Both are desktop amplifiers, $176 against $160. This page puts them side by side on the only three things a maker can be held to — power, output impedance and noise — and then asks the question that actually matters: which headphones do they treat differently?
The SMSL HO100 reaches 100 dB on 567 of the 567 models here, the Little Dot MK II on 560.
| Specification | Little Dot MK II | SMSL HO100 |
|---|---|---|
| Power into 32Ω | 100 mW | 1.5 W |
| Power into 150Ω | 214 mW | 354 mW |
| Power into 300Ω | 300 mW | 200 mW |
| Power into 600Ω | 150 mW | 100 mW |
| Output impedance | not published | <0.1 Ω |
| Output noise | not published | 1.3 µV |
| Price | $176 | $160 |
| Headphones it reaches 100 dB on out of 567 | 560 | 567 |
A figure marked not published is missing from the maker’s own material, which is not the same as being good or bad. Where one of these two publishes a number and the other does not, the comparison on that axis cannot be made at all — and saying so is more useful than guessing.
| Load | Little Dot MK II | SMSL HO100 |
|---|---|---|
| 32 Ω | Published | Published |
| 150 Ω | Derived | Derived |
| 300 Ω | Published | Published |
| 600 Ω | Derived | Published |
Both makers publish a power rating, which is less common than the table above makes it look: of the 280 sources here, 209 publish a figure at at least one load and only 2 publish one at all four. Little Dot MK II publishes at 32 Ω and at 300 Ω; SMSL HO100 at 32 Ω, at 300 Ω and at 600 Ω. Every other row is worked out from those — between two published loads, or beyond them holding voltage constant, which understates rather than flatters.
So the two columns are not equally firm row by row: at 600 Ω only the SMSL HO100 figure is the maker’s own. On those rows the derived number is the one to doubt first.
What each of these labels means, and why a derived figure is still worth printing, is set out in how this data was built.
7 headphones reach 100 dB on the SMSL HO100 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. That is a power count and nothing more; whether either source suits a given headphone also depends on the two lines above.
The counts above say how many models the two treat differently. This says by how much. The same 8 headphones appear on every page of this kind, ordered from the easiest to drive to the hardest, so a row can be read across pages as well as across columns. Headroom is at a 100 dB SPL peak.
The widest gap on the list is the Shure SE846: SMSL HO100 has +46 dB of headroom there against +28 dB. 18 dB is about 60 times the power, which matters for peaks rather than for how loud the music sits.
The hiss columns are empty for Little Dot MK II because that maker publishes no output noise figure. That is a gap in the specification, not a quiet amplifier, and it is left blank here rather than filled with a plausible number.
| Headphone | Impedance | Needs | Little Dot MK II headroom | SMSL HO100 headroom | Little Dot MK II hiss | SMSL HO100 hiss |
|---|---|---|---|---|---|---|
| Shure SE846 | 9 Ω | 0.04 mW | +28 dB | +46 dB | not published | 17 dB |
| Campfire Audio Andromeda 2020 | 9 Ω | 4.0 mW | +8 dB | +26 dB | not published | -3 dB |
| Audeze LCD-2 Classic | 70 Ω | 0.79 mW | +22 dB | +30 dB | not published | -5 dB |
| Beyerdynamic DT 1990 Pro (250Ω) | 250 Ω | 0.63 mW | +26 dB | +26 dB | not published | -10 dB |
| HiFiMAN HE400se | 25 Ω | 7.9 mW | +10 dB | +24 dB | not published | -11 dB |
| Audio-Technica ATH-R70X | 470 Ω | 1.6 mW | +21 dB | +19 dB | not published | -16 dB |
| Sennheiser HD 600 | 300 Ω | 6.6 mW | +17 dB | +15 dB | not published | -21 dB |
| HiFiMAN Susvara | 60 Ω | 50 mW | +4 dB | +12 dB | not published | -23 dB |
The Little Dot MK II costs $16 more than the SMSL HO100, and on these three axes the money buys nothing: among the 567 models here there is not one that the Little Dot MK II handles and the SMSL HO100 does not — not on power, not on the one-eighth rule, not on hiss. The traffic runs the other way: the cheaper SMSL HO100 drives 7 models to 100 dB that the Little Dot MK II does not.
Everything in this paragraph counts only figures the two makers published. An advantage on an axis one of them leaves blank cannot be counted, and is not counted — how often that happens is its own page.
Each has a page of its own with every power figure traced to what the maker published and a full headphone list: Little Dot MK II and SMSL HO100. Or put either against your own headphones in the source comparison tool.