The Atoll HQA (High Quality Amplifier) is a high-performance stereo integrated amplifier delivering 2 x 80 Watts of power, capable of driving a wide array of demanding loudspeakers. Engineered with an ultra-wide frequency bandwidth (1Hz to 300kHz) and a compact, mechanically rigid chassis, the HQA provides a pure, transparent soundstage free from micro-dynamics veiling or electronic distortion.

Inside, the amplifier features high-current 16A audio MOSFET power transistors, a massive 300VA low-noise toroidal transformer, and a generous 44,000 µF Vishay capacitive filter array. Built for long-term reliability and ease of serviceability, the chassis incorporates a 6mm PMMA non-conductive rear panel to eliminate electrical crosstalk, machined Delrin decoupling feet, and a clean PCB layout designed to be easily serviced for decades to come.

KEY FEATURES & SYSTEM HIGHLIGHTS

• High-Current MOSFET Output Stage: Equipped with special audio-grade MOSFET transistors rated at 16A capacity to deliver dynamic, effortless power into low-impedance speaker loads.
• Ultra-Wideband Transparency: Extremely wide frequency bandwidth (1Hz to 300kHz) preserves low-level reverberation details, micro-transients, and precise spatial soundstaging.
• Robust Linear Power Supply: Features a low-noise 300VA toroidal transformer, dedicated driver-stage shunt regulation, and 44,000 µF of 105°C Vishay filtering capacitors.
• Resonance & Electrical Isolation: Built on a mechanically welded chassis with a 6mm non-conductive PMMA rear panel and 3 machined Delrin feet to eliminate micro-vibrations and connector crosstalk.
• Loudspeaker & Circuit Protection: Includes integrated short-circuit and thermal overload protection to safeguard both the amplifier and connected speakers.
• Designed for Decades of Serviceability: Features solid aluminum control knobs and a clean, widely spaced printed circuit board layout to ensure straightforward maintenance and repairability.

SPECIFICATIONS