Second, in the Guoqiang Road near the North Road of the Outer Ring there is also a second-hand transfer market . These 2 places are used audio sales, but also buy old audio.
As for repairing audio speakers, I think the most professional is the Nantong Electroacoustic Factory, but I have not contacted them for N years, I do not know if the factory is still there, if you need me, I can help you contact.
Secondly, you can look for Gongnong Road, No. 125 Electrical Market, which has a repair of audio speakers, about a row in the north there is a, the owner was originally Nantong Electroacoustic Factory.
JBL SRX 715 is a very good speaker, the original speaker effect is very good, but also more expensive, this series is the original U.S. imports, if repaired after the effect will be greatly reduced; if the requirements are high, it is recommended to look for the manufacturer's after-sales service center in Shanghai, to buy the original speaker voice coil (a common failure is to burn the speaker voice coil) or other accessories, repair, power can be recovered to 90%.
Additionally, there are experts in Shanghai who specialize in repairing JBL speakers, which is an option between the original and others. Repair costs are also between this, basically in line with the principle of a penny for a penny.
Please choose according to your own needs, I hope to be able to adopt.