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<blockquote data-quote="SMUAlien" data-source="post: 395778" data-attributes="member: 552557">I do most of my thesis research on Microwave Impedance matching structures in microstrip and the same thing applies here.&nbsp; The impedance (real and reactance) of a load can change the resonant points of all the resonators in the entire structure.&nbsp; Resonant points are placed to create a certain frequency response for a specific load, if the load is changed the frequency response usually changes as well.&nbsp; Like you described this can cause a shift but can also have the effect of reflecting energy and creating a standing wave ratio.I figured that this would be the case but I honestly had no clue about the real and reactive characteristics of today&#039;s modern tweeters.&nbsp; I figured that since they were all designed with a car audio implementaion in mind at 4Ohm impedance, they would PROBALLY have similar real and reactive components.&nbsp; I didn&#039;t really even think of sensitivity matching.&nbsp; If I remember correctly&nbsp; every 3dB of sensitivity means another 50% increase in efficency.&nbsp; So something of 92dB has 50% of the remaining energy being used than something at 89dB.&nbsp; It&#039;s late and I probally got that wrong.Thanks for your help, I guess I&#039;ll just have to sell my M661&#039;s and get a complete setup that has a tweeter I can live with.&nbsp; Cost wise this seems like the most effective thing to do rather than just buying new silk tweeters from Diamond.</blockquote>

[QUOTE="SMUAlien, post: 395778, member: 552557"] I do most of my thesis research on Microwave Impedance matching structures in microstrip and the same thing applies here. The impedance (real and reactance) of a load can change the resonant points of all the resonators in the entire structure. Resonant points are placed to create a certain frequency response for a specific load, if the load is changed the frequency response usually changes as well. Like you described this can cause a shift but can also have the effect of reflecting energy and creating a standing wave ratio. I figured that this would be the case but I honestly had no clue about the real and reactive characteristics of today's modern tweeters. I figured that since they were all designed with a car audio implementaion in mind at 4Ohm impedance, they would PROBALLY have similar real and reactive components. I didn't really even think of sensitivity matching. If I remember correctly every 3dB of sensitivity means another 50% increase in efficency. So something of 92dB has 50% of the remaining energy being used than something at 89dB. It's late and I probally got that wrong. Thanks for your help, I guess I'll just have to sell my M661's and get a complete setup that has a tweeter I can live with. Cost wise this seems like the most effective thing to do rather than just buying new silk tweeters from Diamond. [/QUOTE]

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