Accuphase A-80 Class-A Stereo Power Amplifier

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Accuphase A-80 Class A Stereo Power Amplifier Reference grade Class A power built for total control over any loudspeaker load. A Class A Amplifier Built Without Compromise The Accu phase A-80 is a pure Class A stereo power amplifier, which means every output transistor stays fully biased on at all times, regardless of how loud or quiet the music gets. Most amplifiers switch their output devices on and off many times per second to save power and reduce heat, and that switching introduces a small but audible artifact called crossover distortion right at the point where the waveform crosses zero. Class A operation removes that switching entirely. The result is a smoother, more linear signal path that listeners describe as warmer and more natural, particularly on vocals, strings, and anything with delicate harmonic detail. The tradeoff is that Class A amplifiers run warm and draw more power at idle than a typical Class AB design, and the A-80 is built with that tradeoff fully accounted for in its chassis and ventilation. Ten Parallel Push Pull MOSFETs in the Output Stage Inside the A-80, each channel uses ten parallel push pull power MOSFETs working together in the output stage. Running that many devices in parallel spreads the current load across more silicon, which lowers the stress on any single transistor and lets the amplifier deliver serious current into difficult loads without strain. That architecture is why the A-80 is rated at 65 watts per channel into 8 ohms but climbs to 520 watts per channel into 1 ohm. Most loudspeakers never present a true 1 ohm load, but many high end speakers dip well below 4 ohms at certain frequencies, especially in the bass. An amplifier that can double its output as impedance is cut in half, the way the A-80 does moving from 8 ohms to 4 ohms to 2 ohms, is telling you it has the current reserves to control a speaker rather than just power it. Balanced Remote Sensing and a Damping Factor of 1,000 Damping factor describes how well an amplifier can control a speaker cone after it sends the signal, essentially how quickly the amp can stop the cone from moving once the musical note has passed. A higher damping factor means tighter, more defined bass with less overhang or boom. The A-80 achieves a damping factor of 1,000 or greater through a technique Accuphase calls balanced remote sensing, which feeds back both the signal and the ground reference from the point closest to the speaker terminals rather than from inside the amplifier circuit itself. That extra sensing loop compensates for the small losses that occur in speaker cable and connections, so the amplifier is effectively controlling the speaker cone directly rather than through a chain of resistance it cannot see. Paired with a two stage gain structure, a 22 dB gain in the low noise signal input section and 6 dB in the power amplification section, the A-80 keeps its noise floor extremely low while still delivering full output. Power Supply and Chassis Built for the Long Term A Class A amplifier lives or dies by the quality of its power supply, since it needs to sustain full bias current continuously rather than only on demand. The A-80 is built around a large, high efficiency toroidal transformer and 120,000 microfarads of filtering capacitance, giving the output stage a deep, stable reserve of current to draw from during dynamic peaks. The chassis uses an aluminum hairline finish top plate and high carbon cast iron insulator feet, which Accuphase selected specifically for their damping characteristics, reducing the amount of mechanical vibration that reaches the sensitive circuitry inside. Every A-80 is hand built in Japan, and the fit and finish reflect that, from the bar graph power meters on the front panel to the internal circuit boards, which use glass cloth fluorocarbon resin for the power amplification section. Bridged and Bi Amp Operation for System Flexibility The A-80 includes an operation mode selector on the rear panel that allows two units to be linked in bridged mode, which combines both channels into a single, more powerful mono output, roughly four times the stereo power per amplifier. Two A-80 units bridged this way deliver 260 watts per channel into 8 ohms, scaling up to 1,040 watts into 2 ohms. The same two units can instead be configured for bi amping, where one A-80 drives the high frequency section of a speaker and a second drives the low frequency section through the speaker's separate binding posts. Bi amping reduces interaction between the high and low frequency ranges and gives each driver section its own dedicated power supply and output stage, which many listeners find opens up detail and control that a single stereo amplifier cannot match on demanding speakers. How the A-80 Compares to the Accuphase A-48S Inside the Accuphase Class A lineup, the natural comparison to the A-80 is the A-48S. The A-48S delivers 30 watts per channel into 8 ohms, roughly half the output of the A-80, and is built around a smaller output stage and power supply to match. For most bookshelf speakers and easier to drive floorstanding designs in a moderately sized room, the A-48S is plenty of amplifier and costs meaningfully less. The A-80 earns its place above it when the speakers get harder to drive, the room gets larger, or the listener simply wants more current in reserve for peak passages without ever approaching clipping. Both amplifiers share the same fundamental Class A philosophy and balanced remote sensing technology, so the decision between them comes down to how much headroom your speakers and your room actually demand, not a difference in sonic character. Key Specifications Rated Output, Stereo: 65 W per channel into 8 ohms, 130 W into 4 ohms, 260 W into 2 ohms, 520 W into 1 ohmRated Output, Bridged Mono: 260 W into 8 ohms, 520 W into 4 ohms, 1,040 W into 2 ohmsAmplifier Class: Pure Class AOutput Stage: 10 parallel push pull power MOSFETs per channelDamping Factor: 1,000 or greaterTotal Harmonic Distortion: 0.03% at 4 to 16 ohms, 0.07% at 2 ohms, 0.05% bridged at 4 to 16 ohmsIntermodulation Distortion: 0.01%Frequency Response: 20 Hz to 20 kHz (+0/-0.2 dB) at rated output, 0.5 Hz to 160 kHz (+0/-3.0 dB) at 1 wattSignal to Noise Ratio: 123 dB at MAX gain, 129 dB at -12 dB gain, A weightedInput Impedance: 40 kilohms balanced, 20 kilohms unbalancedInputs: Balanced XLR and unbalanced RCAGain Control: 4 step selector, MAX / -3 dB / -6 dB / -12 dBPower Requirements: 120V AC, 50/60 Hz (also available in 220/230V versions)Power Consumption: 211 W idle, 260 W in accordance with IEC 62368-1, 0.3 W standbyDimensions (W x H x D): 465 x 240 x 515 mm (18.3" x 9.4" x 20.3")Weight: 44.6 kg (98.4 lbs) net, 54 kg (119 lbs) in shipping cartonPrice: $25,975.00 Why Buy From All Elite Audio All Elite Audio is an authorized Accuphase dealer, which means every A-80 we sell comes with a full manufacturer warranty, genuine factory support, and a unit that was never gray market imported. Our Timonium showroom is set up for real listening sessions, not just a spec sheet handoff, so you can hear the A-80 driving speakers before you commit to it. Our team can also help you match it correctly to your speakers, your room, and the rest of your system, including whether bridged or bi amp operation makes sense for your setup. Call: 443-402-5055Text: 443-402-5064Visit: 1921 York Rd, Timonium, MD 21093 Frequently Asked Questions Do I need a separate preamplifier to use the A-80?Yes, a preamplifier is required, since the A-80 has no gain control or source selection of its own beyond its fixed gain selector. The preamplifier handles volume, source switching, and any phono stage duties if you play vinyl. Our team at All Elite Audio can help you choose a preamplifier that matches the A-80's balanced circuit design and current feedback topology so the pairing performs at its best. How does the A-80 compare to the Accuphase A-48S?The A-48S delivers 30 watts per channel into 8 ohms compared to the A-80's 65 watts, and it uses a smaller output stage and power supply to match that lower rating. Both models share the same Class A philosophy, balanced remote sensing, and overall build quality, so the difference is really about headroom rather than sound character. The A-80 makes sense for larger rooms or harder to drive speakers, while the A-48S is often plenty of amplifier for bookshelf speakers or easier floorstanding designs at a lower price. What does damping factor mean and why does 1,000 matter?Damping factor measures how tightly an amplifier can control a speaker cone once a note has passed, effectively how quickly it can stop unwanted cone movement. A higher number generally means tighter, more defined bass with less boom or smear. The A-80 reaches a damping factor of 1,000 or greater through balanced remote sensing, which feeds back the signal and ground reference from a point close to the speaker terminals rather than from inside the amplifier, compensating for losses in the speaker cable itself. What does Class A operation actually mean for sound quality?Class A means every output transistor stays continuously biased on, rather than switching on and off many times per second the way most amplifiers operate. That continuous bias eliminates crossover distortion, the small artifact that occurs where a switching amplifier's waveform crosses zero. Listeners typically describe the resulting sound as smoother and more natural, particularly through the midrange and on vocals. The tradeoff is that Class A designs run warmer and consume more power at idle, which the A-80's chassis and power supply are built to handle. Can the A-80 drive difficult, low impedance speakers?Yes, the A-80 is rated to deliver full linear power down to 1 ohm, reaching 520 watts per channel at that load. Its ten parallel push pull MOSFET output stage per channel spreads current delivery across more devices, which reduces stress on any single transistor when a speaker's impedance drops during demanding bass passages. This makes the A-80 a strong match for high end speakers that present a challenging load at certain frequencies, not just speakers with a flat, easy 8 ohm rating. Does the A-80 run hot, and what ventilation does it need?As a pure Class A amplifier, the A-80 runs continuously warm even at idle, drawing 211 watts simply sitting in standby operation. It should be placed in an open area with clear airflow around the top and sides, not enclosed in a sealed cabinet or stacked tightly against other components. This is normal behavior for any true Class A design and is part of what allows it to deliver such clean, linear power. Can I bridge two A-80 units together for mono operation?Yes, the A-80 includes an operation mode selector on the rear panel that lets two units be configured for bridged mono operation. In bridged mode, each unit's two channels combine into a single high powered mono channel, delivering 260 watts into 8 ohms and scaling up to 1,040 watts into 2 ohms. This setup is typically used by listeners who want maximum control over a single pair of demanding speakers, with one dedicated amplifier per speaker. What is bi amping, and can the A-80 be used this way?Bi amping means using two amplifiers on a single speaker, with one driving the high frequency section and the other driving the low frequency section through the speaker's separate binding posts. The A-80 supports this configuration through the same rear panel operation mode selector used for bridging. Bi amping reduces interaction between the high and low frequency ranges and gives each driver section its own dedicated power supply, which can noticeably improve control and detail on speakers designed to accept it. What is the warranty on the Accuphase A-80?Accuphase amplifiers purchased through an authorized dealer are covered by a manufacturer's warranty, with exact terms confirmed at the time of purchase. Buying through All Elite Audio as an authorized Accuphase dealer ensures your unit qualifies for that full manufacturer support rather than the reduced or voided coverage that can come with gray market imports. Our team can walk you through the specific warranty terms in effect when you place your order. Where can I buy the Accuphase A-80 in Maryland?All Elite Audio, located at 1921 York Rd, Timonium, MD 21093, is an authorized Accuphase dealer and has the A-80 in stock. You can call 443-402-5055, text 443-402-5064, or visit the showroom in person to hear the amplifier and speak with our team directly. As an authorized dealer, every unit we sell comes with full manufacturer support and genuine factory backing. Show more