How to install component to stock car

[Blueshark2k]

I have a Lexus ES350 with a Mark Levinson OEM amplifier (10 channels) that control the 13 speakers on the car. Recently, i've added an aftermarket woofer plus amplifier to the system via a LOC device. But now, i want to replace the door speaker and tweeter with my old Infinity component without adding a 3rd amplifier to the car. Note that the oem door speakers are wired into the stock amplifier. I would like to remove them and swap with this:

Infinity - Car Audio

the manufacturer state to power the speakers with at least 50wrms/speaker for best performance and i think that the OEM door speaker only give up around 20wrms.

My questions are:

1. how can i wire the Infinity component to the oem wiring ?

2. Will i see a difference considering i'm not using the proper wattage suggested by the manufacturer ?

The car has an alternator rated for 130amp and my amplifiers are taking 600wrms or 90 amps. I don't crank up the volume all the time, i'm into more of SQ.

thank you very much in advance for you helps for answering some of my questions and maybe redirect me with the proper links.

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[*SlappinAzz*]

take your factory speaker wire, and put it to the crossover. Then take new wire, and run from crossover to speaker. Also best to power externally using a 4 chnanel

 

[misfit138 5,000+ posts]

Yeah, I'm not a fan of using tiny amounts of power for component speakers. If you want a serious sound system, you'll need to bypass that factory amp and install something with a little more balls...

 

[fasfocus00 5,000+ posts]

you're going to need to see what impedance your stock speakers are first. if they are of equal impedance as the speakers you're going to replace, than it's just remove old one and place new one. if they are not you're going to need an electronic LOC with summing capabilities and add an amp that will power the new components. your car amp has your speakers actively crossed so it's not so easy as remove and replace if they impedance isn't equal.

 

[Blueshark2k]

GREATLY appreciate your inputs. My oem speakers are 4ohm same as the Infinity, fitting is not a problem, but the low wattage given my the stock amplifier maybe is. Although the 20wrms door speakers are rated low, the full assemble in the car does make it sound strong, but i want some clarity in the front.

So if i understand correctly, put the +/- oem stock door speaker wires into each crossover and that's it ? what about the stock tweeter wires ?

thank you.