AGD Production AGD SOLO
AGD’s SOLO monoblocks unite explosive dynamics with a remarkably natural, velvety treble, delivering richly weighted bass, unveiled vocals, and a spacious image that detaches effortlessly from the speakers. The Absolute Sound found them composed with demanding electrostatics, making these high-power GaN amplifiers a compelling reference for listeners chasing realism without strain.
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Deliciously Crispy
Sound Quality
96/100
Build Quality
89/100
Value for Money
94/100
Pros
Exceptionally clear, believable timbre and microtransient detail, especially on drums and vocals.
Tight, controlled bass retains body, richness, and a liquid sense of weight rather than sounding dry or sterile.
Wide, deep, speaker-disappearing soundstage with distinct performers and preserved low-level spatial detail.
Effortless high-power control, including with difficult Sound Lab electrostatic speakers.
Cons
A premium-priced proposition, placing it beyond many system budgets.
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What Reviewers Are Saying
SOUND QUALITY PERFORMANCE 96/100
The review describes an unusually complete presentation: highly resolved treble and low-level spatial information, natural and richly weighted bass, and a wide, deep image detached from the loudspeakers. It also praises the amplifier's ease, realism, and freedom from edge with demanding musical peaks.
Transparency Resolution
96/100
The reviewer hears top-end detail and clarity preserved by the amplifier's wide bandwidth, with vocals presented as “completely unveiled.” Drum timbres and very soft vocal details are described as exceptionally clear and believable, while low-level spatial cues remain intact.
Tonal Balance Musicality
96/100
Rather than sounding dry or sterile, the SOLO is said to combine tight bass control with body, richness, and a liquid foundation. Treble stays velvety and natural rather than strident, and the overall presentation was involving enough to make the reviewer forget about the equipment.
Dynamics
97/100
The SOLO is praised for rendering transient events and microdynamic detail with exceptional clarity, while moving from gentle vocal passages to full-throated peaks without strain or hardness. It never suggested it was nearing its limits, including when driving difficult Sound Lab electrostatic speakers.
Soundstage Imaging
96/100
The reviewer reports a wide, deep soundstage that made the listening-room walls seem to disappear. Individual performers remained distinct, surrounded by gentle air, with the presentation consistently held free of the speaker cabinets.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
89/100
The 45-pound monoblock is described as efficiently packaged, with its GaN implementation reducing the need to prioritize heat dissipation. AGD supplies the amplifiers in sturdy branded flight cases, though the review offers limited direct comment on chassis finish, internal layout, and long-term durability.
Value for Money
94/100
At approximately $23,500 per pair in the review, the SOLO is plainly acknowledged as expensive. However, the reviewer felt its ability to compete comfortably with substantially costly equipment changes that perspective and went so far as to call it a bargain.
Reviews & Sources
Professional reviews and sources for this product's Watt'n Potatoes analysis.
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Specifications
- THD+N 10W/1KHz
- <0.005%
- Maximum Output Power at 0.1% THD+N, 1KHz, 8Ω
- 300W
- Audio Bandwidth ±0.5dB
- 20Hz-20KHz
- Bandwidth ±3dB
- 5Hz-80KHz
- Input Impedance
- 40kOhm (600Ohm upon request)
- GaN Power Module PWM Frequency
- ~800kHz
- Dimensions
- 14.5x11.25x6.5 inches 370x285x165mm)
- Weight
- 45lbs (20kg)
- Input Voltage
- 110-240V (User selectable)
Manufacturer's Description — AGD Production
Design Philosophy
The AGD SOLO GaN Monoblock Limited Edition amplifier is the most powerful amplifier of the AGD family.
Combining the world-wide recognized innovative AGD GaN technology with a new and always unique and elegant design, this amplifier promises to drive any demanding loudspeaker with outstanding results in terms of dynamics, details, and stage.
The AGD SOLO is rated 600W max on 4ohm and it is characterized by an outstanding >70A peak output driving capability.
GaN-Sound Power Monoblock
The AGD SOLO MONOBLOCK uses the same fundamental technology pioneered with the AGD Gran Vivace, AGD TEMPO, AGD AUDION, the first true Hi-End amplifiers based on Gallium Nitride power MOSFET
With the AGD SOLO, we have extended the use of the latest generation power semiconductors, GaN MOSFET up to a new level of overall sonic performances.
Thanks to the new GaNSound module improved components, enhanced thermal management, and a new optimized layout, we achieved our target to operate this much larger power stage at 800kHz, for the utmost outstanding sonic and musical performances.
The New AGD GaN-Sound Module
Also, with the AGD SOLO we have retained the key fundamental feature of upgradable GaNSound power module.
This is a key feature AGD has maintained with all amplifier designs, from the Audion to the Gran Vivace, the Tempo, and now the SOLO.
At AGD, we firmly believe the customers have the right to maintain the value of their investment; therefore, we enable upgrading the GaN output stage module when a new GaN MOSFET device delivers performance and technological improvement.
The GaN technology in power semiconductors is only ten years old versus 60 years of silicon technology evolution.
New improved GaN MOSFETs will, therefore, deliver augmented sonic performances using an upgraded module in the form of a new GaNTube or, like in the DUET and TEMPO and now the AGD SOLO, via a dedicated daughter board, easy to plug-in.
Main Board
The AGD SOLO new main board is a 4 layers PCB designed with the utmost attention to minimize the noise and limit the parasitics with an optimal control of the layout.
With extra large and thick copper traces (2oz), the new board presents a perfect ultra-low resistive path for high current flow and minimized stray inductance, allowing unprecedented rise and fall times.
The AGD SOLO main board is designed to accommodate an additional capacitor bank (on top of the one housed on the power supply circuit) up to ~200,000µF, a key feature to support the most dynamic current demand of the most difficult loads.
Moreover, the AGD“GaNSound” Module is easily removable for future upgrades and has an additional copper heat-spreader to maintain the most stable and safe temperature during operation.
New Smart Linear Power Supply
The AGD SOLO features a linear power supply with two SMART bridge rectification stages to minimize the conduction losses and virtually eliminate the reverse recovery losses.
The power supply section is characterized by an oversized 700VA ultra-low noise toroidal transformer, completely encapsulated in resin inside a dedicated enclosure; the construction is virtually noise and vibration-free,
The total bulk capacitor bank of ~200,000µF makes available a surplus of dynamic power with unprecedented peak current capability for the most extended time.
Verified Dealers
Online Dealers
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Authorized dealers for AGD Production AGD SOLO
- Audio Gallery — online and in-store — Las Rozas de Madrid, Comunidad de Madrid, Spain (website)
- Audiophile Zone — online and in-store — Baywood-Los Osos, California, United States (website)
- Delve Audio — in-store — Caldwell, New Jersey, United States (website)
- Dr Vinyl — in-store — Middle River, Maryland, United States (website)
- e11even stereophonic — in-store — Atlanta, Georgia, United States (website)
- ECRIN DE FRANCE — in-store — Roubaix, Hauts-de-France, France (website)
- Hifi-Connect France — in-store — Perpignan, Occitanie, France (website)
- Indie Hifi — in-store — New Farm, Queensland, Australia (website)
- Maco — online and in-store — Old Toronto, Ontario, United States (website)
- Next Level HiFi — online and in-store — Wayne, Illinois, United States (website)
and 4 more verified dealers