Kevin Wheeler

I have three sets of AR4x and one set of AR4xa speakers Iam in the process of redoing. They need a lot of love. Inside they have some differences,even among sets. What is the best recommendation to replace the caps. I have not opened all of them up. Im on my second set.Some have a plastic rectangle, one has a silver can about the size of a c cell battery rated at 20uf 50 vnp. Send help. SOS.