What's unique about the brand
AGD Productions uses GaN (Gallium Nitride) technology in their amplifiers, which are housed in glass tubes reminiscent of classic vacuum tubes, delivering high power from a compact size with near-perfect square waves. The amplifiers are designed to be upgradeable as technology advances, with GaN modules that can be replaced, while handling complex impedance loads similar to high-end Class-A or SET tube amps.
What reviewers are saying
We read all the reviews. Here's what reviewers feel most strongly about:
- AGD amplifiers use a patented GaNTube design, encasing the Gallium Nitride MOSFET power stage within a removable glass tube reminiscent of a vacuum tube, allowing for modular upgrades by simply swapping the "tube."
- Their designs emphasize a specific "AGD sound" that aims for a combination of qualities typically associated with different amplifier classes, striving to deliver SET-like musicality and harmonic richness with the power, control, and detail of solid-state Class D designs.
- AGD products showcase a unique industrial design blending modern aesthetics with retro cues like the glowing tubes and polished aluminum finishes.
- The brand utilizes high PWM frequencies in its Class D designs, typically around 800kHz, enabling increased accuracy and reduced high-frequency artifacts.
Our favorite reviewer quotes:
- "Making Music From the moment these attractive little monoblocks were dropped into my reference system, replacing my nearly twice as expensive reference Audionet MAX monoblocks , they made it clear they weren't fooling around! One of the first attributes to surface was the distinct and complete grip they brandished over my reference Von Schweikert Audio ULTRA 9 loudspeakers." (https://positive-feedback.com/reviews/hardware-reviews/agd-productions-gran-vivace-monoblock-amplifier)
- "AGD's technology gives you the sound stage goose bumps. The rest of the recording was pretty doggone sweet, but the sound staging on this track when delivered by the Audions was some of the best I have heard in the last 30 years, bar none." (https://positive-feedback.com/reviews/hardware-reviews/agd-audion-amplifier)
- "Putting on Robbie Robertson's Music for the Native Americans (Tidal MQA), many elements were so quick and agile and beautiful that the second and third tracks literally brought me to tears. Light of foot and deft in all movements, it reminded me of watching the young women's "Fancy Shawl" or "Jingle Dress" competition events at the Gathering of Nations Pow Wow here in Albuquerque every year (the largest Native American pow wow in North America)." (https://www.theabsolutesound.com/articles/agd-productions-alto-preamplifier-and-tempo-power-amplifier)
- "From the moment the atmosphere is created by tree-frogs chirping, bowed-bass gently sliding into the soundstage, and muted-harmonics on the stringed instruments, the Tempo showed why it clearly can claim it possess the qualities of a Class-A or SET amplifier. Not only were these instruments clear, honest, and seamless sounding in all aspects true to their nature, each artist's individual messages came through creating a breathtaking soundscape." (https://futureaudiophile.com/agd-productions-tempo-gan-amplifier-reviewed)
- "All the warmth and beauty that is usually available with Class A amplifiers is here with the Duets, without the drawbacks. There is no sense of harshness or the brittle sound that so often is associated with Class D amplifiers." (https://positive-feedback.com/reviews/hardware-reviews/waters-on-the-hardware-the-alberto-guerra-design-agd-duet-monoblock-amplifier)
- "Along with their remarkable power and control, they also excel at conveying the speed of instrumental attack, especially notable with stringed instruments from violins and cellos to pianos and harps. This uninhibited sense of rise speed carries over, exhibiting an equally impressive ability to render decay and trail." (https://positive-feedback.com/reviews/hardware-reviews/agd-productions-gran-vivace-monoblock-amplifier)
- "The switching is extremely fast and the attack of notes is immediate, yet not etched or subject to ringing. Music just happens the way it does in real life." (https://www.enjoythemusic.com/superioraudio/equipment/0820/AGDAndantePreamplifierVivaceMonoblocks_Review.htm)
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Lineup comparison
We think it's helpful to understand how their products compare. To learn more about each, scroll to the section above to click through to individual product pages.
ALTO
- Positioning: A compact reference preamplifier designed as an ideal partner for AGD's power amplifiers.
- Description: Features a fully balanced analog phono stage with a precise resistor ladder volume control in a single billet aluminum chassis. Offers straightforward functionality, making it suitable for small setups compared to the Andante's advanced digital-analog mix and the power-focused designs of the TEMPO, AUDION, and GRAN VIVACE.
ANDANTE
- Positioning: A high-end hybrid preamplifier that integrates analog and digital circuitry for critical listening.
- Description: Provides a 100% discrete R2R DAC with improved clock stability, galvanic isolation, and an enhanced phono stage to deliver finer detail. Compared to the compact simplicity of the Alto and the power-enhancing roles of the TEMPO and AUDION, the Andante suits users who demand more technical sophistication and comprehensive connectivity for both analog and digital sources.
TEMPO
- Positioning: An entry-level stereo power amplifier that uses modern GaN technology.
- Description: Uses a GaN-based power stage with high PWM frequency operation, ensuring efficient and low-noise performance in a compact CNC-machined cabinet.
AUDION
- Positioning: A compact monoblock amplifier that combines quick switching and precise power delivery in a minimalistic design.
- Description: Uses Gallium Nitride MOSFET power stages enclosed in a glass tube to deliver 200W with low noise and fast response characteristics. Unlike the TEMPO's stereo design and before the premium GRAN VIVACE, the AUDION offers a step-up in performance.
GRAN VIVACE
- Positioning: A flagship monoblock amplifier built for high-end systems and demanding loudspeaker setups.
- Description: Features dual 600V GaN MOSFETs switching at 800kHz, delivering high peak output and exceptional current drive capability. Compared to the AUDION and TEMPO, the GRAN VIVACE stands out with its advanced thermal design and highest power output.
Used
AGD
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What are your favorite tracks for showcasing the strength of your products?
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Our interview with the brand
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