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Novice upgrading sound system


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ggeist 
Member - Posts: 2
Member spacespace
Joined: January 17, 2004
Location: United States
Posted: January 17, 2004 at 8:35 PM / IP Logged  

I have a 99 Ford Escort w/ a factory upgrade amp (under the seat) and 5 disc CD changer (in the trunk). I have inherited a Kenwood KAC 744 amplifier and two 12" Kicker subs (in a box) that I believe are 300 amp, I also purchased two 300 watt mini tweeters as well as a couple new 100 watt mid range speakers for the doors (I blew the factory ones). The problem being is I have no idea how to get all these things to work together best. I want the loudest, clear, sound possible w/ this combination. I downloaded the Kenwood KAC 744 manual but am having trouble understanding it (I'm not too good with wiring diagrams and there are several possible ways to use it)

If someone very smart could maybe please explain what I should do in the easiest possible terms I would be very greatful.

Thank you any and all for your consideration.

Geoff Geist
sonicsound 
Copper - Posts: 100
Copper spacespace
Joined: July 08, 2003
Location: Wisconsin, United States
Posted: January 18, 2004 at 2:41 AM / IP Logged  

You have a four channel amp....so... you want to use that for the two pair or four speakers that are in your doors.  Therefore you will not be able to use the subs with it, or at least I would not recomend it.  First you must answer a couple of questions so I can help you and maybe some other people as well can help out.  How many mid range speakers did you buy? Two Pair?  Do the midrange speakers have two pair of positive and negative terminals on each speaker? Does the amp have high level inputs (just check the amp for a plug-in labeled high level)? If it does do you still have the plug for it? 

Now to run those subs I recommend the Kenwood KAC 7201 amp. It's an 800 W Max amp that would work nicely with your 12's.

Write back and I'll help the best i can.

Sonic
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ggeist 
Member - Posts: 2
Member spacespace
Joined: January 17, 2004
Location: United States
Posted: January 18, 2004 at 1:06 PM / IP Logged  

ftp://docs.kenwoodusa.com/manuals/OM-KAC-744-1993-KUSA.pdf

This is the manual for the KAC 744. I've only got one pair of speakers in the doors, they're 100 watt and only have a positive and negative terminal each. There are two 8" factory mid range in the back "lid" and I bought two 300 watt mini tweeters and have two 12" kickers in a sealed wood box that have only one positive and negative input for both. The manual attached has several configurations that would seem like it will handle all these but I don't know how to hook them all up. Still on the right track? Or am I going to have to get another amp? I was thinking maybe driving the car's factory speakers off it's own amp and then using the Kenwood for the heavier stuff?

Yhanks for the response. I appreciate the help.

Geoff Geist
customsuburb 
Gold - Posts: 1,813
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Joined: January 17, 2004
Location: United States
Posted: January 18, 2004 at 2:39 PM / IP Logged  
Considering you have factory speakers in back i would use your kenwood amp for your aftermarket midrange and tweeters up front. I would use the first two channels on your kenwood KAC-744 for your midrange speakers up front in the doors and the other 2 channels for your mini tweeters. i would mount your tweeters in the door panel up front by your midranges and aim them towards the passenger and driver seats if you hav'nt already. Since you have a factory radio i would buy a special speaker level to line level adaptor that you plug into your factor radio harness which you could probobly buy your local car-audio dealer. This adator would send your kenwood amp the preamp input it needs(they would sound better then the high level input adaptor on your amp if you were to use that). From the speaker level to line level adaptor behind your radio run one pair of rca cables to your kenwood KAC-744 amp's first input. The manual should mention a switch on its side that you can use to take the signal from the single pair of rca cables and make it come out of all four channels (since all the speakers you are connecting to your amp are in the front of the car). Ok. Now for the amp for the subs. The amp sonicsoud reccomened sounds fine for your two subs so i would just go ahead and buy that one. You should probobly mount the amp for your sub inside your truck somewhere for easy access. From what is sounds like your kicker subs ar'nt dual voice coil so you will have to wire one sub into the left speaker output of the sub amp and the other sub into the right output. This give you a 4 ohm load which will give each sub 150 continuous watts of power. Now for the preamp inputs for this amp. On the side of your KAC-744 there should be a preamamp output. run an rca cable from this output to the amp in your truck for the subs. There now you should have great sound up front and maybe in the future you can ugrade your back speakers and run them off of the factory amp. Tell me if i didnt leave anything out. Hope this dosnt confuse you more
jeffchilcott 
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Joined: April 11, 2002
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Posted: January 18, 2004 at 4:21 PM / IP Logged  
run your tweets in parralel with your mid range, giving you an 8ohm load on each set.   then run to the amp on 2 channels if the amp is 2 ohm stable run the tweets and mids in series giving you a 2 ohm load, use 2 channels for this and usinging a crossover on the other 2 channels run your sub with that bridged
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customsuburb 
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Posted: January 18, 2004 at 5:02 PM / IP Logged  

Running the subs off of the two extra channels wouldnt give them enough power. I looked at that Kenwood amp and at 2 ohms it only outputs 40 watts continuous by 4. 80 watts for two subs would starve them pretty bad I think.

jpranwez 
Member - Posts: 33
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Joined: January 12, 2004
Location: United Kingdom
Posted: January 18, 2004 at 5:04 PM / IP Logged  

I think I have another option as well. First you need to know how many ohms your subs are. If there in the box you should ask who you got them from whether or not they're dvcs. If they are dvc that's better. You can run them in parallel in the box and then in series to the amp and you'll have 4 ohms at the amp. I'll get back to that. If you wanted to,instead of buying speaker level to line level adapter and a sub amp you could buy another deck. This does two things. I don't know how many you'd have in the rcas after the adapter but it makes a difference to amp output. Second, if you buy a half way decent deck it will make interior speakers play almost as well as if you had a low wattage amp going to them. You could run your tweeters off the deck and your subs and mids off the amp. To do this is pretty simple. Your amp has two sets of rca inputs. Channel1+2 and 3+4, the left side is on the top of both sets. If buy a deck with at least 2 rca outputs which is pretty standerd and run a set  to all the amp inputs. On your amp you have two switches for operation. The first onefor channels 1+2 set to stereo. These are for your mids in the front. You run your speaker wire in two pairs off channels 1+2. And leave hpf/lpf off. The second switch for operation set to mono all the way to the right. This for your subs, You run the left most terminal as your positve wire and the 3rd left as your negative.Back to the subs, if they're dvc run them parallel series, if they're svc 4ohms you could try running them in parallel to the amp, but that gives you 2 ohms and your amp might not like that. It says it can handle two in stereo but mono might be pushing it. If you want to play it safe put your operation switch back to stereo and run two pair of speaker wires to the subs seperately. Either way don't forget to put the low pass filter on.

One thing I don't is if you could use your factorycd changer with any other cd decks??????

Jeff, I thought if you run two for ohms speakers in parallel impedance goes down to 2ohms and up to 8 if you run it in series.   I think if you run the mids and tweeters in parallel and then the two sets in series to the amp, you could bridge the channels and you'd be running the amp at 4 ohms. Then use the other two channels for your subs.

If I were you man I'd get a deck and a rockford amp if your on a budget and use the kenwwod amp for my interiors.Alpine 9805s Ithink are pretty good for 140-150$, plus fifty to install if you don't want to, and a 451s would make your subs sound good for a 135$. Both those prices are brand new off ebay. Good luck

customsuburb 
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Joined: January 17, 2004
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Posted: January 18, 2004 at 5:34 PM / IP Logged  
If you buy a new head-unit go for an Alpine CDM-9823. It has two sets of preamp outputs and is a real qood quality head-unit. If you do buy new cd player run your 6 x 8's off of the Alpine's amp then use the kenwood to power your front midranges and tweeters ,and buy a Rockford Fosgate or Kenwood amp for your Kicker subs. If you buy a Rockford amp consider their Power 451S amp or the Punch 301S.

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