Idea: dedicated woofer for 2.1 system. Opposing drivers to cancel vibrations.<\/p>\n\n\n\n
Kallax compartment is about 335x335x390mm. A 335x335mm baffle could just about fit an 8″ passive radiator and a 6.5″ driver, but it’s very close – 8″+5″ would be a better fit. Assuming 12mm plywood, internal volume using maximum dimensions is 3.11×3.11×3.66=35.4L. Subtracting driver volume, that’s about 34L cabinet.<\/p>\n\n\n\n
Let’s run some options in Hornresp (including max SPL, quarter space radiation)<\/p>\n\n\n\n Ok so assuming I can do some EQ in the low end to bring up the response, for the same money I can better just put in a pair of more powerful drivers and no passive radiators.<\/p>\n\n\n\n Looking at smaller drivers, I’m intrigued by a 2×5″ SB13PFC25-4 sub that could potentially do 91+ dB (quarter space) down to 30 Hz at xmax and would need less than 30W for it – at only 6.1L internal volume. That could fit in a 22cm cube, including space for a TPA3221 amplifier and a laptop charger to power it. But if I have the space in a Kallax compartment, 2×8″ SB20PFC30-4 looks great, much louder so probably cleaner at lower levels, and at Qtc of 0.75 should be relatively easy to EQ and crossover.<\/p>\n","protected":false},"excerpt":{"rendered":" Idea: dedicated woofer for 2.1 system. Opposing drivers to cancel vibrations. Kallax compartment is about 335x335x390mm. A 335x335mm baffle could just about fit an 8″ passive radiator and a 6.5″ driver, but it’s very close – 8″+5″ would be a better fit. Assuming 12mm plywood, internal volume using maximum dimensions is 3.11×3.11×3.66=35.4L. Subtracting driver volume, […]<\/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-1029","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\/1029","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=1029"}],"version-history":[{"count":6,"href":"https:\/\/invar.nl\/index.php?rest_route=\/wp\/v2\/posts\/1029\/revisions"}],"predecessor-version":[{"id":1050,"href":"https:\/\/invar.nl\/index.php?rest_route=\/wp\/v2\/posts\/1029\/revisions\/1050"}],"wp:attachment":[{"href":"https:\/\/invar.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1029"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/invar.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1029"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/invar.nl\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1029"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Driver (2x)<\/td> Drone (2x)<\/td> F3<\/td> F6<\/td> F12<\/td> SPL@35Hz<\/td> SPL@60Hz<\/td><\/tr> SB16PFCR25-4<\/td> SB20PFCR-00<\/td> 54 Hz<\/td> 42 Hz<\/td> 33 Hz<\/td> 100 dB<\/td> 110 dB<\/td><\/tr> Visaton W130X<\/td> SB20PFCR-00<\/td> 48 Hz<\/td> 33 Hz<\/td> 29 Hz<\/td> 97 dB<\/td> 103 dB<\/td><\/tr> Dayton DA135-8<\/td> SB20PFCR-00<\/td> 47 Hz<\/td> 37 Hz<\/td> 29 Hz<\/td> 95 dB<\/td> 101 dB<\/td><\/tr> W5-1138SMF<\/td> SB20PFCR-00<\/td> 46 Hz<\/td> 35 Hz<\/td> 29 Hz<\/td> 107 dB<\/td> 113 dB<\/td><\/tr> W5-1138SMF<\/td> none<\/td> 66 Hz<\/td> 46 Hz<\/td> 29 Hz<\/td> 101 dB<\/td> 110 dB<\/td><\/tr> SB20PFC30-4<\/td> none<\/td> 69 Hz<\/td> 54 Hz<\/td> 36 Hz<\/td> 104 dB<\/td> 113 dB<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n