I drive a 1965 Corvette that I have slooowly restored over the past 30 years. Presently, I would like to upgrade the speaker system but do not have the manual that came with the after market cassette receiver, Pioneer model KE 111. The unit was installed in the early 1990's. I am looking desperately for a manual in order to decide what to do with unit in place. My other option is to have my original am-fm receiver rebuilt to modern spec's. Any help would be greatly appreciated.