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Low Earth Orbit
DIY Audio
An old project, newly found, on a sad day
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<blockquote data-quote="Art Welter" data-source="post: 206727" data-attributes="member: 52"><p>Kevin,</p><p></p><p>In my "wooden" 2009 iteration of Phil's Resopump design using a LAB 10" (HL something or other, discontinued AFAIK), I found it to "sound" like a 6th order bandpass box, a narrow pass band followed by a rapid phase shift and upper "hole". Phil & Loren's 2012 design seems to functionally be the same, though eyeballing the path length the pass band would be around an octave lower.</p><p></p><p>In an outdoor A/B listening test with a tiny bass reflex box with a LAB 12 and the Resopump both equalized to the same response in a narrow bandpass, my subjective "take away" was the Resopump sounded "muddy", upright bass notes were hard to tell apart, a classic "one note wonder". That said, with bass that was mixed "boomy" and "drone like" (hip hop stuff), hard to tell much difference in sound, other than the greater "boom" factor of the Resopump, which leveraged the output of a 10" to near that of an 18" in a very compact package.</p><p></p><p>Having done several tapped horn designs, I find (if properly done) they sound more like a FLH (front loaded horn) than a 6th order bandpass. Since it has been something like 40 years since I have listened to a "scoop" with any interest, with a grain of salt I'd say they are kind of "in between" a TH and a 6th order bandpass.</p><p></p><p>That said, there are a myriad of designs that are all across the gamut of transmission lines, BLH, TH, Scoops, etc.</p><p>Every dog has it's own fleas...</p><p></p><p>Art</p></blockquote><p></p>
[QUOTE="Art Welter, post: 206727, member: 52"] Kevin, In my "wooden" 2009 iteration of Phil's Resopump design using a LAB 10" (HL something or other, discontinued AFAIK), I found it to "sound" like a 6th order bandpass box, a narrow pass band followed by a rapid phase shift and upper "hole". Phil & Loren's 2012 design seems to functionally be the same, though eyeballing the path length the pass band would be around an octave lower. In an outdoor A/B listening test with a tiny bass reflex box with a LAB 12 and the Resopump both equalized to the same response in a narrow bandpass, my subjective "take away" was the Resopump sounded "muddy", upright bass notes were hard to tell apart, a classic "one note wonder". That said, with bass that was mixed "boomy" and "drone like" (hip hop stuff), hard to tell much difference in sound, other than the greater "boom" factor of the Resopump, which leveraged the output of a 10" to near that of an 18" in a very compact package. Having done several tapped horn designs, I find (if properly done) they sound more like a FLH (front loaded horn) than a 6th order bandpass. Since it has been something like 40 years since I have listened to a "scoop" with any interest, with a grain of salt I'd say they are kind of "in between" a TH and a 6th order bandpass. That said, there are a myriad of designs that are all across the gamut of transmission lines, BLH, TH, Scoops, etc. Every dog has it's own fleas... Art [/QUOTE]
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