You can use either set of RCA outputs for the amplifier that you want to. Only difference in either of them is front, rear and sub outputs. If you are only powering a sub amp, then use the sub outputs, otherwise, the other two will work fine. You can still use the outputs from the radio itself to power four other speakers while using the RCA outputs.
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There may be many different power supplies that will work for your speaker system, but they must comply with the following:
1. The output voltage of the power supply should be correct as what the speaker system requires. (seems like 12 V in your case)
2. The specified maximum current output of the power supply should always be a higher value than the Amperage spec of the speaker system.
3. The output wires or pins of the plug on the power supply should correspond to the (+) and (-) on the power input of the speaker system.
A multimeter will come in handy to determine a power supply's output voltage and polarity.
I'm assuming that you are using a standard amplifier with L and R speaker outputs if a stereo Amp.... or L and R and SUB standard RCA output jacks. If it is a more complicated setup, having surround sound speaker jacks, then look for a SUB OUT jack or plug.
Some Subwoofers are self-powered, having their own, built in amplifier especially designed for that model. Sometimes they require a SUB connection and a power supply to the 110V AC house power too. These sometimes need a connection to a standard 3.5 mm HEADPHONE jack output plug. If it's this type, then the front of your amplifier could have one. Either way, the musical signal from amplifier to the subwoofer must be available on your Amp AND be received by the type of subwoofer you are using.
Speaker output from the amplifier is a higher voltage than a preout. The speaker level signal has to be reduced to a line level signal in order to connect to another amplifier. I used a car stereo "speaker to line level adapter" and then connected a second amp to run my front channel speakers. Works just fine.
Your amp is a four channel so you have 4 sets of speaker outputs. to bridge this amp to 2 channels is pretty simple, all your have to do is when connecting your speakers instead of using both +, and - from the same channel, use the + from the one channel, and the - from the adjacent channel. Do this for both speakers, if you'll notice you now have 2 empty - terminals and 2 empty + terminals, if so you did it right... Hope this helps, enjoy your amp.
The proper way to do this would be to use the audio output from the TV, either analogue left and right or the optical port, and send it into an dedicated amplifier or AV receiver. You can then use the amplifier or receiver to power the external speakers. If you are using a dedicated amplifier with no volume control you will want to change the audio output setting on the TV to "variable out" as oppose to its current "fixed out"settings. You can find this in the TV menu, usually under the audio settings. This will allow you to use the current TV remote to adjust the audio volume coming out of the external speakers.
You will need a line level adaptor to get an audio input for the amp.
A line level adaptor is a device that lets you tap off of your speaker outputs of the radio and it converts that signal into the proper level for an RCA input signal the amplifier uses.
If you are installing the amp in the trunk of the car you can just tap off the speaker outputs of the rear speakers mounted in the trunk. Keep the speaker outputs connected to the speakers, just run an extra set of wires from them to the line level adaptor. It will not take anything away from the speakers sound because it is not a power drain on them.
After that, you just connect the power wires for the amp as you would normally and you also need to run an extra wire from the radio power antenna wire to the remote turn on of the amp, or you can use a wire directly from the battery and connect it thru a switch you would need to connect somewhere around the dash, so you can turn the amp on and off when you need to. The power antenna wire from the radio is best, so you don't need to turn the amp on and off manually. It is easy to forget about turning it off sometimes and that would run doen your battery if the amp is left on over night even with no signal going thru it.
Then connect your speakers to the amp and thats it.
Then big issue is getting an audio signal to the amp and the turn on signal for the amp.
If your 2100ES has a selectable INPUT AND OUTPUT and if you're intending to send all signal to the power amp, i.e. not bi-wiring or using the 2100ES to run mid-range or treble then you simply send Left & Right audio (White & Red cable) from a 2100ES output, probably AUX OUT ( it doesn't really matter apart from Phono on some units) straight to the power amp on AUX IN.
We should be just dealing with audio here, so connect the NAD audio output to CD or DVD IN. Select CD or DVD IN on 2100ES input switch and switch output to AUX OUT (whatever you decided goes to the power amp) on the 2100ES. Turn power amp to AUX IN and it will now get an audio signal from the 2100ES for amplification.
Speakers connect to the power amp as a normal amp, so pos and neg etc. The 2100ES now only acts as a signal feed, the power amp does all the work.
So, summary - switch on the NAD, press play - video goes separately and audio goes to the 2100ES. Turn 2100ES to INPUT for NAD. Turn 2100ES to OUTPUT allocated for power amp. Turn INPUT on power amp to allocation for 2100ES.