CT Sounds 4 Inch Coaxial Car Speakers 160W Pair

CT Sounds BIO-4-COX are compact 4-inch coaxial car speakers designed to replace factory units and deliver clearer mids, tighter bass, and crisp highs in a space-saving package.

These CT Sounds BIO-4-COX speakers offer a two-way coaxial design in a small 4" frame, suitable for many factory speaker locations. Each speaker handles 40 watts RMS (80W peak), giving the pair a combined 80W RMS (160W peak) power capability. The silk-dome tweeter married to a polypropylene woofer aims to produce balanced tonal response for vocals and instruments without requiring a large enclosure or heavy power. Installation hardware and pre-crimped wiring are included to streamline swapping out factory speakers.

How will these 4" speakers improve everyday driving sound?

Replacing worn or thin-sounding factory speakers with the BIO-4-COX restores clarity and adds punch to your car’s audio. The silk-dome tweeter enhances high frequencies while the polypropylene woofer provides controlled low end, so vocals and instruments come through cleaner at moderate volumes. They’re tuned for balanced response rather than extreme bass, making them ideal for radio, podcasts, and mixed playlists.

• Two-way coaxial layout improves treble detail and midrange clarity.
• Polypropylene woofer offers durable, controlled bass response.
• Suitable for factory head units or small amps without extra processing.

Will these speakers work with my car’s stock stereo or an aftermarket amp?

The BIO-4-COX speakers are 4 ohm impedance and 40W RMS each, so they run directly off most factory head units without risk of overpowering the unit. If you want louder, cleaner output, a multichannel amplifier rated to match the speakers’ RMS will give better headroom and lower distortion. Wiring and connectors are included to simplify either direct swap or amp integration.

• 4 ohm impedance compatible with most head units and amps.
• 40W RMS per speaker — can be driven by factory or aftermarket sources.
• Includes pre-crimped female spade connectors and wiring for easy hook-up.

What’s included and how easy is installation?

Each pair ships with everything needed for a straightforward replacement in common 4" mounting locations. CT Sounds provides two signature grilles to protect the cones, mounting screws and clips, and a printed manual with wiring diagrams to guide the swap. No custom adapters are necessary in many vehicles, but check your mounting depth and hole pattern before ordering.

• Includes (2) 4" grilles, (2) speaker wires with pre-crimped connectors.
• Comes with (8) 1" mounting screws and (8) mounting clips for secure fitment.
• Printed manual with wiring diagrams for faster installation and correct polarity.

How do design choices affect sound and durability?

The silk-dome tweeter delivers smooth highs without harshness, while the polypropylene woofer balances stiffness and damping for reliable low-frequency response. The coaxial format keeps the driver footprint compact—useful for tight factory locations—while material choices resist humidity and temperature swings found inside vehicles. These elements prioritize balanced tonal presentation and long-term stability over extreme SPL performance.

• Silk-dome tweeter for natural-sounding treble.
• Polypropylene woofer resists moisture and maintains shape under heat.
• Compact coaxial form factor fits small factory openings.

Who is this for? The CT Sounds BIO-4-COX 4" coaxial speakers are aimed at drivers replacing aging or weak factory speakers who want a clear, balanced upgrade without modifying speaker locations or adding large amplifiers. They suit everyday commuters, enthusiasts restoring a vehicle’s stock locations, and anyone seeking improved vocal and midrange clarity in compact installations.