How much RMS power do I need for my subwoofer?

The ideal amp provides 75–100% of your subs' total RMS rating for daily use, or 100–125% for louder setups. Under-powering a sub can clip the signal and damage it faster than mild over-powering. Avoid exceeding 150% to prevent damage.

What does impedance stability mean for a subwoofer amp?

An amp is 'stable' at an impedance if it can safely deliver rated power at that load without overheating or shutting down. Most American Bass monoblocks are 1-ohm stable. Sub-ohm loads (0.5 ohm) require King, Godfather Comp, or VFL Comp Pro series amps.

What is the difference between series and parallel wiring for subwoofers?

Parallel wiring lowers the final impedance and pulls more power from the amp. Series wiring raises the impedance. Series-parallel combines both methods. The right choice depends on your sub count, voice coil configuration, and amp's minimum stable impedance.

Should I use a Class D amp for my subwoofer?

Yes. Class D monoblock amplifiers are the standard for subwoofers — they run cool, draw less current from your battery, and put more energy into bass. Every American Bass monoblock is Class D with built-in low-pass crossover, subsonic filter, and bass boost.

Subwoofer Amp Matching Calculator

Quick start (optional)

Your subwoofer

Pick your AB sub and we'll fill in the RMS, coil type, and impedance automatically.

Number of subs

RMS per sub

watts

Voice coil type

Coil impedance

Wiring configuration

Pick how you'll wire the coils — the dropdown shows the final impedance and what each option means.

Power goal

Your build math.

Live impedance, total power, and amp wattage target.

Final Ω

2Ω

Sub-ohm load

System RMS

3000W

2 × 1500W

Amp target

2250–3000W

RMS @ 2Ω

Your matched amps.

Top 3 AB monoblock amps for your build.

Subs

—

Pick a sub above to see pricing

Top amp

—

Total system

—

Sub + amp

Build it in one click

Pick a subwoofer above and we'll bundle it with the top-matched amp into a single cart link.

Recommended add-on: a 4-gauge wiring kit (handles up to ~1,500W). Browse AB wiring kits →

What to look for in an amp.

Your amplifier should meet these specs.

RMS Power

375

to 625 Watts

At Impedance

2Ω

stable

Channels

Mono

Class D recommended

✓ Amplifier Shopping Checklist

✓
RMS Power @ 2Ω: Look for 375 – 625 watts RMS (not peak/max)
✓
Stable @ 2Ω: Amp must be stable at this impedance or lower
✓
Monoblock / Class D: Most efficient for subwoofers
✓
CEA-2006 Certified: Ensures honest power ratings (optional but recommended)

💡 Power Matching Guide: The ideal amp provides 75–100% of your subs' total RMS rating for daily use, or 100–125% for louder setups. Avoid exceeding 150% to prevent damage.

Need speakers too?

Your sub setup is dialed in. Match your front stage with the right multi-channel amp next.

Speaker & Amp Calculator →