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Infinity Primus 9004A 4-Channel Amplifier
MRP: €239.88 Offer Price: €167.99
Power your complete car audio system with the Infinity Primus 9004A—a compact, high-performance 4-channel amplifier that delivers clean, dynamic sound. With 90 W RMS × 4 @ 4 Ω, flexible crossovers, and a selectable bass boost, it’s designed for car audio enthusiasts who demand clarity, power, and reliability from a trusted brand.
Description
Key Specifications
| Spec | Detail |
|---|---|
| Model | Infinity Primus 9004A (4 channels) elite-electronics.com.au+3infinity-caraudio.com.au+3fasmoto.com+3 |
| RMS Power Output | 90 W × 4 channels at 4 ohms infinity-caraudio.com.au+2fasmoto.com+2 |
| Power at 2 Ohms | 110 W × 4 channels at 2 ohms fasmoto.com+1 |
| Bridged Output (4 channels bridged to 2) | 220 W × 2 bridged at 4 ohms fasmoto.com+1 |
| Peak Power | ~ 880 W (advertised peak) fasmoto.com+2infinity-caraudio.com.au+2 |
| Frequency Response | 20 Hz – 20 kHz (±1 dB) infinity-caraudio.com.au+2fasmoto.com+2 |
| Total Harmonic Distortion + Noise (at rated power) | < 1% over that band infinity-caraudio.com.au+1 |
| Input Sensitivity |
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Line-level input: ~0.2 V – 5.0 V infinity-caraudio.com.au+1
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High-level input (speaker-level): ~0.5 V – 15 V infinity-caraudio.com.au+2fasmoto.com+2 |
| Crossovers / Filters | -
Variable High-Pass Filters (HPF): 32 Hz – 320 Hz infinity-caraudio.com.au+1
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Variable Low-Pass Filters (LPF): also 32 Hz – 320 Hz infinity-caraudio.com.au+1 |
| Bass EQ | Switchable bass boost at 45 Hz, 6 dB or 12 dB options infinity-caraudio.com.au+2fasmoto.com+2 |
| Protection Features | On-board protection: over-temperature (OTP), over/under voltage (OVP / UVP), over-current (OCP), short-circuit etc. infinity-caraudio.com.au+1 |
| Operating Voltage | 9 – 16 V DC (automotive standard) infinity-caraudio.com.au+1 |
| Signal-to-Noise Ratio | > 75 dB (line-in, REF to 1 W) fasmoto.com+1 |
| Quiescent Current Draw (Idle) | < ~1.5 A fasmoto.com+1 |
| Fuse / Power Wiring Requirements | Fuse size: 2 × 20 A (two fuses) in listings; wiring gauge should match current demands. infinity-caraudio.com.au+2fasmoto.com+2 |
| Physical Dimensions & Weight | Approx: 50.6 mm (H) × 145 mm (W) × 268.6 mm (L); weight ~ 1.806 kg fasmoto.com+1 |
Features & Design Highlights
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Compact footprint for a 4-channel amp of this power class, making it easier to mount in limited space. infinity-caraudio.com.au+1
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Bass EQ switchable (45 Hz, 6 dB or 12 dB), which helps with low-end reinforcement especially if speakers are unable to handle deep bass. infinity-caraudio.com.au+1
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Variable crossovers (HPF & LPF) allow you to tailor frequencies to what your speakers or subwoofers need, reducing distortion and improving clarity. infinity-caraudio.com.au+1
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Full onboard protection circuits ensure safety in real-world use — protecting against overheating, voltage issues, etc. infinity-caraudio.com.au+1
What to Expect in Real-World Use
Strengths
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Good all-rounder for driving a full set of speakers (front + rear) in a car with decent power. The 90 W × 4 (4 ohm) is strong for most door speakers and coaxial sets.
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When bridged, you can get 220 W to two channels for a more powerful setup (e.g. front mids, or small subwoofer), as long as the amp is properly set up and the load is safe.
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Bass boost at 45 Hz can help compensate for speaker/vehicle limitations (doors not sealed, etc.) and give more punch without needing a separate subwoofer (though a sub will still outperform in deep bass).
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Good options for tuning: filter knobs and input sensitivity let you match with both after-market head units and factory (weak) sources.
Limitations / What to Be Careful Of
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Although 90 W × 4 is good, pushing it hard (especially at 2 ohm) will stress both the amp and your power supply (battery, alternator) and wiring. Overheating or voltage sag can degrade performance.
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Peak power rating (880 W) is marketing-oriented; sustained output is what matters and will be closer to RMS ratings. Don’t expect “880W” continuous.
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Deep bass performance (below ~30 Hz) will depend heavily on your speakers / enclosure / subwoofer; this amp alone won’t produce very deep bass unless paired with able subs.
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Because of its size and power, good ventilation and solid installation are important. Poor airflow / loose mounting will reduce reliability.
1 review for Infinity Primus 9004A 4-Channel Amplifier
Infinity Primus 9004A 4-Channel Amplifier
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Switchable bass boost is a lifesaver for low-end punch without overpowering mids.