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Wiring a tweeter and mid
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<blockquote data-quote="keep_hope_alive" data-source="post: 8053697" data-attributes="member: 576029"><p>your amp will not see a 2 ohm load because you wired your mid and tweeter in parallel.</p><p></p><p>there are several reasons for this and it all comes down to the concept of impedance.</p><p></p><p>we say a speaker is "4 ohms" but that is just a nominal value. the actual impedance varies with frequency and 4 ohm is the minimum.</p><p></p><p>this is a 6.5" woofer</p><p></p><p><img src="http://i38.photobucket.com/albums/e128/phat_funky_beats/audio%20testing/OzAudio_CS180_2-1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>this is a 4" mid</p><p></p><p><img src="http://i38.photobucket.com/albums/e128/phat_funky_beats/audio%20testing/OzAudioMidrange01.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>this is a 1" tweeter</p><p></p><p><img src="http://i38.photobucket.com/albums/e128/phat_funky_beats/audio%20testing/OzAudio_tweeter01.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>the impedance of the larger woofer or mid rapidly increases at some point. when wired in parallel the amp sees only one speaker at a time - even if the woofer doesn't have a low pass filter.</p><p></p><p>here is another set of speakers - Eclpise 8971 component set</p><p></p><p>tweeter only</p><p></p><p><img src="http://i38.photobucket.com/albums/e128/phat_funky_beats/audio%20testing/Eclipse8971_WT3_tweeter.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>woofer only</p><p></p><p><img src="http://i38.photobucket.com/albums/e128/phat_funky_beats/audio%20testing/Eclipse8971_WT3_woofer.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>now let's look at what happens with a passive crossover (woofer and tweeter)</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>the filter network drives the impedance low around 5kHz to boost output. clearly, the woofer isn't playing a role here since it's impedance is 10 ohms at 5kHz.</p><p></p><p>now let's wire two component sets 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 let's compare wiring them 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>lastly, there is such little signal strength at high frequencies, a lower impedance is never a worry.</p></blockquote><p></p>
[QUOTE="keep_hope_alive, post: 8053697, member: 576029"] your amp will not see a 2 ohm load because you wired your mid and tweeter in parallel. there are several reasons for this and it all comes down to the concept of impedance. we say a speaker is "4 ohms" but that is just a nominal value. the actual impedance varies with frequency and 4 ohm is the minimum. this is a 6.5" woofer [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/audio%20testing/OzAudio_CS180_2-1.jpg[/IMG] this is a 4" mid [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/audio%20testing/OzAudioMidrange01.jpg[/IMG] this is a 1" tweeter [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/audio%20testing/OzAudio_tweeter01.jpg[/IMG] the impedance of the larger woofer or mid rapidly increases at some point. when wired in parallel the amp sees only one speaker at a time - even if the woofer doesn't have a low pass filter. here is another set of speakers - Eclpise 8971 component set tweeter only [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/audio%20testing/Eclipse8971_WT3_tweeter.jpg[/IMG] woofer only [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/audio%20testing/Eclipse8971_WT3_woofer.jpg[/IMG] now let's look at what happens with a passive crossover (woofer and tweeter) [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/audio%20testing/Eclipse8971_WT3_crossover.jpg[/IMG] the filter network drives the impedance low around 5kHz to boost output. clearly, the woofer isn't playing a role here since it's impedance is 10 ohms at 5kHz. now let's wire two component sets in parallel [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/audio%20testing/Eclipse8971_WT3_parallelcrossovers.jpg[/IMG] and let's compare wiring them in series [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/audio%20testing/Eclipse8971_WT3_seriescrossovers.jpg[/IMG] lastly, there is such little signal strength at high frequencies, a lower impedance is never a worry. [/QUOTE]
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