Setup/Crossover
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=18307
Printed Date: July 30, 2025 at 2:50 AM
Topic: Setup/Crossover
Posted By: mj239air
Subject: Setup/Crossover
Date Posted: August 31, 2003 at 7:50 AM
Ok, here is my setup:
Alpine 7949 for my head unit
PPI Powerclass 450 running 2 sets of MB Quart components for the front. (218.03 and 215.03)
PPI Powerclass 450 running 1 set of MB Quart components for the rear. (218.03)
PPI Powerclass 2350 running 2 JL 18w6's.
PPI Powerclass 4100 running 3 JL 12w6's.
Possibly 4 Audio Control EQT's, 1 pair for the front and 1 pair for the rear.
I also have an Audio Control 4xs and want to know if I really need it. I know that my Quart components come with there own passive crossovers but I want to know if I would gain anything by also using an electronic crossover.
By the way this is all going in my 2000 Suburban. And yes I already have my High Output alternator.
Any help or opinions would be appreciated!
Replies:
Posted By: italnpimp59
Date Posted: August 31, 2003 at 8:05 PM
sounds like you have an awesome setup. lotta bang, and crisp mids and highs. well as far as using another electronic crossover....it is not necessary. the crossover that comes with your component set is especially made for that tweeter and woofer. it filters the frequencies right where it is needed.
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Posted By: mj239air
Date Posted: September 04, 2003 at 10:23 AM
Ok I understand what you are saying, and I know that already. My concern is that my head unit has 3 outputs. Front, Rear and Sub. I plan on using the 4 EQT's, 2 for the front, 2 for the rear. If I use the 4xs I would also be able to have the outputs necessary for my 2 4 channel amps. Seeing how I will have a total of 4 channels for the front, and 4 channels for the rear it is only logical to go this route. I can wire without having to use any RCA Y-adapters. If anyone else has any ideas about this and why I shouldn't do it this way, please speak up. I would appreciate the help since I am in the final stage of my install.
Posted By: wvsquirrel
Date Posted: September 04, 2003 at 11:30 AM
If your PPI Powerclass 2350 or PPI Powerclass 4100 has RCA outputs, then you could daisy chain the amps with a short patch cable. Run from the headunit into 1 amp, then from that amp into to other. Most amps with RCA outputs will send a clean low level signal through it to the next amp. ------------- Squirrel
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Posted By: mj239air
Date Posted: September 04, 2003 at 12:15 PM
It does have the RCA outputs, but which would be better, the outputs or a Y-harness for the sub amps? Is it a bad idea though to use the electronic crossover as well as the passive crossovers?
Posted By: DYohn
Date Posted: September 04, 2003 at 3:57 PM
mj239air wrote:
It does have the RCA outputs, but which would be better, the outputs or a Y-harness for the sub amps? Is it a bad idea though to use the electronic crossover as well as the passive crossovers?
In my opinion, it is better to use the RCA outs from the amps than to run Y-cables. But either will work. Now as far as using both active and passive xovers, there is nothing wrong with this as long as it is setup correctly. For example, I have my front component set electronically crossed over at 80 Hz before the amp, then I use the passive Xover that came with the components to split mid/high. You can get into trouble if you "daisy-chain" crossovers that are set close to one another, where one can essentially add to the effect of the other and your actual xover point can shift. As you describe your intended setup, I believe it should work just fine. Especially since you seem to know what you're doing! :-)
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