Hello, I have a pair of SDA 1 speakers. I do not have the interconnect. 2 of the tweets do not work and a couple of the woofers are not working. I have played them a few times and the fuses go out pretty often. Is it worth it to upgrade these or should I dump them and get some 1c? Can I bypass the fuses and upgrade to the type of protection in the newer units? Any instruction or advice would be greatly appreciated. Thank you in advance.