Bluetooth Speaker (OEM / Custom Brand)

What to Check When Sourcing

Bluetooth speaker factories cluster around Shenzhen (Longhua, Baoan districts) and Dongguan. Most offer a catalog of reference designs with cosmetic customization — firmware and acoustic tuning are where the real differentiation lives.

Acoustic tuning vs. spec sheet performance. Frequency response graphs on factory datasheets are typically measured in anechoic chambers at 1 meter with the speaker driven at 1W. Real-world loudness and bass response depend on enclosure volume, port tuning, and DSP EQ. Request pink noise test files and compare samples side by side at identical SPL levels, not at “max volume” — different factories set different SPL limits.

Firmware customization scope. Most factories run a shared firmware stack (often Airoha or Qualcomm chipset SDKs). Custom button mapping, pairing behavior, EQ presets, and voice prompt replacement are standard NRE items — expect $500–2,000 for basic customization. Source code access is rarely granted; clarify whether you receive binary OTA files or a private firmware branch.

DSP tuning fees. If the reference design uses a standalone DSP chip (e.g., TI TAS5805M, Qualcomm DDFA), acoustic EQ tuning is a separate billable deliverable. Confirm whether the quoted price includes tuning or only hardware assembly.

IPX vs. IP Certification: What Factories Actually Test

IPX ratings require specific standardized test procedures under IEC 60529. “IPX5” means tested against a 12.5 L/min water jet from any direction for 3 minutes. “IPX7” means submerged to 1 meter for 30 minutes.

Many factories quote an IPX rating based on design intent (sealed enclosure, silicone gaskets) without performing the IEC 60529 test. Ask for the actual test report with test lab accreditation number. For Amazon listings, an unverified IPX claim is an IP infringement risk and a potential listing removal trigger.

For IPX7, confirm the USB-C port sealing mechanism — spring-loaded covers degrade after repeated cycles. Request a 50-cycle open/close test report if the port is meant to be user-accessible.

Common Pitfalls

BT version mismatch. A factory may produce BT 5.3 hardware but ship firmware with BT 4.2 profiles. The BT version in the spec sheet should reflect the active firmware profile, not the chip datasheet maximum.

FCC ID on white-label units. If the factory uses a pre-certified RF module (common for cost reduction), confirm that your custom enclosure does not require a new FCC filing. Module certification covers the module only — if you change the antenna or enclosure, a new filing (TCB route: ~$1,500–3,000 and 4–6 weeks) may be required.

Battery real capacity vs. rated capacity. Request a discharge test report at 0.2C rate to room temperature cutoff. A “2,000 mAh” cell that discharges at 1,600 mAh is common in B-grade sourcing.