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Low Earth Orbit
DIY Audio
Thoughts/ideas on a 21" ported horn sub
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<blockquote data-quote="Carl Klinkenborg" data-source="post: 212421" data-attributes="member: 12770"><p>In my mind, this design combines the common problem of both horn and ported enclosures - energy storage. The step response will be extremely poor, as is every enclosure type compared with sealed. A design such as the Othorn is still ringing significantly at 50ms, whereas a typical sealed loading is all done by about 10ms or less. Extremely poor transient response may not be significant to your sound requirements...</p><p>A port area of 316cm2 is impossibly small for a driver of this displacement and will produce significant distortion and output compression. A very well-respected designer I used to work with always started with a port area equal to the effective cone area and compromised backwards from this figure.</p><p>Having said all this, it's still well worth a couple of sheets of board and a weekend's work!</p></blockquote><p></p>
[QUOTE="Carl Klinkenborg, post: 212421, member: 12770"] In my mind, this design combines the common problem of both horn and ported enclosures - energy storage. The step response will be extremely poor, as is every enclosure type compared with sealed. A design such as the Othorn is still ringing significantly at 50ms, whereas a typical sealed loading is all done by about 10ms or less. Extremely poor transient response may not be significant to your sound requirements... A port area of 316cm2 is impossibly small for a driver of this displacement and will produce significant distortion and output compression. A very well-respected designer I used to work with always started with a port area equal to the effective cone area and compromised backwards from this figure. Having said all this, it's still well worth a couple of sheets of board and a weekend's work! [/QUOTE]
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Thoughts/ideas on a 21" ported horn sub
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