{"id":3122,"date":"2015-11-12T13:41:20","date_gmt":"2015-11-12T11:41:20","guid":{"rendered":"http:\/\/www.tonmeister.ca\/wordpress\/?p=3122"},"modified":"2018-05-29T07:55:54","modified_gmt":"2018-05-29T05:55:54","slug":"bo-tech-intuitive-directivity-plots-v-2","status":"publish","type":"post","link":"https:\/\/www.tonmeister.ca\/wordpress\/2015\/11\/12\/bo-tech-intuitive-directivity-plots-v-2\/","title":{"rendered":"B&O Tech: Intuitive Directivity Plots v.2"},"content":{"rendered":"

#48 in\u00a0a series of articles<\/a>\u00a0about the technology behind\u00a0Bang & Olufsen<\/a>\u00a0loudspeakers<\/strong><\/p>\n

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In a past\u00a0article<\/a>, I tried to come up with an intuitive way of representing the beam width (or “directivity” – if you’re a geek) of the BeoLab 90<\/a>. I realised after posting, that there is another way to do this which is used in loudspeaker reviews in\u00a0some magazines (mostly because it’s the way directivity is plotted\u00a0by MLSSA<\/a>). So, I’ve taken the same data as before, and re-plotted it using a “waterfall” function in Matlab. It’s just a different way of looking at the same information – but it might be helpful.<\/p>\n

If you’re curious about the details regarding the data itself, this is described here<\/a>.<\/p>\n

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\"Figure<\/a>
Figure 1: BeoLab 90 directivity vs. frequency as a “normal” three-way loudspeaker with the Beam Control disabled. (Note that this is not possible in a production model.)<\/figcaption><\/figure>\n

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\"Figure<\/a>
Figure 2: Directivity vs. frequency of BeoLab 90 in Narrow mode<\/figcaption><\/figure>\n

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 <\/p>\n

\"Figure<\/a>
Figure 3: Directivity vs. frequency of BeoLab 90 in Wide mode. Compare this to the BeoLab 5 plot, below. As can be seen here, the low frequency directivity (or beam width) is controlled to be the same as the mid and high frequency bands.<\/figcaption><\/figure>\n

 <\/p>\n

\"Figure<\/a>
Figure 4: BeoLab 5 directivity vs. frequency. As can be seen here, the Acoustic Lens ensures a constant directivity (meaning the same beam width at all frequencies) in the high end. However, the low frequency band is omnidirectional.<\/figcaption><\/figure>\n

 <\/p>\n

\"Figure<\/a>
Figure 5: Directivity vs. frequency of BeoLab 90 in Omni mode<\/figcaption><\/figure>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

#48 in\u00a0a series of articles\u00a0about the technology behind\u00a0Bang & Olufsen\u00a0loudspeakers   In a past\u00a0article, I tried to come up with an intuitive way of representing the beam width (or “directivity” – if you’re a geek) of the BeoLab 90. I realised after posting, that there is another way to do this which is used in […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[33,4,32,5],"tags":[],"class_list":["post-3122","post","type-post","status-publish","format-standard","hentry","category-acoustics","category-audio","category-bang-olufsen","category-loudspeakers"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p48hIM-Om","_links":{"self":[{"href":"https:\/\/www.tonmeister.ca\/wordpress\/wp-json\/wp\/v2\/posts\/3122","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tonmeister.ca\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tonmeister.ca\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tonmeister.ca\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tonmeister.ca\/wordpress\/wp-json\/wp\/v2\/comments?post=3122"}],"version-history":[{"count":3,"href":"https:\/\/www.tonmeister.ca\/wordpress\/wp-json\/wp\/v2\/posts\/3122\/revisions"}],"predecessor-version":[{"id":3137,"href":"https:\/\/www.tonmeister.ca\/wordpress\/wp-json\/wp\/v2\/posts\/3122\/revisions\/3137"}],"wp:attachment":[{"href":"https:\/\/www.tonmeister.ca\/wordpress\/wp-json\/wp\/v2\/media?parent=3122"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tonmeister.ca\/wordpress\/wp-json\/wp\/v2\/categories?post=3122"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tonmeister.ca\/wordpress\/wp-json\/wp\/v2\/tags?post=3122"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}