Both are desktop amplifiers, $3499 against $2799. This page puts them side by side on the only three things a maker can be held to — power, output impedance and noise — and then asks the question that actually matters: which headphones do they treat differently?
On raw power they are level: each reaches 100 dB on 567 of the 567 non-electrostatic models here.
| Specification | Benchmark HPA4 | Burson Soloist 3X GT |
|---|---|---|
| Power into 32Ω | 3.4 W | 4.0 W |
| Power into 150Ω | 829 mW | 650 mW |
| Power into 300Ω | 440 mW | 320 mW |
| Power into 600Ω | 220 mW | 160 mW |
| Output impedance | <0.1 Ω | 0.5 Ω |
| Output noise | 2.45 µV | 1.5 µV unverified |
| Price | $3499 | $2799 |
| Headphones it reaches 100 dB on out of 567 | 567 | 567 |
A figure marked not published is missing from the maker’s own material, which is not the same as being good or bad. Where one of these two publishes a number and the other does not, the comparison on that axis cannot be made at all — and saying so is more useful than guessing.
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.
1 headphone is left alone by the Benchmark HPA4 under the one-eighth rule but coloured by the Burson Soloist 3X GT (Symphonium Titan).
567 of the 567 models here reach 100 dB on both. That is a power count and nothing more; whether either source suits a given headphone also depends on the two lines above.
Each has a page of its own with every power figure traced to what the maker published and a full headphone list: Benchmark HPA4 and Burson Soloist 3X GT. Or put either against your own headphones in the source comparison tool.