Quality control should be first on the list when looking for a product. If you are having problems with an assembly, it is unlikely that they will go back to the factory for modification or replacement unless they have proof that their product is faulty. This proof can take many forms, including examples of other poorly manufactured products from the same source, samples of competitors’ superior cables, etc. The better their quality control system, the less likely this situation occurs. Therefore, you should look for a harness manufacturer with reasonable quality control measures in place before making a final decision.
When dealing with electrical products, the proof is in the performance. If you want to know how good a cable manufacturer’s quality control process is, you should test it yourself by gathering samples of competitor products and bringing them to the factory along with your own. You can then compare their product against some or all of these competitors and see any benefit in using their brand over others. If they provide some data that suggests they have higher sound quality than competitors’ cables, you may be on to something good! If not, stay away from this company – no matter how friendly they are.
The next thing you need to look for when finding a china cable manufacturer is flexibility. There will always be problems of one kind that arise during product design, manufacture, and shipping. If there is no flexibility on the part of the cable manufacturer, then your problems will be passed along to you. At this point, they won’t care what the problem is or how it arose because you are just another customer to them. What’s worse than dealing with a poor quality control system? Dealing with someone who doesn’t want to help.
The best manufacturers would do their best to correct problems so both parties can go forward happily! It may not happen immediately, but rest assured that if they don’t budge an inch now, they will never later.