Infinity INFPRIMUS90041AAM 4-Channel Class D Car Amplifier

The Infinity Primus 90041A is a compact four-channel Class D car amplifier designed to add dedicated power to a vehicle audio system. It can drive front and rear speakers from four channels or be bridged for a two-channel setup. With 90 watts RMS per channel at 4 ohms, it is suited to replacing head-unit power with a more capable amplified speaker system.

This amplifier is a practical fit for listeners upgrading factory or aftermarket speakers who want more output and tuning control without relying on a large amplifier chassis. Its high-level and low-level input sensitivity ranges support integration with a broad range of source units. OEM load-detect compatibility further supports use with factory radio systems that require a speaker load.

At 4 ohms, the Primus 90041A delivers 90 watts RMS to each of four channels; at 2 ohms, it delivers 130 watts RMS per channel. For systems that need more power on fewer channels, it can be bridged to provide 260 watts RMS x 2 at 4 ohms. The full-range frequency response is rated from 20Hz to 20kHz, ±1dB.

System tuning is handled with selectable high-pass, low-pass, and full-range crossover modes for each channel pair. The variable crossover range spans 32Hz to 320Hz with a 12dB-per-octave slope. A variable bass EQ centered at 45Hz provides 0 to 12dB of adjustment when system tuning calls for added low-frequency emphasis.

The Primus 90041A is built for modern vehicle installations, including vehicles with start/stop systems. Its compact footprint helps provide more mounting flexibility in confined vehicle spaces. Integrated DCP, OVP, UVP, OCP, and OTP protection circuits are designed to help safeguard the amplifier during abnormal operating conditions.

Key Features

• Four-Channel Class D Design: Supplies dedicated power for a front-and-rear speaker system or a bridged two-channel configuration.
• 90W RMS Per Channel: Delivers rated full-range power into four 4-ohm speaker channels.
• Bridgeable Output: Combines channel pairs for 260W RMS x 2 at 4 ohms.
• Variable Crossovers: Lets you set high-pass or low-pass filtering from 32Hz to 320Hz.
• High- And Low-Level Inputs: Supports connection to compatible factory or aftermarket audio sources.
• Integrated Protection Circuitry: Monitors for DC, voltage, current, and temperature-related fault conditions.

Design & Installation

The Primus 90041A has a compact black amplifier body with a smooth curved profile, angular end-cap styling, and an Infinity logo treatment. Its Class D architecture supports a compact installation-oriented form factor. On-board adjustment controls provide access to input gain, crossover selection, crossover frequency, and bass EQ settings.

Use this amplifier with compatible 2-ohm or 4-ohm speaker loads, observing the 4-ohm minimum requirement when bridging channel pairs. High-level input cables are included for compatible speaker-level connections, while low-level input sensitivity supports compatible preamp-level sources. Professional installation is recommended for power, ground, speaker, signal, and fuse wiring, as well as gain and crossover setup.