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  #1  
Old 09-11-2011, 09:36 PM
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Interior lights dim slightly when sub hits

I currently run a 12 JLw3 with a mono JBL amp powering it. I have had it installed now for about two years. I noticed the other night that when I have the volume up around 18-20, the interior lights on the head unit (stock) and the heater controls dim slightly.

It is not very noticeable unless you are really looking close. I even pointed it out to my fiance and she didnt really see it at first.

Anyway, is there anything I can add that would eliminate this? My warranty expired at Car Toys and I have a good amount of in store credit to use.

I was originally planning on running a set of tweets in the doors similar to what RELWARC has in his door panels, but I would like to eliminate the dim as well.

Any suggestions??
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Old 09-11-2011, 09:45 PM
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Put a stiffening capacitor in it. Should eliminate the lights dimming.
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Old 09-11-2011, 09:57 PM
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Re: Interior lights dim slightly when sub hits

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Originally Posted by H2rescue View Post
Put a stiffening capacitor in it. Should eliminate the lights dimming.
Ive heard that those dont really do anything... I have to admit tho, I have no idea what im doing when it comes to this kind of stuff.
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Old 09-11-2011, 10:19 PM
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Re: Interior lights dim slightly when sub hits

You could put a battery isolator with a separate high powered battery for the amplifier. With that your lights shouldn't dim and you shouldn't have to worry about not being able to start your car if you left the stereo on for an extended amount of time with the engine off because the amp for the sub would draw off the separate battery instead of the main. Or possibly consider a class-d amplifier they provide just as much power but are more efficient so they don't require as much amperage. Another option would be a larger alternator.
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Old 09-11-2011, 10:20 PM
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Re: Interior lights dim slightly when sub hits

yea you need a capacitor it will make a difference.
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Old 09-11-2011, 10:50 PM
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Re: Interior lights dim slightly when sub hits

Meh... capacitors dont actually do what a lot of people think they do. In all honesty the people who need them are the ones doing SPL competitions.

I feel it could be two things. Your ground to the amp might not be good enough. If you bolted it the the seat belt mount you should revisit that with a dremel wielding a sandpaper disc or just a tough wire bristle brush to get more bare metal where it contacts. The ground wire also needs to be as short as possible as well.

Also, like 2004wjmedic said, a second battery is normally the cure for that as well. Shuriken and Kenetik come to mind. They are about the most kick ass car audio grade battery you can get.

I had this issue when I had my dual 8" subs. Funny thing is when I switched to a 12" Alpine Type R (using same 2ohm config) it went away. Im figuring that the 12" is more efficient since 8" subs are typically inefficient like a HEMI is on gas.
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Old 09-11-2011, 10:59 PM
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Re: Interior lights dim slightly when sub hits

Capacitors do absolutely NOTHING
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Old 09-11-2011, 11:02 PM
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Re: Interior lights dim slightly when sub hits

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Originally Posted by remmy View Post
Meh... capacitors dont actually do what a lot of people think they do. In all honesty the people who need them are the ones doing SPL competitions.
.
You sir, have hit the nail on the head. I've been in car audio for 7 years and its amazing how many people dont understand.

Putting a cap on your system is like putting a band-aid on a bullet hole. You are just masking the problem. If you're car can't effectivly power what its running now, wheres the cap get its power from when it has to recharge? Sure your lights dont dim, but its still putting a strain on your electrical system.


Back on topic, other things you could look at besides the ground at the amp, would be whats called "the big 3". Google will explain in much more detail what they are. Also, make sure you are using the proper gauge amp kit for the power you are running. Too many times i've seen people run too small of wires causing all sorts of issues. Once had a guy running a JL 1000/1 off a 10ga amp kit....i died a little inside that day.
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Old 09-12-2011, 09:55 AM
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Re: Interior lights dim slightly when sub hits

I'll add. Caps are built to do one thing, discharge electricity RAPIDLY when power is needed. For someone wanting to fix their dimming lights, all a cap will do is become a parasite syphoning off the battery and making the alternator work harder thus NOT fixing the dimming light issue. like I said, only SPL competitors need them to utilize the crack headed power they can discharge for a small amount of time to feed the amps maximum power.
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Old 09-12-2011, 11:23 AM
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Re: Interior lights dim slightly when sub hits

get a bigger alternator.
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Old 09-12-2011, 04:33 PM
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Re: Interior lights dim slightly when sub hits

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Originally Posted by JMLoughrey View Post
You sir, have hit the nail on the head. I've been in car audio for 7 years and its amazing how many people dont understand.

Did we just become best friends?!...YEP!


Lol.
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Old 09-13-2011, 06:39 AM
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Re: Interior lights dim slightly when sub hits

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Originally Posted by gerd35 View Post
get a bigger alternator.
Get heavier gauge wire.The alts in any newer Jeep especially a v8 have more than enough power to run any reasonable system.
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