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<blockquote data-quote="Guy Graham" data-source="post: 132247" data-attributes="member: 1944">Re: PK SoundThanks for that Art!It was interesting to re-read that thread again after many months. The purple trace is notably different with those two distinct dips not present in the other, much smoother lines. Am I right to understand you as stating that you expected the same measurement done with bass reflex cabinets would likely only have one dip in the curve of the equivalent measurement made with an unpowered and unshorted cabinet acting as a passive radiator, as the higher second dip in the purple line is caused by &quot;the secondary impedance peak&quot; that your tapped horn subs have?You estimate that the Fb parameter of Greg&#039;s subs could have been responsible for the lack of very low sub-bass during the PK event, based on your own measured evidence that indicates a correlation with box tuning frequencies and interaction of this type. Seeing how they were used as stands, between the subs and the tops - is it likely that the frequency response of those tops could also have been affected, or do you not have sufficient information to make an educated estimate there?I appreciate the effort and thorough answers already provided to my often technically illiterate, clumsily worded queries.</blockquote>

[QUOTE="Guy Graham, post: 132247, member: 1944"] Re: PK Sound Thanks for that Art! It was interesting to re-read that thread again after many months. The purple trace is notably different with those two distinct dips not present in the other, much smoother lines. Am I right to understand you as stating that you expected the same measurement done with bass reflex cabinets would likely only have one dip in the curve of the equivalent measurement made with an unpowered and unshorted cabinet acting as a passive radiator, as the higher second dip in the purple line is caused by "the secondary impedance peak" that your tapped horn subs have? You estimate that the Fb parameter of Greg's subs could have been responsible for the lack of very low sub-bass during the PK event, based on your own measured evidence that indicates a correlation with box tuning frequencies and interaction of this type. Seeing how they were used as stands, between the subs and the tops - is it likely that the frequency response of those tops could also have been affected, or do you not have sufficient information to make an educated estimate there? I appreciate the effort and thorough answers already provided to my often technically illiterate, clumsily worded queries. [/QUOTE]

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