Assertion: speaker's frequency response | /r/HasProperty | adjusted by subtraction
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text: Some parameters, such as reverberation time (in any case, really applicable only to larger volumes), and overall room "frequency response" can be somewhat adjusted by addition or subtraction of reflecting, diffusing, or absorbing elements, but, though this can be remarkably effective (with the right additions or subtractions and placements), it remains something of an art and a matter of experience.