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Enclosure Design & Construction
bandpass vs. sealed
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<blockquote data-quote="ChefJoe" data-source="post: 147174" data-attributes="member: 546209"><p>Sigh, ok, find some speaker specs, go to <a href="http://www.linearteam.dk" target="_blank">http://www.linearteam.dk</a> &gt;isdonline &gt;new driver and use their on-line calculator to find the optimal bandpass, ported, and sealed boxes.... look at the little diagram that does frequency vs level. What you'll see is that the proper bandpass box is a little louder at lower freqencies than the other types of boxes... and cuts off at higher frequencies (which would, in theory be great... less interference noise). The sad thing is when you adjust the volume of the front chamber, the volume of the back chamber, or even the frequency of the box by less than 10% (yeah, that's not much when you're talking about a .6 cft space) you can redraw the line and see the level goes all wavy at the top (not what we want, flat response throughout the range you want to reproduce is desired in speakers). By adjusting all the levels by less than 10%, I was able to get the 50-60 hz range to jump by 3 db (which is a little more than doubled) at the expense of the low end response. this is why they're incredibly tricky to build.</p><p></p><p>Bandpass relies on frequency cancellation to get an even response, if you're off just a little bit, the cancellation doesn't work out even, and you're screwed. I'm about to ditch my crappy bestbuy bandpass box in favor of ported (sigh, the things I did in high school).</p></blockquote><p></p>
[QUOTE="ChefJoe, post: 147174, member: 546209"] Sigh, ok, find some speaker specs, go to [URL="http://www.linearteam.dk"]http://www.linearteam.dk[/URL] >isdonline >new driver and use their on-line calculator to find the optimal bandpass, ported, and sealed boxes.... look at the little diagram that does frequency vs level. What you'll see is that the proper bandpass box is a little louder at lower freqencies than the other types of boxes... and cuts off at higher frequencies (which would, in theory be great... less interference noise). The sad thing is when you adjust the volume of the front chamber, the volume of the back chamber, or even the frequency of the box by less than 10% (yeah, that's not much when you're talking about a .6 cft space) you can redraw the line and see the level goes all wavy at the top (not what we want, flat response throughout the range you want to reproduce is desired in speakers). By adjusting all the levels by less than 10%, I was able to get the 50-60 hz range to jump by 3 db (which is a little more than doubled) at the expense of the low end response. this is why they're incredibly tricky to build. Bandpass relies on frequency cancellation to get an even response, if you're off just a little bit, the cancellation doesn't work out even, and you're screwed. I'm about to ditch my crappy bestbuy bandpass box in favor of ported (sigh, the things I did in high school). [/QUOTE]
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bandpass vs. sealed
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