The Momentum M400 to M400 MxV Upgrade provides owners of Dan D'Agostino Momentum M400 Monaural Amplifiers with a direct factory upgrade path to current MxV flagship performance standards. Facilitated through Trimira Audio, Brisbane’s premier high-end audio destination, this factory-authorized enhancement implements advanced circuitry originally created for the flagship Relentless Series.
Since the Momentum M400 chassis already features the 400-Watt power rating and 400W scale meter faceplate, this focused upgrade updates all internal circuit assemblies including input, driver, and output stages—to achieve the Mass times Velocity ( M x V) standard.
Key Features & Technological Innovations
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Ultra-Wide Bandwidth Input Stage: Re-architects the front-end input circuit with advanced complementary bipolar transistors that deliver ten times the current and power capability of prior components. This extends both high and low frequency response while substantially reducing distortion.
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Increased Power Supply Capacitance: Boosts local energy storage to a high-speed bank of nearly 100,000 µF, ensuring instantaneous dynamic response and effortless power delivery under heavy dynamic transients.
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Relentless-Derived Driver & Output Stages: Employs ultra-fast 69 MHz output transistors originally developed for the Relentless Monoblock. Coupled with a new bias stability circuit that increases operating Class A bias by nearly 50%, the amplifier delivers greater warmth, texture, and low-frequency authority.
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Doubled Open-Loop Gain: Fully complementary driver topology uses individual devices for positive and negative signal halves, doubling current drive to the output stage and doubling open-loop gain for a more expansive soundstage.
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New Meter Driver Circuitry: Upgrades internal meter circuitry to track the increased dynamic capability and transient speed with absolute precision.
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Preserves Original Chassis Metalwork: Executes all electrical updates internally, retaining the iconic solid-aluminum chassis, copper venturi heat sinks, and front faceplate.
Technical Specifications & Upgrade Comparison
| Feature / Metric |
Momentum M400 |
Momentum M400 MxV |
| Power Output @ 8Ω |
400 W RMS |
400 W RMS |
| Power Output @ 4Ω |
800 W RMS |
800 W RMS |
| Power Output @ 2Ω |
1,600 W RMS |
1,600 W RMS |
| Input Stage Topology |
Standard Complementary Discrete |
Ultra-Wide Bandwidth Bipolar Input Circuit (10x Current Capability) |
| Driver / Output Transistors |
Standard High-Speed Devices |
Relentless-Spec 69 MHz High-Output Transistors |
| Class A Operating Bias |
Standard Bias Circuit |
+50% Class A Operating Bias Level |
| 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) |
Arrange Your M400 MxV Upgrade with Trimira Audio
Contact the high-end audio team at Trimira Audio to verify serial number eligibility for your Momentum M400 monoblocks, receive scheduling timelines, and arrange factory service logistics.
