Repair speaker without removing Dust cap !!! 

#homemade_audio
in this video we show you how to Repair yamaha ns690 speaker Foam Surrond without removing Dust cap
this is a new way of refoaming speakers quickly with a lots of advantages.
when installing a recone kit, the use of shims is essential to center the coil and the spider.
in the case of only changing the suspension, the spider is already well centered, so you just have to center the cone.
if you have noticed that as soon as the new suspension is installed, the coil automatically takes the right position even before doing the trips!!!
especially when using an original suspension.
I'm used to install refoam kit like that without any problems!!!!
for people who change old dust cap with new aftermarket one for midwoofer or midrange, be sure that the sound of your speaker will change badly, because in this kind of drivers the dust cap produces mid and high response!!!