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Message Forums Car Stereo Message Forums > > amp crossoversettings
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hedrocks420
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 amp crossoversettings

I just put in my door panels up front that were made for Kicker SSMB 8" and Phoenix Gold RDS6.5cs.  I also put in a JL 4 @ 6 channel to power my mids and highs.  The 6 channel is powering the phoenix golds with 4 channels bridge to two channels @ 4 ohms for the phoenix gold and the crossover is set on highpass @ 100 hz. which everthing seems to be working just fine on that. The other 2 channels are for the rear also no problem.  The 4 channel powering the Kicker 8's which is also bridge.  The crossover is set on low pass @ 100hz.  The headunit is crossedover @ 40hz, for the fronts and 60 for the rears.  My 4 channel still plays down past 40 hertz when taking readings with a DMM on the outputs. And thats the problem.  Theoretical that shouldn't be happeing.  The front rca is running first to the 4 channel and then to the 6 channel both split to a left and right channel with Y splitter.   If anyone has input on why my 4 channel would play below the crossover frequencies, I'd appreciate it. 

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New Post 04-02-2008 11:20 AM
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N2Audio
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you're going to have to do some serious editing for that to make any sense at all, but one thing I can tell you -- Crossovers aren't walls -- they don't just remove everything beyond the crossover point.  They "roll-off".

If you use a high pass crossover at 100hz everything below 100hz will reduced gradually according to the slope of the crossover.  12db/octave is a common slope.  That means if you have xdB at 100hz, you'll have x-12 dB at 50 hz, it's a big decrease, but it's not altogether gone.

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New Post 04-03-2008 09:45 AM
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hedrocks420
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I spent some time messing around with it yesterday.  I changed the crossover setting on my head unit from a slope of 12db to 18db then to 24db.  When it is at 18db I still get some of the unwanted 30-25hz but with enough of a difference in the amount of output from the Kickers.  With it set at 24db it has very little output at 20hz which is not enough to do damage.  So I think If I either set the crossover slope at 18 or 24 that should take care of the problem, but I'll have to see how it sounds with the frequecy set a bit high with the slope at 12db.  Whatever sound the best, I just don't want the speakers to become damaged playing that low of a frequency.  If the first post doesn't make sense you probably aren't interpeting it correctly.  There is a 4 channel and a 6 channel power my mids 8 channels altoghether for my fronts and 2 channels for the rears.

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New Post 04-03-2008 11:01 AM
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