it absolutely depends on what shape speakers are in.... and...the electronics inside the speakers capacetors ect. , they should be measured by somebody who knows what he s doing,knows the original values ect and it might be changed. After 30+ years its nearly impossible to find 4180 that's really ok so you have to put some money at least into the electronics. If the speakers are not good.. .dont buy. AND its really important what the IQs are combined with. It needs a powerful precise fast Amp, a big yamaha ect.
