Dan D’Agostino PROGRESSION S350 STEREO AMPLIFIER
Commanding yet finely nuanced, the Progression S350 pairs 350W per channel with immense speaker control, transparent resolution, and a vast, precisely layered soundstage. Enjoy The Music praised its lifelike detail and image solidity, while HiFi News found rare treble delicacy alongside formidable power. It is a compelling reference-grade engine for revealing loudspeaker systems.
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Deliciously Crispy
Sound Quality
96/100
Build Quality
91/100
Value for Money
88/100
Pros
Exceptional transparency and low-level detail reveal familiar recordings with striking lifelike clarity.
Vast, immersive soundstage with excellent separation in dense mixes and exceptionally solid center imaging.
Combines formidable power delivery and lower-octave weight with silky, refined, non-screechy treble.
Cons
Its 115-pound chassis requires a two-person lift and thoughtful placement.
Balanced XLR-only connectivity limits compatibility with preamplifiers lacking balanced outputs.
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What Reviewers Are Saying
SOUND QUALITY PERFORMANCE 96/100
Reviewers hear an unusually complete blend of extreme transparency, natural delicacy, immense control and genuinely large-scale spatial presentation. Its revealing nature also means that recording and upstream-component quality remain plainly exposed.
Transparency Resolution
97/100
Enjoy the Music calls transparency “the epitome” of the S350’s sound and reports hearing familiar recordings as though for the first time. The same review praises exceptional low-level detail and lifelike clarity, while HiFi News finds a meaningful step up in upper-frequency delicacy over earlier Progression models.
Tonal Balance Musicality
95/100
HiFi News praises the amplifier’s silky, sweet and subtle treble, notably free of screech, alongside greater lower-octave weight. Despite its highly revealing presentation, reviewers describe it as graceful and involving rather than merely analytical.
Dynamics
96/100
HiFi News describes a powerhouse with seemingly unlimited reserves and command regardless of source or system. Enjoy the Music reports fierce speaker grip, excellent transient response and convincing micro- and macro-dynamic capability; the 350W/8-ohm, 700W/4-ohm and 1,400W/2-ohm ratings support that impression of substantial load-driving ability.
Soundstage Imaging
97/100
Enjoy the Music finds its separation in dense mixes previously unmatched, with a vast stage extending behind, between and beyond the speakers. It also praises extraordinary center-image solidity, while HiFi News heard an enormous, enveloping presentation with voices seeming to appear from nowhere.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
91/100
The S350 is a substantial 115-pound amplifier in an anodized-aluminum chassis, and HiFi News characterizes it as less fussy and apparently utterly bombproof. Its execution is intentionally focused, with balanced XLR inputs and robust multi-way speaker terminals rather than an expansive connection complement.
Value for Money
88/100
At roughly $30,000–$33,000, this is a costly amplifier, but HiFi News considers its sonic performance comparable to an earlier Momentum model that cost about £20,000 more. Enjoy the Music recommends it to listeners who can afford it, while Audiophilepure suggests it would be interesting to compare it with amplifiers costing two or three times as much; the reviews support a justified premium rather than an outright bargain claim.
Reviews & Sources
Professional reviews and sources for this product's Watt'n Potatoes analysis.
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Specifications
- Frequency Response
- 1 Hz to 80 kHz, -1 dB / 20 Hz to 20 kHz, ±0.01 dB
- Signal-to-Noise Ratio
- >75 dB, A-weighted / >105 dB, unweighted
- Distortion
- 0.015% @ 1 kHz, 350 W per channel @ 8Ω
- Input Impedance
- 100 kΩ
- Output Power (per Channel)
- 350 W @ 8Ω / 700 W @ 4Ω / 1,400 W @ 2Ω
- Output Impedance
- 0.1Ω
- Inputs
- 1 pair balanced XLR stereo
- Outputs
- 2 pair binding posts
- Dimensions (WHD)
- 17.875 x 9.0 x 23.0 in / 45.4 x 23.0 x 58.4 cm
- Weight
- 115 lb / 52.2 kg
- Finish
- Silver or Black
Manufacturer's Description — Dan D’Agostino
Power and Performance
The Progression S350 Stereo Amplifier leverages the innovative Super Rail circuitry employed in the M550 Monoblock, unique technology whose output stage operation results in improved dynamics, lower distortion, and a fierce grip of the loudspeaker. Every amplifier employs positive and negative voltage rails that deliver power to the speaker. The music signal swings between these two rails, but due to natural loss, the signal never reaches the output rails’ full capability. A Super Rail overcomes this limitation by boosting voltage in the sections prior to the output stage.
A Substantial Foundation
Abundant power is required for realistic sound quality and is a cornerstone of Dan D’Agostino Master Audio Systems’ amplifier design. The graceful, anodized aluminum chassis of the Progression S350 houses a 2,000 VA power supply transformer coupled to nearly 100,000 microfarads of power supply storage capacitance. Paired to this foundation is a fully complementary driver stage, and output circuitry outfitted with 48 power transistors—24 each for the left and right channels generating an imposing output. Initially used in the Relentless Series, the output power device provides the foundation for an upgraded output stage. This transistor extends high-frequency response, increases power handling 50%, and features tighter tolerance gain matching between complementary NPN/PNP pairs. A wider safe operating area and superior gain linearity provides greater thermal stability throughout the amplifiers’ power delivery. Coupling the new output device to the high efficiency heatsink allows operating bias to be increased, lowering crossover distortion and improving instrumental timbre and tonal accuracy.
Elegantly Powerful
Drawn directly from the Relentless M550 Monoblock Amplifier, each heatsink is milled from a single, 48.5-pound (22 kg) aluminum billet slab whose highly efficient elliptical form dramatically improves cooling ability and assures reliable operation even when delivering full-rated power, an impressive 350 watts per channel into 8 ohms. Output doubles to 700 watts per channel into 4 ohms and 1,400 watts per channel into2 ohms.
Combining innovative circuitry and significant power, the Progression S350 Stereo Amplifier lets loudspeakers achieve their full sonic potential, with music’s dynamic contrasts and leading-edge transients spectacularly depicted and faithfully reproduced.
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Authorized dealers for Dan D’Agostino PROGRESSION S350 STEREO AMPLIFIER
- Absolute Audio - Canada — in-store — Calgary, Alberta, Canada (website)
- Absolute Sounds — in-store — London, England, United Kingdom (website)
- Acoustic Designs Inc. — in-store — Scottsdale, Arizona, United States (website)
- Alma Music & Audio — online and in-store — San Diego, California, United States (website)
- Alpha High End — online and in-store — Brasschaat, Vlaams Gewest, Belgium (website)
- Area Hifi — online and in-store — L'Eixample, Comunidad Valenciana, Spain (website)
- Audible Images — in-store — Melbourne, Florida, United States (website)
- Audio Concepts - USA — in-store — Dallas, Texas, United States (website)
- Audio Element — in-store — Pasadena, California, United States (website)
- Audio Excellence (CA) — online and in-store — Markham, Ontario, Canada (website)
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