Part three · the amplifier
A portable build is a voltage problem before it is a power problem. The board you can use is the board whose input window contains your pack's nominal voltage — with margin.
| Board | Channels | Power | Supply | Min load | Links |
|---|---|---|---|---|---|
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0 boards. Power is the manufacturer's headline figure and the voltage it was taken at; the simulator derates it for a lower pack voltage.
Below the minimum, the board either refuses to start or starts and collapses on transients. A 24 V pack has 25.2 V hot off the charger and sags under load; a board rated 24 V minimum will cut out on kick drums.
Above the maximum you are one charger cycle from dead capacitors. A fully charged "48 V" 13S pack is 54.6 V. Boards rated to 48 V are not 13S boards unless the listing says so explicitly.
A 2.1 board carries two satellite channels and a bridged sub channel, usually with a fixed or potentiometer crossover around 80–150 Hz. The sub channel needs the most current and is the first thing to clip when the pack sags. Budget the pack's continuous discharge at the board's full-rated draw and then add 20%.