Loudspeaker Driver Test Workflow

Rule: preserve the cool small-signal baseline before applying a test that can heat, shift, damage, or permanently alter the sample.

1. Project And Sample

Project / requirement ID:

Date / operator:

Manufacturer / model:

Sample / serial ID:

Nominal impedance:

Published data revision:

Prior use / repair / recone:

Visible condition:

2. Test Contract

Question: inspection / impedance / T/S / acoustic / distortion / excursion / matching / failure:

Fixture and orientation:

Boundary / enclosure:

Ambient temperature / pressure / humidity:

Signal / range / level:

Ramp / duration / repetitions:

Stop limits:

Acceptance criteria:

3. Cool Baseline

□ photographs and terminal identification complete
□ cone, surround, spider, frame, leads, glue and vents inspected
□ DC resistance method and value recorded
□ driver temperature and rest state stable
□ no rub, buzz, unstable resistance, loose part or visible damage

4. Conditioning State

Stored / cool / exercised / warm / recovered:

Conditioning signal:

Terminal level / current:

Duration / duty cycle:

Temperature or Re change:

Recovery interval:

5. Impedance Fixture And Calibration

DATS / REW / analyzer and software version:

Lead set / fixture:

Sense or reference resistor:

Open calibration:

Short calibration:

Known-reference result:

Sweep range / duration:

Terminal sweep voltage:

□ magnitude and phase saved
□ no clipping or range error
□ reconnect repeat passed
□ second low-level sweep passed linearity check

6. T/S Identification

Electrical / inductance model:

Fit residual / warnings:

Re / Fs / Qes / Qms / Qts:

Secondary method:

Sd source / effective diameter:

Mass 1 / mass 2:

Known net box volume / leakage:

Vas / Mms / Cms / Rms / Bl:

7. Acoustic Response

Microphone / calibration:

Distance / axis / reference point:

Baffle / enclosure / installed boundary:

Terminal voltage / power reference:

Gate / window / smoothing:

Near-field / far-field splice:

Directivity / listening window:

Sensitivity band and result:

8. Level, Distortion, Compression, And Defects

Source / amplifier chain headroom:

Level steps:

Harmonic / IMD method:

Fundamental compression:

First rub / buzz / defect level:

Fixture isolation checks:

Temperature / Re change:

First limiting mechanism:

9. Excursion And Large Signal

Sensor or model / calibration:

Measurement point / axis:

Xmax definition / criterion:

Xmech evidence:

Bl(x) / Kms(x) / Le(x):

Dynamic offset / rocking:

Application filters / enclosure:

Safe voltage-frequency envelope:

10. Recovery, Repeatability, And Matching

Recovery voltage / temperature / Re:

Repeat remove-and-reinstall spread:

Samples measured:

Tolerance metrics:

Outlier disposition:

Matched pair / group IDs:

Installed channel / enclosure:

Regression trigger:

11. Evidence And Approval

□ raw impedance, acoustic, distortion, displacement and temperature files preserved
□ calibration and fixture records attached
□ sample identifiers appear in every result
□ measured, fitted and derived T/S quantities separated
□ small-signal and large-signal limits separated
□ enclosure, crossover, gain and protection decisions linked
□ known limitations and first limiting mechanism documented
□ selected drivers tied to the system release record

Technical approval:

Date / release:

Open the full guided lesson.