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TH118vsSB1000z
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<blockquote data-quote="Art Welter" data-source="post: 88303" data-attributes="member: 52"><p>Re: TH118vsSB1000z</p><p></p><p></p><p>For a passive radiator to radiate passively, it has to move. </p><p>Shorting the speaker effectively "puts the brakes" on the cones, eliminating the peaks and dips that are apparent if they are left unshorted. Both cabinets use strong motors that are very effective in stopping cone movement, low BL speakers as used in some home stereo cabinets would be less so.</p><p>I have posted some results on DIY audio on the subject, unfortunately seem to have deleted the screenshots after posting, but the shorted cabinet basically became a box.</p><p></p><p>The adjacent shorted cabinet does provide a larger frontal area than a single, which makes for more forward directivity, which in Brandon's test would increase the output level of both cabinets.</p><p>The slightly smaller frontal area of the SB1000 would derive slightly more benefit from the larger frontal area of the TH-118, but the difference would be probably less than .5 dB out of a 1.5 dB gain.</p><p></p><p>Ideally, the tests would have been outdoors at a greater distance(like 10 meters) with no objects within a couple wavelengths at the lowest frequency of interest (like 25 meters) but you gets what you gets.</p><p></p><p>At least this test was a lot more fair than at the DSL shootout where Brandon realized later that one of the SB1000 cones was undriven, that makes an adjacent un-shorted sub look like nothing, an example using a different band pass cabinet here:</p><p></p><p><a href="http://soundforums.net/attachments/varsity/6257d1363113653-danley-sm80-others-shootout-monday-january-14-danley-gainesville-ga-bowtievarious.png.att" target="_blank">http://soundforums.net/attachments/varsity/6257d1363113653-danley-sm80-others-shootout-monday-january-14-danley-gainesville-ga-bowtievarious.png.att</a></p><p></p><p>The upper white trace is the BP sub "normal" (both cones operational), the purple shows one side undriven, green one side undriven and shorted.</p><p>The differences are not subtle.</p><p></p><p>Art</p></blockquote><p></p>
[QUOTE="Art Welter, post: 88303, member: 52"] Re: TH118vsSB1000z For a passive radiator to radiate passively, it has to move. Shorting the speaker effectively "puts the brakes" on the cones, eliminating the peaks and dips that are apparent if they are left unshorted. Both cabinets use strong motors that are very effective in stopping cone movement, low BL speakers as used in some home stereo cabinets would be less so. I have posted some results on DIY audio on the subject, unfortunately seem to have deleted the screenshots after posting, but the shorted cabinet basically became a box. The adjacent shorted cabinet does provide a larger frontal area than a single, which makes for more forward directivity, which in Brandon's test would increase the output level of both cabinets. The slightly smaller frontal area of the SB1000 would derive slightly more benefit from the larger frontal area of the TH-118, but the difference would be probably less than .5 dB out of a 1.5 dB gain. Ideally, the tests would have been outdoors at a greater distance(like 10 meters) with no objects within a couple wavelengths at the lowest frequency of interest (like 25 meters) but you gets what you gets. At least this test was a lot more fair than at the DSL shootout where Brandon realized later that one of the SB1000 cones was undriven, that makes an adjacent un-shorted sub look like nothing, an example using a different band pass cabinet here: [url]http://soundforums.net/attachments/varsity/6257d1363113653-danley-sm80-others-shootout-monday-january-14-danley-gainesville-ga-bowtievarious.png.att[/url] The upper white trace is the BP sub "normal" (both cones operational), the purple shows one side undriven, green one side undriven and shorted. The differences are not subtle. Art [/QUOTE]
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