Matrix Audio MA-1 Flagship Class AB Power Amplifier

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Matrix Audio MA-1 Flagship Class AB Power Amplifier Matrix Audio's first power amplifier — and a statement about what one should be. The Matrix Audio MA-1 is Matrix Audio's first C lass AB power amplifier and the final link in the M Series reference chain. It delivers 250 watts per channel into 8 ohms and 450 watts per channel into 4 ohms from a fully independent dual-mono architecture: two separate toroidal transformers, two separate power supply banks, and two completely isolated channel circuits that share nothing except the chassis. Ten ON Semiconductor high-power transistors per channel in a push-pull configuration operating at high bias current lower the output impedance, tighten speaker control, and keep the amp firmly in Class AB's most linear operating range even at elevated power levels. A 1,250 VA total supply capacity, 190,000µF of filter capacitance, ±80V rails, and a damping factor of approximately 350 give the MA-1 the reserve and grip to handle any loudspeaker load without strain. This is not a product that runs out of power before the music does. Available now at All Elite Audio, your authorized Matrix Audio dealer in Timonium, Maryland — with in-store demos, expert guidance, and nationwide shipping. Class AB at High Bias — The Design Philosophy The MA-1 is Matrix Audio's first power amplifier, and the decision to build it as a Class AB design at high bias current reflects a deliberate engineering philosophy. Pure Class A operation — where the output transistors conduct through the full audio cycle — produces the lowest distortion but generates enormous heat and consumes enormous power even at idle. Class D — used in many modern integrated amplifiers including the MD-1 and MD-1P — is highly efficient but introduces switching artifacts that require careful filtering. Class AB at high bias occupies the performance middle ground that most serious high-power amplifiers choose: the output transistors remain in Class A operation up through a significant portion of the MA-1's power range, transitioning to Class B mode only as demand increases. The static power consumption of up to 300 watts at idle — high for a stereo amplifier — reflects how far into Class A territory the MA-1's bias point extends. The practical result is an amplifier that combines the linearity and low-distortion character of Class A operation for normal listening levels with the headroom and efficiency of Class AB for dynamic peaks. 10 ON Semiconductor Transistors Per Channel in Push-Pull Configuration The MA-1 uses ten ON Semiconductor high-power transistors per channel arranged in a push-pull output stage. Using ten transistors in parallel per channel rather than fewer higher-rated transistors serves a specific purpose: lower output impedance. Each transistor in the parallel bank contributes its own output impedance in parallel with the others, and the combined output impedance of ten paralleled devices is a fraction of any individual transistor's output impedance. Lower output impedance translates directly to a higher damping factor — the MA-1 achieves approximately 350 at 8 ohms — which means tighter, more authoritative control over the speaker's voice coil movement, better bass definition, and reduced back-EMF influence from the speaker on the amplifier's output stage. The high bias current operating point keeps the transistors in their most linear region and provides fast, clean current delivery during transient demands. Each channel has its own separate power supply circuits for the input stage and the amplification stage independently, preventing the large current demands of the output stage from coupling noise into the sensitive low-level input circuits. Dual-Mono Power Supply — 1,250 VA, ±80V Rails, 190,000µF The MA-1's power supply is the foundation on which everything else rests, and it is built without compromise. Two independent toroidal transformers — one per channel — provide a total of 1,250 VA of transformer capacity. Each channel's transformer feeds its own dedicated rectification and filtering stage with ±80V DC rails. Each channel is equipped with 14 filter capacitors of 6,800µF each, connected in parallel rather than using fewer larger-value capacitors. The parallel connection serves a critical purpose: multiple capacitors in parallel produce a lower combined equivalent series resistance (ESR) than any single capacitor of the same total capacitance. Lower ESR means the power supply can deliver large current transients more rapidly and with less voltage sag — exactly what a power amplifier needs during the sharp leading edges of musical transients. The total filter capacitance across both channels reaches 190,000µF — a figure that reflects the scale of power reserve the MA-1 carries. The main power rail voltage of ±80V provides the headroom for the MA-1's rated output power with generous margin. The power supply compartment is physically isolated from the audio circuits within the chassis. Bridged Mono Mode — 500W Into 8 Ohms, 900W Into 4 Ohms The MA-1 supports a bridged mono operating mode in which the two channels of a single amplifier are combined to drive a single loudspeaker, effectively doubling the available voltage swing and delivering 500 watts into 8 ohms or up to 900 watts into 4 ohms. In bridged mode the minimum speaker impedance rises to 4 ohms — the two channels share the current delivery burden, and each channel sees twice the load impedance, so 4-ohm minimum bridged corresponds to each channel driving an 8-ohm load. Bridged mode is appropriate for very high power requirements with efficient speakers or for monoblock configurations where two MA-1 units are used, one per channel, in full bridged mono for maximum output. Two MA-1 amplifiers can also be used in a four-channel bi-amping configuration by connecting both channels of each amplifier to the high- and low-frequency sections of the loudspeaker separately, in combination with the MP-1's dual XLR output pairs. Selectable Gain — +30 dB and +24 dB The MA-1 provides two selectable gain settings via a rear-panel switch: the standard +30 dB gain for typical preamplifier output levels, and a reduced +24 dB setting for preamplifiers or sources with higher output voltages. The gain switch allows the MA-1 to be optimally matched to different preamplifiers without introducing attenuation noise in the signal path. In the context of the M Series system, the MP-1 preamplifier's output level and the chosen gain setting on the MA-1 are calibrated together at the point of system setup to achieve the preferred volume control range and noise floor. Both gain settings maintain the MA-1's measured performance specifications — the SNR actually improves slightly at +30 dB gain due to the higher input sensitivity. Thermal Management — MCU-Controlled Fan With Dual Heatsink Sensors The MA-1 uses a combination of passive heatsinking and active fan cooling managed by a dedicated MCU. Two thermal sensors are permanently mounted on the main heatsink, continuously sampling temperature. The MCU monitors both sensors and dynamically adjusts the speed of the 7.4-inch fan in response to actual thermal load — the fan does not run at a fixed speed or simply toggle on and off. At normal listening levels the MA-1's large heatsinks handle thermal dissipation passively and the fan remains inactive or runs at its lowest speed, making the amplifier essentially inaudible in operation. As power demand increases and the heatsink temperature rises above the MCU's threshold, the fan engages and accelerates proportionally. The fan's airflow path is designed to cool the heatsinks without directing air over the sensitive signal-path components, keeping thermal management separate from the audio circuitry. H-Frame Chassis Architecture The MA-1's chassis uses Matrix Audio's H-frame structure — a mechanical architecture developed specifically for the M Series over two years of iterative design work, optimizing the relationship between mechanical rigidity, circuit module placement, heat dissipation, and the external aesthetic of the M Series design language. The H-frame provides a solid and stable foundation for the amplifier's considerable mass (42.4 kg) and creates separate internal compartments that physically isolate the power supply section, the input circuits, and the output stages from each other. Each component surface undergoes multiple stages of CNC machining and surface treatment to achieve the matte texture characteristic of M Series products. The MA-1's chassis shares the circular perforation array aesthetic and dimensional footprint with the MS-1 and MP-1, forming a visually unified M Series reference stack. Key Specifications Amplifier Type: Class AB, push-pull, dual mono Output Power (Stereo): 250W x 2 at 8 ohms; 450W x 2 at 4 ohms Output Power (Bridged Mono): 500W at 8 ohms; 900W at 4 ohms Transistors: 10 ON Semiconductor high-power transistors per channel, parallel push-pull Gain Settings: +30 dB (standard); +24 dB (attenuated, rear-panel switch) Input Sensitivity: 1.48 Vrms (stereo/mono mode); 1.0 Vrms (bridged mode) Input Impedance: 40 kΩ (XLR); 20 kΩ (RCA) Frequency Response: 20 Hz – 20 kHz +0/–0.15 dB; –3 dB at 160 kHz THD+N: Less than 0.02% at 250W into 8 ohms (stereo/mono); less than 0.06% at 500W into 8 ohms (bridged) SNR: Approximately 119 dB A-weighted at +24 dB gain; approximately 123 dB at +30 dB gain Crosstalk: Greater than 120 dB Damping Factor: Approximately 350 at 8 ohms, 1 kHz Speaker Load: 2–16 ohms (stereo/mono); 4–16 ohms (bridged) Power Supply: Dual independent toroidal transformers; 1,250 VA total; ±80V rails; 14 × 6,800µF per channel; 190,000µF total; independent PSU for input and output stages per channel Thermal Management: Passive heatsinking + MCU-controlled 7.4-inch fan with dual heatsink sensors; dynamic speed control Idle Power Consumption: Approximately 250–300W Maximum Power Consumption: Less than 1,250W Standby Power: Less than 1W Trigger: Input DC 6–12V ( Show more