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Forgot how to wire my american legacy la190 240w 2 channel amplifier to my car ?

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You need to pick up some wire. 1x Red-power with a fuseable link. 1x Black-ground, 1x 2 conection RCA wires, that will be of length to come from the back of your cd player to the place of your amplifier. and a single wire preferably BLUE to run from the MEMORY WIRE that is BLUE also and will be most likely marked on the back of your cd player. If you are trying to install this onto a stock car cd player, you only have a 10% chance it will work, because most stock stereos do not come with a RCA output jack on the rear. This set of wires can be purchased in a pack from any Walmart or car audio center.

Now take the RED WIRE With fuseable link and connect the end with the fuse to your Positive battery terminal. Now heres the hard part, you need to run this wire from inside your engine bay to your Amplifier most likely in your trunk, and to do so look for a Rubber grommet or any entry point from there into the car. After running the wire into the car, the running boards on the floor can pop out with a few screws and run the wire under the carpet, all the way to your Amp. After doing so leave that wire. Now you need to lift up your trunk floor mat and spare tire cover and look for a decent bolt that touches bare metal. THIS IS WHERE YOUR GROUND MUST GO. The ground - will need to have a good contact with metal because the amplifire recycles its energy out of the car. Now, you need to run the RCA cables and you need to run the MEMORY WIRE, this will cause you to take out your cd player and look at the back. Insert the RCA cables into the red and white holes that say Audio out or SUB OUT. Then you need to hook up the blue MEMORY WIRE from the back of the cd players harness to your Amplifiers MEMORY Port. After running all these wires the same way back as your power you can now hook up your Amp. The 12v+ needs to be hooked up to your RED POWER WIRE. MAKE SURE TO DISCONECT FROM BATTERY 1st!!! The ground wire will go onto the GROUND or - terminal on your amp. The memory insert should be between the power and ground or on the other side of the power. IT HAS TO BE HOOKED UP FOR YOUR SYSTEM TO WORK! the memeory wire is the on switch. Now plug into the RCA wire to the AUDIO IN, and your almost their. you need 2 wires for each speaker you use on this AMP. 1 + and 1- ... Run the speakers to their marked destination and your done. EVERYTHING NEEDS TO BE SCREWED IN TIGHT, use Oval wire clamps to make this a easier prosess. Now re-connect your battery and go to your cd player. ADJUST YOUR SETTINGS TO MAKE the best possible quality and turn it up. GOOD LUCK AND if this DIDNT AWNSER YOUR QUESTION PLEASE LET ME KNOW. Thank you and keep on asking questions

Posted on Sep 11, 2008

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Can my la590 American legacy 2 series 800 watt handle Boss CX122 Chaos Exxtreme 12-Inch Subwoofer 4-Ohm Voice Coils??

It is only stable to 4 ohm mono(which is 400 watts RMS or a bit less not the max rating of 800 watts which is a PMPO rating).

Your Sub would have to be wired in series(8 ohm final load, if you wire it in parallel 2 ohm-you will fry that amp).

Jan 07, 2014 | Car Audio & Video

1 Answer

Can i wire one speaker to the other speaker inside the box so that i only have one positive and one negative cable wire coming out out of the box and to the amp

Hello... I can help you with this question. Yes it is possible to do this, but you will have to use a 2 ohm stable mono block amplifier in order to do this. By connecting both positives together and both negatives together, you will be running a 2 ohm load. So if your amp is a monoblock amp, connections will be simple as tieing all the positives together and the negatives together and just hook to the amp. If you are using a 2 channel amplifier that is bridgeable, then you will need to series the subwoofers to an 8 ohm load and then bridge the amplifier to 1 channel. The way you series the subwoofers is take the positive wire in the box and hook to the positive on subwoofer #1. Take the negative wire in the box and hook to the negative on subwoofer #2. Then take a piece of wire and hook the negative from subwoofer #1 to the positive connector on subwoofer #2. Then hook the wires to the amplifier. To bridge the amplifier (if it is a 2 channel bridgeable) would be to use the left positive and the right negative, but check the amplifier for markings to confirm this. If you have any other questions, feel free to let me know and I will help you out! Hope this helps!!

20 year car audio/video installer
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Mar 22, 2011 | Kicker 05C104 Car Subwoofer

1 Answer

2 channel amp with 2 Kicker Cvrs 15"

Assuming the amplifier is 2 ohm mono stable... the amplifier is bridgeable... and the subwoofers are Single 4 Ohm Voicecoils, You would wire them as follows....

Both + on Both subs to the + bridged terminal on the amplifier.
Both - on Both subs to the - bridged terminal on the amplifier.

This will net a 2 ohm mono load for your amplifier.

If you have something different - let me know... and I will give you the proper wiring for what you have.

Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

Jun 10, 2009 | Kicker CVR12 Car Subwoofer

2 Answers

Why does my Legacy LSW157 sub-woofer have 2 inputs?

This is called a dual voicecoil subwoofer.

It gives wiring flexibility.

While playing only 1 voicecoil is possible - it is not recommended.

They should be wired to match your amplifier.

If it is 2ohm Mono stable - you can wire both positives and both negatives together to the amplifier so it sees a 2ohm load (parallel wiring)

If your amplifier is not 2 ohm mono stable - you have no option but to either wire up 1 set of coils... or wire them in series.

+ on amplifier to + on coil1
- on coil 1 to + on coil 2
- on coil 2 to - on amplifier

This will yeild an 8ohm load for your amplifier.

Good for sonic clarity - but you will not get the full potential from your amplifier.

Thanks for using FixYa - A FixYa rating is appreciated for answering your FREE question.

May 14, 2009 | Legacy LSW157 Car Subwoofer

1 Answer

Orion xtr15 to a american leagacy la 660 amp

your only choice is to run the amplifier at a 4 ohm mono load - this will not reult in the amplifier making much power.
Positive on sub to Positive on amp.
Negative on sub to Negative on amp.
This is your only possibility.

Adding a second sub in the same fashion will result in a 2 ohm load, and your amplifier will run at its rated potential.

Thanks for using FixYa - a FixYa rating is appreciated for taking the time to answer your FREE question.

Mar 05, 2009 | Orion Xtreme XTR15 Car Speaker

1 Answer

How to wire a kicker 15 cvr

175W x 2 @ 2 ohms
350W x 1 @ 4 ohm
Your amplifier is not stable @ 2 ohm bridged. So you will have to wire them independantly on each channel.
+/- on sub to +/- on L channel
+/- on sub to +/- on R channel
Wiring the subwoofers in paallel will result in a 2 ohm load, which your amplifier is not rated to do. Doing so will cause heat buildup, and damage to the amplifier.

Dec 23, 2008 | Kicker CVR12 Car Subwoofer

1 Answer


This will depend on the amplifiers capabilities.

I will give 2 different scenarios.

#1 Stereo configuration

If the amplifier supports an RMS power output close to the RMS input power of the subwoofers then run the amplifier in stereo mode. For example 150 watts RMS X 4 channels driven at 20-20khz. (If you can provide a model # for the subs and the amp your looking at I can help you further with this decision.

Wiring for this is easy and simply involves matching the connectors for 2 of the channels (Front or Rear) to each of the subwoofers.

#2 Mono Bridged mode.

If the amplifier is lower power but mono bridgable you can bridge two Pairs of channels and power each of the subwoofers this way.

Generally speaking a 2 channel bridgable amplifier will be able to at least combine the wattage of each channel into a single monural channel and in many cases its actually higher.

So you would bridge the front 2 channels into a single bridged mode for one subwoofer. and then you could bridge the read 2 channels into another bridged mono channel for your other sub woofer.

For example if you had bridgable amplifier thats 50 watts RMS X 4 you coudl very likely (Generalization based on quality of amplifier) send 150 watts RMS to each subwoofer.

Again I would need to know what amp you're refering to to provide specific wiring instructions. Many Bridging amplifiers either have a single switch that will send them to bridged mode or you would use the positive + terminal from one channel and the negative - terminal from the other channel or a combination of both.

Sep 17, 2008 | Kenwood 12" 4-Ohm Single-Voice-Coil...

1 Answer


It sounds like you've got too little impedance on it. How are the speakers wired? Are they in series (one speaker per channel) or are they in parallel (speaker 1 neg wire hooked up to channel 2, and speaker 2 neg wire hooked up to channel 1)? Or do you have a single speaker bridged (pos wire on one channel, neg wire on the other)? Often, an amp going into protection is a result of too much current draw, which happens when you're running a 2-ohm load on an amp that isn't rated to handle that (many are only OK at 4-ohms, which you'd have with series wiring). Let me know how you have the speakers wired and we'll go from there.

Aug 04, 2008 | MA Audio EHO152 15" 5000 Watts Subwoofer...

1 Answer


hi so you have to connect your minus point of your speaker to the positve channel 1 amplifier output, after you connect the positive channel 2 output amplifier to the first coil connection (no polarised) and the second coil connection to your positive point of your speaker, this solution if you can bridge your amplifier to one channel output.
if you can't bridge your amplifier, you have to connect your minus point of your speaker to the negative channel 1 amplifier output, after you connect the positive channel 1 output amplifier to the first coil connection (no polarised) and the second coil connection to your positive point of your speaker

I hope this helps
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Thank You

May 03, 2008 | Car Audio & Video

2 Answers


did you try to switch channels with the subs and see if it is the channel on the amp. if it works then its the sub and it will need replaced

Apr 01, 2008 | Jl Audio 12W3 Car Subwoofer

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