Cavity speaker

When evaluating cavity speakers, focus on the Acoustic Pressure Level (SPL), typically ranging from 80dB to 95dB, and the Resonant Frequency (Fo), which determines the bass performance. Ensure the rated power (W) and impedance (Ω) align with your PCB design. High-quality units should feature NdFeB (Neodymium) magnets for superior sound density and PEI or PEEK diaphragms for thermal stability and durability.

Compatibility depends on the mechanical dimensions and the sealing method. You must verify the effective volume of the back cavity, as an insufficient air cushion will lead to sound distortion. Request 3D step files from the supplier to simulate the fit. Additionally, check the connection type, such as spring contacts, soldering pads, or wire connectors, to ensure seamless integration with your assembly line.

For global markets, the product must be RoHS and REACH compliant to ensure no hazardous substances are used. If the speaker is part of a wireless or Bluetooth assembly, it may require CE (Europe), FCC (USA), or IC (Canada) certifications. For automotive or medical applications, look for suppliers holding IATF 16949 or ISO 13485 certifications to guarantee rigorous quality management.

If your application is for outdoor or wearable devices, specify the IP rating (e.g., IP67 or IP68). This is achieved through waterproof breathable membranes (like Gore-tex) and specialized adhesive gaskets. Ask the supplier for a Salt Spray Test report if the product will be used in coastal or high-humidity environments to prevent corrosion of the metal mesh and voice coil.

Implement a strict sampling plan based on AQL 0.65/1.0 standards. Request a Pre-Shipment Inspection (PSI) where a third party tests the frequency response curve and Total Harmonic Distortion (THD) of a random sample. Using Made-in-China.com's Secured Trading services can also provide a safety net for your payment until the quality is verified.

Focus on volume-based tiered pricing. Acoustic components have high fixed setup costs; therefore, increasing your order from 1k to 10k units can often reduce the unit price by 15-25%. Additionally, negotiate for free tooling or mold modifications if you are committing to a long-term annual purchase agreement.

Cavity speakers contain magnets which are classified as 'Dangerous Goods' (Class 9) for air freight if the magnetic field strength exceeds certain limits. Ensure the supplier uses magnetic shielding packaging and provides a Magnetic Inspection Report to avoid customs delays. For sea freight, use vacuum-sealed anti-static bags and desiccants to prevent moisture from affecting the diaphragm tension.

Before sharing your proprietary housing designs or acoustic chamber blueprints, sign a Non-Disclosure Agreement (NDA). Ensure the contract specifies that all custom molds and acoustic tunings remain your intellectual property. Work with reputable manufacturers on Made-in-China.com who have a proven track record of OEM/ODM partnerships with global brands.