MariuszZ Posted September 26 Share Posted September 26 Hello, I am a happy owner of H3 but after measuring room response (REW) I have a technical question regarding polarity of speaker drivers. Is the reverse polarity of the midrange driver an intentional action by the designer? From the measurements it appears that at the crossover frequency it is deep. After changing the polarity of the midrange, this depth disappears but a smaller one appears at a lower frequency. After taking the REW measurement from a smaller distance from the speaker, two depths are visible at the measurement frequencies, which indicates incorrect polarity of the midrange. I noticed similar deep at the crossover frequency (5kHz) in the Cornwall III measurements. Does anyone know why the polarity was reversed in the H3 and whether it is intentional? What does such a procedure do? The crossover diagram corresponds to what I have in the H3. Thank you in advance for sharing your opinions and advice Regards. Mariusz Quote Link to comment Share on other sites More sharing options...
mboxler Posted September 27 Share Posted September 27 I’d be interested in what SPL and Phase plots show around those frequencies. Quote Link to comment Share on other sites More sharing options...
MariuszZ Posted September 27 Author Share Posted September 27 I don't know if the measurements will be useful for you. Measurement using REW with UMIK-1, quasi-anechoic from a distance of 70 cm at the height of the midrange and 1 cm for the woofer. You can gate the measurement pulse and maybe you can get something out for you. "polarity mid ok tw ok" - it means that the wires are not changed. Just like in the original crossover diagram. "polarity mid rev tw ok" - it means that the polarity of the midrange wires has been reversed. "polarity tw rev mid ok" - it means that the polarity of the tweeter wires has been reversed. Link to measurements Link to measure room response Regards Quote Link to comment Share on other sites More sharing options...
Deang Posted September 27 Share Posted September 27 Klipsch has no control over your room, test equipment, or test setups. All Klipsch speakers are tested in an anechoic chamber. They use elaborate software, test equipment, and trained engineers. Quote Link to comment Share on other sites More sharing options...
MariuszZ Posted September 28 Author Share Posted September 28 18 hours ago, Deang said: All Klipsch speakers are tested in an anechoic chamber. They use elaborate software, test equipment, and trained engineers. I have no doubt. I'm impressed with how well the H3s play music. My question is about the crossover and polarization of the midrange. Looking at the crossover iteration, you can see that there are different versions of it, but only one has a diagram published here on the forum. In my experience, there is a "deep" (deep trough on the amplitude characteristic) crossover frequency when there is no time coherence of the drivers. Why did experienced engineers leave this "deep" by reversing the polarity of the midrange driver? This is against the "art" of engineering but maybe there is a deeper thought behind it. I am trying to understand and decide whether to change the polarity or leave it. I do not hear any differences in the music played after the changes but I would like to know what the polarity should be in the context of technical correctness. Quote Link to comment Share on other sites More sharing options...
jcn3 Posted September 30 Share Posted September 30 On 9/26/2024 at 4:04 PM, MariuszZ said: Hello, I am a happy owner of H3 but after measuring room response (REW) I have a technical question regarding polarity of speaker drivers. Is the reverse polarity of the midrange driver an intentional action by the designer? From the measurements it appears that at the crossover frequency it is deep. After changing the polarity of the midrange, this depth disappears but a smaller one appears at a lower frequency. After taking the REW measurement from a smaller distance from the speaker, two depths are visible at the measurement frequencies, which indicates incorrect polarity of the midrange. I noticed similar deep at the crossover frequency (5kHz) in the Cornwall III measurements. Does anyone know why the polarity was reversed in the H3 and whether it is intentional? What does such a procedure do? The crossover diagram corresponds to what I have in the H3. Thank you in advance for sharing your opinions and advice Regards. Mariusz yes, inverting the polarity was an intentional act. there are quite a few examples of the polarity of the mid-horn and/or the tweeter being inverted -- particularly on the various heresys, fortes and cornwalls. it all depended on the parts that were available at the time and the characteristics of the parts. check this out: 1 Quote Link to comment Share on other sites More sharing options...
MariuszZ Posted October 1 Author Share Posted October 1 Thanks for directing my search. I found out that there are at least two H3 crossover diagrams, i.e. Rev-A and Rev-C. I have Rev-C and reverse polarity of the midrange. @net-david promised to check the polarity in his version but did not publish this information, and later the thread was blocked. Dawid, could you please add to this information? All I have to do is look for the Rev-A crossover diagram to find out what the polarity was. Regards. Quote Link to comment Share on other sites More sharing options...
MariuszZ Posted October 1 Author Share Posted October 1 Hello, I wrote earlier that my version is Rev-C but I checked and it turned out to be Rev-A crossover network. @Chief bonehead could you dispel my doubts regarding the polarity of the midrange in h3 with Rev-A crossover please? In the Rev-C version the polarity is reversed. I bought h3 but I don't know if the previous owner changed the wire connections to the drivers. Thank you in advance. Regards. Quote Link to comment Share on other sites More sharing options...
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