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  #1  
Old 07-10-2012, 10:05 PM
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I'm running my 2 way front stage ACTIVE of a Alpine 9887

So far i'm starting with these settings:

High (tweeters)..... 2.5khz @ 18db
Mid Low..... 63hz @ 12db
Mid High..... 2.5khz @ 12db
Sub...... 80hz @ 18db slope


Would you make any changes to the above^^^
Only change I could think of is to change the mid crossover from 12db slope to 18db

Last edited by PurpleDiesel; 07-11-2012 at 01:48 PM.
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Old 07-10-2012, 10:17 PM
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you say your running it "Active" yet you are looking at passive filters. im not sure you understand running active...
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Old 07-10-2012, 10:20 PM
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you say your running it "Active" yet you are looking at passive filters. im not sure you understand running active...
Everything in my front stage is being run active off a alpine 9887 and alpine F6 yes... I'm simply wanting to protect my tweeters with a HighPass Filter.

My amplifier crosses up to 425hz run my tweeters that low on 150w and POOF.
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Old 07-10-2012, 10:21 PM
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Why not just use a 1st order at the right frequency? Capacitor.

Car Audio - Speaker Crossover Chart and Capacitance vs. Frequency Calculator(High-pass)
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Old 07-10-2012, 10:24 PM
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Why not just use a 1st order at the right frequency? Capacitor.

Car Audio - Speaker Crossover Chart and Capacitance vs. Frequency Calculator(High-pass)
I've tried this and found that it takes away from the SQ. I'd prefer a nice 12db slope to smooth things out
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Old 07-10-2012, 10:27 PM
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Then you had it too close to your crossover point. A cap does not magically change the sound going through it, and in fact the 2nd order your looking at has even more parts in the circuit.
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Old 07-10-2012, 10:29 PM
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if you are running active off your 9886, simply set the crossover section on your amplifier to full or through or off w/e it may have for only the tweeter channels, next set your desired frequency cutoff and slope on the 9887... that simple. do all of your filtering from your headunit, and none from your amp.
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Old 07-10-2012, 10:30 PM
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Then you had it too close to your crossover point. A cap does not magically change the sound going through it, and in fact the 2nd order your looking at has even more parts in the circuit.
Too close? FS on the tweeter is 800hz
I had a 22uf cap on it (1800hz)

Do you think i'd be happier to a 5khz @12db slope passive crossover or another cap around 3900hz.
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Old 07-10-2012, 10:35 PM
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Quote:
Originally Posted by DonH View Post
if you are running active off your 9886, simply set the crossover section on your amplifier to full or through or off w/e it may have for only the tweeter channels, next set your desired frequency cutoff and slope on the 9887... that simple. do all of your filtering from your headunit, and none from your amp.
The crossovers selections on my 9887 are
60hz/80hz/100hz @ 0/6/12/18/24 db slope

That doesn't really help me. I have my mids on full pass at the amp and tweeters on highpass (400hz)

In my EQ setting I can set 2.5/3/4/5khz @ Q of 1/1.5/3
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Old 07-10-2012, 10:39 PM
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What is your HP/slope for the tweeters? If it's 18 or 24db then I would shoot for at least an octave below your crossover point, because by then it will be so far below the audible level it shouldn't be a problem.

Last edited by schmiddr2; 07-10-2012 at 10:51 PM.
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