In single-supply versions of the A220 (the most common DIY variant), there is a large on the output. This blocks DC voltage from reaching your precious speakers.
The Creative A220 utilizes a fairly standard Class AB amplification design. Unlike modern D-class "digital" amps, the A220 relies on analog integrated circuits (ICs) that are easy to work with but generate a fair amount of heat. The Power Supply (PSU): Converts AC wall power to DC.