Audio Testing Methods Used by Manufacturers
March 24, 2026
The moment you press play on your favorite song, take a conference call, or ask your smart speaker for the weather, an invisible contract of
Every speaker, microphone and module we ship passes the same chain of checks — incoming materials, in-process inspection on the line, and 100% end-of-line acoustic test. Below is what we test, with what equipment, and at which stage.
Frames, cones, magnets, voice coils, PCBs, cables and packaging materials are checked against the drawing and AQL plan before they enter the warehouse — dimensions, appearance, materials and key electrical parameters.
IPQC patrols every production stage: coil winding, assembly, glue curing and soldering. First-article checks open each batch, and spot checks continue at fixed intervals so problems are caught on the line, not at packing.
Before packing, every unit passes 100% end-of-line testing — impedance scan, polarity and sweep listening — plus a final visual check. Batch records link each unit to its shift, line and material lots.
Our lab in Jiashan runs the measurements that decide whether a speaker sounds right and lasts. Acoustic data is captured with a B&K (Brüel & Kjær) microphone chain and an MLSSA system — the same class of equipment our customers’ acoustics teams use — so your curves and ours match one-to-one.
Each test has a defined condition, sample size and pass criterion written into the control plan. Items we do not measure in-house — for example full EMC testing — are handled by accredited third-party laboratories, and we share the reports with you.
| Category | Test items | Equipment / method | Stage |
|---|---|---|---|
| Acoustic | Frequency response, impedance, sensitivity, THD, Rub & Buzz, polarity | B&K microphone chain + MLSSA system; impedance testers | Sample validation; 100% at end of line |
| Electrical / power | Rated and maximum power handling, life endurance, temperature rise | Power test rig, endurance rigs | Design validation and first samples |
| Environmental | High / low temperature, humidity, thermal cycling, vibration, drop, water exposure | CTHM climate chamber, YWX environmental chamber | Per project plan and key batches |
| Mechanical / assembly | Dimensions, sealing and air-leak check, torque, appearance | Calipers, custom gauges and assembly fixtures | IQC, in-process and OQC |
| Compliance | RoHS and REACH substance screening | XRF RoHS tester; accredited third-party laboratories for certificates | Incoming materials and per batch |
The first question: does the design work at all?
The second question: does it survive real use?
The third question: is this exact unit good to ship?
Every product ships with a control plan that maps each check, its sample size and its pass criterion.
Material lots, shift and line data are recorded per batch, so any field issue can be traced to its root.
Material, tooling or process changes are notified to you before they ship — no silent substitutions.
Nonconformances go through a structured 8D process with root-cause analysis and verified preventive actions.
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Ask for an anonymised test report or a datasheet for any model — we reply within one business day.
