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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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Re: And you are describing an ancient technology

Posted by Steve Eddy on November 21, 2006 at 13:34:47:

However, this is really a form of tone control. As you are amping by sympathetic resonance only a narrow band of frequencies, you are making a peak there and in its harmonics...
That's incorrect. At the device's resonant frequency, it's not amplifying. It's doing just the opposite, it's absorbing. It's like a notch filter. The less lossy the resonator, i.e. the higher the Q of the resonance, the greater the absorption and the narrower the bandwidth of the absorption. Conversely, with a more lossy resonator and a lower Q, the less the absorption and the wider the bandwidth.
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