On power, yes — all of them. Every one of the 69 desktop amplifiers in this database reaches 100 dB SPL on the HiFiMAN HE400se, which needs 7.9 mW at its 25Ω.
Power is one of three questions and the one that goes wrong least often. The other two — whether the source’s output impedance leaves the frequency response alone, and whether you will hear its noise floor — are answered further down, separately, because a source can pass one and fail another.
The cheapest one that does reach it is the JDS Labs Atom+ (2nd gen) at $99, which delivers 781 mW into 25Ω — 20 dB of headroom over the 7.9 mW this headphone needs for 100 dB SPL.
100 dB SPL is a peak level, not a listening level. If you listen at 85 dB the same headphone needs 0.25 mW, which is 15 dB less, and the answer above changes for most of the category. The model page has the full ladder.
Under the one-eighth rule the HiFiMAN HE400se wants a source below 3.12Ω. Of the 49 desktop amplifiers here that publish an output impedance, 45 are under it and 4 are not.
The furthest over is the Bottlehead Crack (OTL kit) at 120Ω, which is 38× the ceiling. Above that threshold the source stops being a volume control and starts being part of the frequency response. The simulator shows what that looks like.
The other 20 publish nothing at all on this, so they are not on either side of that count. This site leaves them blank rather than assuming a figure.
Hiss depends on the source’s own noise floor and on how sensitive the headphone is. At 91.0 dB and 25Ω, the HiFiMAN HE400se turns one microvolt of source noise into about -13 dB SPL — and the threshold where that stops being noticeable in a quiet room is around 20 dB SPL.
Of the 28 desktop amplifiers here that publish a noise figure, 28 stay below that threshold with this headphone and 0 cross it.
The remaining 41 publish no noise figure, so they cannot be placed on either side.
| Source | Price | Into 25 Ω | Headroom | Output impedance | Hiss in these |
|---|---|---|---|---|---|
| JDS Labs Atom+ (2nd gen) | $99 | 781 mW | 19.9 dB | 0.7 Ω | -7 dB SPL |
| Schiit Magni Unity | $119 | 2.6 W | 25.1 dB | 0.1 Ω | -9 dB SPL |
| JDS Labs Atom Amp 2 | $129 | 2.1 W | 24.2 dB | 0.7 Ω | -11 dB SPL |
27 of the 69 desktop amplifiers here publish all three figures. 26 of those clear all three for the HiFiMAN HE400se, and the cheapest is the JDS Labs Atom+ (2nd gen) at $99.
It delivers 781 mW into 25 Ω where this headphone needs 7.9 mW for 100 dB — 19.9 dB of headroom — its output impedance of 0.7 Ω sits under the one-eighth ceiling of 3.12 Ω, and its 1.99 µV of noise leaves the hiss 27 dB under the 20 dB SPL threshold this site uses.
Cheapest that satisfies three published numbers is not the same as best, and the sources left out of this count are left out for want of a published figure, not for failing one. How often that happens is its own page.
| Source | Price | Into 25Ω | Output impedance | Hiss in these | Power verdict |
|---|---|---|---|---|---|
| JDS Labs Atom+ (2nd gen) | $99 | 781 mW | 0.7 Ω | -7 dB SPL | Comfortable |
| Schiit Magni Heresy | $99 | 2.5 W | 0.25 Ω | not published | Comfortable |
| Fosi Audio SK02 | $100 | 148 mW | not published | -2 dB SPL | Comfortable |
| Schiit Magni+ | $109 | 1.6 W | not published | not published | Comfortable |
| Schiit Magni Unity | $119 | 2.6 W | 0.1 Ω | -9 dB SPL | Comfortable |
| JDS Labs Atom Amp 2 | $129 | 2.1 W | 0.7 Ω | -11 dB SPL | Comfortable |
| Schiit Vali 2+ | $149 | 1.2 W | 1.8 Ω | not published | Comfortable |
| Schiit Vali 3 | $149 | 1.2 W | 0.5 Ω | -4 dB SPL | Comfortable |
| Topping L30 II | $149 | 2.9 W | 0.1 Ω | -23 dB SPL | Comfortable |
| SMSL HO100 | $160 | 1.9 W | <0.1 Ω | -11 dB SPL | Comfortable |
| xDuoo MT-604 | $169 | 1.6 W | not published | not published | Comfortable |
| iFi Zen CAN | $199 | 1.3 W | not published | not published | Comfortable |
Sorted by how many of the three questions the source answers well, then by price. A blank in a column is a blank in the manufacturer’s own documentation, not a zero.
The HiFiMAN HE400se on other categories: portable players · desktop DAC/amps · audio interfaces.
The HiFiMAN HE400se page has every source in the database against this headphone, and the matcher takes your own numbers.