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214 Posts
As I get increasingly frustrated with the audio shop that has been working on my '02 Coupe w/NAV stereo upgrade, I am asking for anyone who has experienced a successful upgrade to provide detail into what was done. (Not just "had an amp and sub put in") Where was the amp placed in the signal path for one, before or after the internal amp?
This was the shop recommended by the FM dealer, BTW.
Originally the installer used peripheral line output convertors from the head unit to a four channel amp. After no less than 3 attempts, he was unable to get the noise out of the signal (the whine that pitches up with RPM).
He is now telling me that the signal from the Headunit to the amplifier is a digital signal, and the CANBUS is the source of the noise he was unable to filter. So he thinks he needs to take the amplified signal out of the internal amp and use a signal summing and EQ flattening piece like the JL Cleansweep or new Alpine PXE-H650 into the new external amp.
I've lost my confidence in this guy's expertise, but am already somewhat heavily invested in him, so it would be preferable not to just walk away and get another opinion.
Even with one these sound processor units, I'm still concerned about the quality of the sound out of the head unit (junk in/junk out), not to mention the terrible radio reception...
This was the shop recommended by the FM dealer, BTW.
Originally the installer used peripheral line output convertors from the head unit to a four channel amp. After no less than 3 attempts, he was unable to get the noise out of the signal (the whine that pitches up with RPM).
He is now telling me that the signal from the Headunit to the amplifier is a digital signal, and the CANBUS is the source of the noise he was unable to filter. So he thinks he needs to take the amplified signal out of the internal amp and use a signal summing and EQ flattening piece like the JL Cleansweep or new Alpine PXE-H650 into the new external amp.
I've lost my confidence in this guy's expertise, but am already somewhat heavily invested in him, so it would be preferable not to just walk away and get another opinion.
Even with one these sound processor units, I'm still concerned about the quality of the sound out of the head unit (junk in/junk out), not to mention the terrible radio reception...