Adding a system amp with stock Synthesis...

[Offroader5]

Alright, so I'm not sure if this has been tried before...most of the threads I came up with in search were only an addition of a sub amp or the complete gut and replace of the whole OEM system.

At this point, I don't see the need to replace the stock JBL NAV HU....it's the speakers and frequency handling that need more attention IMO. I'm going to replace all the speakers with far better candidates, but as far as adding a new amp to power the whole system...these are my thoughts:

-Cut the speaker wires where they exit the OEM amp.
-Connect the speaker output wire stubs that exit the OEM amp to the speaker level inputs of a new amp.
-Connect the leads that go to each speaker (since they have been cut away from the OEM amp) to the speaker output connections of the new amp.

Thing I'm not sure of, is if the OEM amp sound processing output signal is going to be a problem for the new amp as an input signal. I don't THINK it will be an issue since speaker level inputs are meant to be hooked up right to a HU anyway which usually has some sort of processing or internal amp as it is.

My plan is to use a new 5 channel amp to power each door and the sub. I'm not going to even worry about the center channel and rear pillar speakers and will re-purpose these as CB and 2 meter external speakers.

So....anyone tried??

 

[haganwalker]

I believe you're setting yourself up for alot of work and troubleshooting. In theory it should work, but like you said, being already processed sound once, the second amp might interfere with the sound and make it low quality. I almost wonder if you could start replacing the speakers, and if the sound is still bad with the OEM amp, then go to phase two! and keep us posted...I am curious to know...I will be doing an amp and sub install myself to get rid of the terrible JBL sub in my 2006

 

[Offroader5]

Haha...I didn't even want to screw with it. I'm just replacing the whole system from front to back. I've already swapped out the HU with an aftermarket and have plans for how the layout of drivers is going to end up. At this point, I'll be buying individual drivers to get the best setup vs. buying coax or comp sets. The only part of the OEM system I'll be reusing is the sub enclosure (with modifications)

 

[Bright_Light7]

Keep posted. I'm in the beginning stages of drawing out my plans to re-do my JBL sys in my 03 4R.