Amplifier Load And Speaker Safety Workflow

Use one sheet per amplifier/channel group and driver system. Attach scope captures, impedance files, temperature notes, and final presets.

System And Test Contract

Vehicle / bench supply:

Amplifier model / serial:

Channel mode / bridge state:

Channels driven:

Signal / frequency / bandwidth:

Duration / cycle / crest factor:

Distortion or stopping criterion:

Ambient / starting temperature:

Supply And Delivery

Source voltage:

Amplifier-terminal voltage:

Positive-path drop:

Return-path drop:

DC input current:

Fuse / holder / conductor temperature:

Battery / alternator / bench-source state:

Output Measurement

Load-bank resistance / rating:

Probe / isolation method:

Vrms / Vpeak:

Irms / Ipeak:

Calculated / measured real power:

THD+N / clipping endpoint:

First amplifier limit:

Bridge And Floating Output

Manufacturer bridge instructions:

Specified minimum bridged load:

Output topology confirmed by:

Differential measurement method:

Channel polarity / terminal map:

Common-mode / probe limit checked:

Loudspeaker Load

Driver / enclosure / crossover:

Voice-coil wiring:

Cold Re:

Nominal impedance:

Measured minimum magnitude:

Important phase / resonance region:

Hot resistance / curve change:

Speaker Thermal Limit

Published rating and method:

Test spectrum / crest factor:

RMS / peak terminal voltage:

Duration / cycling:

Resistance or temperature rise:

Compression / distortion:

Approved thermal margin:

Speaker Mechanical Limit

Xmax value and definition:

Xmech / clearance if known:

Enclosure tuning / loading:

High-pass filter / slope:

Worst excursion frequency:

Displacement / model method:

Rub / buzz / offset / compression limit:

Protection And Final Settings

Maximum approved source setting:

Maximum approved DSP output:

Amplifier gain / sensitivity:

Limiter threshold / detector / timing:

Thermal protection method:

Mechanical protection method:

Preset / file / date:

Stop-Now Conditions

Smoke, odor, arcing, melted insulation, or rapidly rising terminal temperature
Repeated amplifier protection, unstable supply, or uncontrolled output
Unsafe probe common mode or unknown floating-output reference
Driver rub, buzz, ticking, bottoming, asymmetric motion, or sudden resistance change
Falling output, rising distortion, or thermal compression beyond the approved margin

Final Verification

□ All channels and bridge assignments verified at low level
□ Supply and loaded voltage drop verified
□ Clean amplifier output limit recorded
□ Loudspeaker impedance and wiring verified
□ Thermal and mechanical limits verified separately
□ Protection filters and limiters verified at the physical output
□ Actual worst-case condition repeated after thermal soak
□ Post-test resistance, impedance, rub/buzz, noise, and listening checks passed