lisnup65 said:The problem with adding a new amp to the factory system is as follows:
The factory speakers suck and will not handle much more than thier rated 15/30 watts of power.
-The front speakers are a simple 2 way design that the factory amp limits the high-pass frequency to the set and then their is a 6db cap that limits what the tweeter gets. You can simply add an amp that has a highpass X-over set around 90/100 Hz and you will be fine.
-The rear speakers though are a bit tricky as you have a 6*9 with a stacked mid/tweeter. It is a Bi-amplified system which means the factory amp feeds each speaker with its own channel of power. The factory amp is not a true 6 channel amp. They use X-overs built in and send each speaker its designated frequency. The woofer is a 2ohm speaker thus allowing the amplifier to create more current for more power than the 4 ohm mid. You cannot simply hook a 4 channel amp up and be good to go unless you left either the rear 6*9 or the rear mid disconnected. The reason behind this is because the new amp may have a cross-over built in, it cannot through a single channel split the single into 2. A 6 channel amp would make install easier, but for the cost its not worth it as you would be better off replacing the factory speakers.
-To sum up the rear speaker problem is as follows.
--You need a custom built cross-over network if you wish to use 2 channels to drive the 4 speakers in the rear.
--6*9 should have a cross-over designed for 2 ohms. The design should be bandpass at 50-500/1000Hz.
--Mid-range x-over should be a high pass design at (I recommend) 1000Hz
-If you just hook up 2 channels to all 4 speakers this is what will happen.
--The amp will see a 1.33 ohm load and most likely the amp you have is not capable of running this load.
--The power the amp would produce at 1.33 ohms will smoke the cheap factory speakers.
--The full range signal will smoke the factory speakers as they have limits and are not designed for full range.
Now if we factor the cost of the cross-overs it is cheaper and a better sound quality choice to simply replace to even a set of coaxial's.
Does this now make more sense?