Infinity Primus 603F 6.5″ (160mm) 2-Way Coaxial Car Speaker 50W RMS / 150W Peak / Harman Signature

The Infinity Primus 603F coaxial speaker system brings signature HARMAN sound quality and award-winning design to your vehicle. Engineered specifically for seamless factory-location upgrades, the Primus 603F delivers rich mid-bass and extended highs across both front and rear door cavities.

1. Plus One™ Polypropylene Woofer Cones

Infinity’s patented Plus One™ cone architecture increases the effective surface area of the woofer cone compared to standard speakers in its class. Pushing more air allows the driver to produce punchier mid-bass response and higher acoustic efficiency.

2. Edge-Driven Silk Dome Tweeters

Featuring an integrated edge-driven silk dome tweeter, the Primus 603F handles high frequencies with high precision and smooth tonal balance, avoiding the metallic harshness common in standard speakers.

3. High-Efficiency Output Architecture

Designed for high sensitivity, the Primus 603F extracts clear, dynamic sound even when powered directly by stock factory radios or low-power aftermarket head units.

4. Concealed OEM Factory Fitment

Manufactured without external grilles, the Primus 603F is proportioned to drop cleanly behind OEM factory door cards, rear deck covers, or panel cutouts.

PRODUCT SPECIFICATION INDEX

WHY COAXIAL SPEAKERS ARE RECOMMENDED FOR REAR DOORS

• All-in-One Full-Range Sound: Coaxial speakers integrate both the woofer and tweeter into a single driver unit. This delivers full-range sound (mid-bass, vocals, and treble) from a single mounting hole without needing separate tweeter cutouts in rear doors.

• Ideal Complement to Front Component Sets: Pairing a front component set (like the Primus 603CF) with rear coaxial speakers (like the Primus 603F) creates a complete, balanced 360-degree cabin soundstage for all passengers.

• Fast & Direct OEM Fitment: Without external crossover boxes or separate tweeter leads to route, coaxial drivers install cleanly and quickly into standard factory door cavities.

STEP-BY-STEP INSTALLATION GUIDE

1. Door Panel Disassembly: Using plastic trim removal tools, carefully unclip interior door trim covers, remove panel screws, disconnect switch harnesses, and lift off the door card.

2. OEM Speaker Removal: Unbolt or drill out the original factory speaker driver, disconnect the wiring plug, and clean the mounting cavity inside the door.

3. Adapter Bracket Setup: Fasten a custom 6.5-inch adapter ring onto the metal door frame. Apply foam damping tape between the ring and metal panel to prevent air leaks and panel rattles.

4. Wiring Integration: Connect the vehicle’s speaker leads directly to the Primus 603F terminals using proper solder or heat-shrink crimp connectors.

5. Speaker Driver Mounting: Align and screw the Infinity Primus 603F driver into the adapter ring inside the door cavity.

6. Testing & Reassembly: Test signal balance and volume playback from the head unit. Once verified, align and press the door panel back into place, securing all factory clips and screws.

WHY CHOOSE AYON MOTORS?

1. 100% Authentic HARMAN Stock: Genuine products verified with official serial numbers and original security packaging.

2. OEM Plug-and-Play Adapter Rings: Custom vehicle-specific speaker rings that mount perfectly into factory bolt locations—zero body cutting or structural alteration required.

3. 100% Pure Copper Wiring: Ultra-low resistance high-purity copper wiring for maximum power transfer, clean conductivity, and long-term signal integrity without corrosion.

4. Professional Cable Clipping & Wire Management: All wiring is secured cleanly with industrial cable clips and tie-mounts to prevent panel rattling, loose movement, or long-term wire fatigue inside door cavities.

5. OEM-Grade Harness Cloth Taping: Wiring looms are wrapped in automotive TESA cloth tape to absorb noise/vibrations, protect against friction wear, and provide a clean factory look.

6. Precision Cabin Audio Tuning: Fine-tuned equalizer and soundstage balance tailored specifically to your vehicle’s interior acoustic layout.