Alpine 9887 Pre-Out Voltage Problem

[jonny101abc 10+ year member]

hey everyone

ok heres the problem

i finally connected everything together, and there is no out put from the sub, until gain and volume are at max setting.

i tested the pre out voltage from the head unit, and it goes as follows

front 3.364v

rear 3.410v

sub 0.599v

why is the sub out put so low, is there something very wrong with the head unit or some thing else.

thanks

Click to read more...

 

[blazeplacid 10+ year member]

is the sub out put on the headunit set at max?

 

[Trepkos 10+ year member]

hey everyone
ok heres the problem

i finally connected everything together, and there is no out put from the sub, until gain and volume are at max setting.

i tested the pre out voltage from the head unit, and it goes as follows

front 3.364v

rear 3.410v

sub 0.599v

why is the sub out put so low, is there something very wrong with the head unit or some thing else.

thanks

Sounds like the same problem with my old kenwood kdc x791.

 

[jonny101abc 10+ year member]

the sub level is on max which is 15

what was the problem with the kenwoods

 

[PaulD 10+ year member]

are you sure you have the subwoofer output turned on ? and everything else like the crossover and subsonic fiters turned off ......

 

[msimon 10+ year member]

How did you test your pre-out voltage?

Without telling us your method, just posting numbers does not help at all.

 

[blackbonnie 5,000+ posts]

sounds like your sub is turned off, even though its on max, it can still be turned off. read the manual to correct this issue

 

[MikeyB 5,000+ posts]

Also make sure the sub rca's are connected to the sub rca's on the deck, not front or rear.