It is there as a "pass through". This comes in handy if your deck only has one set of RCA outputs. It enables you to "daisy chain" multiple amps together. You would run the RCA cables from the deck to amp #1's input, then use a another cable from the output on amp #1 to the input on amp #2.
I have, I have even used the output for the input of the same amp, so that you only run one RCA cable to the amp, then run the output back to the other input, and it runs 4 channels.. :o)
if the head unit can produce sound to your speakers without the amp you have high level output from head unit if your amp only accepts low level input (rca) plugs you must buy a high to low level converter which take speaker high output and reduces it to low ( rca) output and then go to your amp converter is under 20 bucks but most new amp accept hi and low level feed
It's so you can use your stereo speaker output wires to the amp without having to use RCA cables It should say High Level Input and you use it or RCA cables. Not both. If you plan on using the amp to power subs use RCAs. If you plan on running mids and highs you can use what you like. If your stereo has front and/or rear RCA outputs as well as sub output it's your call
The RCA's from the amp will be arn to the CD player, then you need to connect the speaker's wire to the output + and - of the amp, this will cause the amp to have musical power from your radio, and the speakers to have the power from the amp..-Shocker
Normal car radio is no different than aftermarket. Determine the output wires on the radio, take them into the amp and the output from the amp back to the wires going to the speakers. Normal car speakers are not going to take the output of the amp if you raise it much.
due to fact there are no rca outputs you must purchase a line level converter, which has RCA type jacks.
RCA or Alpine hd
you would just install them like you would on a normal car, but I'm assuming you are using the stock head unit which doesn't have RCA outputs, so you will need to buy a line output converter to run the RCA cables from the head unit to the subs
I believe you can if you can find a cord that would have RCA jacks on the end to plug into your amp
You have to run the powers and grounds for the amp, do not forget to set up the remote wire either. then you will need to connect the amp to the CD player auxillary with the RCA's, then you just wire your sub to the amp.-Shocker
You will need what is called an L.O.C., which is a line output converter. It is used to convert speaker lines into an RCA output. Some LOCs are available for OEM intergration, which are very expensive, and then some are available for OEM intergration, but aren't to OEM specs, as they are universal LOCs, such as the Scosche SLC4, which is available for $20 from Crutchfield.com
Around 330 watts. For a car battery.