{"product_id":"dan-dagostino-momentum-s250-mxv-stereo-amplifier","title":"Dan D'Agostino Momentum S250 MxV Stereo Amplifier","description":"\u003cp\u003e\u003cspan\u003eDelivering the extraordinary sound quality of the Momentum M400 MxV Monoblock, the Momentum S250 MxV Stereo Amplifier features techniques and topologies developed and implemented in the Relentless Series. This fullest expression of the Momentum circuitry is reflected in the model’s name, MxV. Those with a physics background will recognize that MxV, or Mass times Velocity, is the equation for Momentum.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eEvery major section of the amplifier—power supply, input, driver, and output stages—has been enhanced. An improved transformer winding provides over 50% more current output from the same transformer footprint, offering greater headroom during dynamic passages. The input stage combines revised circuit topology with advanced components feeding the driver and output stages. Crucial to the new circuit are bipolar transistors powering the front end that deliver ten times the current and power of the originals. These wider bandwidth, higher-power components extend low- and high-frequency performance with reduced distortion at both frequency extremes. \u003c\/p\u003e\n\u003cp\u003eEnergizing the driver stage is a bias stability circuit providing a nearly 50% increase in operating bias. Increasing Class A operation directly correlates to better sound quality. However, there is a limit to bias level in any amplifier. With this new circuit topology and our unique copper heatsinks, thermal issues are not a practical concern, preventing excessive temperatures even under the greatest demand. Additional power transistors in the output stage reduce workload foreach device, so the entire output section works more efficiently. The result is a richer, more dynamic, and intimate presentation of the music. \u003c\/p\u003e\n\u003cp\u003eThe final output stage features 28 new high-output transistors originally sourced for the flagship Relentless Series amplifiers. Among the fastest available, these run at a blistering 69 MHz and permit the amplifier to achieve incredible bandwidth. Each transistor mounts with two stainless steel fasteners—a rarity among flat-package transistors—for maximum thermal transfer to the copper heatsinks. A capacitor\/resistor network connected to the base of each transistor ensures stability even at high frequencies and with low-impedance speakers. Additionally, every output transistor is measured, and only devices that match the required performance specifications are used. As with all D’Agostino models, the Momentum S250 MxV Stereo Amplifier features discrete, direct-coupled balanced circuitry, the most accurate circuit platform possible.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePower: 250W per channel into 8 ohms, 500W into 4 ohms, 1,000W into 2 ohms\u003c\/li\u003e\n\u003cli\u003eFrequency response: 1 Hz to 200 kHz, -1 dB; 20 Hz to 20 kHz, +\/- 0.1 dB\u003c\/li\u003e\n\u003cli\u003eTHD: 0.1% at 1 kHz, 250W per channel into 8 ohms\u003c\/li\u003e\n\u003cli\u003eSignal to noise: better than 75 dB A weighted, better than 105 dB unweighted\u003c\/li\u003e\n\u003cli\u003eGain: 27 dB\u003c\/li\u003e\n\u003cli\u003eInput impedance: 100k ohms\u003c\/li\u003e\n\u003cli\u003eOutput impedance: under 0.07 ohms, 20 Hz to 20 kHz\u003c\/li\u003e\n\u003cli\u003eOutput current: 120A peak\u003c\/li\u003e\n\u003cli\u003eDimensions: 12.5 x 5.25 x 21.5 in\u003c\/li\u003e\n\u003cli\u003eWeight: 95 lbs\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Dan D'Agostino","offers":[{"title":"Default Title","offer_id":53142141763901,"sku":"DAG-MOM-S250","price":50000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1021\/5741\/8813\/files\/SilverS250Front-0.png?v=1790308469","url":"https:\/\/audio-concepts.com\/products\/dan-dagostino-momentum-s250-mxv-stereo-amplifier","provider":"AudioConcepts","version":"1.0","type":"link"}