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In Reply to: Re: tapped horns vs 1/4 wave length posted by tomservo on April 7, 2007 at 16:12:54:
When is size not limiting in subbass horns? The question would be at what size horn IS IT WORTH going with a regular horn vs a tapped horn for more efficiency? Would it be 1/2 lambda certainly it would not be the ideal = full size horn. Noticed four TH115s give 50% efficiency vs needed 6 lab subs to do the same. So hard to beat this design. No need to be so humble Tom!!
Follow Ups:
Hi Bill, NicolasThe Tapped horn IS sort of a free lunch so far as the bottom portion of a bass horns response is concerned. For a given size box and low corner, you can make more sound per Watt, per excursion limit this way.
Generally, one can get two octaves or more of reasonably flat response, which is normally enough for a woofer. Tapped horns do not generally go as far above the low cutoff as regular horns can but you can combine one with another “upper range” horn.
Below the quarter wave low cutoff, the roll off slope eventually reaches between 18 and 24 dB per octave slope, not as gradual as a sealed box, not as steep as a vented box.The TH215 while still smaller than a LAB sub, would be a better comparison as it has a lower corner F than the TH-115.
http://www.danleysoundlabs.com/pdf/Danley TH-215 Spec Sheet_r3.pdf
Best,Tom
In case Tom doesn't respond, there's still no such thing as a free lunch. A TH115 has higher sensitivity and smoother response within its passband than a Lab, but that passband is also much narrower. Add enough Labs and they'll be just as sensitive, with response just as flat, and they'll go an octave lower to boot. You get to full sensitivity with fewer TH115s, but they also won't go as low, no matter how many you use. It's all a matter of making specific compromises to achieve specific goals.
Agree Bill there is no fre lunch but still I hate to carry more cabs than necessary. Tapped horns are an easy built too and although Tom will/should get the patent for horns. It does not mean a few for personal use will hurt,
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