The Dan D'Agostino Progression S350 Stereo Amplifier brings the remarkable power, speed, and refinement of the Progression Series into a versatile single-chassis stereo design. Available through Trimira Audio, Brisbane’s premier destination for ultra-high-end HiFi, the S350 incorporates key architectural advancements derived directly from the flagship Relentless Monoblock.
Delivering an authoritative 350 Watts per channel into 8 Ohms, the Progression S350 doubles its output linearly to 700 Watts into 4 Ohms and 1,400 Watts into 2 Ohms. Whether driving complex, power-hungry loudspeakers or delicate high-efficiency designs, the S350 maintains unflappable composure, expansive soundstaging, and liquid detail.
Key Features & Technological Innovations
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Relentless-Derived Elliptical Heatsinks: Features cooling fins precision-milled from massive 48.5 lb (22 kg) solid aluminum billets. The highly efficient elliptical form expands surface area, allowing a higher operating bias while keeping operating temperatures stable under intense demand.
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Extended Pure Class A Performance: Upgraded output devices paired with high-efficiency thermal dissipation allow an increased operating bias—extending pure Class A performance up to 45 Watts, delivering natural instrumental timbres and smooth harmonic richness.
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Exclusive Super Rail Topology: Utilizes higher voltage supply rails in the sections prior to the output stage (acting like a turbocharger for audio signals) to maximize signal swing, lower distortion, and maintain a firm grip on the speaker drivers.
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48 High-Speed Output Transistors: Driven by 48 ultra-fast output transistors—first introduced in the Relentless series—handling four times the power and offering exceptional gain matching between complementary pairs.
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Heavy-Duty 2,000 VA Transformer: Powered by a massive 2,000 VA power supply transformer and nearly 100,000 µF of filter capacitance, supplying immediate current during demanding dynamic passages.
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Dual 180-Degree Ballistic Power Meters: Features an anodized aluminum faceplate with twin analog watch-dial power meters. High-speed ballistic circuitry ensures real-time needle movement reflecting dynamic power output.
Technical Specifications
| Feature / Metric |
Specification |
| Output Power (per channel) |
350 W @ 8Ω / 700 W @ 4Ω / 1,400 W @ 2Ω |
| Frequency Response |
1 Hz – 80 kHz (-1 dB) / 20 Hz – 20 kHz (±0.01 dB) |
| Distortion (THD) |
0.015% @ 1 kHz @ 350 W into 8Ω |
| Signal-to-Noise Ratio |
>105 dB (unweighted) / >75 dB (A-weighted) |
| Class A Range |
Up to 45 Watts |
| Input Impedance |
100 kΩ |
| Output Impedance |
0.1 Ω |
| Inputs / Outputs |
1 Pair Balanced XLR Inputs / 1 Pair Custom Heavy-Duty Binding Posts |
| Dimensions (W x H x D) |
17.875 x 9.0 x 23.0 in / 45.4 x 23.0 x 58.4 cm |
| Weight |
115 lbs / 52.2 kg |
| Finishes Available |
Anodized Silver, Stealth Black, or Custom Finishes |
Experience Progression S350 at Trimira Audio
Connect with the audio experts at Trimira Audio to explore component matching, assess speaker pairing options, or schedule a private audition of the Dan D'Agostino Progression S350 Stereo Amplifier.
