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Junior Varsity
When to replace drivers.
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<blockquote data-quote="Chris Davis" data-source="post: 23745" data-attributes="member: 137"><p>Re: When to replace drivers.</p><p></p><p></p><p> </p><p>The frequency traces seem to correlate with my listening experiences. I have worked on several sets of these, as well as own a couple pairs myself. Having listened very carefully to each driver when servicing them - before and after, as a complete speaker system and exclusively driver by driver, I can say this represents the trend I heard. Not bad at all though, as the differences were very subtle and not noticeable to me with the other drivers running. To do this listening test, I also moved the same crossover from cabinet to cabinet to eliminate that as a variable (with the wires all dangling out of the back).</p><p></p><p>IMO, this was probably due to the magnet slowly losing its magnetism over a period of about 20 years or so. Replacing any M200 diaphram with a new one made absolutely no audible difference for me. On this graph, you can see the lower and upper extremes of the M200 roll off. I did hear this between the older and newer drivers (completete new assemblies), but really only when doing my critical listening tests when servicing them. But, as I said before, that was not even that noticeable to me in the grand scheme of things.</p><p></p><p>I don't really know what to say about the upper end of the phase trace.</p><p></p><p>P.S. Oops, now I see you were originally asking about the HF drivers (Silas's [post got me thinking about the m200's. Have you retried that test to see if might you come up different results?</p></blockquote><p></p>
[QUOTE="Chris Davis, post: 23745, member: 137"] Re: When to replace drivers. The frequency traces seem to correlate with my listening experiences. I have worked on several sets of these, as well as own a couple pairs myself. Having listened very carefully to each driver when servicing them - before and after, as a complete speaker system and exclusively driver by driver, I can say this represents the trend I heard. Not bad at all though, as the differences were very subtle and not noticeable to me with the other drivers running. To do this listening test, I also moved the same crossover from cabinet to cabinet to eliminate that as a variable (with the wires all dangling out of the back). IMO, this was probably due to the magnet slowly losing its magnetism over a period of about 20 years or so. Replacing any M200 diaphram with a new one made absolutely no audible difference for me. On this graph, you can see the lower and upper extremes of the M200 roll off. I did hear this between the older and newer drivers (completete new assemblies), but really only when doing my critical listening tests when servicing them. But, as I said before, that was not even that noticeable to me in the grand scheme of things. I don't really know what to say about the upper end of the phase trace. P.S. Oops, now I see you were originally asking about the HF drivers (Silas's [post got me thinking about the m200's. Have you retried that test to see if might you come up different results? [/QUOTE]
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When to replace drivers.
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