Short answer
Both are portable players, $3700 against $3899.
The Luxury & Precision P6 Pro reaches 100 dB on 566 of the 567 models here, the Astell&Kern SP3000 on 565.
| Specification | Astell&Kern SP3000 | Luxury & Precision P6 Pro |
|---|---|---|
| Power into 32Ω | 340 mW | 180 mW |
| Power into 150Ω | 73 mW | 39 mW |
| Power into 300Ω | 36 mW | 20 mW |
| Power into 600Ω | 18 mW | 10.0 mW |
| Output impedance | 0.7 Ω | 0.2 Ω |
| Output noise | 3 µV unverified | not published |
| Price | $3700 | $3899 |
| Headphones it reaches 100 dB on out of 567 | 565 | 566 |
Not published means the maker leaves it out, so that axis cannot be compared.
| Balanced | Astell&Kern SP3000 | Luxury & Precision P6 Pro |
|---|---|---|
| Socket | 4.4mm and 2.5mm | 4.4mm |
| Power into 32Ω | 1.2 W derived | 700 mW |
| Power into 300Ω | 132 mW derived | 80 mW |
| Output impedance | 1.6 Ω | 0.4 Ω |
| Output noise | not published | not published |
| Headphones it reaches 100 dB on out of 567 | 567 | 566 |
Through the balanced sockets the Astell&Kern SP3000 reaches 100 dB on 567 of the 567 models here and the Luxury & Precision P6 Pro on 566. Derived figures are worked out from the loads the maker did publish.
| Load | Astell&Kern SP3000 | Luxury & Precision P6 Pro |
|---|---|---|
| 32 Ω | Upper bound | Published |
| 150 Ω | Upper bound | Derived |
| 300 Ω | Upper bound | Published |
| 600 Ω | Upper bound | Derived |
These two columns are not the same kind of number, and that matters more than the gap between them. Luxury & Precision P6 Pro publishes a power rating (at 32 Ω and at 300 Ω); Astell&Kern SP3000 publishes no power figure at any load, only a maximum output voltage, so every milliwatt in its column is a ceiling worked out from that voltage.
A ceiling assumes the amplifier holds that voltage into the load, and nothing on Astell&Kern SP3000’s own sheet says it does. It is the most flattering reading available, and it is used here only because the alternative is a blank. Where the Astell&Kern SP3000 column looks the stronger of the two, treat the difference as unproven rather than measured. 24 of the 280 sources here are in that position, with no published power rating at any load.
1 headphone reaches 100 dB on the Luxury & Precision P6 Pro but not on the Astell&Kern SP3000 — Moondrop PARA.
4 headphones are left alone by the Luxury & Precision P6 Pro under the one-eighth rule but coloured by the Astell&Kern SP3000 (Campfire Audio Chimera, Moondrop Armature Art 12, Softears Volume, 1 more).
565 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 Shure SE846: Luxury & Precision P6 Pro has +37 dB of headroom there against +34 dB. 3 dB is about 1.9 times the power, which matters for peaks rather than for how loud the music sits.
The hiss columns are empty for Astell&Kern SP3000 and Luxury & Precision P6 Pro because neither maker publishes no output noise figure.
| Headphone | Impedance | Needs | Astell&Kern SP3000 headroom | Luxury & Precision P6 Pro headroom | Astell&Kern SP3000 hiss | Luxury & Precision P6 Pro hiss |
|---|---|---|---|---|---|---|
| Shure SE846 | 9 Ω | 0.04 mW | +34 dB | +37 dB | not published | not published |
| Campfire Audio Andromeda 2020 | 9 Ω | 4.0 mW | +14 dB | +17 dB | not published | not published |
| Audeze LCD-2 Classic | 70 Ω | 0.79 mW | +23 dB | +20 dB | not published | not published |
| Beyerdynamic DT 1990 Pro (250Ω) | 250 Ω | 0.63 mW | +18 dB | +16 dB | not published | not published |
| HiFiMAN HE400se | 25 Ω | 7.9 mW | +15 dB | +14 dB | not published | not published |
| Audio-Technica ATH-R70X | 470 Ω | 1.6 mW | +12 dB | +9 dB | not published | not published |
| Sennheiser HD 600 | 300 Ω | 6.6 mW | +7 dB | +5 dB | not published | not published |
| HiFiMAN Susvara | 60 Ω | 50 mW | +6 dB | +3 dB | not published | not published |
The Luxury & Precision P6 Pro costs $199 more than the Astell&Kern SP3000. Out of the 567 models here, that difference buys 1 more model driven to 100 dB and 4 more models left alone under the one-eighth rule.
Nothing runs the other way: there is no axis here on which the cheaper of the two does better.
Only published figures count here; blank axes are counted separately.
Each in full: Astell&Kern SP3000 and Luxury & Precision P6 Pro.