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Old 07-15-2011, 08:33 PM   #1
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Help with Mach460 Audio

I have a 2003 GT 'vert with the Mach460 system. I replaced the head unit with a Kenwood KDC-HD545U CD Receiver. I left the Mach460 ams in the rear. Needles to say I think I made a mistake doing that. The base sounds flat, like the subs are over powered. The system also sounds kind of muffeled. I'd like to upgrade the speakers, subs and possibly the amps. Anyone have any suggestions? My budget is about 7-800 dollars.

Does anyone have any suggestions??
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Old 07-15-2011, 09:56 PM   #2
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How did u connect the head unit. Did you use a wiring harness that matched the factory plug?
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Old 07-16-2011, 07:59 AM   #3
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Re: Help with Mach460 Audio

Yes I purchased a harness adapter from Crutchfield.
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Old 07-16-2011, 01:08 PM   #4
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Quote:
Originally Posted by joestang406
Yes I purchased a harness adapter from Crutchfield.
I'd call crutchfield, they know what they're talking about
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Old 07-16-2011, 05:27 PM   #5
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Re: Help with Mach460 Audio

I did. THey recommend replacing the remainder of the system, Amp front and rear speakers.
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Old 07-17-2011, 02:50 AM   #6
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Quote:
Originally Posted by joestang406
I did. THey recommend replacing the remainder of the system, Amp front and rear speakers.
Try talking to another crutchfield associate. You should be able to change head units and still run the.stock amps and subs just fine
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Old 07-17-2011, 03:47 AM   #7
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I know what's wrong... Doesn't the headunit put out 4x18ish watts at 4 ohms? The speakers you have are 8 ohm speakers....
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Old 07-17-2011, 07:29 AM   #8
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I put an amp and two 12s in my 04 GT back when it was brand new. I decided to have it professionally installed. When they gave me back my car, the subs were barely hitting and sounded weak & terrible. After flipping out on the manager for telling me it was the Mach460s fault, a dude from the back came out and switched the wires.

Turns out they had installed it in a hurry and didn't really test it out. But my point is that my speakers sounded like crap, and flipping the wires was all they needed.

The above comment about ohms is much more technical and is probably what the problem is, but just for kicks you might check the wiring on that harness again.
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Old 07-24-2011, 11:16 AM   #9
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Re: Help with Mach460 Audio

So all I need to do is replace the speakers??
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Old 07-24-2011, 01:20 PM   #10
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Instead of using the speaker out from the head unit use the RCA output your output level is to hi for the input level to the stock amps they take a max of of about 3 volts input
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Old 07-24-2011, 01:39 PM   #11
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Originally Posted by Las0mbra
I know what's wrong... Doesn't the headunit put out 4x18ish watts at 4 ohms? The speakers you have are 8 ohm speakers....
That doesn't matter he has a system the speakers are getting power for the 460 amp not the amp in the head unit
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Old 07-24-2011, 01:43 PM   #12
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Originally Posted by Drodriguez2009

That doesn't matter he has a system the speakers are getting power for the 460 amp not the amp in the head unit
Therefore it should still work like a stock setup you should not be able to tell a difference think about if you have a kick *** system and your stereo goes out you replace it and thats it maybe tune the radio but the speakers were never getting power for the stereo amp but from the after market amps
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Old 07-29-2011, 09:06 PM   #13
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Re: Help with Mach460 Audio

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Originally Posted by Drodriguez2009 View Post
Therefore it should still work like a stock setup you should not be able to tell a difference think about if you have a kick *** system and your stereo goes out you replace it and thats it maybe tune the radio but the speakers were never getting power for the stereo amp but from the after market amps
I spoke to a tech at crutchfield again and he said that the harness prevents the head unit from "seeing" the speakers. The amp is what is sending the signal to the speakers. So if the harness is wired correctly it should be OK. Also told me to check some settings on the head unit. I made a few changes and it does sound much better. I also noticed that the head unit does not have a High Pass Filter, that means that the tweeters may be getting some bass signal, which at moderately loud levels can cause distortion.

So my task for this week end is to take the head unit out, check the wiring on the harness and possibly install some bass blockers on the 4 tweeters.
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Old 07-30-2011, 12:15 PM   #14
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+1 see
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