Hans5849

Hello, My dad has a pair of AL-III's that don't work. I'm in the process of troubleshooting them, he says the ribbons are bad but I'm going to investigate the system before saying the ribbons are toast. I have the service manual, but is there anything you all would suggest looking at? I don't have an O-Scope available to really get into the system, only a multimeter Are there any upgrades that would be prudent to complete on these speakers? So far I've seen getting a 12-14 gauge wire connected to the speakers and putting a 10" car stereo sub in.