First are you still using the factory radio? If this is the case, there is nothing wrong with using the high level input to the amp. You can buy a high to low level convert and buy an rca jack, but it won't make that big of a difference. Either way the amp effectively has a high to low built in (speaker level input) If you have an aftermarket radio, use one of the rca outputs and run that to the rca input of the amp. Where it gets a little confusing is; what 4 speakers are you going to run to the amp? If you are thinking to run your rear speakers and your subs off the 2 channel amp, I would not do this. You would have to run the amp full range range and this would make everything sound bad. Your full range are going to try and play bass, and your subs are going to try and play highs, this is not a good idea. Also you would not run it in series because this would create an 8ohm stereo load and you would get 25 watts a channel period. 12.5 watts per speaker. With a 2 channel amp you need to just run the subs and keep your speakers running off the radio. You can still tap into the rear speaker wires if you want to run speaker level input. The other option is to buy a 4 channel amp and run 2 channels to the subs and 2 channels to your full range speakers. This would be a far better option. You need to verify the ohm load of the subs and make sure they match the amp specs either way.
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