What Size Fuse Do You Need for Your Car Audio Amplifier
By Car Audio and Tint | Car Toys | Washington, Texas, Colorado ... | Published: 2026-10-22
Category: Tips & Care
A car audio fuse size guide that explains how to match your amp's power draw with the correct fuse, plus the differences between ANL and MIDI fuse types. Includes a Stinger fuse reference table.
Quick Answer
The correct car audio amplifier fuse size depends on the total current draw of your system—match the fuse rating to the sum of your amplifier's fuse ratings or its maximum current draw, then choose an ANL or MIDI fuse style that fits your distribution block.
Why Fuse Size Matters for Your Car Audio Amplifier
Using a fuse that's too small can cause nuisance blowouts, while a fuse that's too large won't protect your amplifier and wiring from overcurrent damage. The fuse is your safety net—match it to the wire gauge and the amplifier's current draw, not to what's lying around in your toolbox.
A common mistake is to upsize the fuse because the previous one kept blowing. That usually means there's a short or the wire gauge is too thin for the current. Fix the root cause, not the symptom.
ANL vs MIDI Fuse: Which Style Should You Use?
ANL fuses (like the Stinger SPF52300 PRO 300 AMP ANL Shoc-Krome) are bolt-in fuses designed for high-current amplifier power cables, typically over 100 amps. They have a flat body with mounting holes and are common in main power distribution circuits.
MIDI fuses (like the Stinger SPF5840 PRO Shoc-Krome 40 Amp MIDI and the Stinger SPF5860 Shoc-Krome 60 AMP MIDI) are also bolt-in but smaller, often used for secondary distribution blocks or smaller amplifiers that draw less than 80 amps. They share the same bolt pattern but in a more compact package.
Your choice comes down to the current rating you need and the space available in your fuse holder. For a single main amplifier pulling 200+ amps, an ANL is the standard choice. For multiple smaller amps, MIDI fuses save space in the distribution block.
Frequently Asked Questions About Car Audio Amplifier Fuse Size
- How do I calculate the fuse size for my car audio amplifier?
- Check the amplifier's manual for its maximum current draw in amperes. If that's not listed, use the formula: (Total RMS power x 2) / 13.8 volts. For example, a 500W RMS amp would need about (500 x 2) / 13.8 = 72.5 amps, rounded up to the nearest common fuse size (80A). Always fuse the main power wire at the battery with a size slightly above the total draw of all amps. Use the sum of all amplifier fuse ratings as your total current target, then select a fuse that matches that number exactly or the next size up.
- When should I use an ANL fuse vs a MIDI fuse?
- Use an ANL fuse (like the Stinger SPF52300) when your main power cable needs over 100 amps of protection—typically for a single large subwoofer amplifier or a multi-amp setup on a single power feed. Use a MIDI fuse (like the Stinger SPF5840 or SPF5860) for lower-current legs of your distribution block, usually under 100 amps, where space is tighter. ANL for high-current main runs; MIDI for secondary distribution or smaller amplifiers.
- Can I use a 40 amp fuse on a 60 amp amplifier circuit?
- No. The fuse should be rated for at least the maximum current the amplifier can draw. A 40 amp fuse will blow under normal operation on a 60 amp circuit, which will strand you without audio. Match the fuse to the amplifier's recommended rating or the main wire gauge—never undersize for protection. Always match or slightly exceed the minimum rating stated by the amplifier manufacturer.
Relevant Fuse Options
- Stinger SPF5840 PRO Shoc-Krome 40 Amp MIDI Fuse (3/pack): The Stinger SPF5840 PRO Shoc-Krome 40 Amp MIDI Fuse is offered in a 3-pack and uses a MIDI-style body with a 40 amp rating. This is the right choice for a secondary amplifier or distribution block leg that draws up to 40 amps, such as a small mono amp powering a subwoofer.
Stinger SPF5840 PRO Shoc-Krome 40 Amp MIDI Fuse (3/pack) - Stinger SPF5860 Shoc-Krome 60 AMP MIDI Fuse (3/pack): The Stinger SPF5860 Shoc-Krome 60 AMP MIDI Fuse is a 3-pack of 60 amp MIDI fuses. A 60 amp MIDI fuse is ideal for medium-power amplifiers—common for a pair of full-range speakers or a mid-sized subwoofer amp drawing around 60 amps.
Stinger SPF5860 Shoc-Krome 60 AMP MIDI Fuse (3/pack) - Stinger SPF52300 PRO 300 AMP ANL Shoc-Krome: The Stinger SPF52300 PRO 300 AMP ANL Shoc-Krome is a bolt-in ANL fuse rated for 300 amps. For high-powered systems with a single large amplifier or multiple amps on a common power wire, a 300 amp ANL fuse handles the main feed safely.
