i was listening to my rf7-II the with my pioneer pl41 turntable played thru a harman kardon hk3490 and after i was finished i turned off the turntable and turned down the volume and the i noticed this low kind of static hiss coming out of the horns then checked to see if volume effected it and it did not i have never noticed this before and was wondering if its the reciever causing this or if the speakers are damaged or if it is the reciever and if it is the reciever will it damage the speakers