Upgrading stereo help/suggestions

[BadAngel]

Well, its summer again... and i have a job... which means its time to spend money on the Solara xD...

Well as of right now.... i have the stock JBL system, that i added a sub $ amplifier to using the Scosche in line converter to tap into the rear speakers...

Now i want to add a whole new head unit because there are so many little things that annoy me about the stock one... I hate the built in equalizer (if you could call it that... it barley gives u any control over the sound. I have my ipod hooked up through an fm transmitter and i hate the horrible sound it has so i want the ipod to plug straight in. And i want to be able to control the ipod from my steering wheel controls. Now... i have done quite a bit of research and heres what i came up with:

Head Unit:
http://www.pioneerelectronics.com/PUSA/ ... H-P4000DVD

steering wheel control adapter:
http://cgi.ebay.com/PAC-SWI-PS-fits-Pio ... dZViewItem

After reading about how others set up their stereos, i decided i want to keep the stock amplifier since i am not changing any of the speakers... the only way to do this that i found is through a product like this:
http://www.crutchfield.com/App/Product/ ... SR&tp=3486

Now here come the problems... Crutchfield says its compatible with my 2004 JBL system, but the actual scosche instructions say it only works with 06-07... Why would this be? i assumed it was the same... isn't it? If not then can someone help me find a product that will work with my 04

Also, i was wondering if i should leave my sub hooked up how it is (tapped into the rear speakers using this:
http://cgi.ebay.com/SCOSCHE-LOC80-2-Cha ... 18Q2el1247
or will i be able to run RCA's straight to this new headunit... I think it depends on if and how i can hook the JBL amp up to the headunit...

Any suggestions or answers will be greatly appreciated... Thanks!

[Sebas007]

Read from first zogg post on page 3

http://www.solaraguy.com/viewtopic.php?t=36671&postdays=0&postorder=asc&start=30

I still have some problem with this part...some weird lost of sound for a short time then come back with some weird sound. It happens randomly I'm about to remove it and replace with a amp by-pass.

[BadAngel]

hmmm... the problem seems as if it may be the fact that you are both using it with kenwood products... I dunno.. i'll have to read up on the product further... but it says its not compatible with a 2204.. i duno... If i bypass the amplifier, i am afriad that the headunit i want will not power the speakers as well as the JBL amplifier does...

these are its power specs:

Built-in Speaker Power: MOSFET 50Wx4
Continuous Power Output: 22Wx4

what else have you guys got to say?