"Acoustic" and "acoustical" are both used as adjectives, and both are used often in combinations such as "acoustical engineering", "acoustic energy", "acoustic model", etcetera. Some of these combinations sound better than others, e.g. "acoustical energy" sounds wrong to me, but that may be purely subjective.

Is there any difference in meaning between the words? Or might it just be a UK/US English difference?

  • "Acoustic" has to do with sound. "Acoustical" has to do with the tile on the ceiling. – Hot Licks Aug 9 '16 at 12:16
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    I'm not saying I disagree, but can you be more specific? What about e.g. "acoustic(al) engineering", where does this go in your 'definition'? – Yellow Aug 9 '16 at 12:34
  • "Acoustical" generally refers to the art/science/practice of suppressing unwanted echos and the like. – Hot Licks Aug 9 '16 at 13:33

The Acousical Society of America pondered this question for years before including definitions and usage rules in a 1955 update to their glossary of acoustical terms.

A report of the discussion is here. http://scitation.aip.org/content/asa/journal/jasa/27/5/10.1121/1.1908102

Their work was not 100 percent satisfactory, but it has remained generally in effect in America. They admit they cribbed their definitions from the electric/electrical definitions in American Standard Definitions of Electrical Terms (1941). The current Glossary costs $150 to buy, Maybe someone with access to an engineering library can check it out.

  • This is splendid, thanks! I do have access and I think the following definition should not be copyrighted: Acoustic, acoustical: The qualifying adjectives acoustic and acoustical mean containing, producing, arising from, actuated by, related to, or associated with sound. Acoustic is used when the term being qualified designates something that has the properties, dimensions, or physical characteristics associated with sound waves; acoustical is used when the term being qualified does not designate explicitly something which has such properties, dimensions or physical characteristics. – Yellow Aug 10 '16 at 16:06

The only material differences that I can see are that "acoustic" can be used as a noun as well as an adjective, whereas "acoustical" is only adjectival. The usage of "acoustical" is also more common in N America than other English speaking countries.

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