Speaker subwoofer double magnet

A double magnet configuration significantly increases the magnetic flux density within the voice coil gap. This results in higher sensitivity, better control over the cone movement (damping), and increased power handling. For B2B buyers, this translates to a product that delivers deeper bass response and lower distortion at high volumes compared to single-magnet alternatives.

Focus on the Voice Coil Diameter (typically 2.5" to 4" for high-power units) and material, such as TIL or Black Aluminum for heat dissipation. Ensure the T-yoke and Washer are thick enough to prevent magnetic saturation. Additionally, verify the Xmax (linear excursion) to ensure the subwoofer can move enough air for true low-frequency reproduction.

Products must adhere to CE (LVD/EMC) for the European market and FCC for the United States. Since subwoofers involve adhesives and plastics, RoHS and REACH certifications are essential to ensure the absence of hazardous substances. For high-end audio, look for ISO 9001 certified factories to ensure consistent acoustic performance across batches.

Request test reports for the Spider (suspension) fatigue life and the Surround material (usually high-roll foam or rubber) UV resistance. The Paper Cone should be treated with a waterproof or non-pressed coating if intended for automotive or outdoor use. Ask for a Salt Spray Test report for the metal basket if the product will be sold in humid or coastal regions.

Subwoofers are heavy and contain strong magnets which can interfere with aircraft navigation. Ensure the supplier uses Magnetic Shielding Packaging if shipping via air. For sea freight, use palletized loading with reinforced corner protectors to prevent the heavy magnets from shifting and cracking the baskets during transit.

Do not negotiate on price alone, as this often leads to suppliers using thinner copper wiring or lower-grade magnets (e.g., Y25 instead of Y30/Y35 Ferrite). Instead, negotiate based on Total Value, requesting a 2-3% spare parts allowance (cones, dust caps, or gaskets) and a guaranteed defect rate of less than 1%.

Utilize secure payment terms such as Letter of Credit (L/C) or escrow services provided by reputable platforms like Made-in-China.com. Always conduct a Pre-Shipment Inspection (PSI) by a third party to verify that the Ohmic resistance and SPL (Sound Pressure Level) of the production units match the approved golden sample.

The most common pitfall is misalignment of Thiele/Small (T/S) parameters. Ensure the supplier provides a CLIO or LMS test report for the final prototype. Clearly define the Logo Printing Method (silk screen vs. embossed) and Packaging Crush Test standards (e.g., ISTA 1A) to avoid brand damage due to poor presentation or shipping damage.