Hegel H20 Stereo Power Amplifier at Vinyl Sound Buffalo, NY USA

The Hegel H20 is a stereo power amplifier from Hegel Music Systems (Oslo, Norway), available at Vinyl Sound in Buffalo, NY, USA. Based on the circuit architecture of Hegel's H30 reference amplifier, the H20 delivers 200 watts per channel into 8 ohms in a dual-mono Class AB configuration, with a damping factor exceeding 1,000 and a 1,000 VA dual-mono power supply supported by 90,000 µF of capacitance. Its output stage employs 20 bipolar transistors rated at 15 A and 200 W each, enabling a peak current delivery capability exceeding 130 amperes. The H20 incorporates Hegel's patented laser-trimmed SoundEngine modules and the latest version of Hegel's FET input technology, which eliminates higher-order harmonic echoes in the high frequencies for greater detail and a more natural high-frequency presentation. The chassis is finished in bead-blasted and anodized aluminum on the front, top, and side panels, with a single front-panel button and two pairs of heavy-duty gold-plated speaker binding posts at the rear.

H30 Reference Circuit Architecture and FET Input Technology

The H20's design is derived directly from Hegel's H30 reference power amplifier, adapted into a more compact dual-mono stereo format with a 1,000 VA power supply. The input stage uses Hegel's latest FET technology, which benefits from the same principle of field-effect transistor linearization that governs the H30 and H30A: FETs in this circuit configuration are better at reproducing low-level bass-line detail with rhythmic accuracy, and they suppress the higher-order harmonic distortion in the upper frequencies that can make high-powered solid-state amplifiers sound harsh or artificially bright. The output stage's 20 bipolar transistors are specified for 15 A and 200 W each, delivering an aggregate current reserve of more than 130 amperes that translates into a damping factor exceeding 1,000 and the ability to handle low-impedance and difficult loudspeaker loads with a stable, controlled presentation.

SoundEngine Technology and Dual-Mono Power Supply

Hegel's patented SoundEngine modules in the H20 are laser-trimmed during manufacturing to achieve the precise matching required for effective feed-forward distortion correction. SoundEngine monitors the amplified signal for corruption and cancels distortion components in real time, achieving THD below 0.006% at 100 W into 8 ohms. The 1,000 VA dual-mono power supply provides each channel with its own independent transformer winding and 45,000 µF of capacitance, ensuring that dynamic transient demand on one channel does not compromise the current available to the other. The H20's frequency and phase responses are tightly controlled over the full audio band, with less than ±0.2 dB deviation from 20 Hz to 20 kHz and less than 2 degrees of phase deviation in the same range, confirming that the amplifier introduces no measurable amplitude or timing distortion within the audio band.

Key Features

• 200 W per Channel into 8 Ohms, Dual-Mono: H30 reference circuit architecture adapted into a stereo format, with a 1,000 VA dual-mono power supply and 90,000 µF capacitor bank for sustained dynamic headroom.
• Patented SoundEngine with Laser-Trimmed Modules: Hegel's feed-forward distortion correction circuit, trimmed during manufacturing for maximum effectiveness, reduces THD to below 0.006% at 100 W into 8 ohms.
• Hegel FET Input Technology: The latest iteration of Hegel's field-effect transistor input stage, improved for greater rhythmic bass accuracy and reduced higher-order harmonic distortion in the high frequencies.
• 20-Transistor Output Stage with 130 A Peak Current: Twenty 15 A / 200 W bipolar transistors deliver more than 130 amperes of peak current, resulting in a damping factor greater than 1,000 and stable drive capability for any loudspeaker.
• Damping Factor Greater Than 1,000: Very high damping factor provides precise loudspeaker driver control, tight bass reproduction, and resilience against back-EMF from the drivers.
• Balanced XLR and Unbalanced RCA Inputs: Accepts balanced and single-ended signal sources from any preamplifier or integrated amplifier with variable output, with a 10 kohm balanced input impedance and 50 kohm unbalanced impedance.
• Two Pairs of Gold-Plated Speaker Binding Posts: Heavy-duty posts accommodate biwire and biamp configurations, with gold plating ensuring long-term low-resistance connections.
• Less Than ±0.2 dB Amplitude Deviation (20 Hz - 20 kHz): Flat frequency response within ±0.2 dB across the full audio band confirms the amplifier introduces no coloration through amplitude variation.
• Bead-Blasted and Anodized Aluminum Chassis: The front, top, and side panels are finished in bead-blasted anodized aluminum for an exclusive appearance and improved surface durability.

Technical Specifications

Frequently Asked Questions

What is the Hegel H20?

The Hegel H20 is a stereo power amplifier from Hegel Music Systems (Oslo, Norway), delivering 200 W per channel into 8 ohms in a dual-mono Class AB design. Its circuit architecture is derived from Hegel's H30 reference amplifier and incorporates the latest version of Hegel's FET input technology alongside laser-trimmed SoundEngine feed-forward distortion correction modules. A 1,000 VA dual-mono power supply and a 20-transistor output stage capable of more than 130 A peak current enable the H20 to drive demanding loudspeakers with a damping factor exceeding 1,000.

How does the Hegel H20 compare to the Parasound A21+?

The Parasound A21+ is an American stereo power amplifier rated at 300 W per channel into 8 ohms, designed by John Curl and featuring a high Class A bias output stage (25 W Class A before transitioning to Class AB), complementary bipolar/JFET circuitry, and a separate 12 V trigger output. The H20 delivers lower rated power (200 W vs. 300 W) but achieves a higher specified damping factor (more than 1,000 vs. approximately 800 for the A21+) through SoundEngine distortion correction, and its FET input stage is optimized specifically for rhythmic bass accuracy and high-frequency purity. The A21+ offers a larger power supply and the tonal character associated with its Class A biased output stage, while the H20 provides Hegel's characteristic neutral transparency derived from its H30 reference circuit lineage.

How does the Hegel H20 compare to the Cambridge Audio Edge W?

The Cambridge Audio Edge W is a British stereo power amplifier rated at 200 W per channel into 8 ohms, using a balanced Class XD topology developed by Cambridge and featuring a sophisticated power supply with a custom-wound toroidal transformer. Both amplifiers share a 200 W rating into 8 ohms. The H20 specifies a higher damping factor (more than 1,000 vs. approximately 500 for the Edge W) and uses Hegel's SoundEngine feed-forward correction rather than Cambridge's XD topology, which applies a displacement circuit to shift the Class AB crossover point. The Edge W offers a single pair of speaker terminals vs. the H20's two pairs, making the Hegel more convenient for biwire or biamp applications.

What is the difference between SoundEngine and SoundEngine2?

SoundEngine is Hegel's original patented feed-forward distortion correction circuit, used in the H20, P30A, H30A, and Viking. SoundEngine2 is the second-generation version, used in the H600, H400, and C5-series amplifiers. Both operate on the same feed-forward principle, predicting and canceling distortions in real time without relying on conventional negative feedback. SoundEngine2 extends the correction circuit's operating bandwidth and efficiency relative to the first generation, and also enables lower Class AB bias current, which reduces idle heat output. In the H20, SoundEngine modules are additionally laser-trimmed during manufacturing to ensure each unit's correction circuit is operating at optimal precision from the factory.

Can the Hegel H20 drive planar-magnetic or electrostatic loudspeakers?

Yes. The H20's combination of 200 W per channel, a peak current delivery exceeding 130 A, and a damping factor greater than 1,000 gives it the ability to drive the low impedance, capacitive loads, and large diaphragm excursions associated with planar-magnetic loudspeakers such as Magnepan and Martin Logan electrostatics. The high damping factor is particularly relevant for planars, whose thin-film or ribbon drivers are highly sensitive to amplifier output impedance variations across the audio band. Hegel's own published materials note that the H20's design heritage in the H30 reference circuit directly informs its ability to control difficult loudspeaker loads.

Where can I buy the Hegel H20 in Buffalo, NY or the USA?

The Hegel H20 is available at Vinyl Sound in Buffalo, NY, an authorized Hegel dealer serving audiophiles across western New York and the United States. Vinyl Sound provides expert system matching consultation and in-store or by-appointment demonstration of the H20 paired with preamplifiers and loudspeakers suited to your listening room and system goals.