Hi, my system is the HK AVR225 and 5 JBL speakers The problem is the following: Almost always, after some minutes of beginning a movie the front left an rigth speaker make a sound like: PUFF! and they stop the sound, and they work the next day again (aprox. after 10 hours). But, the problem is not the speakers, it is the reciever because I change the rigth or left speaker to the central position and they work perfectly, and I change the central speaker to the position rigth or left channel and it doesn't sound. Which will the problem be? please help me!!! Sorry for my bad English. Thanks!