Infinity PRIMUS 3000A 300W x 1 Amplifier: Designed To Deliver Infinity's Signature Sound In More Vehicles
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 subwooers 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.
Infinity PRIMUS3000A Features:
Value EngineeredPrimus amplifier provides true Infinity performance at an affordable price while now lacking the features needed to properely tune and optimize performance.
Compact FootprintWith 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 ProtectionPrimus amplifier has on-board circuitry to protect them from shorts, temperature, overvoltage and undervoltage. An LED indicator is inlcuded on all four models to let you know when one of these conditions exists.
ReliabilityInfinity is one of the best selling car audio brands in the world. This is not a coincidence given the arduous testing and quality control. We take our crat seriously and want every consumer to have a world class experience that lasts and lasts.
Input SensitivityAn input level control adjusts input sensitivity. When low level nputs are used, this control can adjust the input between 200mVrms and 6.0Vrms. When high level inputs are used, the control adjusts the input between 0.5Vrms and 15Vrms. This allows Primus amps to be conntected to virtually any factory system or serve as the foundation for a trophy winning aftermarket competition system.
Switchable Bass EQThis 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 DesignBlack with grooved center panel, polished badge, black painted end panels and bottom.
What's in the Box:
1x Amplifier
1x Spare Fuse (x2 for 1-channel and 4-channel model)
1x Quick start guide
1x High-level input cable (x2 for 4-channel model).
1x Mounting hardware
1x Mounting screws
Legendary Products & Support From Authorized Dealers
When you choose Infinity, you're choosing quality and performance. But just as important as what you buy is where you buy it from. Here's why purchasing from an authorized dealer is always the right choice:
▸ Expert Knowledge & Training
Only authorized Infinity dealers are factory-trained to sell and install our products. They have the expertise to ensure your purchase is set up correctly and meets your expectations.
▸ Authorized Warranty Protection:
We offer one of the best warranties in the industry, but only purchases made through authorized dealers are covered. Don't be misled by unauthorized sellers who can't provide genuine warranty support.
▸ Reliable Customer Support:
If you ever run into an issue, you're backed by Infinity's official manufacturer's warranty. No need to deal with overseas returns—our local team takes care of everything quickly and efficiently.
▸ Protect Your Investment:
Buying from an authorized dealer ensures you're getting genuine products, full warranty coverage, and expert support. Ask yourself—is saving a few dollars worth losing all that?
Choose wisely. Buy from an authorized Infinity dealer today!
Small footprint. Serious bass. BRT efficiency for bikes, ATVs, and hybrid vehicles.
Product Overview
The Rockford Fosgate PBR300X1 is a 300W mono subwoofer amplifier from the Punch series, built specifically for vehicles where space and electrical load are genuine constraints. Unlike conventional car amplifiers that rely on a switching power supply, the PBR300X1 uses Rockford Fosgate's proprietary BRT (Boosted Rail Technology) an ultra-efficient design that generates 300W of output without the inefficiencies and electrical noise associated with a traditional switching supply.
The result is an amplifier that draws significantly less current from the vehicle's electrical system, making it an ideal choice for motorcycles, ATVs, and hybrid-electric vehicles where alternator capacity and mounting space are limited. The ultra-compact chassis fits into locations where a conventional amplifier simply won't. A variable hi-level DC offset turn-on circuit (4–6V) allows plug-and-play integration with OEM and factory speaker outputs no dedicated remote turn-on wire required in most motorcycle and recreational vehicle installations. A built-in 12dB/octave Butterworth crossover filters the signal before it reaches your subwoofer, and high-level inputs accept signal directly from factory speaker outputs.
Key Specifications
Channels: 1 (mono)
Output power: 300W (impedance breakdown — not specified by supplier)
Power supply technology: BRT (Boosted Rail Technology — no switching power supply)
Output stage: MOSFET
Crossover: 12dB/octave Butterworth (frequency range — not specified)
Signal input: High level
Turn-on method: Variable hi-level DC offset (4–6V)
Chassis: Ultra-compact
Frequency response: Not specified
Input sensitivity: Not specified
Nominal impedance: Not specified
CEA compliance: Not specified in provided data
Dimensions: Not specified
Power wire gauge: Not specified
Recommended fuse: Not specified
Features & Benefits
BRT (Boosted Rail Technology) — No Switching Power Supply — Conventional amplifiers use a switching power supply to step up battery voltage before amplification. BRT bypasses this stage entirely, achieving 300W of output through a fundamentally different electrical architecture. This reduces current draw, lowers electrical noise, and shrinks the chassis — critical for motorcycles and hybrid vehicles where alternator output and installation space are tightly constrained.
Ultra-Compact Chassis — The PBR300X1 is specifically engineered for installations where a standard amplifier will not physically fit. Saddlebag runs, under-seat motorcycle mounts, ATV storage compartments, and tight boot builds are all viable locations. Exact dimensions are not specified in supplier-provided data — confirm with Rockford Fosgate before planning the install.
Variable Hi-Level DC Offset Turn-On (4–6V) — Many motorcycle and OEM audio systems do not provide a standard 12V remote turn-on output. The PBR300X1 includes a variable DC offset turn-on circuit that detects a 4–6V signal on the speaker outputs and powers the amplifier accordingly — eliminating the need to source and run a dedicated remote wire in most factory and recreational vehicle installations.
High-Level Inputs — Accepts signal directly from the speaker outputs of a factory head unit or OEM radio. No line output converter or aftermarket head unit is required for integration — particularly useful in motorcycle and ATV builds where changing the source unit may not be practical.
MOSFET Output Stage — The MOSFET output stage delivers efficient, low-distortion power to the subwoofer load and contributes to the overall compact, low-heat design of the PBR300X1. MOSFET designs are well regarded for reliability under the variable voltage and vibration conditions common in motorcycle and off-road vehicle environments.
12dB/Octave Butterworth Low-Pass Crossover — The on-board Butterworth crossover filters out midrange and high frequencies before they reach the subwoofer. A 12dB/octave slope provides a smooth, musical roll-off well-suited to subwoofer applications. Crossover frequency range is not specified in provided data — confirm with Rockford Fosgate.
Technical Specs
Specification
Detail
Channels
1 (mono)
Output power
300W total rated
Power by impedance
Not specified
Power supply
BRT — no switching power supply
Output stage
MOSFET
Circuit topology
Not specified
Frequency response
Not specified
Input sensitivity
Not specified
THD+Noise
Not specified
Nominal impedance
Not specified
Crossover type
12dB/octave Butterworth
Crossover frequency range
Not specified
Signal input
High level
Turn-on method
Variable hi-level DC offset, 4–6V
Phase control
Not specified
CEA compliance
Not specified
Power wire gauge
Not specified
Speaker wire gauge
Not specified
Operating voltage
Not specified
Recommended fuse
Not specified
Dimensions
Not specified
Weight
1.25 kg
Compatible With / Goes Well With
The PBR300X1 is confirmed by the manufacturer for use in the following applications:
Motorcycles with factory or aftermarket subwoofer systems
ATVs and off-road recreational vehicles
Hybrid-electric vehicles with limited alternator capacity
Recreational vehicles requiring a compact subwoofer amplifier
OEM/factory audio systems (via high-level DC offset turn-on)
Goes well with:
Compact or shallow-mount subwoofers suited to motorcycle and ATV enclosures
Rockford Fosgate Punch series compact subwoofer drivers
Factory head units and OEM audio systems (high-level input compatible)
Frequently Asked Questions
What is BRT (Boosted Rail Technology) and why does it matter?
BRT is Rockford Fosgate's proprietary amplifier architecture that produces 300W of output without a conventional switching power supply. This reduces current draw, minimises electrical noise, and allows a significantly smaller chassis — making it practical for motorcycles, ATVs, and hybrid vehicles.
Will the PBR300X1 work on a motorcycle or ATV?
Yes. The PBR300X1 is specifically designed for motorcycles, ATVs, and other recreational vehicles where electrical capacity and mounting space are limited. The BRT design keeps current draw low and the chassis small enough for tight installation locations.
What is the variable DC offset turn-on circuit?
Many motorcycles and OEM systems don't have a dedicated remote turn-on output. The PBR300X1 detects a 4–6V DC offset on the speaker inputs and uses this signal to power up the amplifier automatically — simplifying installation in factory and recreational vehicle audio systems.
Does the PBR300X1 include a built-in crossover?
Yes. A 12dB/octave Butterworth low-pass crossover is built in, filtering the signal to suit subwoofer use. The adjustable frequency range is not confirmed in supplier-provided data — contact Rockford Fosgate for details before purchase.
Can the PBR300X1 accept signal from a factory head unit?
Yes. High-level inputs allow direct connection to factory speaker outputs, making integration with OEM systems and motorcycle radios straightforward without the need for a separate line output converter.
Legendary Products & Support From Authorized Dealers
When you choose Frankies BrandBeast, you're choosing quality and performance. But just as important as what you buy is where you buy it from. Here's why purchasing from an authorized dealer is always the right choice:
▸ Expert Knowledge & TrainingOnly authorized Frankies BrandBeast dealers are factory-trained to sell and install our products. They have the expertise to ensure your purchase is set up correctly and meets your expectations.
▸ Authorized Warranty ProtectionWe offer one of the best warranties in the industry, but only purchases made through authorized dealers are covered. Don’t be misled by unauthorized sellers who can’t provide genuine warranty support.
▸ Reliable Customer SupportIf you ever run into an issue, you’re backed by Frankies BrandBeast’s official manufacturer’s warranty. No need to deal with overseas returns—our local team takes care of everything quickly and efficiently.
▸ Protect Your InvestmentBuying from an authorized dealer ensures you’re getting genuine products, full warranty coverage, and expert support. Ask yourself—is saving a few bucks worth losing all that?
Choose wisely. Buy from Frankies BrandBeast today!
The Fusion Signature Series Marine Amplifiers Are Purpose-Built for the Marine EnvironmentBoasting some of the most impressive environmental protection available, they deliver a Signature performance on the water like never before.Introducing one of our most stunning and efficient marine amplifiers, the SG-DA12250. Its True-Marine design will resist corrosion, and the incredible 2250 Watt peak power is configurable for 1 Ohm impedance - delivering enough power to bring your Signature Series subwoofer components to life.The SG-DA12250 has a highly efficient monoblock Class-D amplifier design. The key benefit of a Class-D amplifier is that it has a low battery drain with high output, making this the perfect amplifier for the marine environment. The SG-DA12250 also has conformal coated PCBs for maximum product life and performance, plus the amplifier chassis is a heat sink, to reduce component core temperature and increase efficiency.Undeniably a stand-out piece, the stunning stainless steel mirror control panel cover conceals and protects all cable connections and setting controls, with an attractive finish to complement any installation.The zone 1 and 2 outputs include four speaker channels plus a subwoofer. RCA line-level inputs allow for easy connection to new or existing systems.This product is rated True-Marine and carries a 3-year limited consumer warranty.Features: Class-D Amplifier Technology - The highly efficient Class-D design provides 2250-Watts peak power whilst drawing less current than a standard Class-AB amplifier. This design provides increased efficiency and power output to your speakers, letting you enjoy your music for longer 2250 Watt peak power – Bring your music to life with 2250 Watts peak power Marine-Ready Design with Conformal Coated PCBs - Extending the life of your amplifiers, the Signature Series are designed specifically for marine use with conformal coated PCBs to provide extra protection from the marine elements Rigid Aluminum Alloy Heat Sink - Molded to form a singular die-cast chassis, the fin layout is calculated with precision to increase the surface area of the heat sink and improve heat dissipation Stainless Mirror Finish - The polished stainless-steel control panel cover conceals and protects all cable connections and settings controls whilst providing an attractive finish to complement any installation Zone Designation - To align with the Fusion entertainment system zone philosophy, the input and output connections are labelled as zones True-Marine Design - Signature Series amplifiers are perfect for the marine environment, and carry a 3-year warranty Specifications: Amplifier Class: Class-D Subwoofer Frequency Response: 10Hz - 320Hz Peak Power: 2250 Watts Rated Power (4 Ohms): 500 Watts RMS x 1 @ 14.4V - 4 Ohms 1% THD Rated Power (2 Ohms): 850 Watts RMS x 1 @ 14.4V - 2 Ohms 1% THD Rated Power (4 Ohms Bridged): 1100 Watts RMS x 1 @ 14.4V - 1 Ohm 1% THD Gift Box Dimension: (W) 379mm (14-15/16”) (H) 110mm (4-5/16”) (D) 268mm (10-9/16”) Height: 50mm [2”] Length: 300mm [11-13/16”] Depth: 210mm [8-1/4”]
Legendary Products & Support From Authorized Dealers
When you choose Fusion, you're choosing quality and performance. But just as important as what you buy is where you buy it from. Here's why purchasing from an authorized dealer is always the right choice:
▸ Expert Knowledge & Training
Only authorized Fusion dealers are factory-trained to sell and install our products. They have the expertise to ensure your purchase is set up correctly and meets your expectations.
▸ Authorized Warranty Protection:
We offer one of the best warranties in the industry, but only purchases made through authorized dealers are covered. Don't be misled by unauthorized sellers who can't provide genuine warranty support.
▸ Reliable Customer Support:
If you ever run into an issue, you're backed by Fusion's official manufacturer's warranty. No need to deal with overseas returns—our local team takes care of everything quickly and efficiently.
▸ Protect Your Investment:
Buying from an authorized dealer ensures you're getting genuine products, full warranty coverage, and expert support. Ask yourself—is saving a few dollars worth losing all that?
Choose wisely. Buy from an authorized Fusion dealer today!
