Audio Research D-80 Stereo Power Amplifier

Name: Audio Research D-80 Stereo Power Amplifier
Brand: Audio Research
Price: 29000.00 NZD
Availability: OutOfStock

$29,000.00

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The Audio Research D-80 Stereo Power Amplifier represents the next chapter in the company’s legendary history of high-performance vacuum tube amplification. Drawing inspiration from the acclaimed Reference Series, the D-80 delivers the unmistakable musicality of valves with modern engineering, exceptional reliability, and the refined performance expected from a contemporary Audio Research design.

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Specifications

Type Stereo vacuum tube power amplifier
Circuit Design Fully balanced differential Class AB
Power Output 80 watts per channel (20Hz–20kHz)
Output Stage Push-pull KT150 vacuum tube design
Tube Complement 4 × KT150 output tubes, 2 × 6H30 driver tubes
Frequency Response 7Hz – 68kHz (-3dB)
Frequency Response (1W) 0.7Hz – 94kHz (-3dB)
Total Harmonic Distortion Typically <0.04% at 1 watt; approximately 1% at rated output
Overall Negative Feedback 15dB
Voltage Gain 25.5dB
Input Sensitivity 1.4V RMS (Balanced) / 0.7V RMS (Single-Ended)
Input Impedance 300kΩ Balanced / 75kΩ Single-Ended
Output Impedance 4Ω, 8Ω and 16Ω transformer taps
Output Regulation Approximately 1.0dB (16Ω load to open circuit)
Damping Factor Approximately 8
Slew Rate 10V/µs
Rise Time 4.0µs
Output Polarity Non-inverting (XLR Pin 2 positive)
Auto Bias Automatic output tube bias monitoring and adjustment

Connectivity
Connection Details
Inputs 1 × Balanced XLR, 1 × Single-Ended RCA
Speaker Outputs Heavy-duty binding posts with 4Ω, 8Ω and 16Ω taps
Trigger Input 12V trigger for system integration

If I only needed to listen for the sheer pleasure of it, I’d jump on this-here Audio Research D‑80 in a heartbeat.

Soundstage Ultra

Where Heritage Meets Modern Engineering

Designed for listeners who value emotional connection as much as technical excellence, the D-80 combines a fully balanced differential circuit design with premium KT150 output tubes to deliver a powerful, dynamic, and deeply engaging listening experience. With approximately 70–80 watts per channel of valve-driven power, it provides effortless control and exceptional realism across a wide range of high-performance loudspeakers.

At the heart of the D-80 is Audio Research’s refined tube amplifier architecture, featuring a 6H30 input stage and two KT150 output tubes per channel. This carefully engineered design delivers the natural tonal richness, dimensional soundstage, and harmonic detail that make valve amplification so captivating, while maintaining the speed, transparency, and authority required for modern high-end systems.

Advanced Circuit Design, Classic Tube Soul

The D-80 incorporates Audio Research’s advanced automatic biasing system, continuously monitoring and adjusting the output tubes to ensure optimal performance, consistency, and tube longevity. This removes the complexity traditionally associated with valve amplifier ownership, allowing listeners to focus on the music rather than maintenance.

With selectable 4, 8, and 16-ohm speaker taps, balanced inputs, and a robust power supply, the D-80 offers excellent compatibility with a wide range of premium loudspeakers. Its combination of power, refinement, and flexibility makes it equally suited to intimate acoustic recordings, large-scale orchestral works, and everything in between.

Beautifully finished and handcrafted in the USA, the Audio Research D-80 represents the company’s commitment to preserving the magic of valve amplification while delivering the performance and reliability modern audiophiles demand.

Who is this for?

The Audio Research S-200 is designed for discerning listeners who want the commanding power and control of a high-performance solid-state amplifier without compromising on musicality. It is the ideal choice for enthusiasts seeking reference-level performance from a system capable of reproducing music with exceptional scale, realism, and emotional impact.

Whether you're listening at intimate late-night levels or recreating the energy of a live performance, the S-200 delivers effortless dynamics, outstanding transparency, and complete authority over your loudspeakers.

The S-200 is an outstanding foundation for a premium stereo system. It pairs beautifully with Audio Research preamplifiers such as the LS-2, LS-3, and Reference Series, creating a combination that balances precision engineering with an engaging, natural presentation. The S-200 is particularly well suited to medium and large listening rooms where greater amplifier headroom allows music to breathe effortlessly. Its abundant power reserves ensure that orchestral crescendos, cinematic recordings, and high-energy live performances are reproduced with scale, impact, and complete confidence, without sounding strained or compressed.

Is the Audio Research D-80 a tube amplifier?

Yes. The D-80 is a fully balanced vacuum tube stereo power amplifier that uses four KT150 output tubes and two 6H30 driver tubes. It delivers the natural warmth, spacious soundstage, and musical engagement that Audio Research tube amplifiers are renowned for.

How much power does the Audio Research D-80 produce?

The D-80 delivers 80 watts per channel into 4, 8, or 16-ohm loudspeakers via dedicated output transformer taps. This provides ample power for a wide range of premium loudspeakers while preserving the effortless dynamics and refinement of valve amplification.

What type of loudspeakers is the D-80 best suited to?

The D-80 is an excellent match for high-quality bookshelf and floorstanding loudspeakers with moderate to high sensitivity. Its premium output transformers and multiple impedance taps ensure excellent compatibility with a broad range of speaker designs, allowing you to optimise performance for your system.

Does the D-80 require manual tube bias adjustment?

No. The D-80 features Audio Research's automatic bias system, which continuously monitors and optimises the output tubes during operation. This helps maintain consistent performance, extends tube life, and removes the need for routine manual bias adjustments.

What are the advantages of KT150 output tubes?

KT150 tubes are known for their exceptional power handling, low distortion, extended frequency response, and long operating life. In the D-80, they deliver outstanding dynamics, authoritative bass, and exceptional clarity while retaining the natural tonal richness that makes tube amplification so engaging.

Does the D-80 support balanced connections?

Yes. The D-80 includes both balanced XLR and single-ended RCA inputs, making it easy to integrate into virtually any high-end audio system.

Which preamplifier pairs best with the Audio Research D-80?

The D-80 is designed to work seamlessly with Audio Research preamplifiers, including the LS-2, LS-3, LS-28SE, Reference 6SE, and Reference 10. It also pairs beautifully with other high-end balanced preamplifiers that prioritise transparency and low noise.

How does the D-80 compare to the Reference 80S?

The D-80 shares much of the design philosophy and technology found in the Reference 80S, including its balanced architecture and KT150 output stage. It offers the unmistakable Audio Research valve sound in a more streamlined package, making it an outstanding choice for listeners seeking reference-quality performance at a more accessible level.

Does the D-80 generate much heat?

Like all valve amplifiers, the D-80 produces heat during normal operation. Adequate ventilation is essential to ensure optimal performance and long-term reliability. It should be installed with sufficient clearance above and around the amplifier.

How often will the tubes need replacing?

Tube lifespan depends on listening habits and operating conditions, but the KT150 output tubes are designed for excellent longevity. Thanks to the D-80's automatic bias system, the tubes operate under optimal conditions, helping to maximise their service life. Many owners can expect several thousand hours of use before replacement is required.

Audio Research D-80 Stereo Power Amplifier

Is the Audio Research D-80 a tube amplifier?

Yes. The D-80 is a fully balanced vacuum tube stereo power amplifier that uses four KT150 output tubes and two 6H30 driver tubes. It delivers the natural warmth, spacious soundstage, and musical engagement that Audio Research tube amplifiers are renowned for.

How much power does the Audio Research D-80 produce?

The D-80 delivers 80 watts per channel into 4, 8, or 16-ohm loudspeakers via dedicated output transformer taps. This provides ample power for a wide range of premium loudspeakers while preserving the effortless dynamics and refinement of valve amplification.

What type of loudspeakers is the D-80 best suited to?

The D-80 is an excellent match for high-quality bookshelf and floorstanding loudspeakers with moderate to high sensitivity. Its premium output transformers and multiple impedance taps ensure excellent compatibility with a broad range of speaker designs, allowing you to optimise performance for your system.

Does the D-80 require manual tube bias adjustment?

No. The D-80 features Audio Research's automatic bias system, which continuously monitors and optimises the output tubes during operation. This helps maintain consistent performance, extends tube life, and removes the need for routine manual bias adjustments.

What are the advantages of KT150 output tubes?

KT150 tubes are known for their exceptional power handling, low distortion, extended frequency response, and long operating life. In the D-80, they deliver outstanding dynamics, authoritative bass, and exceptional clarity while retaining the natural tonal richness that makes tube amplification so engaging.

Does the D-80 support balanced connections?

Yes. The D-80 includes both balanced XLR and single-ended RCA inputs, making it easy to integrate into virtually any high-end audio system.

Which preamplifier pairs best with the Audio Research D-80?

The D-80 is designed to work seamlessly with Audio Research preamplifiers, including the LS-2, LS-3, LS-28SE, Reference 6SE, and Reference 10. It also pairs beautifully with other high-end balanced preamplifiers that prioritise transparency and low noise.

How does the D-80 compare to the Reference 80S?

The D-80 shares much of the design philosophy and technology found in the Reference 80S, including its balanced architecture and KT150 output stage. It offers the unmistakable Audio Research valve sound in a more streamlined package, making it an outstanding choice for listeners seeking reference-quality performance at a more accessible level.

Does the D-80 generate much heat?

Like all valve amplifiers, the D-80 produces heat during normal operation. Adequate ventilation is essential to ensure optimal performance and long-term reliability. It should be installed with sufficient clearance above and around the amplifier.

How often will the tubes need replacing?

Tube lifespan depends on listening habits and operating conditions, but the KT150 output tubes are designed for excellent longevity. Thanks to the D-80's automatic bias system, the tubes operate under optimal conditions, helping to maximise their service life. Many owners can expect several thousand hours of use before replacement is required.

The D‑80’s 70 watts per channel were plenty for my listening habits. I like to listen loud, but at no point did I feel like I needed more power. In fact, the D‑80 was a champ at portraying dynamic contrasts, going from a whisper to a howl in nothing flat.

That consistency is the joy of this amplifier. If you have a yearning for Big Boy Audio Research, but don’t want or need the additional power and the increased size, space, heat and price tag that top-end amplification requires, the Reference 80S is perfect.

Little we’ve heard at this level delivers that with anything approaching the transparency and naturalness of this AR pairing. If you crave an unexaggerated and essentially honest rendition of a recording, this amplifier pairing must be heard.

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