Short answer
Both are desktop amplifiers, $200 against $176.
The Geshelli Archel Pro reaches 100 dB on 567 of the 567 models here, the Little Dot MK II on 560.
| Specification | Geshelli Archel Pro | Little Dot MK II |
|---|---|---|
| Power into 32Ω | 1.8 W | 100 mW |
| Power into 150Ω | 500 mW | 214 mW |
| Power into 300Ω | 250 mW | 300 mW |
| Power into 600Ω | 125 mW | 150 mW |
| Output impedance | 0.1 Ω unverified | not published |
| Output noise | 1.5 µV unverified | not published |
| Price | $200 | $176 |
| Headphones it reaches 100 dB on out of 567 | 567 | 560 |
Not published means the maker leaves it out, so that axis cannot be compared.
| Load | Geshelli Archel Pro | Little Dot MK II |
|---|---|---|
| 32 Ω | Unverified | Published |
| 150 Ω | Unverified | Derived |
| 300 Ω | Unverified | Published |
| 600 Ω | Unverified | Derived |
Geshelli Archel Pro publishes no electrical specification at all. That is true of 10 of the 280 sources here, and the figures in that column come from independent measurement rather than from a maker document — which is not worse, but it is not the same thing, and it cannot be checked against anything the maker will stand behind.
The Little Dot MK II column does stand on a power rating its maker printed, at one of these four loads at least. Reading the two straight across sets one kind of claim against another, and nobody has written down the conditions of both side by side.
7 headphones reach 100 dB on the Geshelli Archel Pro but not on the Little Dot MK II — Moondrop COSMO, Moondrop PARA, Moondrop PARA 2, 4 more.
560 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 HiFiMAN HE400se: Geshelli Archel Pro has +22 dB of headroom there against +10 dB. 13 dB is about 18 times the power, which matters for peaks rather than for how loud the music sits.
The hiss columns are empty for Geshelli Archel Pro and Little Dot MK II because neither maker publishes no output noise figure.
| Headphone | Impedance | Needs | Geshelli Archel Pro headroom | Little Dot MK II headroom | Geshelli Archel Pro hiss | Little Dot MK II hiss |
|---|---|---|---|---|---|---|
| Shure SE846 | 9 Ω | 0.04 mW | +41 dB | +28 dB | not published | not published |
| Campfire Audio Andromeda 2020 | 9 Ω | 4.0 mW | +21 dB | +8 dB | not published | not published |
| Audeze LCD-2 Classic | 70 Ω | 0.79 mW | +31 dB | +22 dB | not published | not published |
| Beyerdynamic DT 1990 Pro (250Ω) | 250 Ω | 0.63 mW | +27 dB | +26 dB | not published | not published |
| HiFiMAN HE400se | 25 Ω | 7.9 mW | +22 dB | +10 dB | not published | not published |
| Audio-Technica ATH-R70X | 470 Ω | 1.6 mW | +20 dB | +21 dB | not published | not published |
| Sennheiser HD 600 | 300 Ω | 6.6 mW | +16 dB | +17 dB | not published | not published |
| HiFiMAN Susvara | 60 Ω | 50 mW | +13 dB | +4 dB | not published | not published |
The Geshelli Archel Pro costs $24 more than the Little Dot MK II. Out of the 567 models here, that difference buys 7 more models 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 has a page of its own with a full headphone list and the provenance of every figure — worth opening here, because Geshelli Archel Pro has published no electrical specification at all and everything above comes from independent measurement: Geshelli Archel Pro and Little Dot MK II.