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selenium tweeters and bass blockers
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<blockquote data-quote="keep_hope_alive" data-source="post: 8205333" data-attributes="member: 576029"><p>the reason bass blockers or passive crossovers need to be made to the speaker's impedance is because that affects the crossover point.</p><p></p><p>for a simple 6dB/oct crossover:</p><p></p><p>a 4 ohm crossover would behave 2x as high if wired to a 8 ohm tweeter (crossover frequency is doubled when speaker impedance is doubled)</p><p></p><p>the real danger comes when using an 8 ohm crossover on a 4 ohm tweeter because the crossover frequency is halved.</p><p></p><p><img src="http://images.fieroforum.com/pffimages2/capacitor_inductor_values.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>with higher-order crossovers the effect is worse because values move in opposite directions</p><p></p><p><img src="http://johnkvintageguitars.homestead.com/crossover_chart-600.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="keep_hope_alive, post: 8205333, member: 576029"] the reason bass blockers or passive crossovers need to be made to the speaker's impedance is because that affects the crossover point. for a simple 6dB/oct crossover: a 4 ohm crossover would behave 2x as high if wired to a 8 ohm tweeter (crossover frequency is doubled when speaker impedance is doubled) the real danger comes when using an 8 ohm crossover on a 4 ohm tweeter because the crossover frequency is halved. [IMG]http://images.fieroforum.com/pffimages2/capacitor_inductor_values.jpg[/IMG] with higher-order crossovers the effect is worse because values move in opposite directions [IMG]http://johnkvintageguitars.homestead.com/crossover_chart-600.jpg[/IMG] [/QUOTE]
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