I purchased an Infinti J30 today. When I test drove it yesterday,I noticed that the fader on the radio was set to front speakers only,but didn't think much about it.
After purchasing it today .I adjusted the radio and discovered a very loud horrible buzzing from the rear speakers.
Luckily,I found your web site,which gave me both instructions on removing the offending speaker,but also the diagnosis,which was a loose center dust cover.I got it fixed in a hour,it now sounds great and I am very happy.
Thank you very much for posting the instructions on the web,and I am enclosing a $10 donation for the support of your website.If any component really breaks,you will be the folks I send it to for repair.