Reference / High-End ($$$$ )

• Audison (Italy) — Thesis, Voce series
• Arc Audio (USA) — XDi, SE series
• Helix (Germany) — V-Eight, SPXL series
• Mosconi (Italy) — Gladen, AS series
• Zapco (USA) — Z series, competition amps
• JL Audio (USA) — Slash v3, VX series