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100 Posts
Discussion Starter · #1 ·
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.

Audio equipment Electronics Electronic device Technology Loudspeaker
Audio equipment Electronics Subwoofer Loudspeaker Technology
Audio equipment Electronics Electronic instrument Technology Electronic device

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?


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

100 Posts
Discussion Starter · #3 · (Edited)
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.
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