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Old 02-10-2012, 10:03 PM
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Good speakers can sound bad.

I need some help to finalize my new stereo system.
A couple months ago I installed a new head unit with navigation. I thought at first I would just stop right there but I couldn’t stand that I was listening to stock speakers with an improved power system. So I thought a couple hundred in new speakers would be the last step. Last week I installed new speakers in the sound bar and front dash. Instant gratification.

The next day driving to work and soaking it all in with a little extra volume to cover the road noise and then “cough cough” at the first low base thump. I get it home in the garage and experiment. All four speakers get this nasty “CB static” noise with the volume crank a little and a nice base note hits.

Here is where I think the problem may be: I still have factory wiring. I was little concerned with the feel of the ¼” spades when I slipped them on the speaker terminals. They didn’t feel as tight as the 1/8” spades. The speakers are over powered for the head unit.

Here is info on my equipment:
HEAD UNIT: JVC KW-NT30HD Navigation receiver
RMS Power Output: 20watts
RMS Power Bandwidth: 20-20kHz
Peak Power Output: 50
Preamp Outputs: 5-Channel
Sub Preamp Outputs: Yes, 2.5 volts
FRONT SPEAKERS: Polk Audio DXi 650s 6-1/2" 2-way shallow-mount car speakers
Sensitivity: 92 dB at 1 watt ?
Frequency Response: 50-20kHz
RMS Power: 6-55 watts
Peak Power: 165 watts
SOUND BAR SPEAKERS: Infinity Reference 6032si 6-3/4" shallow-mount 2-way car speakers
Sensitivity: 93 dB at 2.83 volts ?
Frequency Response: 53-21kHz
RMS Power: 2-50 watts
Peak Power: 150 watts

What do I need to do now? Amp and wires? I can handle keeping the volume down now but it won't be acceptable topless.

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Old 02-10-2012, 10:17 PM   #2
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That's the sound of distortion/clipping.. It's from you trying to squeeze too much "volume" out of a small amplifier inside the nav unit..

Stuff the speaker cavities with polyfill... and amp them biatches!!

Make sure you set the amp gains correctly using a MultiMeter.. this will help you avoid any further distortion.. distortion and clipping are HUGE causes of speaker damage..

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Old 02-12-2012, 08:22 PM
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Originally Posted by I-Want-A-Jeep View Post
That's the sound of distortion/clipping.. It's from you trying to squeeze too much "volume" out of a small amplifier inside the nav unit..

Stuff the speaker cavities with polyfill... and amp them biatches!!

Make sure you set the amp gains correctly using a MultiMeter.. this will help you avoid any further distortion.. distortion and clipping are HUGE causes of speaker damage..
Amping those biatches is on the way. I have a Polk amp mounted already under the driver's seat. Wires are sitting in the garage just waiting to get run. Hopefully this time next week it will all be jamming.

One other note: I took the Infinity's back. While checking out amps at Best Buy I got to talking to an installer and he gave me lots of info to chew on. He told me the Infinity speakers were 2 ohm impedance and the Polks and just about all other speakers are 4 ohm. He said he thought that might cause some issues. So Polk Audio all around. They were easier to deal with anyway. They came with mounting screws.
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Old 02-13-2012, 08:23 PM   #4
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Yeah connecting 2ohm speakers to almost any stock setup usually doesn't work very well..

Let us know if you need more help!
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Old 03-04-2012, 10:56 PM
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Yeah connecting 2ohm speakers to almost any stock setup usually doesn't work very well..

Let us know if you need more help!
OK, after about three weeks the amp sitting under the seat waiting on wires I finally hooked it up this weekend.

AWESOME!!!

Anybody with the basic sound system thinking about changing out the head and speakers,
maybe thinking about adding an amp,
STOP THINKING ABOUT IT AND JUST DO IT.

And what a learning experience. I'm really glad I did it myself.
One with the jeep, man. A jeep that absolutely rocks.
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