I HAVE 2 QUESTIONS. FIRST I RECENTLY PURCHASED A PAIR OF VINTAGE KG4 OFF EBAY. THE SELLER DIDN"T HAVE MANUAL FOR THEM. WHERE CAN I GET A COPY OF THE MANUAL FOR THE KG4. SECOND QUESTION. THE SPEAKERS SOUND GOOD BUT WITH THE DRIVERS BEING ALMOST 20 YEARS OLD WOULD IT BE A GOOD IDEA TO REPLACE ALL OF THE DRIVERS.