JohnA Posted October 21, 2017 Share Posted October 21, 2017 I just bought a KSM-12-II-B to use in live performances. It is very clean and has almost no signs of use. The SN is KSM12B-0518 0027 and it was inspected/tested by Gwen Stewart. How old is it? What drivers should it have? What are the correct fuses? It had a 20A AGC fuse in the HF fuse holder and nothing in the LF fuse holder. For now the 20A in in the LF and a 3A in in the HF. It sounds fine, but maybe a little bright. I would like to have another. Quote Link to comment Share on other sites More sharing options...
JohnA Posted October 22, 2017 Author Share Posted October 22, 2017 Quote Link to comment Share on other sites More sharing options...
Dave A Posted October 22, 2017 Share Posted October 22, 2017 Hi John, I had the same fuse question for a pair of KP-320's I bought recently. Marked on the input cup was 4 amp low and 1 amp hi. What was in there was 20 amp and the woofers had been blown up literally. I was told that pro speakers came with 20 amp fuses from the factory per installer requests so they would not have to climb up in the air to fix things. The speakers were supposed to be protected electrically downstream from either remote fuses or other electrical circuit limiters. If this was not done then follow what is on the input cup was the advice I was given. Quote Link to comment Share on other sites More sharing options...
JohnA Posted October 22, 2017 Author Share Posted October 22, 2017 I don't have any markings on the input cup for the fuses. For now I'm going with 5 and 3. Quote Link to comment Share on other sites More sharing options...
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