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<blockquote data-quote="Ivan Beaver" data-source="post: 141598" data-attributes="member: 30">Re: 60 Degree&nbsp; DIY Mid HiAnd there are failures other than voice coils opening up or diaphragms breaking.During one of my &quot;testing sessions&quot; (I monitor performance via dual transfer function-so I can see changes in real time), one driver (from a very respected manufacturer) started to show signs of reduced output-a good bit sooner than a different manufacturer driver (being driven from the same source at the same time).&nbsp; But I kept the test going until I had failure of one of the drivers.The driver that failed first was not the one that was showing the lowered output.But at the time of failure, the one with reduced output had a good bit lower actual output than the one that &quot;stopped working&quot; first.When the drivers cooled down enough for me to take apart, the one with the lowered output had actually melted about half of the&quot;exit areas&quot; in the phase plug.&nbsp; So the exit was essentially sealed off quite a bit-which was the cause for the lowered output.So the one that&nbsp; &quot;failed first&quot; (and in all fairness was rated at lower power), actually had a higher output longer than the one that &quot;kept working&quot; longer.&nbsp; But the one that kept working-would never come back to original performance-because of the sealed off area.So things are not always as they seem.Once again-you can&#039;t describe something complicated, with a &quot;simple&quot; number.</blockquote>

[QUOTE="Ivan Beaver, post: 141598, member: 30"] Re: 60 Degree DIY Mid Hi And there are failures other than voice coils opening up or diaphragms breaking. During one of my "testing sessions" (I monitor performance via dual transfer function-so I can see changes in real time), one driver (from a very respected manufacturer) started to show signs of reduced output-a good bit sooner than a different manufacturer driver (being driven from the same source at the same time). But I kept the test going until I had failure of one of the drivers. The driver that failed first was not the one that was showing the lowered output. But at the time of failure, the one with reduced output had a good bit lower actual output than the one that "stopped working" first. When the drivers cooled down enough for me to take apart, the one with the lowered output had actually melted about half of the"exit areas" in the phase plug. So the exit was essentially sealed off quite a bit-which was the cause for the lowered output. So the one that "failed first" (and in all fairness was rated at lower power), actually had a higher output longer than the one that "kept working" longer. But the one that kept working-would never come back to original performance-because of the sealed off area. So things are not always as they seem. Once again-you can't describe something complicated, with a "simple" number. [/QUOTE]

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