INFINITY ALPHA 603C - New Gen Alpha Series 6.5″ 2-Way Component Speaker System

INFINITY ALPHA 603C | 6.5″ 2-Way Component Speaker System | 90 W RMS | 90 dB SPL

The Infinity Alpha 603C is a precision-engineered 6.5″ two-way component speaker system designed for clean, dynamic sound in upgraded car audio installations. Featuring Infinity’s exclusive Plus One™ woofer cone architecture and a smooth, edge-driven silk dome tweeter, this set delivers extended bass and crisp, detailed highs—ideal for front-stage clarity in both OEM replacements and custom systems. With high power handling of 90 W RMS (720 W peak) and a wide frequency response, the Alpha 603C offers impactful performance even at higher volumes, while its 4 Ω nominal impedance ensures compatibility with a wide range of aftermarket amplifiers and head units.

The component design separates the mid-woofer and tweeter, allowing optimal placement for superior imaging and staging. Paired with Infinity’s competitively tuned sound signature, the Alpha 603C is purpose-built for discerning listeners seeking a more refined, musical experience—without the premium price tag. Rugged, stylish, and engineered with Infinity’s new ID design language, this system is a perfect match for enthusiasts who demand more than factory sound.

Tech Specs

Model: Infinity Alpha 603C

Type: 2-Way Component Speaker System

Woofer: 6-1/2″ (165mm) Plus One™ woofer cone

Tweeter: Edge-driven silk dome tweeter

Power: 90 W RMS, 720 W peak

Sensitivity: 90 dB (@2.83V)

Impedance: 4 Ω nominal

Frequency Response: 60 Hz – 20 kHz

Applications: Front-stage upgrade for OEM or aftermarket audio systems; ideal for amplified or high-power head units

Key Highlights

Plus One™ Cone Technology: Patented woofer design provides more cone surface area than standard speakers for deeper bass and improved efficiency.

Edge-Driven Silk Dome Tweeter: Unlike common w-dome tweeters, the Alpha 603C's silk dome is edge-driven for smoother frequency response and cleaner highs at all volume levels.

New Infinity ID Design: Updated aesthetics and materials appeal to audio enthusiasts looking for modern styling with acoustic performance.

Competitively Tuned: Tuned against class competitors to ensure balanced output and a consistent Infinity sonic signature.

Value Engineered: Designed to deliver Infinity sound at an affordable price, without compromising on materials or quality.