Short answer
Both are dongles, $299 against $210.
The EarMen Colibri reaches 100 dB on 563 of the 567 models here, the EPZ TP50 on 561.
| Specification | EarMen Colibri | EPZ TP50 |
|---|---|---|
| Power into 32Ω | 75 mW | 121 mW |
| Power into 150Ω | 16 mW | 26 mW |
| Power into 300Ω | 8.0 mW | 13 mW |
| Power into 600Ω | 4.0 mW | 6.5 mW |
| Output impedance | not published | not published |
| Output noise | not published | 1.0 µV |
| Price | $299 | $210 |
| Headphones it reaches 100 dB on out of 567 | 563 | 561 |
Not published means the maker leaves it out, so that axis cannot be compared.
| Balanced | EarMen Colibri | EPZ TP50 |
|---|---|---|
| Socket | 4.4mm | 4.4mm |
| Power into 32Ω | 280 mW | 240 mW |
| Power into 300Ω | 30 mW derived | 26 mW derived |
| Output impedance | not published | not published |
| Output noise | not published | 1.0 µV |
| Headphones it reaches 100 dB on out of 567 | 565 | 565 |
Through the balanced sockets the two are level on the same test: each reaches 100 dB on 565 of the 567 models here. Derived figures are worked out from the loads the maker did publish.
| Load | EarMen Colibri | EPZ TP50 |
|---|---|---|
| 32 Ω | Published | Published |
| 150 Ω | Derived | Derived |
| 300 Ω | Derived | Derived |
| 600 Ω | Derived | Derived |
Both makers publish a power rating. EarMen Colibri publishes at 32 Ω; EPZ TP50 at 32 Ω. The other rows are worked out from those.
The two publish at the same loads, which is the one case where the rows of this table can be read straight across.
4 headphones reach 100 dB on the EarMen Colibri but not on the EPZ TP50 — Moondrop COSMO, Symphonium Crimson, Symphonium Helios, 1 more.
2 headphones reach 100 dB on the EPZ TP50 but not on the EarMen Colibri — HiFiMAN Susvara, Moondrop SKYLAND.
559 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 Campfire Audio Andromeda 2020: EarMen Colibri has +13 dB of headroom there against +9 dB. 4 dB is about 2.5 times the power, which matters for peaks rather than for how loud the music sits.
The hiss columns are empty for EarMen Colibri because that maker publishes no output noise figure.
| Headphone | Impedance | Needs | EarMen Colibri headroom | EPZ TP50 headroom | EarMen Colibri hiss | EPZ TP50 hiss |
|---|---|---|---|---|---|---|
| Shure SE846 | 9 Ω | 0.04 mW | +33 dB | +29 dB | not published | 14 dB |
| Campfire Audio Andromeda 2020 | 9 Ω | 4.0 mW | +13 dB | +9 dB | not published | -6 dB |
| Audeze LCD-2 Classic | 70 Ω | 0.79 mW | +16 dB | +18 dB | not published | -7 dB |
| Beyerdynamic DT 1990 Pro (250Ω) | 250 Ω | 0.63 mW | +12 dB | +14 dB | not published | -12 dB |
| HiFiMAN HE400se | 25 Ω | 7.9 mW | +11 dB | +11 dB | not published | -13 dB |
| Audio-Technica ATH-R70X | 470 Ω | 1.6 mW | +5 dB | +7 dB | not published | -19 dB |
| Sennheiser HD 600 | 300 Ω | 6.6 mW | +1 dB | +3 dB | not published | -23 dB |
| HiFiMAN Susvara | 60 Ω | 50 mW | -1 dB | +1 dB | not published | -25 dB |
The EarMen Colibri costs $89 more than the EPZ TP50. Out of the 567 models here, that difference buys 4 more models driven to 100 dB.
It does not run one way only: the cheaper EPZ TP50 drives 2 models to 100 dB that the EarMen Colibri does not, which is the part worth checking against your own headphones before paying the difference.
Only published figures count here; blank axes are counted separately.
Each in full: EarMen Colibri and EPZ TP50.