{"id":236553,"date":"2021-12-28T16:43:54","date_gmt":"2021-12-28T15:43:54","guid":{"rendered":"http:\/\/tyxcisv.cluster031.hosting.ovh.net\/?p=236553"},"modified":"2025-09-18T19:12:46","modified_gmt":"2025-09-18T17:12:46","slug":"acoustic-bases-example","status":"publish","type":"post","link":"https:\/\/www.majorcom.fr\/en\/acoustic-bases-example\/","title":{"rendered":"Acoustics basics (PA calculation use-case)"},"content":{"rendered":"\n
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Acoustics basics (PA calculation use-case)<\/h1>\n<\/div>\n<\/div>\n
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Acoustic basics<\/h2>\n

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Public Address calculation example :<\/h3>\n

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For example, a outside space. This outdoor area is 10m wide and 32m long. The background of this space is 65 dB.<\/p>\n

The sound projector used in the first calculation is an IMPI IN 180T with a sensitivity of 94 dB 1w \/ 1m. Two power are available 8W \/ 15W and a directivity of 90 \u00b0.<\/p>\n<\/div>\n

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We chose to power the speaker at 8W. This gives us then :<\/p>\n

97dB 2W \/1m\n100dB 4W \/ 1m\n103dB 8W \/ 1m<\/strong><\/p>\n

Now if we calculate the pressure level at 32m knowing that we are outside, we have 103dB 8W\/ 1m :<\/p>\n

97dB 8W \/ 2m91dB 8W \/ 4m85dB 8W \/ 8m79dB 8W \/ 16m73dB 8W \/ 32m<\/strong><\/p>\n

The 73dB pressure level obtained at 8W at 32m and the level of background noise is 65dB, we have a difference of 6 dB who is insufficient to provide an adequate understanding of the message.<\/p>\n

If we now cable one sound projector IMPI 180T EN at 15W, you double the power and therefore is added 3dB which gives us 76dB 15W \/ 32m. Which is still insufficient for a proper understanding of the message.<\/p>\n

If we change this projector for one CH 532 with a sensitivity of 95dB 1W \/ 1m and a power of 30W, we obtain 110dB 30W \/ 1m and therefore 80 dB 30W \/ 32m<\/strong>.<\/p>\n

The difference with the background noise is 15 dB<\/strong>, which is sufficient for good intelligibility.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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MAJORCOM<\/h3>\n
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Expert in Public Address and Voice Alarm systems for the past 50 years.<\/p>\n<\/div>\n

See our Public Address solutions<\/a><\/div>\n
See our professional sound solutions<\/a><\/div>\n
See our Voice Alarm solutions<\/a><\/div>\n<\/div>\n<\/div>\n
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Our other documentation<\/span><\/h2>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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Installation advice and information<\/h3>\n
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Majorcom provide ranges of professional installation loudspeakers for indoor and outdoor PA applications \u2026<\/p>\n

Read more<\/a><\/p>\n<\/div>\n<\/div>\n

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How to measure a speaker line impedance<\/h3>\n
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Impedance is a measure of the opposition to the flow of an alternating current in a circuit; the aggregation of its resistance \u2026<\/p>\n

Read more<\/a><\/p>\n<\/div>\n<\/div>\n

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Omnidirectional speakers<\/h3>\n
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Recognized since 1992 and protected by an international patent, so far the omnidirectional speakers created by MAJORCOM \u2026<\/p>\n

Read more<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Acoustics basics (PA calculation use-case) Acoustic basics Public Address calculation example : For example, a outside space. This outdoor area […]<\/p>\n","protected":false},"author":17,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10721],"tags":[],"class_list":["post-236553","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nExample of sound system calculation | Acoustics - Majorcom<\/title>\n<meta name=\"description\" content=\"Acoustic basics: Example of sound system calculation | Let's take the example of an outdoor space to be soundproofed. 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