Yin Lu Mei S4 usb-c DAC/Amp

General Information

Limited

1. Brand new USB main control, supports firmware upgrade via USB.


2. Use AK4497EQ to decode.


3. Using ST's MCU processor and single-chip system, optimized for S4 code.


4. Using a fully balanced architecture, from the DAC to the LPF to the amp, including the volume adjustment are all balanced, which can be regarded as a player without system parts.


5. Adopt flagship volume control method, programmable analog volume chip-PGA4311UA, four-channel high-precision volume control, completely lossless.


6. The LPF uses 2 AD8620BRZ dual op amps, and a single one is close to 200 yuan per piece.


7. The amp uses 2 OPA1622 op amps, low distortion, and provides 145ma high current output.


8. The whole machine uses one-thousandth precision 25PPM resistors, 5~10% capacitors, ceramic capacitors are made of X7R material, tantalum capacitors are made of Rohm, Panasonic, etc.


9. PCB adopts Taiwan Nanya FR4 board, TG155 value (generally TG135 or lower), heavy gold, thick copper.


10. Provide 4 gains, 127 steps of volume adjustment, 8 kinds of filters.


11. Up to 6 groups of power processing, provide cleaner sound, no bottom noise, strong anti-interference.


12. Measurement size: 81X32X13mm, weight is about 50 grams.



13. Output level:
3.5mm Single-ended, 4.5VRMS at max volume step-127, 2VRMS at volume step-99

4.4mm Balanced, 9VRMS at max volume. 1KHZ sine wave.



14, THD+N, single port 0.0007%, balance port 0.0006% 1KHZ A weight, no load.



15. S/N ratio, single port -115DB, balanced port -120DB, 1KHZ, A weight, no load.



16. Output impedance, 2 ohms for single port, 1 ohm for balanced ports.



17. Power consumption, standby 5V 170ma current. Play state 5V 190~200ma, (50% volume, 32 ohm load on balance port)



The official shipment adopts CNC aluminum alloy shell. The picture below shows the 3D printing comparison of the size of the lighter.
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Latest reviews

Infoseeker

Headphoneus Supremus
Powerful dongle, nuetral-cold presentation.
Pros: Very powerful 9vrms!
Has a gain button to control volume.
Has a volume clocker rotating wheel with 127 steps.
Has a compensating presentation that doesn't have the typical veil/velvety sounds of the AKM mids. Though it still has the akm last octave sizzle...Very unique akm implementation.
Has decent imaging.
Cons: Will not compensate for harsh headsets.
Wow Yin lu Mei S4 really is crazy powerful. But it is really clinical-nuetral, unforgiving, cold in its presentation. But this is a positive thing, as this is compensating for AKM DAC's "velvet" transients.
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4 gain levels, 127 steps of volume adjustment, 8 kinds of filters.
Measure size: 81X32X13mm, about 50 grams.

Output Levels: w/127 volume steps:
Single-Ended:
4.5 VRMS at volume-127
2 VRMS at volume-99

Balance port:
9 VRMS at volume-127 (1KHZ sine wave)
4 VRMS at volume-99

THD + n,
SE port 0.0007%
BAL port 0.0006% 1KHZ weight, no load.

It really can drive the HD800S but it definitely is not a synergy match. I can EQ to compensate for its presentation on uapp. (or on apo for pc people) Presentation does well with brass instruments and other instrumental stuff or electronic music. Non-vocal stuff. This thing is really punishing me for owning an HD800S and is determined to use it with only genres like jazz. I own a E1DA PowerDac, the PowerDac is much more forgiving with the HD800S to have it work with more genres. The YinLuMei S4 does really well with nuetral/relatively darker stuff.

Tried this dongle with the Focal Utopia does a better than the HD800S.

EDIT: Also tried using this on a PC with HQPlayer & Roon. HD800S straight out of the dongle sounds great for videos. But using a Roon EQ & Crossfeed and HQPLAYER filtering the HD800S sounds perfectly compensated for music-listening. Really a competent desktop solution for dynamic headphones.

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This Yin Lu Mei S4 thing is powerful enough that I feel it could break headphones at max volume. Using a battery is not necessary, I only tested to see if the presentation would change with full power, but it didn't.



Device feels solid, build quality is great. Volume control works in steps, going up/down with a rotation click (not a potentiometer, as this turns endlessly). It also presses inwards to function as a button for the filter-switching.
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The small side button on its own is the gain switch.
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********
Using my Vision Ears VE8 via the 4.4BAL output there is no hiss. Having 127 steps of volume is nice; I just need about 49 for the VE8. Good volume control for sensitive iem. Presentation synnergy does well with this iem.

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Just the HD800S is a picky headphone as usual.

Remaining Miscellaneous Pictures
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