Short answer
Both are desktop amplifiers, $3798 against $3600.
On raw power they are level: each reaches 100 dB on 567 of the 567 non-electrostatic models here.
| Specification | Holo Audio Bliss KTE | Violectric V550 Pro |
|---|---|---|
| Power into 32Ω | 3.0 W | 4.7 W |
| Power into 150Ω | 600 mW | 2.9 W |
| Power into 300Ω | 300 mW | 1.4 W |
| Power into 600Ω | 150 mW | 740 mW |
| Output impedance | 1.0 Ω | 0.15 Ω |
| Output noise | not published | 5.48 µV |
| Price | $3798 | $3600 |
| Headphones it reaches 100 dB on out of 567 | 567 | 567 |
Not published means the maker leaves it out, so that axis cannot be compared.
| Balanced | Holo Audio Bliss KTE | Violectric V550 Pro |
|---|---|---|
| Socket | 4-pin XLR | balanced |
| Power into 32Ω | 12.0 W | 4.7 W |
| Power into 300Ω | 1.2 W derived | 1.4 W |
| Output impedance | <0.1 Ω | 0.3 Ω |
| Output noise | not published | 5.48 µV |
| Headphones it reaches 100 dB on out of 567 | 567 | 567 |
Through the balanced sockets the two are level on the same test: each reaches 100 dB on 567 of the 567 models here. Derived figures are worked out from the loads the maker did publish.
| Load | Holo Audio Bliss KTE | Violectric V550 Pro |
|---|---|---|
| 32 Ω | Published | Published |
| 150 Ω | Published | Derived |
| 300 Ω | Derived | Published |
| 600 Ω | Derived | Published |
Both makers publish a power rating. Holo Audio Bliss KTE publishes at 32 Ω and at 150 Ω; Violectric V550 Pro at 32 Ω, at 300 Ω and at 600 Ω. The other rows are worked out from those.
So the two columns are not equally firm row by row: at 150 Ω only the Holo Audio Bliss KTE figure is the maker’s own and at 300 Ω and at 600 Ω only the Violectric V550 Pro figure is the maker’s own. On those rows the derived number is the one to doubt first.
On power they are interchangeable across this whole database: there is no headphone here that one reaches 100 dB on and the other does not.
15 headphones are left alone by the Violectric V550 Pro under the one-eighth rule but coloured by the Holo Audio Bliss KTE (64 Audio Nio, 64 Audio Volur, Campfire Audio Andromeda 2023, 12 more).
567 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: Violectric V550 Pro has +28 dB of headroom there against +21 dB. 7 dB is about 4.9 times the power, which matters for peaks rather than for how loud the music sits.
The hiss columns are empty for Holo Audio Bliss KTE because that maker publishes no output noise figure.
| Headphone | Impedance | Needs | Holo Audio Bliss KTE headroom | Violectric V550 Pro headroom | Holo Audio Bliss KTE hiss | Violectric V550 Pro hiss |
|---|---|---|---|---|---|---|
| Shure SE846 | 9 Ω | 0.04 mW | +43 dB | +45 dB | not published | 29 dB |
| Campfire Audio Andromeda 2020 | 9 Ω | 4.0 mW | +23 dB | +25 dB | not published | 9 dB |
| Audeze LCD-2 Classic | 70 Ω | 0.79 mW | +32 dB | +38 dB | not published | 7 dB |
| Beyerdynamic DT 1990 Pro (250Ω) | 250 Ω | 0.63 mW | +28 dB | +34 dB | not published | 3 dB |
| HiFiMAN HE400se | 25 Ω | 7.9 mW | +25 dB | +26 dB | not published | 2 dB |
| Audio-Technica ATH-R70X | 470 Ω | 1.6 mW | +21 dB | +28 dB | not published | -4 dB |
| Sennheiser HD 600 | 300 Ω | 6.6 mW | +17 dB | +23 dB | not published | -8 dB |
| HiFiMAN Susvara | 60 Ω | 50 mW | +15 dB | +21 dB | not published | -10 dB |
The Holo Audio Bliss KTE costs $198 more than the Violectric V550 Pro, and on these three axes the money buys nothing: among the 567 models here there is not one that the Holo Audio Bliss KTE handles and the Violectric V550 Pro does not — not on power, not on the one-eighth rule, not on hiss. The traffic runs the other way: the cheaper Violectric V550 Pro leaves 15 models alone under the one-eighth rule that the Holo Audio Bliss KTE does not.
Only published figures count here; blank axes are counted separately.
Each in full: Holo Audio Bliss KTE and Violectric V550 Pro.