Short answer
Both are desktop amplifiers, $3798 against $3200.
The Holo Audio Bliss KTE reaches 100 dB on 567 of the 567 models here, the SPL Phonitor x on 566.
| Specification | Holo Audio Bliss KTE | SPL Phonitor x |
|---|---|---|
| Power into 32Ω | 3.0 W | 1.0 W |
| Power into 150Ω | 600 mW | 3.1 W |
| Power into 300Ω | 300 mW | 4.2 W |
| Power into 600Ω | 150 mW | 2.1 W |
| Output impedance | 1.0 Ω | 0.18 Ω |
| Output noise | not published | 5.48 µV |
| Price | $3798 | $3200 |
| Headphones it reaches 100 dB on out of 567 | 567 | 566 |
Not published means the maker leaves it out, so that axis cannot be compared.
| Balanced | Holo Audio Bliss KTE | SPL Phonitor x |
|---|---|---|
| Socket | 4-pin XLR | balanced |
| Power into 32Ω | 12.0 W | 700 mW |
| Power into 300Ω | 1.2 W derived | 2.9 W derived |
| Output impedance | <0.1 Ω | 0.36 Ω |
| Output noise | not published | 9.75 µV |
| Headphones it reaches 100 dB on out of 567 | 567 | 566 |
Through the balanced sockets the Holo Audio Bliss KTE reaches 100 dB on 567 of the 567 models here and the SPL Phonitor x on 566. Derived figures are worked out from the loads the maker did publish.
| Load | Holo Audio Bliss KTE | SPL Phonitor x |
|---|---|---|
| 32 Ω | Published | Published |
| 150 Ω | Published | Derived |
| 300 Ω | Derived | Derived |
| 600 Ω | Derived | Derived |
Both makers publish a power rating. Holo Audio Bliss KTE publishes at 32 Ω and at 150 Ω; SPL Phonitor x at 32 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. On those rows the derived number is the one to doubt first.
1 headphone reaches 100 dB on the Holo Audio Bliss KTE but not on the SPL Phonitor x — Symphonium Titan.
15 headphones are left alone by the SPL Phonitor x 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).
566 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 Sennheiser HD 600: SPL Phonitor x has +28 dB of headroom there against +17 dB. 11 dB is about 14 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 | SPL Phonitor x headroom | Holo Audio Bliss KTE hiss | SPL Phonitor x hiss |
|---|---|---|---|---|---|---|
| Shure SE846 | 9 Ω | 0.04 mW | +43 dB | +38 dB | not published | 29 dB |
| Campfire Audio Andromeda 2020 | 9 Ω | 4.0 mW | +23 dB | +18 dB | not published | 9 dB |
| Audeze LCD-2 Classic | 70 Ω | 0.79 mW | +32 dB | +33 dB | not published | 7 dB |
| Beyerdynamic DT 1990 Pro (250Ω) | 250 Ω | 0.63 mW | +28 dB | +39 dB | not published | 3 dB |
| HiFiMAN HE400se | 25 Ω | 7.9 mW | +25 dB | +20 dB | not published | 2 dB |
| Audio-Technica ATH-R70X | 470 Ω | 1.6 mW | +21 dB | +32 dB | not published | -4 dB |
| Sennheiser HD 600 | 300 Ω | 6.6 mW | +17 dB | +28 dB | not published | -8 dB |
| HiFiMAN Susvara | 60 Ω | 50 mW | +15 dB | +15 dB | not published | -10 dB |
The Holo Audio Bliss KTE costs $598 more than the SPL Phonitor x. Out of the 567 models here, that difference buys 1 more model driven to 100 dB.
It does not run one way only: the cheaper SPL Phonitor x leaves 15 models alone under the one-eighth rule that the Holo Audio Bliss KTE 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: Holo Audio Bliss KTE and SPL Phonitor x.