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Old 11th May 2010, 01:31 PM   #1
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Default Electronic Crossover

I cant find an answer to this question. I bought This crossover. Deff Audio Power Acoustik C3184 3 Way Electronic Crossover

I was wondering when I install it what do I set the amps internal crossover to? I have an older KAC-927 and it has a crossover in it but its not quite giving me what I expect from my door speakers. Would it be common practice to set the amps crossover to full when using an electronic crossover, or do I set the onboard to something different? also what would I set the xover point on the class D mono block? I am guessing because monoblock doesnt have a full would I just match them? or set to highest on amp and fine tune with electronic Xover?

Also I have an eq. Would I run 2 sets of rca's to this crossover, Or just the set comming off the eq? My eq is an older kenwood and only has 1 set of rcas (In and out). Should I just op out the eq, place it just for the highs, or tie everything to it?

PS: I plan on hooking all 4 (front and rear) speakers to this amp. Tied 2 per channel @ 2ohms, and possibly using a smaller amp for tweeters (maybe smallest amp I can find)

Last edited by Simbalage21; 11th May 2010 at 01:45 PM.
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Old 11th May 2010, 02:22 PM   #2
Glowbug is offline Glowbug  United States
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Bypass them, and if you can't bypass, make sure the crossover is well within its bandwidth.

The crossover should be the last thing before the amps, so it'd go head unit -> EQ -> Xover. One set of RCAs to the Xover.

It only makes sense to use something like this if you're running multiple amps for the front speakers, or at least have amplification for each set of drivers (midbasses & tweets, for example). If it were me, I'd ditch the rear speakers & get a smaller amp for the tweets like you mention.

Tuning an active setup isn't easy at first, but the results are well worth it IMO
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Old 11th May 2010, 03:33 PM   #3
jol50 is offline jol50  United States
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That xover looks to be setup for sub/front/rear, it can do a sub/mid/high but has no LP to bandpass the mid but you could get around that. If you want to run front and rear passive comps or coax, its fine and run the EQ before all of it I would recommend, though you can put it in only on the fronts if you want to use the head unit fader. Since the EQ can't fade you would be left with setting the front and rear amp gains to do that or buy an RCA fader of some kind, if you run EQ before the crossover.

Far as amp crossovers, they are the same thing as what you have, you can turn them off as most do to possibly get a cleaner signal through the amp with no filters. For a sub amp just set it high as it goes, or high as you would ever run subs. If you run at 80Hz say just set it to 150 or better and you will not notice it. If you also set the amp to 80Hz, you add the two slopes together at 80, it will cut it off faster. Note you need to use tones or something to determine where 80 actually is because the printing on amps and crossovers is rarely exact.

If you wanted to run active and rears and your HU has front & rear, you could run the front mid/high and sub with the crossover, then the rear off the HU to run rears and use an amp crossover to HP them at 80 or whatever. If you wanted suggestions I'd just say get a new HU with a crossover in it, but note that most can only do front/rear or mid high along with sub and not both. Anyway, you can run no processors at all since most active HU also have an EQ in them.
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Old 11th May 2010, 06:08 PM   #4
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Default Rear

Thanks for the quick responses. why do alot of people think rears are bad? My radio does have 2 pairs of rca's out (front/Rear), and my laptop is fed to a barrel adapter that allows me to use the changer input as aux. So if reading this right the best solution is to run the front, tweets, and sub together on the crossover and the rears on separate amp separate from everything? I have diamond crossovers currently and the amp is connected to those and there is a raf which said stands for rear accustic fill. (see attachment) Went electronic because all over the net they say electronic is cleaner then passive. the eq is old and a bit janky, however the radio only has settings for bass, mid, and treble. Nothing for each band respectivly. My first install I was using the eq to cut frequencys to the vocal amp, and had the monoblock tied tirectly to the headunit... but everyone told me this was wrong everything should go through the eq. I guess back to my original question what would be the best possible setting to have vocals scream with bass. Currently my bass is rattling the car, I like the bass loud thus why I didnt turn amp down any lower, just want clear, screaming vocals..

Also what if I just tied all 4 to this amp 2 speakers a channel. The amp will produce more power at 2ohm.

and finally what would be some good crossover settings for each? were talking not the best (meijer dual) coax, which I will be upgrading..
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Last edited by Simbalage21; 11th May 2010 at 06:19 PM.
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Old 11th May 2010, 06:13 PM   #5
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Quote:
Originally Posted by jol50 View Post
it can do a sub/mid/high but has no LP to bandpass the mid but you could get around that..
So how would I get around this? what makes that feature unique? I have a small 50w that I could use for tweets, and respectivly use the kac-927 for mids, but how would I get around this lp to bandpass. By that do you mean using another amp connected to the rears on radio byitself?
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Old 11th May 2010, 08:46 PM   #6
Glowbug is offline Glowbug  United States
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Quote:
Went electronic because all over the net they say electronic is cleaner then passive.
It's not magic - electronic crossovers are meant for a specific purpose, running separate components with the ability to change crossover points and slopes.

For your application, I think you'd be better off getting a good passive set with metal dome tweeters.
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Old 11th May 2010, 09:27 PM   #7
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Default too late

Well its a little too late, because I ordered the electric crossover, and have them diamond passive crossovers listed on creigslist. I dont like passive crossovers because they blow up under hipower. For some reason everytime I use them and get into a mood to distort blast my music they fry. I know its not good thing to do, but everyone at some point have pushed their system way beyond its limits. Its like saying no one ever speeds LMAO!. But these were some questions before I do the install. I want to fully understand how electronic crossover work so I dont run into problems... I didnt see anywhere on the net talking about when using an electronic crossover what to set the amps internals at. Basically I am after info on getthing the crossover I purchased above to work with the components I already have to top performance, and be able to expand later.. No harm intended
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Old 12th May 2010, 12:17 AM   #8
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Default This for tweets?

Would this work well on the crossover for tweets? or is this too small? I am guessing tweets dont need alot of power, but then again I could be wrong..
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Old 12th May 2010, 12:36 AM   #9
jol50 is offline jol50  United States
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Active does the same thing as passive, just at the low power point before the amp. This way the amp does not waste effort making sound that you don't want, but mostly you can change them in the fly. Band pass is cutting the bass and treble from a mid. You could run an amp that had a high low pass that would do this, or use an inductor/etc passive to do that. Some mids might not need it.

Anything you do active you need another amp, so you would need mid and high amp front, full range rear, sub amp....or of course a four channel for two sets.

You will just damage stuff and sound nasty clipping the amps, just get larger ones....though you may get mad at yourself in 20yr when you start hearing funny sounds all the time.

Its not that hard to set up, and you can buy used ones cheap if you need more. Tinkering with the settings and getting them just right is tuning and can be the hard part.
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Old 12th May 2010, 01:09 AM   #10
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cool, yea I read exactly that, that because your crossing over before its amplified you have cleaner signals. My only other question now is my amps crossover dont have bandpass either, But either full, low, and high.. So how would I accomplish getting the speakers to produce vocals and mids only between the new crossover that is comming and the ones in the amp? also when using a crossover before the amp, what would gains on amp be set at? Could I max them, and use the crossover to adjust all my amps vs pulling everything apart when I need to up or down the gain? Thank you ALL for taking the time to help me fully understand my options
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