TFR1 Posted January 23, 2018 Share Posted January 23, 2018 Just a little help needed by this novice. Does the ohm rating of a speaker effect its performance characteristics? Will it change my crossover requirements? Speakers are K-42's Quote Link to comment Share on other sites More sharing options...
ClaudeJ1 Posted January 23, 2018 Share Posted January 23, 2018 Yes. Many speaker manufacturers, especially Klipsch, use 4 ohm woofer sections because they draw 3 db more power from the same amplifier to try and keep up with the more efficient horn drivers. Quote Link to comment Share on other sites More sharing options...
TFR1 Posted January 23, 2018 Author Share Posted January 23, 2018 @ClaudeJ1 So are you saying that I can not use K-42 woofers on my Super Heresy project and expect them to perform like jimjimbos? Jerry Quote Link to comment Share on other sites More sharing options...
jjptkd Posted January 23, 2018 Share Posted January 23, 2018 I've looked at almost all of the older Klipsch crossover schematics from speakers with differing woofer impedances form the Chorus 4 ohm drivers to the k-33 with 6 ohm driver, KP cabinets with 8 ohm woofers and Heresy's with 11 ohm woofers. Inductor ratings are anywhere from 2mh-4mh in seemingly random order and most just use a common 2.5mh. Klipsch pro subs, the KI-215 is rated at 8ohms with two woofers, I just purchased two of these when I cracked them open they have two 8ohm woofers wired in parallel which should work out to be 4ohms? There is no passive network in these. I noticed the KI-115 with a single 4ohm k-48 woofer is listed at 8 ohms as well? Where do they come up with these ratings? Quote Link to comment Share on other sites More sharing options...
JohnA Posted January 23, 2018 Share Posted January 23, 2018 1 hour ago, TFR1 said: Just a little help needed by this novice. Does the ohm rating of a speaker effect its performance characteristics? Will it change my crossover requirements? Speakers are K-42's The impedance most definitely will affect your crossover design. By itself, it will not affect a driver's performance. As stated above a lower impedance driver will draw more current at the same voltage. Since P=I*V, it will draw more power from the amp and produce more db at that voltage. You can use that to help match outputs from different drivers. Quote Link to comment Share on other sites More sharing options...
ClaudeJ1 Posted January 23, 2018 Share Posted January 23, 2018 38 minutes ago, TFR1 said: @ClaudeJ1 So are you saying that I can not use K-42 woofers on my Super Heresy project and expect them to perform like jimjimbos? Jerry No, because the original K-22 is an 11 ohm woofer. Just remember that ALL drivers have "rounded off" numbers for impedance, which varies greatly with frequency. Quote Link to comment Share on other sites More sharing options...
ClaudeJ1 Posted January 23, 2018 Share Posted January 23, 2018 17 minutes ago, jjptkd said: I've looked at almost all of the older Klipsch crossover schematics from speakers with differing woofer impedances form the Chorus 4 ohm drivers to the k-33 with 6 ohm driver, KP cabinets with 8 ohm woofers and Heresy's with 11 ohm woofers. Inductor ratings are anywhere from 2mh-4mh in seemingly random order and most just use a common 2.5mh. I concur with these findings, especially the 11 ohm characteristic of the older K-22's and their variations from different suppliers under the same "K-22" label. Quote Link to comment Share on other sites More sharing options...
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