The Momentum S250 to S250 MxV Upgrade offers existing owners of the Dan D'Agostino Momentum S250 Stereo Amplifier a factory-authorized pathway to current Momentum S250 MxV performance levels. Coordinated through Trimira Audio, Brisbane’s destination for ultra-high-end audio, this upgrade replaces all internal signal and power circuitry while retaining the iconic, precision-machined aluminum and copper chassis.
Named after the physics formula for momentum ($M \times V$, or Mass times Velocity), the MxV designation integrates circuit design breakthroughs directly trickle-down from the flagship Relentless Monoblocks.
Key Features & Technological Innovations
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2,200 VA Linear Transformer with Advanced Winding: Incorporates a re-engineered 2,200 VA ultra-quiet transformer that reduces hysteresis losses by 90% and delivers over 50% more current output within the same footprint.
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Nearly 100,000 µF Reservoir: Feeds a high-speed capacitor bank of nearly 100,000 µF, ensuring massive instantaneous power reserves for dynamic orchestral peaks and low-frequency control.
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Relentless-Derived Input & Output Stages: Features front-end bipolar transistors delivering ten times the current capability of previous designs, coupled with 28 ultra-fast 69 MHz output transistors originally engineered for the Relentless Series.
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Fully Complementary Driver Section: Utilizes discrete transistors for positive and negative signal halves, doubling the current drive fed to the output stage and doubling open-loop gain for a more open, transparent, and authoritative soundstage.
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Zero-Global-Feedback Architecture: Maintains D'Agostino's direct-coupled, fully balanced topology to eliminate signal phase distortion and deliver unmatched sonic purity.
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Preserved Chassis Aesthetics: Retains the existing chassis and 250W scale dual-needle analog power meter.
Technical Specifications & Upgrade Comparison
| Feature / Metric |
Momentum S250 |
Momentum S250 MxV |
| Output Power @ 8Ω (per ch) |
250 W RMS |
250 W RMS |
| Output Power @ 4Ω (per ch) |
500 W RMS |
500 W RMS |
| Output Power @ 2Ω (per ch) |
1,000 W RMS |
1,000 W RMS |
| Main Transformer |
1,800 VA Linear Transformer |
2,200 VA Ultra-Quiet Transformer (+50% Current Output) |
| Power Supply Capacitance |
Standard Capacitance Bank |
~100,000 µF High-Speed Bank |
| Output Stage Devices |
69 MHz Power Transistors |
28 High-Output 69 MHz Relentless-Spec Devices |
| Meter Plate |
250W Scale Meter |
Retained 250W Scale Meter |
| Frequency Response |
1 Hz – 200 kHz (-1 dB) |
1 Hz – 200 kHz (-1 dB) / 20 Hz – 20 kHz (±0.1 dB) |
| Signal-to-Noise Ratio |
>105 dB (unweighted) |
>105 dB (unweighted) / >75 dB (A-weighted) |
Schedule Your S250 MxV Upgrade with Trimira Audio
Contact the team at Trimira Audio to confirm your Momentum S250 serial number, discuss upgrade pricing, and arrange factory service logistics.
