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Help With Tweeter Crossover
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<blockquote data-quote="BroncosNeverDie" data-source="post: 8744762" data-attributes="member: 675219"><p>Hi everyone,</p><p></p><p>So I'm trying to finally install tweeters in my 1994 Bronco. So far I have the following:</p><p></p><p>1X 12" Rockford Fosgate 750W sub in the back powered by a 1200W Rockford Fosgate amp</p><p>2x 7" Denovo Audio Anarchy 7" Midbass woofers in the doors powered by a Pioneer GM8604 Connected for 2 channel output (so each speaker gets 200W @4ohms)</p><p></p><p>Anyway, herein lies the issue: I have another GM8604. This is a 4 channel, 100W per channel amp. 2 channels are already powering two Alpine 6x9 speakers in the back seat area, and I'd like the other two channels to power my tweeters. The tweeters I have are these: </p><p></p><p><a href="https://ebay.to/3usUrxe" target="_blank">https://ebay.to/3usUrxe</a></p><p></p><p>These are the 100W Alpine HiEnd 28mm tweeters that I heard great reviews about. </p><p></p><p>Now the issue starts at the headunit. I'm willing to spend up to $600 on a double-dine head unit, that has crossover capabilities, but most I've seen have only 6 channel outputs (front, rear, sub). So my idea was to obviously run the front to the 7" Woofers, sub to sub in the back and then split the rear channel with a y-splitter and run both through the second GM8604. One channel would go to the 6x9s and other other would go to the tweeters.</p><p></p><p>Now this may be a stupid question, and forgive me for it, but that would mean I couldn't apply a high-pass filter in the head unit crossover, because both the 6x9s and tweeters would be restricted to the high pass filter, correct? So how do I mitigate this, since tweeters HAVE to have a HPF applied so I don't blow them out. The amps come with a built-in HP and LP filter per channel, but that's only adjustable from 40-500Hz.</p><p></p><p>I was thinking of just putting some micro-farad capacitor in series to work as a HPF to cut off all the frequencies under ~2kHz (I determined this value by doubling the resonant frequency from the Ebay page's bode plot, where it appears to have a resonant frequency of about 800Hz.), but I'm worried that may not be enough or I may not get a quality High-pass filter.</p><p></p><p>Sorry for the long post, but in short my question just boils down to: how can I apply a High-pass filter to JUST my tweeters if their signal comes from a single input that is also going to the 6x9 speakers in the back? I know I could get a DSP but with the 3 amplifiers I'm already running out of space in my car haha!</p><p></p><p>Any help appreciated!</p><p></p><p>-BND</p></blockquote><p></p>
[QUOTE="BroncosNeverDie, post: 8744762, member: 675219"] Hi everyone, So I'm trying to finally install tweeters in my 1994 Bronco. So far I have the following: 1X 12" Rockford Fosgate 750W sub in the back powered by a 1200W Rockford Fosgate amp 2x 7" Denovo Audio Anarchy 7" Midbass woofers in the doors powered by a Pioneer GM8604 Connected for 2 channel output (so each speaker gets 200W @4ohms) Anyway, herein lies the issue: I have another GM8604. This is a 4 channel, 100W per channel amp. 2 channels are already powering two Alpine 6x9 speakers in the back seat area, and I'd like the other two channels to power my tweeters. The tweeters I have are these: [URL]https://ebay.to/3usUrxe[/URL] These are the 100W Alpine HiEnd 28mm tweeters that I heard great reviews about. Now the issue starts at the headunit. I'm willing to spend up to $600 on a double-dine head unit, that has crossover capabilities, but most I've seen have only 6 channel outputs (front, rear, sub). So my idea was to obviously run the front to the 7" Woofers, sub to sub in the back and then split the rear channel with a y-splitter and run both through the second GM8604. One channel would go to the 6x9s and other other would go to the tweeters. Now this may be a stupid question, and forgive me for it, but that would mean I couldn't apply a high-pass filter in the head unit crossover, because both the 6x9s and tweeters would be restricted to the high pass filter, correct? So how do I mitigate this, since tweeters HAVE to have a HPF applied so I don't blow them out. The amps come with a built-in HP and LP filter per channel, but that's only adjustable from 40-500Hz. I was thinking of just putting some micro-farad capacitor in series to work as a HPF to cut off all the frequencies under ~2kHz (I determined this value by doubling the resonant frequency from the Ebay page's bode plot, where it appears to have a resonant frequency of about 800Hz.), but I'm worried that may not be enough or I may not get a quality High-pass filter. Sorry for the long post, but in short my question just boils down to: how can I apply a High-pass filter to JUST my tweeters if their signal comes from a single input that is also going to the 6x9 speakers in the back? I know I could get a DSP but with the 3 amplifiers I'm already running out of space in my car haha! Any help appreciated! -BND [/QUOTE]
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