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AGD Production AGD Alto MKII Reference Preamplifier #1

AGD Production AGD Alto MKII Reference Preamplifier variant 1

AGD Production AGD Alto MKII Reference Preamplifier

Name: AGD Production AGD Alto MKII Reference Preamplifier
Brand: AGD Production
SKU: agd-alto-reference-preamplifier
Rating: 4.5 (4 reviews)

View at AGD Production

Phono Stage

MC/MM Switching

Balanced Output

XLR Input

Remote Control

Home Theater Bypass

Description

The AGD “ALTO” is a complete audiophile Line and Phono Reference Preamplifier that delivers a unique set of features and components in a very compact beautifully crafted single billet aluminum cabinet.
With his built-in fully balanced phono stage (MM & MC), a volume control with the most thermally stable and high precision resistor ladder circuit, the “ALTO” is by design the perfect companion preamplifier for our “TEMPO” and “Audion MkIII” power GaN Amplifiers.

The new MKII release of the ALTO, is availble with optional Digital front end (Streamer and DAC).

The ALTO’s Phono stage, is a fully balanced topology circuitry, with superior sonic performances that will satisfy the most demanding Audiophile.
While The “ALTO” is by design the perfect companion preamplifier for our “TEMPO” and “Audion” Stereo GaN Amplifier, it will also deliver the most sublime and purest sound with any audio system of any standard.
The AGD Audio Design team is confident the “ALTO” will meet your expectations and as a team, we will always stand in support of your needs and future requirements.

Design Philosophy

I have always been driven by my passion to merge perfection and beauty in the art of Audio reproduction.
After the launch of the AGD “TEMPO” we wanted to create a perfect companion preamplifier and so, the AGD “ALTO” is our new compact reference analog preamplifier.
Crafted with the same care and dedication as all AGD products, the “ALTO” is a superior musical preamplifier that incorporates all the design features already adopted in the bigger sibling, the AGD “Andante”.

Main Features

Fully Balanced Phono preamplifier stage with MM & MC cartridges support (selection via Menu and Remote control) and with dedicated ultra-low noise linear power supply and ultra-low noise linear professional grade amplifiers stage.
Analog boards fully shielded and separated from digital boards to deliver the lowest possible noise and prevent any undesired interference.
High Dynamic low noise professional grade instrumentational amplifier stages for the output buffer stage (configurable as bi-amp X-Over upon request).
Fully balanced design and full DC coupling (no capacitors in line with analog signals).
Three Analog inputs with one input fully balanced (XLR connectors).
8bit fully balanced passive Ladder volume control.
Three analog outputs (for multi-amplification solutions.
1 XLR balanced output (6.4VRMS max)
2 Single-ended stereo output (low/high pass X-Over customizable)
Remote control.
12V output Trigger.

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Overall Score 90/100

Deliciously Crispy

AGD Alto MKII Reference Preamplifier

The AGD Production Alto MKII is a compact, transparency-first preamplifier whose standout quality is its whisper-quiet noise floor and fully balanced, capacitor-free analog path. Michael Zisserson at Future Audiophile highlights the unit's very low THD+N and extended bandwidth. Sonically the Alto is slightly warm with strong micro- and macro-dynamics, excellent imaging and palpable vocal texture. Key performance features include a high-performance MM/MC phono stage, precision passive ladder volume control for superb channel separation, and direct-coupled outputs extending response to 100kHz. Build quality is thoughtful and compact — a large front display and robust engineering — though the small chassis constrains balanced I/O. Ideal for vinyl lovers and compact systems that prioritize pure analog transparency over integrated DAC or room-correction features, the Alto is a focused high-performance choice worthy of auditioning.

Future Audiophile

"Total Harmonic Distortion with Noise (THD+N) is a whisper-quiet 0.005 percent, and the bandwidth is 1Hz to 100kHz."

Pros

Exceptionally low noise and very high transparency (THD+N around 0.005% and S/R ≥130dB) that produces a clean, neutral backdrop for detail retrieval.
Integrated high-performance MM and MC phono stage capable of handling vinyl with precision and consistency.
Precision passive ladder volume control plus fully balanced, capacitor-free signal path delivers superior channel separation and convincing imaging.
Extended bandwidth (1Hz–100kHz) and strong dynamics that bring vocals and instruments to life with palpable texture and realistic stage placement.

Cons

Relatively sparse feature set — no internal DAC, room correction, or bass management — which reduces its appeal as an all-in-one component.
Compact, non-standard chassis limits the number of balanced inputs/outputs (only one XLR input and one XLR output), restricting some advanced system configurations.
Early-production units exhibited a clicking issue when changing volume and the supplied plastic remote was described as chintzy and required syncing.

Transparency

93/100

Reviewers highlight the Alto's 'whisper-quiet' THD+N (0.005%) and 'superior noise performance', and the design is fully balanced with no capacitors in the analog signal path — all strong indicators of very high transparency. The spec S/R ≥130dB and direct-coupled outputs support an extremely low noise floor and minimal coloration. Minor early-production clicking when changing volume was firmware-resolved and does not appear to affect noise/floor performance.

Sound Quality

89/100

Dynamics

88/100

The Alto delivers strong micro- and macro-dynamics and is described as having 'strong dynamics' that enliven recordings. That said, reviewers note the Bricasti M20 (at a higher price) has better dynamics and ultra-fine resolution, so while dynamics are very good they stop short of reference-class.

Soundstage Imaging

90/100

Reviewers report excellent imaging and retrieval of small inner details, yielding a realistic sense of being in the audience with well-anchored vocals and palpable texture. The Alto's channel separation (helped by the passive ladder attenuator) supports convincing spatial cues and layering.

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Build Quality

88/100

Construction is thoughtful: fully balanced topology, no coupling capacitors, direct-coupled outputs and a precision passive ladder volume control indicate high-quality engineering and component choices. The compact non-standard form factor and a chintzy-feeling plastic remote are minor negatives, and an early production unit had a volume-click issue that was fixed via firmware.

Features Connectivity

92/100

The Alto offers MM and MC phono support (high-performance phono stage), 2 RCA line inputs, 1 XLR input, 1 XLR output, HT pass-through on Output #3, and an IR remote; the passive ladder volume provides high signal integrity. Its small chassis limits the number of balanced inputs/outputs (only one XLR in and out) and it lacks an internal DAC, room correction or bass management — excellent connectivity for a focused, high-performance preamp but not a feature-packed all-in-one.

Value for Money

88/100

At roughly $4,995 (reviewer noted the nearly $5k price), reviewers call it an 'excellent sounding' high-performance preamp and a disruptive entrant in its segment, which supports a justified premium assessment. Missing integrated features (DAC, room correction, bass management) and potential used-market resale caveats temper the value case, but overall reviewers treat its core performance as commensurate with the price.