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General Car Audio
ya know... i dont know if i like a front stage..
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<blockquote data-quote="MiniVanMan" data-source="post: 5963847" data-attributes="member: 573252"><p>Okay, when you guys are talking phase, you need to understand phase shifts behave much differently with higher frequencies than lower. If you guys want to do some math, here's a great article. <a href="http://www.moultonlabs.com/more/about_comb_filtering_phase_shift_and_polarity_reversal/" target="_blank">http://www.moultonlabs.com/more/about_comb_filtering_phase_shift_and_polarity_reversal/</a></p><p></p><p>I don't want to do the math right now. But it's a great example of how delaying a speaker by even a hair can create a huge phase shift at high frequencies. With huge phase shift, polarity reversals are useless as well.</p><p></p><p>Time alignment is just about useless at higher frequencies. When we experience a problem like this, the best thing to do is turn down the offending driver. In the case of tweeters, it's about all you can do unless you can equalize the path lengths, which is very difficult to do in a car.</p><p></p><p>Running a tweeter off-axis only helps because it decreases the output of you higher frequencies. Less output at high frequencies equals less directionality that pulls your ears to that particular driver.</p><p></p><p>So frankly it doesn't matter where you put your tweeters. What the OP is saying is that in his current location, the off-axis response has degraded the top end output of the tweeter to a point that it exhibits much less directionality.</p><p></p><p>What does that mean. The OP prefers less top end to more directionality. That's fine, it's his preference. Not much he can do about it otherwise as those are really his only options with his current setup. I didn't read if he's running passive. If he is, then he's even more screwed.</p><p></p><p>Mono ambiophonic line arrays across your dash FTW.</p></blockquote><p></p>
[QUOTE="MiniVanMan, post: 5963847, member: 573252"] Okay, when you guys are talking phase, you need to understand phase shifts behave much differently with higher frequencies than lower. If you guys want to do some math, here's a great article. [URL="http://www.moultonlabs.com/more/about_comb_filtering_phase_shift_and_polarity_reversal/"]http://www.moultonlabs.com/more/about_comb_filtering_phase_shift_and_polarity_reversal/[/URL] I don't want to do the math right now. But it's a great example of how delaying a speaker by even a hair can create a huge phase shift at high frequencies. With huge phase shift, polarity reversals are useless as well. Time alignment is just about useless at higher frequencies. When we experience a problem like this, the best thing to do is turn down the offending driver. In the case of tweeters, it's about all you can do unless you can equalize the path lengths, which is very difficult to do in a car. Running a tweeter off-axis only helps because it decreases the output of you higher frequencies. Less output at high frequencies equals less directionality that pulls your ears to that particular driver. So frankly it doesn't matter where you put your tweeters. What the OP is saying is that in his current location, the off-axis response has degraded the top end output of the tweeter to a point that it exhibits much less directionality. What does that mean. The OP prefers less top end to more directionality. That's fine, it's his preference. Not much he can do about it otherwise as those are really his only options with his current setup. I didn't read if he's running passive. If he is, then he's even more screwed. Mono ambiophonic line arrays across your dash FTW. [/QUOTE]
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ya know... i dont know if i like a front stage..
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