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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: 212841" data-attributes="member: 652"><p>This is what I do with the Lake:-</p><p></p><p>1) I flatten the amplitude response of drivers with in-band PEQs as much as possible. I try to do this so that it is flat at least half an octave past the crossover point. With the 4594 and the VHF crossover this is not possible as the low section will struggle to go above 6K3 and the high section will struggle go below 6K3 - you just need a sensible compromise and if you are using brick wall crossovers its not that important what happens out of band.</p><p></p><p>2) Then I use all-pass filters to flatten the phase of each pass band ... this can be a difficult to do. There is a limit to how low you can flatten the phase without introducing too much latency when used to live music – I try get it reasonably flat from about 200Hz up.</p><p></p><p>3) Then I adjust the delay times of each band so that they are all time aligned, and set the levels for each pass band.</p><p></p><p>4) Next I adjust the crossover frequencies to where I want them and use either a brick wall FIR or 24dB linear phase crossover with LR slopes. The 24 dB curve is use on the PM90/60 mids as it results in better pattern control through the crossover region.</p><p></p><p>5) With the Lake I can then use the system PEQ which uses raised cosine filter to tweak the finial result.</p></blockquote><p></p>
[QUOTE="Peter Morris, post: 212841, member: 652"] This is what I do with the Lake:- 1) I flatten the amplitude response of drivers with in-band PEQs as much as possible. I try to do this so that it is flat at least half an octave past the crossover point. With the 4594 and the VHF crossover this is not possible as the low section will struggle to go above 6K3 and the high section will struggle go below 6K3 - you just need a sensible compromise and if you are using brick wall crossovers its not that important what happens out of band. 2) Then I use all-pass filters to flatten the phase of each pass band ... this can be a difficult to do. There is a limit to how low you can flatten the phase without introducing too much latency when used to live music – I try get it reasonably flat from about 200Hz up. 3) Then I adjust the delay times of each band so that they are all time aligned, and set the levels for each pass band. 4) Next I adjust the crossover frequencies to where I want them and use either a brick wall FIR or 24dB linear phase crossover with LR slopes. The 24 dB curve is use on the PM90/60 mids as it results in better pattern control through the crossover region. 5) With the Lake I can then use the system PEQ which uses raised cosine filter to tweak the finial result. [/QUOTE]
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New DIY Mid High (90deg) - AKA PM90
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