Some Glitches

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pence117
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Some Glitches

Postby pence117 » Tue May 13, 2008 1:43 pm

Hi, I am Justin, 21, from Kalamazoo, MI and seem to keep coming up with more and more questions about car audio. I figured I would stop bothering local car audio dealers and bother you all instead:)

I recently upgraded my system because I managed to blow my old sub, which was a Kicker 04S15l72, and replaced it with a 08S15l72. I just couldn't get away from that square cone!! I have had the new sub for about 2 weeks now and was able to really test it out, now that it had been broken in a bit. Before I tell you what happend I geuss I can tell you my setup.

Car: 2000 Toyota 4Runner
Deck: Pioneer Premier DEH P770MP
Front speakers:Stock:meh:
Rear speakers: Alpine SPS 500 5' 1/4
Amp: KAC 9152 D
Box: ported w/ greater than 3ft^3
I am running the Sub at about 2 ohms and my amp SAYS it is stable up to 1000rms @ 2 ohms.....

Its not... lol I put on a sub test and my car was flexing all over and then my amp shut off.

So now I am looking for a new amp that will be able to power my new baby!!(I was hoping to spend under 3 to 400 dollars on the amp)

I noticed my lights are dimming greatly at night, I even had someon give me the finger as I passed them on the highway, because they thought I was flashing them. I have no idea what type of capacitor for this setup.(I was also hoping to spend under 150 for the cap)

Any suggestions would be welcome, also any suggestions for some new front speakers would be helpful for the future. Thanks!! (this is a repost from the initiation page but was looking for help from anyone, sorry!!)
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X-OvrDistortion
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Postby X-OvrDistortion » Tue May 13, 2008 2:58 pm

#1 - Cap will not help you lack of a good alt to keep up with your amp.

#2 - Are you clipping your amp?

#3 - #2 is bad mmmmKay.
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KU40
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Postby KU40 » Tue May 13, 2008 3:03 pm

your amp may have shut off due to low voltage. low voltage is also why your lights dim. So you need to address your charging system before anything else in my opinion. What size is your alternator? Your battery is 8 years old, it may be getting onto the downside of its life. Might think about replacing it with an optima red top or something like that. I had a little light dimming in my old car and when I upgraded to a red top it noticeably improved. The next step would be to upgrade the alternator and battery wires under the hood to at least 4 guage. I hope the power wire for your amp is at least 4 guage as well.

and as x-ovr said, a cap would be useless to you.
-Nick aka NS1 aka mopey aka speedbump
Alpine CDA-9827
Crossfire CFQ5.2
JL Audio XR 650csi components, Planet Audio TT2300
Crossfire VR404 on factory rear 6x8's until I get them upgraded
SI 15D2 + 3.8 @ 30 hz + Crossfire BMF 1000D = :)
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pence117
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Postby pence117 » Tue May 13, 2008 3:40 pm

KU40 wrote:your amp may have shut off due to low voltage. low voltage is also why your lights dim. So you need to address your charging system before anything else in my opinion. What size is your alternator? Your battery is 8 years old, it may be getting onto the downside of its life. Might think about replacing it with an optima red top or something like that. I had a little light dimming in my old car and when I upgraded to a red top it noticeably improved. The next step would be to upgrade the alternator and battery wires under the hood to at least 4 guage. I hope the power wire for your amp is at least 4 guage as well.

and as x-ovr said, a cap would be useless to you.


Well this is def. why I joined, thanks for the input on the cap! My battery is actually a year old, I replaced it when I bought the car. As for the wiring to the amp, it is a 4 gauge. I am going to tell you right now im not too mechanically intelligent, but I believe the stock alternator is a 12v at 60 or 70 amps... if that sounds right. The battery may be cabout it, lose to dead now that I think, every once in a while ill bumb my car starter and will drain the battery a bit. My head unit has a voltage meter and for the most part it stays at about 13.8v again I am not sure if that is good or not...
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pence117
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Postby pence117 » Tue May 13, 2008 3:45 pm

X-OvrDistortion wrote:#1 - Cap will not help you lack of a good alt to keep up with your amp.

#2 - Are you clipping your amp?

#3 - #2 is bad mmmmKay.


#2??? not sure exactly what that is but it says that it is stable at 2 ohms 1000rms power and my sub is 1000rms peak...
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KU40
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Postby KU40 » Tue May 13, 2008 4:20 pm

13.8 isn't too bad. But having only a 60 or 70 amp alternator is, yikes. I'm sure that thing is sweating under there trying to keep up with that amp.

I just read a review where another guy had a problem with this amp cutting out above 60%, but the other 5-6 reviewers didn't report this problem. hmm. I don't know if there's something that you two share in terms of vehicle setup. Or maybe a few of the amps just aren't too good from the factory.

try wiring your sub in series and see if it still shuts off, and wiring just one voice coil up at a time. it's possible that your sub has a problem where maybe one of the voice coils is shorting out a little or something
-Nick aka NS1 aka mopey aka speedbump

Alpine CDA-9827

Crossfire CFQ5.2

JL Audio XR 650csi components, Planet Audio TT2300

Crossfire VR404 on factory rear 6x8's until I get them upgraded

SI 15D2 + 3.8 @ 30 hz + Crossfire BMF 1000D = :)
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KU40
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Postby KU40 » Tue May 13, 2008 5:22 pm

or I guess taking a DMM to the coils to measure their resistance would do the trick instead of that last part I mentioned.
-Nick aka NS1 aka mopey aka speedbump

Alpine CDA-9827

Crossfire CFQ5.2

JL Audio XR 650csi components, Planet Audio TT2300

Crossfire VR404 on factory rear 6x8's until I get them upgraded

SI 15D2 + 3.8 @ 30 hz + Crossfire BMF 1000D = :)
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pence117
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Postby pence117 » Wed May 14, 2008 1:36 pm

KU40 wrote:or I guess taking a DMM to the coils to measure their resistance would do the trick instead of that last part I mentioned.

When I put the dmm on the coils of the sub...?? sorry real big noob here...

I turned my volt meter on my deck again and noticed that when I was at a stop with the music at about 80% my voltage went from almost a steady 13.8 into a 12.1-.5, then the sub would cut out, so i am thinking a new alternator that can handle the juice?
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KU40
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Postby KU40 » Wed May 14, 2008 4:33 pm

12 isn't too terribly low that your amp should shut off. Unless you're getting a large voltage drop from the battery to the amp. what size is your power wire?
-Nick aka NS1 aka mopey aka speedbump

Alpine CDA-9827

Crossfire CFQ5.2

JL Audio XR 650csi components, Planet Audio TT2300

Crossfire VR404 on factory rear 6x8's until I get them upgraded

SI 15D2 + 3.8 @ 30 hz + Crossfire BMF 1000D = :)
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KU40
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Postby KU40 » Wed May 14, 2008 6:10 pm

I just figured out what your problem is and it's all because I didn't read your first post clearly enough. In the Kicker's product number, 15L72, the 15 is obviously the size, L7 the model, and 2 stands for dual 2 ohm. they also come in dual 4 ohm, 15L74. Let me guess, you wired your voice coils in parallel (both positives together to the positive on the amp, both negative together to the negative on the amp)?

if so, you have created a 1 ohm load. not a 2 ohm load. You're under the impedence that the amp can handle.
-Nick aka NS1 aka mopey aka speedbump

Alpine CDA-9827

Crossfire CFQ5.2

JL Audio XR 650csi components, Planet Audio TT2300

Crossfire VR404 on factory rear 6x8's until I get them upgraded

SI 15D2 + 3.8 @ 30 hz + Crossfire BMF 1000D = :)

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