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Discussion Starter #1
Thanks for all the info i got on this site. The problem for me is, the more i learn here, the more possibilities i see, and the more questions i have.

My dilemma now is this: I have an '05 300C, RAQ, Sound Group II, 8 speaker and amp. I am getting a Kenwood DNX7120 nav unit, Infinity Kappa 6x9's for the rear, and an Infinity 475A amp.

Would it be better to
A) remove the factory amp alltogether, and use the Kenwood preamps into the Infinity amp to run rear and dash speakers, or

B) run Kenwood radio rear preamp to the Infinity amp for the rear speakers and run the front preamp to the stock amp for the dash and doors. If i remove the stock amp, will it have any negative effects on any other part of my system, like steering controls? i want a simple setup when i am done, with as little disassembly of the car for running all the wires as i can do.
 

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Being that you are getting the products you are, why not
get an extra set of speakers for the front.

Then, put in your kenwood, feed preamp front and rear
to your amp, the amplify your new front speakers and new
rear speakers.

The amp doesn't impact your steering wheel controls. But
you will need to add the appropriate adapters that let
the steering wheel controls work with your kenwood.
 

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Discussion Starter #3
but...

But then how would i get door speakers working.

My new amp has four outputs, how could i run the door if i send front output to the dash speakers?

I am thinking of removing the stock amp altogether, and seeing if the Infinity amp will fit there in the space.

Can i get a wire harness connector to let me connect my aftermarket amp to the 300C wiring harness so i dont have to cut the harness off if i use the stock wiring that is already there?
 

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But then how would i get door speakers working.

My new amp has four outputs, how could i run the door if i send front output to the dash speakers?

I am thinking of removing the stock amp altogether, and seeing if the Infinity amp will fit there in the space.

Can i get a wire harness connector to let me connect my aftermarket amp to the 300C wiring harness so i dont have to cut the harness off if i use the stock wiring that is already there?
There is no harness that does that. I don't recommend cutting to
add an amp.

If you have the kenwood you just need to connect the rca's to the amps
inputs.

Then you unplug the harness from the stock amp, and tap into the
speaker leads that were plugged in on the output side of the stock amp.

If you go this route, I suggest you replace your dash and door speakers,
and wire them together at your infintity's front output.
 

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Discussion Starter #5
There is no harness that does that. I don't recommend cutting to
add an amp.

If you have the kenwood you just need to connect the rca's to the amps
inputs.

Then you unplug the harness from the stock amp, and tap into the
speaker leads that were plugged in on the output side of the stock amp.

If you go this route, I suggest you replace your dash and door speakers,
and wire them together at your infintity's front output.
If i wire the fronts and doors together at the amp, wont that change the impedence that the amp sees, and might there be a problem where the speakers only are getting half the power?
 

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If i wire the fronts and doors together at the amp, wont that change the impedence that the amp sees, and might there be a problem where the speakers only are getting half the power?
wiring the dash and door together is not a problem IF AND ONLY IF
you have an amp that can handle the lower impedance this will cause.
But this is why in my previous post I suggested replacing the stock speakers in the dash and door. The most common impedance for car stereo speakers will be 4ohm. Wiring them in parallel will be 2ohm, a load that most amps can handle.

How much power each speaker gets is a function of the amp. There are
amps that increase output as the impedance is dropped, some remain
at the same output.

Example:

JL slash slash series: 300/2 will be 2x150 regardless of whether you
wire the speakers together or not.

Phoenix gold titanium series: Ti400.2 will be 2x100 at 4Ohms but 2x200
at 2Ohms

I chose the above examples because I'm familiar with them and believe
them to be very good products.

Or you could get 1 component set and place the mid in the door and
the tweeter in the dash.

That saves the number of amp channels necessary.
 

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Discussion Starter #7
wiring the dash and door together is not a problem IF AND ONLY IF
you have an amp that can handle the lower impedance this will cause.
But this is why in my previous post I suggested replacing the stock speakers in the dash and door. The most common impedance for car stereo speakers will be 4ohm. Wiring them in parallel will be 2ohm, a load that most amps can handle.

How much power each speaker gets is a function of the amp. There are
amps that increase output as the impedance is dropped, some remain
at the same output.

Example:

JL slash slash series: 300/2 will be 2x150 regardless of whether you
wire the speakers together or not.

Phoenix gold titanium series: Ti400.2 will be 2x100 at 4Ohms but 2x200
at 2Ohms

I chose the above examples because I'm familiar with them and believe
them to be very good products.

Or you could get 1 component set and place the mid in the door and
the tweeter in the dash.

That saves the number of amp channels necessary.
Can anyone advise if the Infinity 475A amp can handle this setup?
 

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If you go with aftermarket speakers the 475A can handle the load.
With the stock speakers the impedence may be too low. I can
take a measurement to confirm.
 

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Discussion Starter #9
If you go with aftermarket speakers the 475A can handle the load.
With the stock speakers the impedence may be too low. I can
take a measurement to confirm.
Can i run:

kenwood rear pre-outs to amp to rear speakers

kenwood front pre-outs to amp to door speakers

kenwood regular output speaker leads to dash speakers (unamplified)
 

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yes, that would work. Does your kenwood have the system E
crossover? if so, does it also filter the speaker outs? that may
be something may or may not need, but the dash speakers may
not tolerate bass very much.
 
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