Loudspeakers can be divided into dynamic coil (electric), capacitive (electrostatic), piezoelectric (crystal or ceramic), electromagnetic (spring loaded), ionized, and pneumatic types based on their energy conversion mechanism and structure. Among them, electric speakers have the advantages of good electroacoustic performance, firm structure, and low cost, and are widely used; According to the sound radiation material, it can be divided into paper basin type, horn type, and diaphragm type speakers; According to the shape of the paper basin, it can be divided into circular, elliptical, double paper basins, and rubber folding ring speakers; According to the working frequency, it can be divided into bass, mid range, and tweeter speakers; Divided into low impedance and high impedance speakers based on voice coil impedance; According to the effect, it can be divided into direct speakers and ambient speakers
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China