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Looking to replace tweets
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<blockquote data-quote="keep_hope_alive" data-source="post: 7504828" data-attributes="member: 576029"><p>this plot is an excellent example of why running active is preferred. notice the impedance spike at 2kHz. this will affect the crossover point since the crossover point varies with load impedance. this is true for all speakers with passive crossovers. as a general rule, you want the xover point at least an octave or more above the fs of the driver. running active eliminates this issue.</p><p></p><p>note that an octave above is a doubling of frequency. so for this tweeter, a passive crossover point would be preferred around 4kHz. if I have a 12dB/oct slope that is centered at 4kHz, i can expect to be 12dB down at 2kHz.</p><p></p><p>here is a different tweeter, an ID NX-30</p><p></p><p><img src="http://i38.photobucket.com/albums/e128/phat_funky_beats/audio%20testing/IDNX30_1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>the cool thing about the Woofer Tester is that it can also sweep with the passive crossover in-line.</p><p></p><p>here is an Eclipse 8971 component coaxial speaker (has separate crossover but tweeter is mounted in the pole piece)</p><p></p><p>this is with the passive crossover:</p><p></p><p><img src="http://i38.photobucket.com/albums/e128/phat_funky_beats/audio%20testing/Eclipse8971_WT3_crossover.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>now, if we connect two speakers and crossovers in parallel:</p><p></p><p><img src="http://i38.photobucket.com/albums/e128/phat_funky_beats/audio%20testing/Eclipse8971_WT3_parallelcrossovers.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>and if we connect two speakers and crossovers in series:</p><p></p><p><img src="http://i38.photobucket.com/albums/e128/phat_funky_beats/audio%20testing/Eclipse8971_WT3_seriescrossovers.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>cool, eh?</p></blockquote><p></p>
[QUOTE="keep_hope_alive, post: 7504828, member: 576029"] this plot is an excellent example of why running active is preferred. notice the impedance spike at 2kHz. this will affect the crossover point since the crossover point varies with load impedance. this is true for all speakers with passive crossovers. as a general rule, you want the xover point at least an octave or more above the fs of the driver. running active eliminates this issue. note that an octave above is a doubling of frequency. so for this tweeter, a passive crossover point would be preferred around 4kHz. if I have a 12dB/oct slope that is centered at 4kHz, i can expect to be 12dB down at 2kHz. here is a different tweeter, an ID NX-30 [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/audio%20testing/IDNX30_1.jpg[/IMG] the cool thing about the Woofer Tester is that it can also sweep with the passive crossover in-line. here is an Eclipse 8971 component coaxial speaker (has separate crossover but tweeter is mounted in the pole piece) this is with the passive crossover: [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/audio%20testing/Eclipse8971_WT3_crossover.jpg[/IMG] now, if we connect two speakers and crossovers in parallel: [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/audio%20testing/Eclipse8971_WT3_parallelcrossovers.jpg[/IMG] and if we connect two speakers and crossovers in series: [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/audio%20testing/Eclipse8971_WT3_seriescrossovers.jpg[/IMG] cool, eh? [/QUOTE]
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