AMPLIFIED  ·  FIELD TOOL

CLIPPING FINDER

Get a calculated AC voltage target you can set with a basic multimeter, then learn how to verify it the right way.

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 nominal final load?

The nominal ohm load your subs or speakers are wired to, not the impedance rise you'd measure at idle. 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

What are you setting?

This picks the right test tone. A test tone outside the amp's passband won't give you a real reading, even if everything else is correct.

Subwoofer amplifierLow-pass filtered, bass only
Midbass amplifierUpper-bass, kick drum/midbass range
Full-range amplifierNo aggressive filtering, wide passband

How's your electrical system holding up?

This doesn't change your target voltage, amplifiers don't all scale with supply voltage the same way, but it changes how much to trust a reading that won't reach the target.

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
-Nominal final load
-What you're setting
-Electrical system
Calculated Target -
DMM Target
-Vac
Rated-Power Voltage
-Vac

Your target is set below the calculated rated-power voltage on purpose, to leave setup headroom. It is not a measured clipping point.

Use this exact test tone

-

How to use it

  1. Turn off bass boost, loudness, and any EQ boosts you're not keeping in the final tune.
  2. Set the remote level/bass control to the position specified by the amplifier manufacturer for gain setup. If that position is unknown, check the amplifier manual before proceeding.
  3. Disconnect the speakers or subwoofers from the amp output, unless your amp's manufacturer specifically requires a connected load for this procedure.
  4. Set your source to its known clean-volume limit. Don't know it? Use ~75% as a conservative starting point, not a guarantee of clean output.
  5. Play the test tone above at that fixed volume, don't touch it again during the process.
  6. Set your multimeter to AC voltage and measure directly across the amp's speaker-output terminals.
  7. Slowly raise the amp's gain while watching the meter.
  8. Stop the moment you hit - Vac.
  9. Reconnect your speakers and verify normal operation. If you hear obvious distortion during normal verification playback, stop and recheck the setup.
Field Note A multimeter measures voltage, not waveform shape. This target gives you a repeatable gain-setting reference. It is not a verified clipping threshold. Actual clipping onset can only be confirmed with an oscilloscope, a distortion detector, your amp's built-in clip indicator, or a verified manufacturer gain-match procedure.
Meter Check Make sure your multimeter is rated to measure AC voltage above your target and supports the test-tone frequency. True-RMS is preferred, but a properly specified average-responding meter can accurately read a clean sine wave like the test tone above. That accuracy assumption breaks down once a signal clips and stops being a clean sine wave, another reason this target is for setup, not for detecting clipping itself.
Stop If You See This Stop if the clip indicator activates, the amp enters protect, supply voltage falls heavily or becomes unstable, or output voltage stops increasing normally as gain is raised. A calculated number never overrides what the system is actually doing.
View calculation details

Calculated from V = √(RMS x nominal load) at your entered rated RMS and final load, this is the AC voltage corresponding to the amplifier power you entered, not a measured clip point. The 5% voltage margin equals roughly 90% of the entered rated power (power scales with the square of voltage). That's a modest buffer, about 0.45dB below rated voltage, not a large safety margin, it exists to give you setup headroom, not to guarantee distance from clipping. Electrical system condition doesn't change these numbers, amplifiers don't all scale with supply voltage identically, it only changes how much to trust a reading that can't reach the target on a sagging system. Run one amplifier at a time if this system has more than one.

Want a tighter result? Add a measured RCA/preamp voltage, a measured supply voltage at the amp while playing, or a result from a clip indicator/distortion detector/oscilloscope, any of those improve confidence past a quick calculated target.

Save Your Setup

Enter your email to download your target voltage, test tone, and setup steps as a reference sheet. We'll also send you a copy so you don't lose it.