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Subwoofer sounds like a loud speaker with very little bass


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My brother recently had an amplifier and subwoofer installed in his 2010 bmw 328 with the base factory radio with no factory amp. I tried adjusting the settings on the amplifier but the sub still sounds horrible. I decided to take the sub out and swap in mine, his subwoofer in my car sounded great but my subwoofer sounded like shit in his. What i am wondering is can high level inputs cause this problem or could it be because of the shop who installed it? MY brother's sub and amp were installed by a local "professional" shop and my backyard install on my 2009 bmw 335 with a loc puts it to shame. 

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Sounds like your LPF is off. Make sure it's on and set it to 80hz for starters, then adjust as necessary.

2007 Pacifica
Rebuild. Less quiet. Still not loud.

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49 minutes ago, 06RTCharger said:

If theres lots of vocals and highs and no bass coming out of a sub, id think that meant the crossover points were messed up. Check what the amps crossover is at. 

 

31 minutes ago, srp365 said:

Sounds like your LPF is off. Make sure it's on and set it to 80hz for starters, then adjust as necessary.

I turned the high pass filter all the way down, turned the low pass on it had more base but the vocal were still there. I figured from personal experiences on both of my cars that it was the high pass filter that was messed up but i couldn't get the vocals to go away. 

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You are gonna hear some vocals unless your LPF has a steep slope, which it likely doesn't. 

HPF. should be off.

2007 Pacifica
Rebuild. Less quiet. Still not loud.

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4 hours ago, Joey5395 said:

Yeah I checked his car doesn't have an factory amp, and I couldn't find where they tapped the wires into. 

If you drop the lpf all the way does it still sound like shit? If so just take it back and have them look at it, if its non-amplified then the signal shouldn't be too bad since its full range. If you decide to do a little troubleshooting yourself then this may help.

 

 
 
 
12V
Radio Ground
Radio Ignition
Radio Illumination
Factory Amp Turn-on
Power Antenna
Left Front Speaker (+/-)
Right Front Speaker (+/-)
Left Rear Speaker (+/-)
Right Rear Speaker (+/-)
Center Channel (+/-)
Subwoofer (+/-)
Aux. Audio Input Left (+/-)
Aux. Audio Input Right (+/-)
Satellite Radio 12 Volts
Satellite Radio Ground
Satellite Radio Ignition
Satellite Radio Antenna
Satellite Audio Left (+/-)
Satellite Audio Right (+/-)
space.gif
space.gif
Wire Color
red/green
brown
(CAN BUS)
gray/red (dimmer)
same as power antenna (HiFi); (MOST BUS, Top HiFi)
black or white/purple
blue/white - blue/brown or yellow/red - brown/org
blue/black - blue/brown or blue/red - brown/orange
yellow/red - yellow/brown or yellow/blk - brn/org
blue/green - blue/brown or blue/black - brown/org
black/white - black/brown
red/wht - brown/yel (L); red/blue - brown/wht (R)
white - (shield) or black - (shield)
gray - (shield) or yellow - (shield)
red/blue
brown
(MOST BUS)
(coaxial cable)
(MOST BUS)
(MOST BUS)
space.gif
space.gif
Polarity
+
-
 
+
 
+
+,-
+,-
+,-
+,-
+,-
+,-
+,-
+,-
+
-
 
 
 
 
space.gif
space.gif
Wire Location
radio, 16 pin plug, pin 15
radio, 16 pin plug, pin 12
 
radio, 16 pin plug, pin 14
 
radio, 16 pin plug, pin 13
radio, 16 pin plug, pins 3 - 7
radio, 16 pin plug, pins 2 - 6
radio, 16 pin plug, pins 4 - 8
radio, 16 pin plug, pins 1 - 5
amplifier in left side of trunk, 20 pin plug, pins 5 - 15
amplifier, 42 pin plg, pins 4-3; 23-22, or 20 pin plug, pins 8-18; 6-16
radio, 12 pin plug, pins 2 - 8
radio, 12 pin plug, pins 7 - 8
Sat Radio under trunk floor, 3 pin plug, pin 1
Sat Radio under trunk floor, 3 pin plug, pin 3
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No. That will not cause your issue. The signal for the amp is likely tapped into a source that is filtering out the lower notes. 

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