HU & SUB HELP

[coolman91985 10+ year member]

i have a problem. when i got my system installed, the person wired my sub with my rear speakers (i think). so when i change the sound to just the front speakers, i get no bass whatsoever. i was wondering if he wired it wrong or if thats how it is supposed to be? i dont like it either way. is there a way i can fix it? someone tell me how?

thanks

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[boister77 10+ year member]

it depends on you hu. some hu's have seperate pre-outs for front, rear, and sub. if you have those options, the installer should have connected the sub to the sub pre-out so you can control it with you hu. if you hu doesn't have a sub pre-out, generally you would connect the sub to the rear pre-out. this gives you some control of the level of the sub.

 

[maylar 10+ year member]

i have a problem. when i got my system installed, the person wired my sub with my rear speakers (i think). so when i change the sound to just the front speakers, i get no bass whatsoever. i was wondering if he wired it wrong or if thats how it is supposed to be? i dont like it either way. is there a way i can fix it? someone tell me how?
thanks

That's the way most systems are. The subs are wired off the rear channels of your head unit. There are ways to avoid that, but it's kinda too late now. For instance, some head units have a separate sub-out that doesn't fade front to rear. There are also amps that have this feature, you run both front and rear lines to them and they combine the signals so the subs don't fade. I looked for aftermarket gizmos that could combine front and rear into one set of outputs but couldn't find any. Maybe someone else can point you to one.

 

[coolman91985 10+ year member]

i have the cdx-m730 hu. does that have a sub pre-out?

 

[DJ FURY 10+ year member]

According to this ur radio should have a sub pre out.

http://sm.crutchfield.com/S-57aIoIs9JzY/cgi-bin/ProdView.asp?a=&s=45&cc=01&g=300&id=features_and_specs&i=158CDXM730

 

[RoseMarysBaby 10+ year member]

well the first thing you need to do is find the friend who installed this system and smack him for me. what he did was wire the amplifiers to the rear pre-amp output instead of the amplifier output. You could get away with this on most sytems with three pre-amp outputs except on this on the rear output has a high pass filter. Which will sound very bad especially if the amp you are using does not have a built in lowpass filter. Just pull hte HU out and take the RCA cables off of rear pre-amp and put them to subwoofer out put which will have a low pass crossover.

 

[coolman91985 10+ year member]

is this hard to do? taking the hu out and changing the wires? will i have to sodler or strip any wires? or do i just unplugg from one end and plug into another?

 

[pavengmike6 10+ year member]

You will just have to pull the rcas from where they are hooked up and then connect them to the sub out put. Takes about 15 sec once you get the HU out.

 

[coolman91985 10+ year member]

is it hard to get the hu out? u need a special tool dont u?