GeeJenn91RSV8

Hi all. Here's my problem. When I first get in my car and turn on my stereo the sub will not play. So with my gain set at 1/2 I move it back and forth and as soon as I move it the sub will turn on, but then the sub will fade in and out like I was turning the gain up and down. Is something wrong with the gain control? What's going on here? Amp is an old school crossfire cfa202.

Copchaser

iTrader: (2)

Where are your EQ settings on the HU? What size and how many subs is this amp pushing? Where are your grounds and are they secured? True metal to metal? How thick is your speaker wire goin to sub(s) from amp. Are other speakers (mids and highs) running off an amp or straight from the HU?

GeeJenn91RSV8

Grounds are secure.. bolted to the spare tire bracket. I drilled a hole and scraped the paint so its metal to metal. I'm pushing one kicker c12 bridged right now. I had two c12s running in stereo and had the same problem. Why does the sub turn on as soon as I touch the gain?

firebird904

I had this problem with cheap rca cables check and make sure they don't look burnt one of mine was black.

Copchaser

iTrader: (2)

Internals in the amp would suggest a loose soldering connection. If your EQ settings on HU are set too high, you will automatically overload the amp and output would be skiddish also. .

DROBECO

yeah cheap rca's are a culprit in this situation a lot of times i think we've all been there. try wiggiling them around see if connection improves.

GeeJenn91RSV8

I'm gonna take a closer look at my rca cables. If I see any sign of a problem I will replace them. Thanks

Chevy86 IROC-Z

iTrader: (17)

All the info here is just wrong. Your amp is not working correctly. The other member said that the soldering may be bad as in the metal has completely seperated from the solder blob that in on the circuit board. If the bass control and bass volume (if equipt) on the stereo is set too high, you can easily counter those levels with the gain setting. Food for thought. Some amps have gain settings, Level settings, sub-sonic filter, and a frequency switch (high pass and low pass). If you got a Mono Block, then all you will receive is strickly bass frequencies. Now lets get back to the basics. What you have to do is get a battery to check the if the subs are working correctly. Get a 9 volt square one and connect it in line with each sub. The sub should either raise or fall depending on the direction of the polarity. If it moves up and down in one straight shot, then the sub is good and does not have a destroyed voicecoil. Now lets check the rca cables. You can have the cheapest rca's but aslong as the outer wiring is wrapped around the center core, then it is shielding the main lead. This stops unwanted magnetic and electrical noise from radiating into the feed signal. So cheap is good, just make sure that it is "shielded." Now get a multi meter and have 2 wires with alligator clips at each end.Your gonna wanna to check the continuity of the rca's just to make sure that the rca's are not cut somewhere inside. If all is good, lets mon=ve to the stereo and amp. Set the stereo's bass level to the middle. Lower the amps level and gain (or just gain) to its lowest. Now turn the stereo all the way down. Then slowly raise the volume to the stereo until you hear the music. When you can barely here the music, then go to the amp and raise the gain till you can barely hear the bass. Once you have the 2 adjusted, then you have "matched" the levels to a setting that will not destroy the amp and subs. Now raise the volume on the stereo as loud as you will play it. Then you can adjust the "level setting" on the amp for increased volume. Now if the amp still ONLY works when you "touch" the ****, then your amp is faulty in that area of the ***** circuitry. An electronics repair man can verify it for free if you have the amp open and ready for inspection. If not, there may be a $10 fee for inspection. Good Luck.

camarito

broken soldering connections on the board that's my bet, i had one with the same problem.

GeeJenn91RSV8

Ok guys. After closer inspection of my rca cables I did notice that if I wiggled the connection by the amp the music would fade in and out. So I installed a new set of cables and all seems to be well. Thanks for the input.

Chevy86 IROC-Z

iTrader: (17)

Nice.