Chameleon Amplifier

The Chameleon Amplifier was a groundbreaking power amplifier introduced in 1990 by Malcolm Hill.

Renowned for its high power density and compact design, the Chameleon challenged the industry's top performers.  

Key Features

• Power output: 1000W RMS per channel into 4 ohms
• Frequency response: 10 Hz to 20 kHz ±0.5 dB
• Total harmonic distortion: <0.01% at 1 kHz at full power
• Signal-to-noise ratio: >110 dB unweighted (20 Hz to 20 kHz)
• Slew rate: >60 V/μs

Unique Design Elements

• Dual-mode operation: Can function as either a voltage source or current source amplifier
• Adaptive slew limiting: Prevents transient intermodulation distortion
• Soft clipping: Gradually reduces gain to prevent harsh distortion
• Dynamic bias control: Optimizes efficiency based on signal level

Advanced Circuitry

• Output stage: Uses a complementary bipolar transistor design with multiple parallel devices for high current capability
• Protection systems: Includes DC offset, thermal, short circuit, and clip limiting
• Input stage: Fully balanced differential amplifier for noise immunity
• Signal processing: Features subsonic filter and optional high-frequency rolloff

Construction and Serviceability

• Modular design: Allows for easy servicing
• Forced-air cooling: Ensures efficient heat dissipation
• Toroidal power transformer: Reduces electromagnetic interference
• Balanced and unbalanced inputs: Offers flexibility for various audio sources

The Chameleon amplifier's innovative design and advanced features made it a standout product in the professional audio market. Its ability to deliver high power and exceptional audio quality in a compact form factor solidified its reputation as a benchmark for power amplifiers.

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