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Hpf with passive components
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<blockquote data-quote="zinda" data-source="post: 8038344" data-attributes="member: 633054"><p>From what you have said here it's still kinda fuzzy as to what exactly you are asking, but , I can say that if you are using passive xovers on your tweeters it makes no difference where your (active) amp xover is set, since the passive crossovers will block any low sounds from passing through to the tweets. Good quality tweeters are generally pretty durable if used with the supplied xovers. Although I've melted down some passives before and cracked the components even on MB Quart Comp Xovers. I have also seen some pretty high priced tweets glow red hot and saw the domes simply turn black within seconds after installation when I was using active xovers without the pasives hooked up. I will not depend on Active xovers alone any longer. Using a passive that has a point set lower than what you will be working with in combination with the active is most advisable. That way you are guaranteed to never get any noises lower than the passives allow but you can still use the active to move the point up higher to achieve the desired sound. Smaps and pops that are generated along the path to your speakers may not be filtered by the active especially if the active is generating the noise. That's all it will take to pop a tweeter coil, 75w at 80Hz for 1/2 of a second is enough current to fry that tiny wire or create a short across the coil windings. Another thought is that you may want to check your installation, if the screws are not all tightened the same it will cause the diaphragm to twist and may make the coil rub on the magnet from it not running perfectly straight into the gap. Or if its mounted on an uneven surface will cause the same problems. I would check the mounting first by removing it and playing sound while you tweak the speaker slightly with your hands to see if it makes any changes to the sound. Sometimes it takes a while before this problem develops because the plastic face that holds them in place will resist the deformation but over time and some heat they will eventually bend and may stay bent even when remounted. I live in Phoenix AZ so I know all about the problems that heat will cause on a car stereo.</p></blockquote><p></p>
[QUOTE="zinda, post: 8038344, member: 633054"] From what you have said here it's still kinda fuzzy as to what exactly you are asking, but , I can say that if you are using passive xovers on your tweeters it makes no difference where your (active) amp xover is set, since the passive crossovers will block any low sounds from passing through to the tweets. Good quality tweeters are generally pretty durable if used with the supplied xovers. Although I've melted down some passives before and cracked the components even on MB Quart Comp Xovers. I have also seen some pretty high priced tweets glow red hot and saw the domes simply turn black within seconds after installation when I was using active xovers without the pasives hooked up. I will not depend on Active xovers alone any longer. Using a passive that has a point set lower than what you will be working with in combination with the active is most advisable. That way you are guaranteed to never get any noises lower than the passives allow but you can still use the active to move the point up higher to achieve the desired sound. Smaps and pops that are generated along the path to your speakers may not be filtered by the active especially if the active is generating the noise. That's all it will take to pop a tweeter coil, 75w at 80Hz for 1/2 of a second is enough current to fry that tiny wire or create a short across the coil windings. Another thought is that you may want to check your installation, if the screws are not all tightened the same it will cause the diaphragm to twist and may make the coil rub on the magnet from it not running perfectly straight into the gap. Or if its mounted on an uneven surface will cause the same problems. I would check the mounting first by removing it and playing sound while you tweak the speaker slightly with your hands to see if it makes any changes to the sound. Sometimes it takes a while before this problem develops because the plastic face that holds them in place will resist the deformation but over time and some heat they will eventually bend and may stay bent even when remounted. I live in Phoenix AZ so I know all about the problems that heat will cause on a car stereo. [/QUOTE]
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