Thinking of designing a plug for my 2×6″ horn reflex bass cabinet, so I can use it as a closed cabinet subwoofer in a 2.1 system with software EQ.<\/p>\n\n\n\n
Checking Hornresp, if I plug the end of the horns, I get a closed cabinet with a Qtc of 0.70. Max SPL (quarter space):<\/p>\n\n\n\n That’s actually a useful level, I think? Max SPL is mostly independent of volume so I don’t have to think too much about the shape of the plug(s), driver volume etc. It would however need a lot of EQ to get some bass out the 12db\/oct declining response. Actually a 2nd order low pass at 30 Hz might already give a decent response as well as could function as a 2nd order crossover around 150 Hz? Phase is then -90 degrees around 150 Hz, might have to reverse polarity.<\/p>\n\n\n\n Let’s look at power. Assuming the above active EQ, and aiming for max excursion at 30Hz, power requirement would be 60W total into 4W. A TPA3116D2 or TPA3221 module according to their datasheets should be able to reach that at 24V, but without headroom – a TPA3255 module >32V might be a better fit. Or TPA3223\/TPA3250\/TPA3251 at 32-36V.<\/p>\n\n\n\n <\/p>\n","protected":false},"excerpt":{"rendered":" Thinking of designing a plug for my 2×6″ horn reflex bass cabinet, so I can use it as a closed cabinet subwoofer in a 2.1 system with software EQ. Checking Hornresp, if I plug the end of the horns, I get a closed cabinet with a Qtc of 0.70. Max SPL (quarter space): Original Closed […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12,41],"tags":[],"class_list":["post-1031","post","type-post","status-publish","format-standard","hentry","category-audio","category-uncat-audio"],"_links":{"self":[{"href":"https:\/\/invar.nl\/index.php?rest_route=\/wp\/v2\/posts\/1031","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/invar.nl\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/invar.nl\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/invar.nl\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/invar.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1031"}],"version-history":[{"count":3,"href":"https:\/\/invar.nl\/index.php?rest_route=\/wp\/v2\/posts\/1031\/revisions"}],"predecessor-version":[{"id":1035,"href":"https:\/\/invar.nl\/index.php?rest_route=\/wp\/v2\/posts\/1031\/revisions\/1035"}],"wp:attachment":[{"href":"https:\/\/invar.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1031"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/invar.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1031"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/invar.nl\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1031"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}<\/td> Original<\/td> Closed 16L<\/td><\/tr> 30 Hz<\/td> 74 dB<\/td> 90 dB<\/td><\/tr> 40 Hz<\/td> 85 dB<\/td> 95 dB<\/td><\/tr> 50 Hz<\/td> 94 dB<\/td> 99 dB<\/td><\/tr> 60 Hz<\/td> 102 dB<\/td> 102 dB<\/td><\/tr> 100 Hz<\/td> 126 dB<\/td> 111 dB<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n