Description
Four channels. One serious upgrade.
Product Overview
The Infinity REF3004A is a full-featured 4 channel car amplifier built for Aussie drivers who want real, usable power without filling the boot with gear. Delivering 75W RMS per channel at 4 ohms or 200W RMS per channel in 2-channel bridged mode this amplifier is versatile enough to run front and rear speakers today and transition to subwoofer duty when you're ready to add a dedicated sub amp down the track.
Designed to slot into virtually any system, the REF3004A features both preamp and speaker-level inputs, so it works just as well in a factory-stereo setup as it does with an aftermarket headunit. Independent high and low-pass filters on the front and rear channels let you dial in your sound properly no guesswork, no compromise.
Key Specifications
- 75W RMS x 4 channels at 4 ohms
- 100W RMS x 4 channels at 2 ohms
- 200W RMS x 2 channels at 4 ohms (bridged mode)
- 4-ohm stable in bridged configuration
- Variable high-pass and low-pass filters: 32–320Hz, 12dB/octave
- Filters operate independently on front and rear channels
- Preamp and speaker-level inputs included
- Preamp outputs for daisy-chaining additional amplifiers
- Fuse rating: 30A x 2 (two 30A fuses)
- Recommended power and ground lead: 8-gauge
- Wiring and hardware not included
Features & Benefits
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Flexible power modes: Run four speakers at 75W RMS each for a full-system build, or bridge to 2-channel at 200W RMS to power a pair of subwoofers. One amp, multiple system configurations.
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Speaker-level inputs: Connects directly to factory headunit speaker outputs, making this ideal for Aussie utes, SUVs, and 4WDs that still have the OEM head unit in place.
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Independent variable filters: Separate high and low-pass filters on front and rear channels (32–320Hz, 12dB/octave) mean you're not locked into a one-size-fits-all crossover point. Dial in your door speakers and dash separately.
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Preamp outputs: Future-proof your system. Add a dedicated sub amp or processor later without rewiring the whole install.
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Compact form factor: At 320 x 180mm footprint, it tucks neatly under a seat or into a tight boot space a practical win on wagons, dual-cabs, and touring builds.
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Dual 30A fuse protection: Built-in protection helps safeguard your system on corrugated outback roads and long touring runs where electrical stability matters.
Technical Specs
- Channels: 4 (stereo) / 2 (bridged)
- RMS Power (4Ω, 4ch): 75W x 4
- RMS Power (2Ω, 4ch): 100W x 4
- RMS Power (4Ω, bridged): 200W x 2
- Bridged impedance stability: 4 ohms minimum
- High-pass filter range: 32–320Hz, 12dB/octave
- Low-pass filter range: 32–320Hz, 12dB/octave
- Filter assignment: Independent front and rear channels
- Inputs: Preamp (RCA) + Speaker-level
- Outputs: Preamp (RCA)
- Fuse: 30A x 2
- Recommended power/ground wire gauge: 8 AWG (8-gauge)
- Dimensions (W x H x D): 320mm x 55.5mm x 180mm
- Wiring kit: Not included
Compatible With
- Any vehicle with factory or aftermarket headunit (speaker-level inputs allow OEM compatibility)
- Suitable for passenger cars, utes, SUVs, wagons, and 4WDs
- Pairs well with Infinity Reference Series component or coaxial speakers
- Works with 4-ohm or 2-ohm speaker loads (4-channel mode)
- Compatible with 4-ohm subwoofers in bridged mode
- Recommended to pair with a dedicated 8-gauge amplifier wiring kit (sold separately)
- Can be paired with a separate mono subwoofer amplifier using the preamp outputs
Frequently Asked Questions
Does the REF3004A work with a factory (OEM) headunit? Yes. The built-in speaker-level inputs allow you to connect this amplifier directly to the factory headunit's speaker outputs no RCA outputs required on the source unit.
Can I use this amp to power subwoofers? Yes. In bridged 2-channel mode, the REF3004A delivers 200W RMS per channel at 4 ohms, making it capable of driving a pair of 4-ohm subwoofers. Note: bridged mode requires a 4-ohm minimum load.
Do I need a separate wiring kit? Yes. Wiring and hardware are not included. Infinity recommends 8-gauge power and ground leads. A quality 8-gauge amplifier wiring kit is required for correct and safe installation.
What is the physical size of the REF3004A? The amplifier measures 320mm wide x 55.5mm high x 180mm deep compact enough to fit under most seats or in a standard boot install alongside other gear.
Can I add another amplifier using the preamp outputs? Yes. The REF3004A includes preamp (RCA) outputs, allowing you to pass signal to a second amplifier such as a dedicated mono sub amp without the need for an additional signal splitter.
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 & Training
Only 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.
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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.
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Buying 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?
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