AMPLIFIED  ·  FIELD TOOL

CLIPPING FINDER

Stop guessing your gain. Answer four questions, get the exact AC voltage to dial in on a $15 multimeter, no oscilloscope required.

What's your amp's total rated RMS power?

Use the manufacturer's RMS spec (not "max" or "peak") at the final impedance you'll run.

WATTS RMS

What's your final load impedance?

The total ohm load the amp sees after your subs' voice coils are wired together, pick the closest match or enter your exact value.

0.5Ω
0.66Ω
1Ω
1.33Ω
1.5Ω
2Ω
2.67Ω
3Ω
4Ω
5.33Ω
6Ω
8Ω

Running an odd wiring setup? Enter the exact final load instead:

Ω FINAL LOAD

How's your electrical system holding up?

Be honest, this is the #1 reason calculated numbers don't match real-world results.

Stock, no upgradesNoticeable dim/sag under bass hits · ~12.6-13.0V
Healthy charging systemStock alt, good battery, minor sag · ~13.6-14.0V
Upgraded electricalBig 3, AGM/lithium, or high-output alt · ~14.4V+

Confirm your setup

This is what we'll run the numbers on.

-Rated RMS power
-Final impedance
-Electrical system
-
Set gain to
-Vac
Clipping onset
-Vac

How to use it

  1. Set your head unit volume to ~75% first, no higher. Most decks distort their own preamp output above this, and if the source signal is already clipped, your gain setting will be built on a dirty signal no matter what the meter reads.
  2. Play a 40-50Hz test tone at that fixed volume, don't touch it again during the process.
  3. Set your multimeter to AC voltage and touch probes across one sub's + and − terminals.
  4. Slowly raise the amp's gain while watching the meter.
  5. Stop the moment you hit - Vac. That's your setting, don't chase the red line.
Assumes RMS is rated at a 14.4V rail (standard industry spec) and that output scales with the square of rail voltage, the same relationship that governs clipping in a voltage-limited amplifier. Preamp/RCA voltage doesn't change the target, the gain knob compensates for it, but a clipped source signal will still throw off real-world results even at the "correct" reading, which is why the 75% volume step above matters.