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<blockquote data-quote="Ivan Beaver" data-source="post: 132166" data-attributes="member: 30"><p>Re: PK Sound</p><p></p><p></p><p>How could they possibly add? In order to add-there has to be some kind of "active" element. That does not mean amplifiers or even speakers-but things like walls can act as horns when the loudspeaker is properly placed. "barn doors" or extension flares have been very common over the years for subs-and they are nothing but sheets of plywood-but they are placed in the proper position to help load the low freq horn.</p><p></p><p>When they subtract they are acting as a tuned chamber and basically "absorbing" at the tuned freq.</p><p></p><p>It is not like combfiltering in which you get up to 3dB addition at some freq and "complete cancellation" at other freq. Because with combfiltering you have 2 active elements.</p></blockquote><p></p>
[QUOTE="Ivan Beaver, post: 132166, member: 30"] Re: PK Sound How could they possibly add? In order to add-there has to be some kind of "active" element. That does not mean amplifiers or even speakers-but things like walls can act as horns when the loudspeaker is properly placed. "barn doors" or extension flares have been very common over the years for subs-and they are nothing but sheets of plywood-but they are placed in the proper position to help load the low freq horn. When they subtract they are acting as a tuned chamber and basically "absorbing" at the tuned freq. It is not like combfiltering in which you get up to 3dB addition at some freq and "complete cancellation" at other freq. Because with combfiltering you have 2 active elements. [/QUOTE]
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