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High Frequency Compression Driver Evaluation
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<blockquote data-quote="Art Welter" data-source="post: 55892" data-attributes="member: 52"><p>Re: High Frequency Compression Driver Evaluation</p><p></p><p></p><p>Greg,</p><p></p><p>Back in the "olden days" we used RTA for measurement, I only saved a few printouts, but there were differences in both cones and HF drivers, some from the factory, some over time from road use and abuse.</p><p></p><p>I have a lot of Eminence Alpha 8A and Lab 12 cones, they all measure remarkably consistent (within 1 dB) regardless of age purchased.</p><p>The Eminence PSD2002 and APT tweeters are not as consistent, with unit to unit variations of more than 3 dB.</p><p>When designing passive crossovers for those drivers, I have had to use an average between units.</p><p>To reach more consistency I matched and numbered the four pairs of APT tweeters used in my stage monitors, that way at least each pair will work together with one EQ.</p><p></p><p>Art</p></blockquote><p></p>
[QUOTE="Art Welter, post: 55892, member: 52"] Re: High Frequency Compression Driver Evaluation Greg, Back in the "olden days" we used RTA for measurement, I only saved a few printouts, but there were differences in both cones and HF drivers, some from the factory, some over time from road use and abuse. I have a lot of Eminence Alpha 8A and Lab 12 cones, they all measure remarkably consistent (within 1 dB) regardless of age purchased. The Eminence PSD2002 and APT tweeters are not as consistent, with unit to unit variations of more than 3 dB. When designing passive crossovers for those drivers, I have had to use an average between units. To reach more consistency I matched and numbered the four pairs of APT tweeters used in my stage monitors, that way at least each pair will work together with one EQ. Art [/QUOTE]
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