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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: 206319" data-attributes="member: 652"><p>Exactly – To keep the box size down the LF horn was folded with a mouth above and below the HF horn.</p><p></p><p>This impacted on the maximum operating frequency of the MF horn limiting it to around 700Hz. At high frequencies the bends would cause issues and the dipole exits would cause the vertical pattern to narrow too much and eventually some unwanted MF lobes would occur.</p><p></p><p>The problem was finding a horn and driver that would happily go that low and physically fit in a box that was small enough to be pole mounted.</p><p></p><p>This is one of the reasons the 4594 and HF950 were selected. I don’t know of any other commercially available horns or drivers that will work. Some of the new large format B&C, 18sound and RCF drivers may work but I have not tried them. In general the lowest recommended manufactures crossover frequency is around 800Hz for these drivers.</p><p></p><p>FWIW I cross my 90 degree boxes at 700Hz.</p></blockquote><p></p>
[QUOTE="Peter Morris, post: 206319, member: 652"] Exactly – To keep the box size down the LF horn was folded with a mouth above and below the HF horn. This impacted on the maximum operating frequency of the MF horn limiting it to around 700Hz. At high frequencies the bends would cause issues and the dipole exits would cause the vertical pattern to narrow too much and eventually some unwanted MF lobes would occur. The problem was finding a horn and driver that would happily go that low and physically fit in a box that was small enough to be pole mounted. This is one of the reasons the 4594 and HF950 were selected. I don’t know of any other commercially available horns or drivers that will work. Some of the new large format B&C, 18sound and RCF drivers may work but I have not tried them. In general the lowest recommended manufactures crossover frequency is around 800Hz for these drivers. FWIW I cross my 90 degree boxes at 700Hz. [/QUOTE]
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New DIY Mid High (90deg) - AKA PM90
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