![]() ![]() I have found that ferro fluid is a mixed bag and results are not always what the appear to be. But this is less likely to be the case in the high line large format drivers. I can see more likely changes that address manufacturing shortcuts or cost/value engineering compromises. The concept also presumes that the manufacturer somehow missed key factors during development, and I have rather strong doubts that companies like JBL, Altec, EV and the like did this. I suppose you might be able to somehow introduce a different phase plug.other than that, it gets pretty tough, pretty fast, I think. The curves did reveal a somewhat smoother response. ![]() I think these were on their K400 knockoff midrange horn (H350, a model number like this, anyway). I had written to them around 1980-81 about this alteration, and they sent me the frequency response curves for the non-fluidized driver and one with fluid. The driver was based on the EV 1824, if I am recalling correctly. Speakerlab did this on their later compression drivers for their Khorn knockoff. The only thing I've seen done is the introduction of ferrofluid in the coil gap, ostensibly to improve power handling, and can also be claimed to smooth response. On good ones (pro sound, large format), the clearances are pretty tight and the machine work also quite exacting. Modding compression drivers is a pretty touchy thing.
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