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Low Earth Orbit
DIY Audio
60 Degree DIY Mid Hi - AKA PM60
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<blockquote data-quote="Peter Morris" data-source="post: 214938" data-attributes="member: 652"><p>Hi Max</p><p></p><p>You are 100% correct, the original PM90 was tuned at 80Hz (I had to look it up <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":-)" title="Smile :-)" data-smilie="1"data-shortname=":-)" />. After that every one want a 60 degree box. It used the 18sound horn and the box had to be made deeper and a bit wider. This increased the volume a little. The port size was unchanged so it was tuned lower. I will do an impedance sweep and check.</p><p></p><p>And ... yes you will get a better by ensuring you still have output below the crossover point.</p></blockquote><p></p>
[QUOTE="Peter Morris, post: 214938, member: 652"] Hi Max You are 100% correct, the original PM90 was tuned at 80Hz (I had to look it up :-). After that every one want a 60 degree box. It used the 18sound horn and the box had to be made deeper and a bit wider. This increased the volume a little. The port size was unchanged so it was tuned lower. I will do an impedance sweep and check. And ... yes you will get a better by ensuring you still have output below the crossover point. [/QUOTE]
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60 Degree DIY Mid Hi - AKA PM60
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