Infinity Alpha 603C 720W 6.5" Component Car Speakers - Pair
Infinity Alpha 603C 720W 6.5" Component Car Speakers - Pair
(INFINITY ALPHA603C)
We Think You Should Know
- 12 Month Australian Warranty
- Purchase Guarantee (see T&C's)
- Infinity Alpha 603C - 4 Ohm
- 165mm Woofer
- 90W RMS / 720W peak
- 2-way component system
- 90dB sensitivity for clear output
- 142mm Mounting Diameter
- 55.4mm Mounting Depth
- Frequency: 55Hz - 20kHz
Overview
The Infinity Alpha 603C 6.5" Component Car Speakers deliver precise, live-performance acoustics across standard vehicle passenger cabins. Drivers install this high-end 6.5-inch component split set to bring iconic audiophile clarity straight to their factory mounting locations. The high-sensitivity motor layout extracts breathtaking high-resolution detail and impactful mid-bass slam without requiring a mandatory amplifier overhaul.
Key Features:
- Separate Edge-Driven Silk Dome Tweeters – Upgraded with premium edge-driven silk dome high-frequency tweeters that separate upper-tier notes cleanly away from the footwells. This specialized engineering yields a broader, smoother high-frequency range that remains natural and free from metal fatigue.
- Robust Outboard Frequency Passive Crossovers – Outfitted with independent external crossover networks. These modules filter your audio signal cleanly, allocating deep low frequencies to the 16.5 cm woofers while feeding crisp high notes into the tweeters to optimise structural linearity.
- Heavy Duty 720 Watt Dynamic Peak Capability – Built to handle abrupt musical transitions and dense sound tracking effortlessly. Delivering a commanding 90 Watts RMS continuous power and scaling to an explosive 720 Watts peak, this split set adds serious dynamic depth to your cabin.
- All Weather Automotive Composite Construction – Engineered using dense, rugged composite materials designed explicitly to brave the brutal conditions of car cabins. This structural framing reliably withstands severe temperature fluctuations, dampness, and continuous road vibrations.
- Advanced Sound Staging Component Design – Take advantage of an architecture that lets you mount the woofers inside doors and place the separate tweeters up on your dashboard or A-pillars. This separation builds a vastly wider soundstage, raising vocals straight up to ear level.
- Universal Modular Drop In Integration – Skip tedious body metal cutting or custom door reconstruction. Packing a highly optimised, low-profile chassis outline alongside complete, comprehensive mounting hardware, these 6.5" splits drop quickly into standard factory door voids.
Ideal For
- Car audio hobbyists wanting to shift away from restrictive, flat coaxial designs into an elite split component array with superior acoustic imaging
- DIY car audio customisers looking for direct drop-in replacement 6.5-inch component systems that fit standard door openings without cutting
- Daily commuters seeking lifelike vocal presence, clear string definitions, and punchy, tight mid-bass tracking that cuts cleanly over highway tyre hum
- Value-conscious builders seeking a high-output, heavily stress-tested component audio package that runs efficiently on factory head units
Infinity Car Audio
Since their beginnings in 1968 Infinity Loud Speakers have been renowned for producing some of the best home and car audio speaker systems money could buy and the latest Kappa Series of speakers is no different. Infinity holds many US patents for their speaker designs and technologies from their Plus One cone technologies and true 4-ohm topology through to their exclusive Intermount, I-Mount and Starfish speaker mounting systems. Infinity is truly one of a few genuine speaker brands and a brand we have no hesitation in recommending should you have not heard of them before.
| Specifications | Details |
|---|---|
| Product Type | 6.5" (165mm) Two-Way Component Split Car Speaker System |
| SKU / Model Number | ALPHA603C (Manufacturer No. 1200130019883) |
| Continuous Power Handling | 90W RMS Continuous Output (Per Speaker Array) |
| Maximum Peak Power Output | 720W Peak Power Capacity (Per Speaker Array) |
| System Acoustic Sensitivity | 90dB Maximum Noise Efficiency Rating (@ 2.83V) |
| Frequency Response Profile | 55Hz – 20,000Hz (20kHz) Full-Range Component Output |
| Nominal Impedance Loop | 4.0 ohms Standard Vehicle Electrical Compatibility |
| Woofer Cone Architecture | 16.50 cm Rigid Composite Weather-Resistant Cone |
| Tweeter Configuration | Separate High-Resolution Edge-Driven Silk Dome Tweeter Pair |
| Crossover Architecture | Dedicated Outboard Audio Frequency Distribution Networks |
- 2 x Infinity Alpha 6.5-Inch (165mm) High-Performance Mid-Bass Woofers
- 2 x Separate High-Resolution Edge-Driven Silk Dome Tweeters
- 2 x Dedicated Outboard Signal Distribution Passive Crossover Modules
- 2 x High-Density Anti-Resonant Isolation Foam Gaskets
- 1 x Comprehensive Set of Automotive Door Structural Installation Fasteners
- 1 x Complete Multi-Piece Tweeter Flush and Surface Mount Hardware Kit
- 1 x Detailed Step-by-Step Installation Setup and Configuration Manual
Peace of Mind Purchase Guarantee & Declaration of Warranty
This product is directly imported and is offered with a full Australian 12 month warranty. (You may also be entitled to other consumer warranties as provided by the Australian Consumer Guarantee and these entitlements are not limited by this warranty). In the event that this product should fail please contact our service department to arrange service for this product.
We are not linked or associated with Infinity.
This product will be shipped from our Sydney Warehouse and you are welcome to pick it up directly from our store in Sydney. This product is NOT DROP SHIPPED from overseas.
Disclaimer
Due to differing operating costs associated with selling products via different marketplaces, our pricing may vary.

The information below is required for social login
Sign In
Create New Account