers! Two quarter inch headphone jacks are wired in parallel. And analog volume control with excellent feel finishes what is in front. My shot above doesn't do justice to the nice looks like of the amp. Maybe the side view does a better job:
MAMORITAI Euphony high-end headphone amp amplifier back panel side view review.jpg

I suspect the case alone costs a couple hundred dollars!

Back panel shows simplicity itself:
MAMORITAI Euphony high-end headphone amp amplifier back panel review.jpg

Lack of balanced I/O is a miss as is gain switches. The latter exists if you open the unit with dual dip switches determining the gain. Wish that was brought out as it is both useful and impacts measurements. Speaking of which, it is very nice to see the company publishing half a dozen on their website. Try to find that on another high-end audio company!

From a quick glance of internal pictures, it seems that op-amps are used as input buffers but output stage is discreet transistors with beefy heatsinks.

MAMORITAI Euphony Measurements
I have modified my standard measurement settings for unbalanced input to produce 4 volts and not 2. That levels the playing field with balanced input headphone amps:
MAMORITAI Euphony high-end headphone amp amplifier measurement.png


Distortion is below threshold of hearing at -120 dB so noise is what sets SINAD to 104 dB. That is competent performance. Noise as eluded to, suffers at lower output levels:
MAMORITAI Euphony high-end headphone amp amplifier SNR measurement.png


So not a good bet for IEMs and such unless you use lower gain internally.

Frequency response is dead flat and very extended:
MAMORITAI Euphony high-end headphone amp amplifier frequency response measurement.png


As noted, noise floor is a bit high but otherwise, there is good bit of power to drive most headphones:
MAMORITAI Euphony high-end headphone amp amplifier Power 300 measurement.png


Power at 32 ohm is not as much as I anticipated:
MAMORITAI Euphony high-end headphone amp amplifier Power 32 measurement.png

I suspected that the output impedance is non-zero which turned out to be the case when I power tested at different impedances:
MAMORITAI Euphony high-end headphone amp amplifier Power vs impedance measurement.png


Those lines should all start at the same position if the output impedance is zero.

Channel matching is modest:
MAMORITAI Euphony high-end headphone amp amplifier Channel balance measurement.png


Again, that could have been helped with lower gain settings so you wouldn't have to rely on volume control range alone.

Sorry, did not have time to listen to it.

I ran the measurements and my critiques by the company. To my pleasant surprise, they still wanted the data to be published as to get feedback from membership!

Conclusions
Objective performance ranges from competent to "I wish this was better." Build quality however, is excellent all the way. As is transparency from the company which garners highest levels of appreciate and praise from me.

I can't recommend this version of MAMORITAI Audio Euphony. But if Fosi history is any example, I suspect follow up products with much improvements.

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As always, questions, comments, recommendations, etc. are welcome.

Any donations are much appreciated using: https://www.audiosciencereview.com/forum/index.php?threads/how-to-support-audio-science-review.8150/
 
I ran the measurements and my critiques by the company. To my pleasant surprise, they still wanted the data to be published as to get feedback from membership!
Good on them I suppose, there are measurements posted on their product page as well which is commendable. Thanks for the testing.

Pics;

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JSmith
 

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Here's the maximum Output power vs Load for the Euphony, based on Amir's measurements:
_b_Mamoritai Euphony___b_ Maximum Output Power per Channel vs Load (1).png

I've also tried my hand at predicting the Euphony's output impedance using Amir's data. Feedback is welcome!

Here's how I did it:
  1. Trace a part of the Load impedance sweep graph in an area of linear behavior. This should show purely the impact of output impedance induced voltage drop:
    Screenshot 2024-11-06 000948.png
  2. Do a trace fit and use the Predict function to estimate the output voltage under no load condition:
    Screenshot 2024-11-06 002604.png
  3. Use the Predict function again to see at what load impedance the predicted no load output voltage is halved. That's the point where Load impedance=Output impedance:
    Screenshot 2024-11-06 002027.png

---> 11Ω Output Impedance
 
Last edited:
Hi

Aside from the looks on which there will be some debate, this doesn't stand out. One can get better performances from a looooong lost of amplifers for less.
And it cost as much as the King of features and performances: The RME ADI..
Yep! A whiff...


Peace.
 
I like the fluted side panels.

Not a fan of the big logo, or the fact that it likely shows finger prints easily.

I'm only talking about the aesthetics since that seems to be the main point of this device.
 
Many thanks to Amir's great measurement and review! :D

Euphony is the first headphone amp/preamp crafted by our new MAMORITAI team, created over more than a year of meticulous work. We admit that in its development, we focused heavily on selecting high-quality components, circuit design, tuning, and aesthetics, with somewhat fewer features. Euphony offers an exceptional listening experience, and over the past six months, we’ve showcased it at international audio exhibitions, including High End Munich 2024, where it was honored to receive praise from many well-known reviewers for its sound and design.

We’ve now launched a Kickstarter campaign for Euphony, so if you’re interested, we’d be thrilled to have your support.
https://www.kickstarter.com/projects/mamoritaiaudio/mamoritai-euphony-headphone-amp-preamplifier

We also welcome honest feedback on Euphony from every member. We’ll collect your input as we prepare for the development of our next product. Thank you!:)
 
discreet transistors
They don't look very tactful or inconspicuous to me, and heaven knows whether they can keep a secret - they amplify everything, so I guess rather not. They are, however, without a doubt discrete. ;)

On a more serious note, this appears to be a "legit" IEC Class I device with all-unbalanced inputs - what happens what you connect it to a source that does not have galvanically isolated outputs like the AP, maybe a run-of-the-mill DAC on a (gasp!) ordinary PC? I mean, it's kind of predictable, but I'd like constructions like that to be exposed as the problematic nonsense they are. (This one's by no means alone, e.g. the Schiit Asgard is another that comes to mind.)
 
Couple questions: why two headphone jacks in parallel instead of balanced and unbalanced headphone out? Why are the different gain settings internal instead of an external switch? These are both common desired features that have measurable impact on performance.
 
Maybe I'm spoiled but this unit just doesn't seem all that impressive. Performance numbers are so-so, there's no xlr input, only 1/4 inch rca outputs, and the venerable THX AAA 789 outputs considerably more power at 32 ohms. Oh, and output impedance is an issue.

Also, I don't think it looks that good. That badge on the left side of the face plate looks like something a small Balkan country's military academy would pin on the collar of its cadets when they graduate flight school. And the volume knob looks like some kind of smiley face.

Fosi is simply going to have to up its game quite a bit before most audiophiles will be open to paying a premium price for one of their offerings. But I'm sure they will try again and do better next time. And eventually they will offer something fully equivalent to the super premium $10k headphone amps some other companies are selling, and at a much fairer price.
 
Fluted side panels look great. Logo, less so. An amp heavy enough that you can plug things in without it moving is kind of nice.
 
And the volume knob looks like some kind of smiley face.
It is not that way. All the black pixels are false (reflections of the room). The unit is pure chrome.
 
It is not that way. All the black pixels are false (reflections of the room). The unit is pure chrome.
Sorry, it just looked that way. That's the thing about chrome, it really doesn't photograph all that well.
 
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