electronics manufacturer and after tests

[and77man]

Electronic products, for example: KZ brand headphones, after manufacturing, do they undergo any individual tests to prove that they are working correctly and without physical damage? Or do they only test some units from a batch?

I have some units sealed with plastic stored away

 

[ZipZapOuch]

Electronic products, for example: KZ brand headphones, after manufacturing, do they undergo any individual tests to prove that they are working correctly and without physical damage? Or do they only test some units from a batch?

I have some units sealed with plastic stored away

A place that spits out millions at $2 are not likely testing anything after they "dial-in" the manufacturing process. It would be much cheaper to just refund the customer or give them a free replacement if the manufacturing process has less than 1% defects. Also, when a customer knows that a good pair of headphones costs more than $50 and very good headphones can cost 10x or 20x that good price, a customer who buys $2 headphones is very unlikely to complain about any defect or poor performance. The customer is more likely to just pick a different brand for the next pair and not even worry about the hassle of replacing them or expecting any support from the retailer or manufacturer.

 

[VoidWalker77]

Most electronic products like KZ brand headphones go through a combination of batch testing and random quality control (QC) checks during manufacturing. That means not every single unit is tested individually. Instead, a sample from each production batch is inspected for sound quality, functionality, and physical condition.

 

[Tony Stewart]

The easiest test is to apply 1.5V from a battery or DC supply with an acoustic signature, which skilled assemblers can quickly recognize. The battery would also emit brown noise current which is not the fault of the speaker.
This assumes all factories perform some minimal electrical tests in mfg. according to the expected quality levels that can vary by production tolerances to avoid recall costs, cumulative scrap, or loss in customer loyalty from future orders in bulk. Additional tests add value to the manufacturing process control.

However, beware that prices below expected cost may indicate something below acceptable quality for normal prices, such as a scrap sale to some 3rd party now being sold again.