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HomeShopEntertainmentCar AmplifiersINFINITY Primus 9004A 4 CHANNEL AMPLIFIER, 880W PEAK, 90W RMS X 4 @ 4 OHMS



If you want to improve the sound in your vehicle to a great level, Infinity’s Primus 9004A 4–channel amplifier may be just what you’re looking for. This little powerhouse will send 90 watts RMS to each of your front and rear speakers, adding the detail and punch that a car stereo just can’t muster. Or, you could power your front pair of speakers with the front two channels, then power a subwoofer with up to 220 watts RMS from the rear channels in bridged mode. It works in almost any vehicle.

SKU: B4-18 Category:


INFINITY Primus 9004A 4 Channel Amplifier


Infinity Primus Amps are available in a variety of configurations, delivering the right power and number of channels for full-range and subwoofer applications. For more than four decades, Infinity has made the audio experience a lot more satisfying for the car audio enthusiast. With a broad array of loudspeakers, amplifiers and subwoofers available, you can drive with ease and exhilaration. These compact amps are equipped with all the important inputs and user controls including a bass EQ as well as LPF and HPF crossover controls for tailoring sound to suit the characteristics of different vehicles. The Primus Amps are easily installed and amazingly reliable and once they turn on, they’ll make a transducer sit up and sing.

Speaker-level inputs allow this amplifier to work with almost any system, which is handy if you’re keeping your factory radio. Separate high- and low-pass filters help the amp do its job, whether it’s driving speakers or a subwoofer. You can use the built-in bass boost to add more low-frequency fun.


Value Engineered: Primus amplifier provides true Infinity performance at an affordable price while now lacking the features needed to properly tune and optimize performance.

Compact footprint: With it becoming more and more difficult to find spacious locations for amplifier mounting, Primus has been developed in a small compact form factor to allow more location versatility.

Full On-Board Protection: Primus amplifier has on-board circuitry to protect them from shorts, temperature, overvoltage and under-voltage. An LED indicator is included on all four models to let you know when one of these conditions exists.

Reliability: Infinity is one of the bestselling car audio brands in the world. This is not a coincidence given the arduous testing and quality control. We take our craft seriously and want every consumer to have a world-class experience that lasts and lasts.

Input Sensitivity: An input level control adjusts input sensitivity. When low-level inputs are used, this control can adjust the input between 200mVrms and 5.0Vrms. When high-level inputs are used, the control adjusts the input between 0.5Vrms and 15Vrms. This allows Primus amps to be connected to virtually any factory system or serve as the foundation for a trophy-winning aftermarket competition system.

Switchable bass EQ: This provides an available bass boost at 45Hz of 6dB or 12dB, serving as a great tool to optimize subwoofer and loudspeaker performance based on location and enclosure type.

Cool industrial design: Black with grooved centre panel, polished badge, black painted end panels and bottom.

Crossover mode switch: LPF crossover controls are switchable between 0dB to 12dB at 45Hz giving the user the ability to adjust the sound to the environment and/or application.

Crossover control gives the user additional fine-tuning: Adjusts the crossover turnover frequency between 32Hz and 320Hz. (One knob for each stereo pair.)

Additional information

Weight 1.8 kg
Dimensions 50.6 × 145 × 268.6 cm



Brand: Infinity

Model: Primus 9004A

Type: 4 Channel

Power Handling: 220 W RMS, 880 W Peak

Frequency Response: 20 – 20kHz

Fuse Rating: 2 x 20A

Dimensions: 50.6x145x268.6 mm

Weight: 1.806 kgs

What’s in the Box?

  • Amplifier
  • Spare Fuse (x2 for 1-channel and 4-channel model)
  • Quick start guide
  • High-level input cable (x2 for 4-channel model)
  • Mounting hardware
  • Mounting screws

Warranty & Installation

Warranty: Sony provides 1 year warranty (12 months)

Installation: We recommend getting the installation of the speakers done by a skilled professional.
Razen Customs does provide Doorstep Installation by expert technicians for the seat covers for orders within Hyderabad currently. The installation option can be chosen during the checkout process.


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