The Momentum M300 to M400 MxV Upgrade allows owners of original Dan D'Agostino Momentum Monaural Amplifiers to elevate their system to current Momentum M400 MxV performance levels. Facilitated through Trimira Audio, Brisbane’s destination for ultra-high-end audio, this factory-authorized retrofit completely overhauls the internal circuitry while preserving the iconic copper-and-aluminum chassis architecture.
Representing Mass times Velocity ($M \times V$), the MxV designation integrates groundbreaking circuit design techniques originally developed for the flagship Relentless Series. This upgrade increases power output to a staggering 400 Watts into 8 Ohms and delivers dramatic improvements in dynamic speed, low-frequency authority, and open-loop gain.
Key Features & Technological Innovations
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Power Delivery Boosted to 400W @ 8Ω: Increases rated output from 300 Watts to 400 Watts into 8 Ohms (doubling linearly to 800W into 4 Ohms and 1,600W into 2 Ohms), providing virtually limitless dynamic headroom.
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Next-Generation Linear Transformers: Replaces original power transformers with a new, ultra-quiet linear power transformer featuring an improved winding scheme. This yields over 50% more current output from the same transformer footprint while reducing hysteresis losses by 90%.
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Expanded Reservoir Power Supply: Boosts power supply capacitance to a massive nearly 100,000 µF bank, stabilizing energy delivery during intense dynamic shifts.
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Relentless-Derived Input & Output Stages: Introduces wider-bandwidth input JFETs and 28 high-speed 69 MHz output transistors (sourced from the Relentless Series), drastically lowering distortion across all frequencies.
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Fully Complementary Driver Section: Incorporates individual transistors for positive and negative signal halves, doubling the current drive required to maximize the output stage and doubling open-loop gain.
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400-Watt Meter Face Replacement: Retains original chassis metalwork while updating the front analog power meter faceplate with a brand-new 400W scale meter plate reflecting the increase in power.
Technical Specifications & Upgrade Comparison
| Feature / Metric |
Momentum M300 |
Momentum M400 MxV |
| Output Power @ 8Ω |
300 W RMS |
400 W RMS |
| Output Power @ 4Ω |
600 W RMS |
800 W RMS |
| Output Power @ 2Ω |
1,200 W RMS |
1,600 W RMS |
| Transformer Output |
Standard Linear Transformer |
Ultra-Quiet High-Current Linear Transformer (+50% current) |
| Power Supply Capacitance |
~70,000 µF Bank |
~100,000 µF High-Speed Bank |
| Output Stage Transistors |
Standard High-Speed Transistors |
28 High-Output 69 MHz Relentless-Spec Transistors |
| Meter Display |
300W Scale Meter Faceplate |
Updated 400W Scale Meter Faceplate |
| 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) |
>115 dB (unweighted) / >85 dB (A-weighted) |
Arrange Your Momentum MxV Upgrade with Trimira Audio
Contact the high-end audio specialists at Trimira Audio to discuss eligibility for your Momentum M300 monoblocks, inquire about turn-around schedules, and coordinate factory service logistics.
