Factory Headunit sound quality Dropped with Aftermarket AMP , Speakers & Sub
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  • 1 Post By Chris Tobin

Thread: Factory Headunit sound quality Dropped with Aftermarket AMP , Speakers & Sub

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    SCruze is offline [OP]
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    Unhappy Factory Headunit sound quality Dropped with Aftermarket AMP , Speakers & Sub

    Hello Folks,

    I've installed an Aftermarket AMP , Speakers & a Sub. The thing is that my sound has got Loud, but the problem is the Sound quality has dropped significantly and the Tweeters are sounding Harsh now.

    My Factory system was: Single din Headunit & four speakers as you know.

    Parts I've installed on the Factory Headunit:

    Fronts: JBL GTO609C
    Rears: JBL Stage 602E
    Sub: JBL CS1214T In-Car Bass Subwoofer Tube
    Amplifier: Pioneer GM-D9605 (75 wattsx4 @4 ohms)
    Wires: I believe 7 awg power cables & 15 AWG Ground Zero Cables.

    IMAG0333.jpg IMAG0334.jpg IMAG0335.jpg

    Ok so here is the Problem, the sound has become louder but then when i increase the Volume beyond 20 or so I'm hearing the tweeter Scream in my ears and of course Midbass isn't present much.

    I've set the gains below normal which improved the sound quality but still it's sounding worse than the Original Setup.

    The Installer said that the my OEM Headunit has Low output Voltage so it's gonna sound like trash no matter what parts I install or do with it. He also Insisted that my AMP is Crap and needs to be changed to get more power.

    I can believe on the 1 st argument of the OEM Headunit with low output voltage, but the 2nd argument that my AMP is Underpowered or bad isn't true I feel. The Pioneer Amp puts out 75 watts x4 RMS @ 4ohms and my JBLs are 3 OHMS, & I'm running this on Bridged mode already.

    But I would like to know what's the issue? Why is the sound quality bad at moderate to high volumes even after instaling amp , speakers and sub?

    Demo:



    The sound is lacking the Fullness or say Depth. What's the problem here? Any suggestions to improve the sound?

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    The radio was tuned to match the stock speakers. Apparently that tune is the wrong thing for your new speakers.

    I'm not buying into the theory that the stock unit has low output. Low output would translate into low volume. But that's not your problem. Notice that XtremeRevolution is using a DSP to re-tune the output to match the speakers he's using.
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    SCruze is offline [OP]
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    Quote Originally Posted by ChevyGuy View Post
    The radio was tuned to match the stock speakers. Apparently that tune is the wrong thing for your new speakers.

    I'm not buying into the theory that the stock unit has low output. Low output would translate into low volume. But that's not your problem. Notice that XtremeRevolution is using a DSP to re-tune the output to match the speakers he's using.
    Some1 else also suggested me to get a DSP for my Cruze, but will i notice a Huge Difference in Sound Quality if I Add a DSP?

    Is it worth the Price? I can get a Ground zero DSP installed for $544 from a local car audio shop.
    Last edited by SCruze; 11-23-2017 at 04:42 AM.

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    Quote Originally Posted by SCruze View Post
    Some1 else also suggested me to get a DSP for my Cruze, but will i notice a Huge Difference in Sound Quality if I Add a DSP?
    Yes, but keep in mind that the DSP is just the tool. You'll need to find someone who can use it to tune the sound system. Depending on the skill, it could sound great, or it could be horrid.
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    Quote Originally Posted by SCruze View Post
    Some1 else also suggested me to get a DSP for my Cruze, but will i notice a Huge Difference in Sound Quality if I Add a DSP?

    Is it worth the Price? I can get a Ground zero DSP installed for $544 from a local car audio shop.

    $544???? Have you really read this?

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    For what it's worth I copied XtremeRevolution's build pretty much to a "T" (including the 18" subwoofers) and noticed instantly that the factory HU and PAC LOC I was using had very low output voltage which caused me to have to turn the gains on my amplifiers up pretty far. While this made it so I could achieve an acceptable volume level it also introduced a ton of noise and caused my noise floor to be quite high.

    I have since decided to quit using the factory HU for music and installed an Android tablet. The tablet runs via USB audio to a portable USB DAC that connects to my MiniDSP C-DSP 6x8 that feeds my 3 amplifiers. With this setup I have an all digital signal running to the back of the car.

    I should update my build thread. I've made a bunch of changes since my last post.

    Sent from my SM-G955U1 using Tapatalk

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    2nd Gear Chris Tobin's Avatar
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    Quote Originally Posted by SCruze View Post
    Hello Folks,

    I've installed an Aftermarket AMP , Speakers & a Sub. The thing is that my sound has got Loud, but the problem is the Sound quality has dropped significantly and the Tweeters are sounding Harsh now.

    My Factory system was: Single din Headunit & four speakers as you know.

    Parts I've installed on the Factory Headunit:

    Fronts: JBL GTO609C
    Rears: JBL Stage 602E
    Sub: JBL CS1214T In-Car Bass Subwoofer Tube
    Amplifier: Pioneer GM-D9605 (75 wattsx4 @4 ohms)
    Wires: I believe 7 awg power cables & 15 AWG Ground Zero Cables.

    IMAG0333.jpg IMAG0334.jpg IMAG0335.jpg

    Ok so here is the Problem, the sound has become louder but then when i increase the Volume beyond 20 or so I'm hearing the tweeter Scream in my ears and of course Midbass isn't present much.

    I've set the gains below normal which improved the sound quality but still it's sounding worse than the Original Setup.

    The Installer said that the my OEM Headunit has Low output Voltage so it's gonna sound like trash no matter what parts I install or do with it. He also Insisted that my AMP is Crap and needs to be changed to get more power.

    I can believe on the 1 st argument of the OEM Headunit with low output voltage, but the 2nd argument that my AMP is Underpowered or bad isn't true I feel. The Pioneer Amp puts out 75 watts x4 RMS @ 4ohms and my JBLs are 3 OHMS, & I'm running this on Bridged mode already.

    But I would like to know what's the issue? Why is the sound quality bad at moderate to high volumes even after instaling amp , speakers and sub?

    Demo:



    The sound is lacking the Fullness or say Depth. What's the problem here? Any suggestions to improve the sound?
    I know it is late to help you, but maybe it will help someone else... Weak bass/midbass is often caused by phasing issues. Roll the balance control to full left or full right and see if the midbass improves, you can take it a step further by fading to all front or rear to further isolate the speakers. If the midbass/bass improves you are experiencing phase related cancellation where the left and right signals are out of phase and the lower frequencies are cancelling each other out. Give it a try... If it is better simply swap the polarity of one channel and that could offer a great improvement.

    This issue could also rear its ugly head on the output from the head unit and input to the amp if the installer wired it incorrectly...
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    Chris Tobin
    Editor--Ultimate Diesel Builder's Guide magazine
    Contributor to Diesel World, Street Trucks and more

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