subwoofer has no sound

[narc]

when i turn on my sub i can barely hear any sound. the amp is on and i can tell that the sub is on but the volume is very low. even when i turn up the volume on the headunit i cant even tell the sub is on. any advice?

alpinr 1241d type-r 12"

jbl px600.2 amp

alpine cda-9805

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[ghs_wrestler189 10+ year member]

turn up the gain on the amp

 

[narc]

tried, doesnt make much of a difference and can still barely hear it

 

[ghs_wrestler189 10+ year member]

make sure the RCA's are completely connected

 

[Gauntlet 5,000+ posts]

How is it wired?

 

[playa1 10+ year member]

Make sure the subwoofer control is not on 0 //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif You can do that by pressing the Volume nob in and scroll to sub-w and then turn it up...youll hear some boom after that .

 

[sumone 10+ year member]

- check volume/eq'ing/balance/fade from head unit

 

[playa1 10+ year member]

Bah im have the upgraded hu from his...im telling you its the sub control...i had the same problem

 

[HypnotizeMinds 10+ year member]

someone has already mentioned this but u should probably make sure that its not wired to 8ohms by accident. that would cause some definite absence of sound.

 

[narc]

turned the subwoofer control on the hu up, its not wired at 8 ohms, all connections are good, rcas are plugged in, still can barely tell its on. anything else?

 

[blackgeltabs 5,000+ posts]

Do you know how to use a volt meter? Start at the battery and go back, I did one setup where i used a 80amp glass fuse and it acted as a resistor. I had 14 volts going to it and about 1.7 after it.

 

[ghs_wrestler189 10+ year member]

I'm hoping the sub is in a box

 

[narc]

just checked the voltage and its fine, and yes its in a box

it seems like the amplifier is not amplifying. all power connections to it are fine and it turns on but its like there is no output. checked the fuses too and they are all working.

its like my headunit is powering the sub and not the amp.

 

[sumone 10+ year member]

do you have any other subs/amps to test with

try:

1) different sub with that amp

2) different amp with that sub

also, check the filter - is it set to high pass?

 

[narc]

no other amps or sub, tried setting the filter to every setting and no difference