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DIY Audio
Port Holes on Horn Walls
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<blockquote data-quote="Joris Wijgerde" data-source="post: 214736" data-attributes="member: 13728"><p>I'm definitely not an expert so please correct me if I'm mistaken but I have been building some synergies and most do indeed have reflex ports in the horn. This is different from mid injection ports as the location of injection ports are based the upper cutoff point of their passband. The reason for the spacing is twofold: for better summation and to keep the notch - created by sound waves that travel from the woofer to the apex of the horn (CD) and back - out of the mid's passband.</p><p></p><p>Since you want to keep the ports within 1/4WL of the upper cutoff point of their passband, anywhere down the length of the horn will do for a reflex port since the tuning is most likely way lower than an injection port. So in that case it would be preferred to put them close to the mouth of the horn to minimize diffraction, or in case the horn isn't large enough to provide loading at this frequency you could just place them outside of the horn.</p></blockquote><p></p>
[QUOTE="Joris Wijgerde, post: 214736, member: 13728"] I'm definitely not an expert so please correct me if I'm mistaken but I have been building some synergies and most do indeed have reflex ports in the horn. This is different from mid injection ports as the location of injection ports are based the upper cutoff point of their passband. The reason for the spacing is twofold: for better summation and to keep the notch - created by sound waves that travel from the woofer to the apex of the horn (CD) and back - out of the mid's passband. Since you want to keep the ports within 1/4WL of the upper cutoff point of their passband, anywhere down the length of the horn will do for a reflex port since the tuning is most likely way lower than an injection port. So in that case it would be preferred to put them close to the mouth of the horn to minimize diffraction, or in case the horn isn't large enough to provide loading at this frequency you could just place them outside of the horn. [/QUOTE]
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