H7PRO
amplifier
$100
Used market: $70*
Specifications
3 of 6 values have a recorded sourceExpert Audio Engineering Commentary
Headroom Notes
The figures recorded here are the ones for the 32 V / 5 A supply listed in the packing list - 78 / 71 / 65 W into 4 / 6 / 8 ohms. Douk publishes a full table of rated output against supply voltage, and at 48 V / 10 A the same amplifier is rated 250 / 210 / 185 W. Which of those you get is decided entirely by which brick you buy: this is a TPA3255 board, and the chip is never the limit.
Thermal Behavior
Balanced XLR and single-ended RCA inputs on a case 167 mm wide with no fan. Douk's table shows the 48 V / 10 A rating tripling the output, and the heat that goes with it has to leave through the same aluminium.
What the datasheet actually says
Quoted verbatim from the manufacturer’s own page, with the date we checked it. We state what is printed, not what anyone intended by it.
«Max output power: 300Wx2 (@4Ω) — Power Output Table of H7PRO: 32V/5A 4Ω 78W+78W; 48V/5A 4Ω 120W+120W; 48V/10A 4Ω 250W+250W»
The headline figure of 300 W per channel does not appear anywhere in the manufacturer's own power table: the highest tabulated value is 250 W per channel at 4 ohms, and that requires a 48 V / 10 A supply which is listed as optional. With the 32 V / 5 A adapter named in the packing list the same table gives 78 W per channel. The product title carries the 300 W number.
checked 8/5/2026* Estimated with the depreciation fallback (~70% retained value). · checked on 8/5/2026