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Do speakers function as absorbers?
Old 13th August 2020
Do speakers function as absorbers?

I may be missing something obvious, please let me know.

I was just looking at my old Sony floor standers and thinking... hmm. Those speaker baskets are heavy, but they move freely... they’re impeded by their weight and the magnet that want them to be at rest...

...and aside from the ports, that box is mostly sealed...

... it’s probably lined with some sort of insulation...

... so it must function as a helmholtz resonator to some degree.

It’s sides are rigid and fairly dense. The baffle and back panel probably vibrate too since it’s a pretty cheap speaker, so if you sealed the ports or replaced one of the panels would it act like a dampened membrane?

So does a passive speaker that’s off in a room have a measurable acoustic function?
Old 13th August 2020
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akebrake's Avatar

Originally Posted by Grovestand View Post
So does a passive speaker that’s off in a room have a measurable acoustic function?
To some degree. It's a small area.
More speakers means more trapping like a HiFi shop with a wall of speakers

This paper is about using this idea to tune freq and change Q of a speaker membrane. (e.g look at page 69 )

Old 13th August 2020
Wow.... of course it has already been done, but it is encouraging to me and my understanding of acoustics that my brain came up with the idea... even if it’s not a new idea.

I suppose crappy old speaker boxes with the baffles removed could be a fairly easy way to make tuned traps... and introduce pests to your studio at the same time!
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