What size are the rear speakers in a 2008 Chevy Cobalt?
The typical rear deck speakers in a 2008 Chevy Cobalt measure 6x9 inches in size.
This article details where those sizes come from, notes variations by body style and trim, and explains how to verify the exact dimensions for your car or when planning an upgrade.
What sizes to expect across the 2008 Cobalt lineup
In most 2008 Cobalt configurations, the rear deck behind the back seat houses 6x9 inch speakers. Some trims or configurations—particularly certain base models or rear-door setups—may use smaller 4x6 inch speakers in the rear doors rather than the rear deck. When planning a replacement, it’s important to know which mounting location your car uses.
- Rear deck speakers: typically 6x9 inches (approximately 152x228 mm)
- Rear-door speakers (in some trims): often 4x6 inches (approximately 102x152 mm)
- Common impedance: usually 4 ohms
- Estimated mounting depth: roughly 2.5 to 4 inches, depending on the exact model and location
Knowing where your speakers sit and their approximate size helps prevent mis-orders when shopping for replacements or upgrades.
How to verify the exact size in your vehicle
To confirm the precise size for your particular car, you can measure the mounting opening or consult official diagrams. Here are practical steps to verify the size yourself.
- Remove the appropriate panel (rear deck cover or rear door panel) to expose the speaker mounting area and measure the opening or magnet diameter.
- Check the vehicle’s user manual, service manual, or GM parts diagrams for the 2008 Cobalt to identify the specified speaker size by model year and body style.
- Look for markings on the original speaker itself (often stamped with size like “6x9” or “4x6”).
- When ordering replacements, specify the exact year, body style (sedan or coupe), and any trim differences to ensure compatibility.
Accurate verification reduces the risk of ordering the wrong size and makes aftermarket upgrades smoother.
Upgrade considerations and options
If you’re upgrading the factory speakers, consider how the size and mounting location affect your choices. Here are common pathways and what to watch for.
- 6x9 inch rear deck replacements for improved midbass and overall clarity, if your car uses rear deck speakers
- 4x6 inch replacements for rear-door setups, when applicable, ensuring mounting depth fits
- Ensure impedance compatibility (4 ohms is typical) with your head unit or any aftermarket amplifier
- Check mounting depth and brackets; some installations require adapters to fit in the factory openings
Pairing the right size with appropriate mounting hardware and an impedance-compatible amplifier or head unit will maximize sound quality without fit issues.
Summary
For most 2008 Chevy Cobalts, rear deck speakers are 6x9 inches, with some trims potentially using 4x6 inch units in rear doors. Always verify by measuring the opening or consulting service diagrams for your exact body style and trim, especially if you’re upgrading. With the right size confirmed, you can choose appropriate aftermarket options to improve the car’s rear sound performance.
