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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: 140908" data-attributes="member: 652"><p>Re: 60 Degree DIY Mid Hi</p><p></p><p>Here are some directivity plots for the FIR settings. No one does this but I have used 1 dB per division !!! Note how well the mid behaves and that the nominal response is better than +/- 0.5 dB with 1/3 Oct smoothing.</p><p></p><p>The first picture is the vertical plot, the second is the horizontal plot, the third is 18sound plots <a href="http://www.eighteensound.it/Portals/0/PDFs/XT1464.PDF" target="_blank">http://www.eighteensound.it/Portals/0/PDFs/XT1464.PDF</a></p><p></p><p>As you can see the 18sound horn is very well behaved when you look at it "normally" ... so be careful when looking at the 1 dB plots. Even where the response looks awful, above 1KHz its still +/- 3 dB. Also notice how well behaved the phase response is on and off axis. </p><p></p><p>I'm still going to try a few more tricks tomorrow to see if I can improve the directivity transition between the VHF and HF. </p><p></p><p>I have also posted my HF and VHF IIR settings.</p><p></p><p>MID crossover 24dB LR - 600Hz</p><p>HF Crossover 24dB Butterworth - 6K5Hz</p><p></p><p>MID </p><p></p><p>polarity +ve</p><p>delay 0ms</p><p></p><p>HF</p><p></p><p>polarity +ve</p><p>delay 1.54ms</p><p> </p><p>VHF </p><p></p><p>Polarity -ve</p><p>delay 1.76ms</p></blockquote><p></p>
[QUOTE="Peter Morris, post: 140908, member: 652"] Re: 60 Degree DIY Mid Hi Here are some directivity plots for the FIR settings. No one does this but I have used 1 dB per division !!! Note how well the mid behaves and that the nominal response is better than +/- 0.5 dB with 1/3 Oct smoothing. The first picture is the vertical plot, the second is the horizontal plot, the third is 18sound plots [URL]http://www.eighteensound.it/Portals/0/PDFs/XT1464.PDF[/URL] As you can see the 18sound horn is very well behaved when you look at it "normally" ... so be careful when looking at the 1 dB plots. Even where the response looks awful, above 1KHz its still +/- 3 dB. Also notice how well behaved the phase response is on and off axis. I'm still going to try a few more tricks tomorrow to see if I can improve the directivity transition between the VHF and HF. I have also posted my HF and VHF IIR settings. MID crossover 24dB LR - 600Hz HF Crossover 24dB Butterworth - 6K5Hz MID polarity +ve delay 0ms HF polarity +ve delay 1.54ms VHF Polarity -ve delay 1.76ms [/QUOTE]
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60 Degree DIY Mid Hi - AKA PM60
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