Power supply ±28V for the GML 8200 and 8300 series units and can power two units in any combination. Also used for the 9500 (2 units required).

When power supplies are built into the same chassis as the audio circuitry, power transformers can radiate nasty magnetic fields into nearby audio paths increasing noise while additional heat generation brought on by transformers, rectifiers, and regulators can contribute to unwanted drift of operational parameters and premature failure of componentry. To avoid these problems, all GML outboard processors use stringently regulated and pure filtered external power supplies. All GML power supplies come with their dedicated detachable connecting cables as well as a country-specific detachable IEC mains power cord. Both the 8355 and the 9015 are internally switchable between 110v and 220v mains voltages making them flexible for engineers traveling overseas. Notably, these GML Power Supplies have an exceptionally wide input voltage tolerance (±30%) for reliable operation under questionable power conditions.