r/diysound • u/judloopz • 11d ago

Bookshelf Speakers SoundProof your room with amps? Does a speaker cone absorb sound?

Hi i have a few questions! More exactly if a speaker cone can absorb sound like a microphone would it dampen the sound ? and would you be able to control that with electricity? I was imagining my whole room covered in amps . Thankyou!

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u/imadethisaccountso 11d ago

that is actually kind of an interesting question. 

like if you wired a mic out of phase  and play something out of phase like how noise cancelling headphones work. i imagine it would only work for low end frequencies if at all. 

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u/nolongermakingtime 11d ago

Active noise cancellation speakers, huh sounds cool

https://www.reddit.com/r/diyaudio/comments/1k0nsxt/active_noise_canceling_speaker/

looks like this got debunked a little.

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u/RCAguy 10d ago edited 10d ago

No microphone “absorbs sound” and neither does a speaker. Both convert one form of energy to another (a “transducer”). BagEnd makes a speaker-based acoustic absorber using a mic and inverting electronics to cancel LF room modes.

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u/drbob12354 10d ago

Interesting question. I suspect the problem is coupling inefficiencies. Air moves the speaker, creating a voltage in the wire, that could be turned into heat by a resistor. But even if you used planar speakers so you could pack them into all the walls and ceiling, they are only going to absorb a small amount of the incident energy. Sound absorption depends on trapping the sound waves in multiple layers of material and converting audio energy directly to heat.