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AGD Production AGD SOLO
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.
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AGD SOLO — GaN monoblock power for high-dynamics systems
The AGD SOLO is a high-current, limited-edition monoblock that pairs modern GaN power switching with a low-noise smart-rectifier supply, delivering muscular transient speed and granular transparency. Reviewers at Audiophilepure highlight the amplifier's double-rectification topology and carefully sourced transformer, which together suppress rectifier noise and preserve micro-detail.
With measured outputs of 600W (4Ω) and 300W (8Ω), THD+N <0.005% and a 5Hz–80kHz bandwidth, the SOLO delivers authoritative bass control, clean mids and extended treble, plus stable imaging and channel separation. The monoblock layout and ~800kHz PWM GaN module underpin strong dynamics and headroom, making it ideal for demanding speakers and high-dynamic music. Build quality and component selection reflect a boutique, premium design that will appeal to listeners prioritizing transparency and slam, though pricing sits at the high end.
Pros
- Exceptional dynamics and headroom enabled by the GaN monoblock design and high measured outputs (600W/4Ω, 300W/8Ω).
- Very low noise and high transparency owing to the double-rectification smart-rectifier topology described by reviewers.
- Premium build and component sourcing, including a bespoke transformer from a specialized Italian manufacturer, indicating careful construction and power-supply engineering.
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Cons
- Pricing is positioned at a premium and appears inconsistent across sources, which may complicate value comparisons for buyers.
Sound Quality
91/100
Dynamics
92/100
Monoblock GaN power module design and high ratings (300W/8Ω, 600W/4Ω) suggest strong headroom and current delivery; the ~800kHz GaN PWM and reviewer notes about the power-supply topology support fast transient capability. The monoblock layout (explicit in the product/review title) typically improves supply stiffness and channel independence, which merits a +1 boost to dynamics. No reviewer reported running out of headroom or control issues; score reflects excellent, but not explicitly 'reference' level, dynamics.
Soundstage Imaging
89/100
High output, low-noise supply topology and wide bandwidth (5Hz–80kHz ±3dB) support stable imaging, good channel separation and scale. While reviewers did not provide extensive spatial impressions, the technical evidence (high power, GaN switching, quiet rectification) points to strong, well-defined soundstaging under typical loads.
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Build Quality
93/100
Review details a robust power-supply approach (double rectification with smart-rectifier) and deliberate transformer sourcing with stringent magnetic/electrical specs from a specialized Italian manufacturer — evidence of careful component selection and construction. The product is presented as monoblock units, which typically require more substantial internal transformer and capacitor arrangements and improves mechanical and electrical separation between channels; overall construction and thermal/power design appear top-tier without an explicit claim of being 'reference' level.
Value for Money
86/100
Reviewer title lists a price of $12,999 while product metadata shows a different figure (23,500), and the review text offers no explicit value judgment. Given the high power, modern GaN topology, and robust supply design, the amplifier likely commands a premium; however, absent clear reviewer language about price fairness or comparisons to peers, the score defaults to a neutral baseline (mid-80s).
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