Metropoulos Amplification is a Burton, Michigan-based amp shop founded by George Metropoulos, who spent decades restoring and analyzing vintage 100-watt Marshall Superlead heads before turning that obsession into a small-batch building operation. The company built its reputation on plexi replica amplifiers, with George's approach centered on studying exceptional vintage examples and selecting premium components rather than producing strict part-for-part clones.

The core product line includes the Metro-Plex and Metro-Plex MK II, the Super-Plex, and the DVL-1, a 100-watt plexi-style amplifier developed in collaboration with William DuVall of Alice In Chains. Beyond complete heads, Metropoulos sells speaker cabinets, pedals, switchers, and a range of parts and accessories aimed at builders and restorers of plexi-style amps, including their Zero Loss FX Loop. A Metro-Plex preamp module is also offered through the Synergy Amps modular platform.

The brand is closely tied to vintage Marshall culture and has a long-running community forum at forum.metropoulos.net, which serves as a gathering point for plexi enthusiasts, builders, and Metropoulos owners discussing tone, mods, and restoration.

Metropoulos has 5 products cataloged on Equipboard, including Guitar Amplifier Heads and Guitar Amplifier Cabinets. Their gear is featured by 3 artists, with the strongest followings in Rock, Electronic, and Funk / Soul. Notable users include William DuVall, Brian Fallon, and Jesse Johnson.