Interesting voltage problem.

[cotjones 10+ year member]

I'm getting what I believe are voltage drops but the problem is interesting.

#1 it is at certain points only when bass hits and the bass cuts out completely but not immediately. (it fades out)

#2 It seems to only happen at specific frequencies. Some songs with BLAIR the bass around 30-45hz it sounds like by ear. But others poop out miserably. I know its not the enclosure because at 1/2 volume the response is very flat. I have bypassed the amp's crossovers and boosts because i like to control it at the HU.

#3 It seems to happen worst when the song has a continuous bass line then has short bursts of bass added in (such as "go DJ" by lil wayne. On the other hand, the song "Who run it?" by Three 6 Mafia seems to do fine.

The system has a JBL14001 running to a 2.66 ohm load of 3 10w6v2's. (in my sig.) I hooked up a 25 farad cap I had laying around but surprise surprise that didn't work. //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

Stock electrical. 4gauge wire. I went to do the big 3 but this car already has 2runs of 8 gauge each! So obviously that can be improved but I doubt its causing my voltage drop problem now. I'm thinking my battery might be going weak, it hasn't ever been replaced. Either that or some electrical problem that is eluding me.

Any ideas?

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[cotjones 10+ year member]

Bumpity, 'Bump

 

[JoeGibs 10+ year member]

whats the resting voltage on the battery? do you know what size the factory alternator is? try hooking up a dmm to your battery with one of your songs going, and see how low the voltage dips. the gauge on the dash isnt always accurate

 

[cotjones 10+ year member]

eh i need a battery for my DMM lol I took it to the local shop and he said he wasn't seeing much of a dip on the DMM at the battery. I don't see how he didn't though. My headlights dim, that clearly means voltage drop right? I'll be back later with more information.

The stock alt is 100A.

 

[dragon.breath 10+ year member]

lower the gain and try it again. i have the same amplifier and it will do the same thing if the gain is even a little high. i think the input has clipping protection that is a little too protective, if that makes any sense.

 

[cotjones 10+ year member]

lower the gain and try it again. i have the same amplifier and it will do the same thing if the gain is even a little high. i think the input has clipping protection that is a little too protective, if that makes any sense.

That is an interesting theory. I'll check that out. Although, if it is detecting clipping, wouldn't it be better to turn the input voltage down and the gain up? Because if the clipping is at the input its caused by the HU clipping too early in the power range right? or am I missing something?

Thanks btw for your input, i'd have never thought of that. I'll have to check if my amp has that protection circuitry.