Amplifier and speaker matching tool

Pick a speaker and tell us how loud you listen and how big the room is. We work out the power it actually needs, check which amplifiers can safely drive its impedance, and rank 297 amplifiers against it.

Your system

Four questions. Nothing is hidden on price.

Passive speakers only - a powered speaker already has its amplifier inside.
Changes the order only. Nothing is hidden for costing too little or too much.

What this actually checks

Three things decide whether an amplifier and a speaker get on, and only one of them is watts.

  • Power. How many watts the speaker needs to reach your listening level in your room, worked out from its sensitivity - not from the number on the box.
  • Impedance. Whether the amplifier is rated to drive the load. This is the one that damages equipment, and it is the one most buyers skip.
  • Current. Whether the amplifier's power rises when the impedance halves, which is the cheapest honest proxy for a power supply that copes with a hard load.

Pick a speaker on the left to start. Every result gets its own link you can share.

Was this calculator useful?
We read every comment, and it is what decides which tool gets built next.

More tools

💰
System Budget Planner
Split a total across speakers, amplifier and subwoofer, then fill every slot with real models that work together.
📏️
Will It Fit? Speaker Size Finder
Measure your shelf or alcove and see every speaker that goes in it, with a warning where a rear port needs more room than the box does.
🔌
Speaker Wire Gauge Calculator
How thick your speaker cable needs to be for the run length and impedance, and what you lose if it is too thin.
⚡
Speaker Impedance Calculator
Wire two or more speakers in series or parallel and see the load your amplifier actually sees.
📏
Speaker Placement Calculator
A plan view of your room: speaker spacing, wall distances, where the bass cancels and where the first reflection lands.
🎸
Subwoofer Crossover Calculator
Where to set the crossover between your speakers and a subwoofer, and which reason is driving the answer.
🎧
Speaker Test Tones
Channel check, polarity, bass extension and frequency sweeps, generated in your browser. Nothing to download.
🏠
Room Mode Calculator
The frequencies your room reinforces and cancels, where they pile up, and what to move first.
📣
SPL & Amplifier Power Calculator
How loud a speaker plays for a given power at a given distance - or how many watts you need for a target level.