-your KHORN speakers were made in 1976 they are 44 years old , and , yes ,they are almost 45 years old ---
it is time to get the capacitors replaced with newer ones , the changes should make a difference in the sound , as long as the woofers , mids and tweeters are not defective in any way which can be tested very easily with an Ohmmeter ------woofers are 8ohms , mids 16 ohms , tweeters 8 ohms -