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=31700
Printed Date: May 14, 2024 at 6:28 AM
Topic: crossover
Posted By: robblackman
Subject: crossover
Date Posted: May 06, 2004 at 11:05 AM
ive been informed that to run two subwoofers of my amp caliber ca4520 i need a passive crossover that will drive two subs .but i cant find a crossover that states that it will do this.can anyone recomend a crossover. thanks in advance rob
Replies:
Posted By: DYohn
Date Posted: May 06, 2004 at 12:22 PM
I don't understand why you think you need a passive crossover. Is something else besides the subs running off the amp? ------------- Support the12volt.com
Posted By: kgerry
Date Posted: May 06, 2004 at 12:30 PM
going passive expect to see a lot of line loss thru those passive coils, go active Rob, not passive
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Kevin Gerry
Certified Electronics Technician
MECP First Class Installer
Owner/Installer
Classic Car Audio
since 1979
Posted By: robblackman
Date Posted: May 06, 2004 at 1:39 PM
how do i wire up the amp if one output is rear and one is front in other words lowpss/highpass
Posted By: kgerry
Date Posted: May 06, 2004 at 2:20 PM
should be selectable hi/low for both banks shouldnt it?? just set both for low pass
-------------
Kevin Gerry
Certified Electronics Technician
MECP First Class Installer
Owner/Installer
Classic Car Audio
since 1979
Posted By: robblackman
Date Posted: May 06, 2004 at 2:27 PM
unfortunatly ive a choice of full/lowpass on one channel and full/highpass on the other channel ?
Posted By: kgerry
Date Posted: May 06, 2004 at 2:41 PM
then.... as you say over there.... you're buggered
-------------
Kevin Gerry
Certified Electronics Technician
MECP First Class Installer
Owner/Installer
Classic Car Audio
since 1979
Posted By: robblackman
Date Posted: May 06, 2004 at 6:40 PM
can i put a single crossover on the full / highpass output
Posted By: forbidden
Date Posted: May 06, 2004 at 8:06 PM
Rob, have you got a link to the site for this amp, preferably the manufacturer site.
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Top Secret, I can tell you but then my wife will kill me.
Posted By: robblackman
Date Posted: May 06, 2004 at 9:04 PM
www.caliberaudio.com model no Caliber CA4520 Car Amplifier cheers for the help thanks in advance rob
Posted By: forbidden
Date Posted: May 07, 2004 at 1:26 PM
Rob , this amp has built in active crossovers. You do not need passive crossovers in any case. Now here is where the problem lies. This amp is a 4 channel that has hp on the front and lp on the rear. If you want to hook your 2 4 ohm subs up to this amp and run the amp in the bridged mode, meaning 4 channels bridged into 2, this is where your problem is. I would not use the crossovers in the amp at all. Does the cd player you have use a sub preout and if so does that preout have a crossover included in it. A quick check of the cd players instuctions will tell all. If the cd player does not have this sub preout or crossover then it in your best interest to purchase an active crossover of some type. You will want one that is called a 2 way crossover, some may include a line driver as well. One that I will recommend is the Audio Control 2XS or the Caliber CX2R found on the same site under the equalizer section. This will make that amp behave like it should. An active crossover comes before amplification and splits the signal properly. This makes much greater use of your available amplifier power. Need more info, drop us a post, hope this helps.
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Top Secret, I can tell you but then my wife will kill me.
Posted By: robblackman
Date Posted: May 08, 2004 at 11:15 AM
do you know where i can find a easy to follow circuit drawing of the above as this the first time ive tried this once again thanks in advance rob
Posted By: forbidden
Date Posted: May 08, 2004 at 1:13 PM
A diagram may be included with the crossover, buy that Caliber CX2R that I found on the site you listed and we can go from there. You will also need two short rca cable and 2 rca y splitters (maybe but have them just in case). They should be female to 2 male. ------------- Top Secret, I can tell you but then my wife will kill me.
Posted By: robblackman
Date Posted: May 14, 2004 at 1:34 PM
hi i now have all the parts mentions above but the instrustions leave a lot to be desired as mentioned . could you please help me find a simple drawing or web site help thanks in advance ] rob
Posted By: forbidden
Date Posted: May 14, 2004 at 4:48 PM
Rob, please post me your e-mail address.
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Top Secret, I can tell you but then my wife will kill me.
Posted By: forbidden
Date Posted: May 15, 2004 at 5:03 PM
Rob got your e-mail but my store is overflowing right now. I have to look after my paying customers first. I hope that one of the other fine members of the site can pick up where I left off. If I have a chance to post on this I will. ------------- Top Secret, I can tell you but then my wife will kill me.
Posted By: robblackman
Date Posted: May 16, 2004 at 6:22 AM
hi anyone help thanks in advance
Posted By: stevdart
Date Posted: May 16, 2004 at 10:48 AM
Xover goes between head unit and amp, set it a low pass, set the amp both on full range. Adjust freq range on Xover and make both sides equal for your subs.
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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: customsuburb
Date Posted: May 16, 2004 at 12:28 PM
Send the sub output (or which ever one you are sending to your subs) from your cd player to the input on the crossover. Then split the sub output (or lowpass output) on the crossover with rca splitters and send the signal to the front and rear inputs on your amp. Then set the amp's built in front and rear crossovers to full range (or off). Then adjust the crossover frequency on the external crossover (I would play around with the crossover setting until you feel the sub is matched to your main speakers). Here is a diagram: 
Posted By: robblackman
Date Posted: May 17, 2004 at 8:22 AM
hi thanks for the above infomation ,one question why do you use the high pass output and not the lowpass ? thanks in advance rob
Posted By: stevdart
Date Posted: May 17, 2004 at 9:02 AM
customsuburb wrote:
Then split the sub output (or lowpass output) on the crossover with rca splitters and send the signal to the front and rear inputs on your amp.
Sometimes a picture is not worth a thousand words...go with his descriptive narrative, not the particular diagram labelling. ------------- Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: forbidden
Date Posted: May 17, 2004 at 2:00 PM
Thanks for picking up where I left off guys. Rob, Customsuberb gave you the correct diagram with the obvious oversight that he should have chose the lowpass outputs on the crossover. How are things going with the install. I have a failry busy week booked in again but will read up when I can.
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Top Secret, I can tell you but then my wife will kill me.
Posted By: robblackman
Date Posted: May 17, 2004 at 2:22 PM
thanks for all the help everyone im going to hopefully make a start on the weekend
Posted By: customsuburb
Date Posted: May 17, 2004 at 4:40 PM
stevdart wrote:
customsuburb wrote:
Then split the sub output (or lowpass output) on the crossover with rca splitters and send the signal to the front and rear inputs on your amp.
Sometimes a picture is not worth a thousand words...go with his descriptive narrative, not the particular diagram labelling.
Sorry about the diagram guys. 
Posted By: robblackman
Date Posted: May 24, 2004 at 2:03 AM
hi i just about got my head around all this except that i know have to bridge the outputs to the subs could anyone please explain how to wire this bit a drawing would be good. thanks again in advance rob
Posted By: forbidden
Date Posted: May 25, 2004 at 3:04 PM
The amp may show a bridged wiring configuration on the amp itself. Usually you will use channel 1's pos and channel 2's neg for example. Look closely at the amp to see if it shows something like this. ------------bridge----------- / \ + left - + right - ------------- Top Secret, I can tell you but then my wife will kill me.
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