beloved jbl century 100's
I have 2 l-100's that I purchased new around 1973 along with a Sansui 9090 that has an output of about 110 watts per ch. My brother had the system for about 15 years and when I got it back ,It had 2 blown le5-2's and 1 blown le25. I replaced the bad speakers and 2 days later one le5-2 was blown again.So I bought 2 more but I cannot afford to replace speakers every 2 days. Back in the 70's I ran the speakers at full volume and full everything and never had any problem. Could the caps in the crossovers be bad? Any help is much appreciated in advance.
2 cents from good ole 2-cent Charley
Your Sansui 9090 DC voltage in your power amp stage needs serious balancing. Some solid state amps have pots on the board (like your 9090) which can be adjusted; otherwise the bias resistors on your output stage may be at fault. Don't waste any more money on your L100 components 'til your 9090 is checked out.
regards,
Charley
beloved jbl century 100's
OK, I finally got around to checking the 9090DB I measure .02 vdc on one channel and .04vdc on the other. Is this enough to cause the problem? If so , where do I look? Gotta be a cap somewhere in the circuit. I am using the sansui speakers for the testing and it doesn't seem to have any effect on them. The sansui's are rated for 70 watts and the l-100's 50 . Am I putting too much into the l-100's? Come on guys, I need your help!
:yes: :cheers: :duck: