Matrix Audio MA-1 Flagship Class AB Power Amplifier

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 Class 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 (<10 mA); Output DC 12V (≤50 mA) Inputs: XLR balanced and RCA unbalanced (switchable, not simultaneous) Chassis: H-frame CNC-machined aluminum, M Series circular perforation array design Dimensions (W × D × H): 430 × 518 × 201 mm Weight: 42.4 kg Warranty: 1 year manufacturer warranty

Why Buy From All Elite Audio

All Elite Audio is an authorized Matrix Audio dealer located in Timonium, Maryland — part of the greater Baltimore area. We carry the complete Matrix Audio M Series including the MA-1 power amplifier, the MP-1 preamplifier, and the MS-1 flagship streamer/DAC. Our team has hands-on experience with the complete M Series system and can advise on system configuration, gain matching with the MP-1, bridged mono configuration with dual MA-1 units, and speaker pairing.

We offer white-glove service, in-store demos, and support before and after your purchase. Whether you are local to Maryland or ordering nationwide, we are here to help you get the most from your system.

Call: 443-402-5055 Text: 443-402-5064 Visit: 1921 York Rd, Timonium, MD 21093

Frequently Asked Questions — Matrix Audio MA-1

What is the Matrix Audio MA-1 and what makes it distinctive? The Matrix Audio MA-1 is Matrix Audio's first power amplifier — a fully independent dual-mono Class AB design delivering 250 watts per channel into 8 ohms, built as the power amplification component of the M Series flagship reference system alongside the MP-1 preamplifier and MS-1 streamer/DAC. It uses ten ON Semiconductor high-power transistors per channel in a high-bias push-pull output stage, dual independent 1,250 VA total toroidal power supplies with 190,000µF of total filter capacitance, a damping factor of approximately 350, and MCU-controlled active cooling with dual thermal sensors. At $8,999 it is designed for listeners who want a dedicated, purpose-built power amplifier at the top of the Matrix Audio lineup.

What is the MA-1's output power and what loads can it drive? In standard stereo mode the MA-1 delivers 250 watts per channel into 8 ohms and 450 watts per channel into 4 ohms. In bridged mono mode — where both channels drive a single speaker — it delivers 500 watts into 8 ohms and up to 900 watts into 4 ohms. Speaker impedance compatibility in stereo and mono mode spans 2 to 16 ohms; in bridged mode the minimum load is 4 ohms. The MA-1 is designed to drive demanding, low-sensitivity, or low-impedance loudspeakers that require both high voltage swing and high current delivery.

Why does the MA-1 use 10 transistors per channel instead of fewer higher-powered ones? Using ten transistors in parallel per channel rather than fewer higher-rated devices produces a significantly lower combined output impedance — the parallel combination of ten transistors produces roughly one-tenth the output impedance of a single transistor. Lower output impedance translates directly to a higher damping factor, which means tighter control over the speaker's voice coil, better bass definition, and less influence from the speaker's back-EMF on the amplifier's output. The parallel arrangement also distributes thermal dissipation across more devices, reducing the thermal stress on each individual transistor and contributing to long-term reliability.

Why does the MA-1 consume 250–300 watts at idle? The MA-1's idle power consumption reflects its high-bias Class AB operating point. A higher bias current keeps the output transistors conducting further into Class A operation — the fully linear part of their operating range — before the push-pull transition occurs. This is the design choice that gives the MA-1 its character: lower distortion, better linearity, and a more natural transient response at normal listening levels, at the cost of higher idle power draw and heat generation. The thermal management system is sized to handle this continuous dissipation passively during normal use.

How does bridged mono mode work on the MA-1? In bridged mono mode, both channels of a single MA-1 are combined to drive a single loudspeaker. One channel drives the positive terminal of the speaker with the normal signal, and the other drives the negative terminal with the inverted signal. This doubles the available voltage swing across the speaker, effectively quadrupling the power into the same load compared to a single channel — hence the jump from 250W stereo to 500W bridged into 8 ohms. The minimum load impedance in bridged mode is 4 ohms, because each individual channel sees the load impedance multiplied by two (a 4-ohm speaker in bridge means each channel drives an effective 8-ohm load). Bridged mode requires connecting the speaker differently and selecting bridge mode on the amplifier.

Can two MA-1 amplifiers be used together? Yes, in two configurations. Two MA-1 units can each be run in bridged mono mode to create a monoblock pair — each amplifier dedicated to one channel — delivering 500W per channel into 8 ohms or 900W per channel into 4 ohms. Alternatively, two MA-1 units can be used for active bi-amping, with one amplifier driving the high-frequency section of each speaker and the other driving the low-frequency section, in combination with the MP-1 preamplifier's dual XLR output pairs which can be individually volume-controlled.

What is the gain switch for and how do I choose the right setting? The gain switch on the MA-1's rear panel selects between +30 dB standard gain and +24 dB reduced gain. The correct setting depends on the output level of the connected preamplifier. If the MP-1 preamplifier reaches the desired listening volume with very little volume control travel, the +24 dB setting brings the gain down to use more of the preamplifier's range. If the preamplifier needs to be turned up high to reach listening level, the +30 dB setting provides more sensitivity. In the M Series context with the MP-1, the gain setting is calibrated as part of the initial system setup. Both settings deliver identical measured performance except for the slight SNR advantage at +30 dB due to higher input sensitivity.

How does the MA-1's thermal management work? The MA-1 uses a combination of large passive heatsinks and an MCU-controlled 7.4-inch fan. Two thermal sensors mounted directly on the main heatsink continuously sample temperature and report to the MCU. At normal listening levels the heatsinks handle thermal dissipation passively and the fan remains inactive or at its lowest speed — the amplifier is essentially inaudible in operation. As power demand or ambient temperature rises and the heatsink temperature exceeds the MCU's threshold, the fan engages and its speed is dynamically adjusted in proportion to the thermal demand. The fan's airflow path is designed to cool the heatsinks without directing air across the signal-path components.

How does the MA-1 fit into the Matrix Audio M Series system? The M Series comprises three purpose-built components: the MS-1 music streamer/DAC, the MP-1 preamplifier, and the MA-1 power amplifier. In the standard configuration the MS-1 provides the source and digital conversion, the MP-1 handles volume control and input switching via its relay-stepped resistor attenuator, and the MA-1 provides power amplification to the loudspeakers. The 12V trigger chain links all three components for one-button system power management. All three share the same H-frame chassis geometry, M Series circular perforation design, and square copper wire power supply topology.

What warranty does the Matrix Audio MA-1 include? The Matrix Audio MA-1 carries a one-year manufacturer warranty. All Elite Audio is a fully authorized Matrix Audio dealer, ensuring your warranty is valid and supported.

Where can I buy the Matrix Audio MA-1 and hear it in person? All Elite Audio is an authorized Matrix Audio dealer with a full home audio showroom located at 1921 York Rd, Timonium, Maryland 21093. We carry the complete Matrix Audio M Series and can demonstrate the MA-1 as part of a full reference system. Call us at 443-402-5055 or text 443-402-5064. We also ship nationwide.