Crown is a professional grade amplifier used mostly in sound reinforcement. Crown is one of the Harman International brands and is highly respected in the pro audio world for making powerful and durable power amps and electronics.
Crown for years built amplifiers other companies re-badged as their own.
Notable Crown products include:
Crown Macro-Tech MA-12000i, which outputs 12,000 watts in bridged mode.
Crown CDi Series, which has up to 6,000 watts per channel.
For a company similar to Crown look at Mackie.