Short answer
Both are desktop amplifiers, $370 against $350.
The Geshelli Archel 3S Pro reaches 100 dB on 567 of the 567 models here, the Lake People G103-S Mk II on 566.
| Specification | Geshelli Archel 3S Pro | Lake People G103-S Mk II |
|---|---|---|
| Power into 32Ω | 1.0 W | 1.0 W |
| Power into 150Ω | 213 mW | 804 mW |
| Power into 300Ω | 107 mW | 580 mW |
| Power into 600Ω | 53 mW | 340 mW |
| Output impedance | not published | 0.1 Ω |
| Output noise | not published | 6.15 µV |
| Price | $370 | $350 |
| Headphones it reaches 100 dB on out of 567 | 567 | 566 |
Not published means the maker leaves it out, so that axis cannot be compared.
| Load | Geshelli Archel 3S Pro | Lake People G103-S Mk II |
|---|---|---|
| 32 Ω | Derived | Published |
| 150 Ω | Derived | Derived |
| 300 Ω | Derived | Published |
| 600 Ω | Derived | Published |
Only one of these two columns starts from a power rating. Lake People G103-S Mk II publishes one at 32 Ω, at 300 Ω and at 600 Ω; Geshelli Archel 3S Pro publishes none at any of these four loads, so its column is worked out from power it published at other loads. Both are arithmetic on a maker’s own figures rather than guesses, and the method used for the Geshelli Archel 3S Pro understates rather than flatters — but at 32 Ω, at 300 Ω and at 600 Ω are the only loads here at which its maker can be held to a figure.
1 headphone reaches 100 dB on the Geshelli Archel 3S Pro but not on the Lake People G103-S Mk II — Symphonium Titan.
566 of the 567 models here reach 100 dB on both.
Headroom is at a 100 dB SPL peak.
The widest gap on the list is the Audio-Technica ATH-R70X: Lake People G103-S Mk II has +24 dB of headroom there against +16 dB. 8 dB is about 6 times the power, which matters for peaks rather than for how loud the music sits.
The hiss columns are empty for Geshelli Archel 3S Pro because that maker publishes no output noise figure.
| Headphone | Impedance | Needs | Geshelli Archel 3S Pro headroom | Lake People G103-S Mk II headroom | Geshelli Archel 3S Pro hiss | Lake People G103-S Mk II hiss |
|---|---|---|---|---|---|---|
| Shure SE846 | 9 Ω | 0.04 mW | +45 dB | +38 dB | not published | 30 dB |
| Campfire Audio Andromeda 2020 | 9 Ω | 4.0 mW | +25 dB | +18 dB | not published | 10 dB |
| Audeze LCD-2 Classic | 70 Ω | 0.79 mW | +28 dB | +32 dB | not published | 8 dB |
| Beyerdynamic DT 1990 Pro (250Ω) | 250 Ω | 0.63 mW | +23 dB | +30 dB | not published | 4 dB |
| HiFiMAN HE400se | 25 Ω | 7.9 mW | +22 dB | +20 dB | not published | 3 dB |
| Audio-Technica ATH-R70X | 470 Ω | 1.6 mW | +16 dB | +24 dB | not published | -3 dB |
| Sennheiser HD 600 | 300 Ω | 6.6 mW | +12 dB | +19 dB | not published | -7 dB |
| HiFiMAN Susvara | 60 Ω | 50 mW | +10 dB | +14 dB | not published | -9 dB |
The Geshelli Archel 3S Pro costs $20 more than the Lake People G103-S Mk II. Out of the 567 models here, that difference buys 1 more model driven to 100 dB.
Nothing runs the other way: there is no axis here on which the cheaper of the two does better.
Only published figures count here; blank axes are counted separately.
Each in full: Geshelli Archel 3S Pro and Lake People G103-S Mk II.