🔊 Car Audio Help

Sub Not Hitting? We Fix It. Free.

Amp in protect mode? No bass? Building a box? Free step-by-step fixes, wiring help and calculators that actually work.

🔇 Fix No Bass Ω Wiring Calculator 📦 Box Calculator

🛠️ Fix It

What’s Wrong With Your Sub?

🔇 No bass at all

Step-by-step checklist: power, fuses, settings, cables and wiring.

🚨 Amp in protect mode

Find the cause: bad ground, short, low impedance or heat.

💥 Is my sub blown?

Quick tests to tell if your sub is dead or just disconnected.

📉 Weak or distorted bass

Rattles, distortion, cutting out and other common problems.

🩺 Full diagnostic

Not sure where to start? Walk through every check in order.

🔌 Multimeter basics

Test voltage, fuses, grounds and sub impedance yourself.

🧮 Free Calculators

Calculators That Actually Work

📦 Box volume

Net internal volume from your box dimensions.

🌀 Port length

Port length for your box size and tuning.

Ω Impedance

Every final ohm load for 1–4 subs, SVC or DVC.

🔗 Wiring wizard

How to wire your subs for your amp.

⚡ Amp match

Is your amp a good match for your subs?

🔋 Amp current draw

How much current your amp pulls.

📚 Guides

Learn the Basics

Sealed vs ported

Which box sounds best for your music.

8, 10, 12 or 15 inch?

Pick the right sub size for your car.

How to set gain

Get loud, clean bass without clipping.

DVC wiring

Wire dual voice coil subs the right way.

Build a sub box

Materials, measuring and sealing.

Buying guides

What specs actually matter when you buy.

Frequently Asked Questions

Why is my subwoofer not working?

Most often it is a blown fuse, a bad ground, a setting on the head unit or the amp in protect mode. Start with the No Bass Fix.

What impedance should I wire my subs to?

Whatever final load your amp is stable at and makes the most power at, usually 1 or 2 Ω for mono amps. Use the impedance calculator.

How big should my sub box be?

Follow your sub’s manual. Then check your build with the box volume calculator.

How much power do my subs need?

Match amp RMS to the subs’ total RMS. The amp match tool does the math.

📥 Free download: take the printable No-Bass Troubleshooting Checklist out to your car.