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Low Earth Orbit
DIY Audio
New DIY Mid High (90deg) - AKA PM90
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<blockquote data-quote="Peter Morris" data-source="post: 132723" data-attributes="member: 652"><p>Re: New DIY Mid High</p><p></p><p>I think I have finally managed to get some really excellent directivity behaviour ... just needed a few more tricks with the crossover.</p><p></p><p>I can make that dip at 700HZ on the vertical plot a little bit better, but I'm concerned about load on the HF driver. </p><p></p><p>The FIR time is now only 2.5ms. The impulse response is still almost perfect and the phase response is almost the same above 300Hz. Because I'm now using an IIR crossover for the subs there is another 180 degrees of phase shift in the low frequency end compared to the first plots I posted.</p><p> </p><p>Top plot - vertical</p><p></p><p>Bottom - horizontal</p></blockquote><p></p>
[QUOTE="Peter Morris, post: 132723, member: 652"] Re: New DIY Mid High I think I have finally managed to get some really excellent directivity behaviour ... just needed a few more tricks with the crossover. I can make that dip at 700HZ on the vertical plot a little bit better, but I'm concerned about load on the HF driver. The FIR time is now only 2.5ms. The impulse response is still almost perfect and the phase response is almost the same above 300Hz. Because I'm now using an IIR crossover for the subs there is another 180 degrees of phase shift in the low frequency end compared to the first plots I posted. Top plot - vertical Bottom - horizontal [/QUOTE]
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