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quote: Originally posted by mdeneen: I'm trying to figure out what anybody (original poster?) means by "phase coherant" speaker? I am not aware of any loudspeaker, regardless of the number of drivers or crossover elements, which maintains a "uniform" phase angle relative to the input signal - if that is what you mean by "coherant." I am not aware of any specific definition. However, you are correct in your assumption of the premise. A "Phase coherent" speaker is one which maintains a uniform phase angle with respect to the input signal.(as you stated) Trying to accurately reproduce the input signal in both the frequency and time domains. This is the whole design philosophy behind such speaker companies as: Meadowlark (see: design philosophy at www.meadowlarkaudio.com), Thiel (see: www.theilaudio.com), and Vandersteen (see: www.vandersteen.com/pages/Cpny_info.htm) Here are 2 articles on the subject as well: 1)"http://www.stereophile.com/showarchives.cgi?221" <- without quotes 2)"http://www.soundstage.com/interviews/int07.htm" <-without quotes I'm interested to see what everyone thinks. mdeneen: I hope this helps to clear things up.....a little.

Thanks for your replys, guys. I'm still slightly confused.... I think that alignment of the acoustic centers makes sense: sounds generated by a tweeter & woofer at the same time will only reach your ear at the same time if the acoustic centers of the tweeter & woofer are aligned. Does anyone know if the horns & woofers are acoustically aligned in the Klipsch Legend series? Now, the crossover: If Peter was correct in his first post and you don't need a 1st order crossover in order to achieve a phase coherent speaker.....how is this done with higher order crossovers which (I have read) inherently introduce phase shifts? Reason for all these questions: I have heard the difference between phase coherent & incoherent speakers, and the difference is huge.(phase coherent being better, in my opinion) Klipsch speakers have been given good reviews, and their brochure for the KLF-30s say they are phase coherent. However, the criteria that I have dug up about what makes a phase coherent speaker a phase coherent speaker (outlined in my first post) is not evident in the Klipsch literature. So I'm wondering how they are doing it. I just want to know what I'm talking about before I go spending any money!!

Hi, I'm new here, (and to the "high-end" audio scene as well) & I had a question regarding Klipsch speakers. From my research, looking at sites like Meadowlarkaudio.com, thielaudio.com, and a few online audio publications, it seems as though the use of a slanted baffle (to align the acoustic centers of the drivers), and a 1st order crossover are necessary to produce truely phase coherent sound. I have been looking at the Klipsch KLF-30s or -20s and I was wondering 2 things: 1) Is the information that I have gathered so far accurate? 2) Does Klipsch employ these techniques in the construction of their speakers? Thanks for any input you can give.