Sky High Car Audio C Series Full Range Speakers

Shop Sky High Car Audio C Series full range speakers for factory speaker replacement, daily-driver upgrades and complete car audio systems. The C Series includes coaxial speakers in several common round and oval sizes, making it easier to find an option for front doors, rear doors, dashboards, rear decks and custom speaker locations.

These speakers combine multiple frequency drivers into one speaker assembly, providing vocals, instruments and high-frequency detail without requiring separate midrange and tweeter mounting locations.

Available Sky High C Series Speaker Sizes

The Sky High Car Audio C Series includes several popular speaker sizes used throughout cars, trucks and SUVs:

  • 4-inch coaxial speakers for smaller dashboard, door, rear-panel and custom locations
  • 4x6 coaxial speakers for vehicles using compact oval factory openings
  • 5.25-inch coaxial speakers for smaller front-door, rear-door and side-panel locations
  • 5x7 coaxial speakers for vehicles equipped with oval factory speaker openings
  • 6.5-inch coaxial speakers for one of the most common front- and rear-door sizes
  • 6x9 coaxial speakers for larger door locations, rear decks and custom panels

Always verify the mounting depth, cutout diameter, basket shape, bolt pattern and grille clearance before ordering. A speaker’s advertised size does not guarantee direct fitment in every vehicle that lists the same nominal size.

C Series Two-Way, Three-Way and Four-Way Speakers

The C Series includes two-way, three-way and four-way coaxial speaker designs depending on the model and size.

A coaxial speaker places the high-frequency drivers in front of the main speaker cone so a wider portion of the music can be reproduced from one factory-style speaker location.

  • Two-way speakers combine a main cone with a high-frequency driver.
  • Three-way speakers add another driver section intended to divide more of the frequency range.
  • Four-way speakers use additional driver sections within the coaxial assembly.

The number of ways should not be used by itself to determine which speaker is best. Vehicle fitment, installation quality, speaker size, available power, crossover settings and the listener’s sound goals all matter.

Factory Speaker Replacement

Factory speakers can become worn, damaged or unable to provide the clarity and output needed after other parts of the audio system are upgraded. Sky High C Series speakers provide replacement options in several factory-style sizes without automatically requiring a complicated custom-door build.

A C Series speaker may make sense when:

  • A factory speaker is blown, distorted or damaged.
  • Vocals and musical detail sound weak or muffled.
  • A new aftermarket radio has been installed.
  • A subwoofer system is overpowering the original speakers.
  • The vehicle needs stronger front- or rear-speaker output.
  • You want broader sound from one speaker location.
  • Separate tweeter mounting is not practical.

Some vehicles use factory amplifiers, unusual speaker impedances or vehicle-specific equalization. Check the original system before replacing speakers or bypassing factory equipment.

Choosing the Correct C Series Speaker

Start with the factory speaker size, but do not stop there. Two speakers with the same advertised diameter can have different baskets, mounting depths and bolt patterns.

Check the following before ordering:

  • Factory speaker size
  • Available mounting depth
  • Speaker cutout diameter
  • Mounting-hole pattern
  • Window-track and door-mechanism clearance
  • Factory grille clearance
  • Speaker impedance
  • Radio or amplifier compatibility
  • Whether an adapter or spacer is required
  • Whether the product is sold individually or as a pair

4-Inch and 4x6 Speakers

Four-inch and 4x6 speakers are commonly used where available space is limited. These smaller speakers can improve vocals and musical detail, but they should not be expected to reproduce deep subwoofer frequencies.

Proper high-pass crossover protection is especially important for smaller speakers because excessive low-frequency movement can cause distortion or damage.

5.25-Inch and 5x7 Speakers

Five-and-a-quarter-inch and 5x7 speakers provide options for vehicles using medium-sized round or oval factory locations. They may be found in front doors, rear doors, quarter panels and rear interior panels depending on the vehicle.

6.5-Inch and 6x9 Speakers

Six-and-a-half-inch speakers are among the most common sizes used for aftermarket door-speaker upgrades. Six-by-nine speakers provide a larger oval format commonly found in doors, rear decks and custom panels.

The larger cone area can help create a fuller sound when the speaker is securely mounted and supplied with appropriate clean power.

Do Sky High C Series Speakers Need an Amplifier?

The correct power source depends on the exact speaker model, speaker impedance and desired output. Some C Series speakers may be used with compatible radio or factory-amplifier power, while an aftermarket amplifier can provide additional clean power and crossover control.

An amplifier becomes more useful when:

  • The speakers need to play louder than the radio can cleanly support.
  • A subwoofer system is overpowering the front and rear speakers.
  • Several speakers are being installed.
  • The system needs adjustable crossover and level control.
  • The vehicle is receiving a complete amplified audio upgrade.

Compare available Sky High Car Audio amplifiers for full range speakers when planning an amplified C Series system.

Use Proper Crossover Protection

Full range does not mean a door speaker should reproduce every frequency in the audio system. Deep bass should normally be handled by a properly installed subwoofer system.

A high-pass crossover can help reduce excessive cone movement, distortion and unnecessary stress on the C Series speakers. The correct setting depends on the exact speaker size, amplifier power, installation and desired listening level.

Smaller speakers generally need more protection from low frequencies than larger speakers. Begin with safe crossover settings and make careful adjustments instead of forcing deep bass from a speaker that was not designed to replace a subwoofer.

Speaker Mounting and Installation

A quality speaker can still sound weak when it is mounted to a loose, flexible or rattling panel. A stronger installation should include:

  • A secure speaker adapter or mounting surface
  • Proper mounting hardware
  • A good seal around the speaker
  • Correct positive and negative polarity
  • Safe wire routing
  • Protection from moisture inside the door
  • Enough clearance for the cone, grille and window mechanism
  • Door treatment where panels flex or rattle

Incorrect polarity can cause cancellation between speakers, resulting in weak center sound, reduced punch and uneven output between the left and right sides of the vehicle.

Shop All Full Range Speakers

Browse the complete full range car speaker collection to compare additional brands, sizes and speaker designs.

You can also view all Sky High Car Audio full range speakers to compare the C Series with other Sky High speaker series and options.

Complete the Speaker Installation

An amplified speaker installation may also require new speaker wire and supporting installation materials. Browse Sky High Car Audio wire and speaker wiring when the factory wire is damaged, undersized or unsuitable for the planned amplifier power.

Helpful Car Audio Speaker Guides

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