Car audio troubleshooting & gear
Fix it right. Hear it clear.
Sound Driven gives you real answers to real car audio problems — whining amps, dead head units, muddy bass — plus a hand-picked catalog of gear to fix it. Run by Greg Dean, for people who want it done right the first time.
Quick diagnosis
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From the shop
Gear We Trust
Example data shown for layout.
6.5" Component Speaker Set
Crisp mids and highs with a silk-dome tweeter — a clean upgrade over stock door speakers.
$149.99
1200W Mono Amplifier
Class D mono block built for a single subwoofer — clean power without cooking your electrical system.
$219.00
12" Loaded Subwoofer Box
Ported enclosure with a 12-inch sub pre-mounted — drop it in the trunk and wire it up.
$259.50
Straight answers
Expert Advice
Greg's field notes on the problems that come through the shop door every week.
Example data shown for layout.
Alternator Whine Through the Speakers
That rising-and-falling whine is almost always ground loop noise picked up by your RCA cables or a bad ground point on the amplifier. Start by running a dedicated ground wire straight to bare metal on the chassis, then check that your RCA cables aren't routed alongside the factory wiring harness. If it persists, a ground loop isolator on the RCA line usually clears it up.
Speakers Cutting Out at High Volume
This is a classic sign of an underpowered amp or a speaker being pushed past its RMS rating. Check your amp's gain setting first — it's often set too high from the factory or a rushed install. Back the gain down using a multimeter and the amp's rated output. If the speakers are old, they may simply be worn out and ready for replacement.
Head Unit Won't Power On
Nine times out of ten this is a blown fuse — check both the in-line fuse on the wiring harness and your vehicle's fuse box. If the fuse is good, verify you have 12V at the yellow (constant) and red (accessory) wires with a multimeter. No power on either wire usually points to a loose connection at the harness adapter.
Subwoofer Sounds Muddy or Boomy
A boomy sub is usually an enclosure or tuning problem, not a speaker problem. If it's a ported box, confirm the port length matches the sub's specs — even an inch off changes the tuning noticeably. Also check your amp's low-pass filter; setting it too high lets midrange frequencies through and muddies the bass. Try 80Hz as a starting point.
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