I've searched high and low, this forum, that forum and all in between and have YET to find an actual definitive answer, so let's see if we can just get the correct answer out there and be done with it.
My $400+ dollar Headunit (New in 2011) has a black RCA line out that says "Subwoofer" on it. Obviously, RCA's come in pairs. My amps input has 2 RCA's. This is the "dilemma" or the question:
What is the 100% "book" way to make this connection? Do you put a Y splitter RCA into the headunit subwoofer out and run it as normal, or do you just connect ONE of the RCA's to both the headunit and the amp because the amp "knows it's mono anyway and only needs one"<~(That's not what I am saying, it's what I've read)
The general consensus basically leaves 2 answers that make sense, but nothing definitive, and 1 answer that's just asinine.
1. Plug 1 RCA into the headunit and 1 into the amp. The amp handles the signal internally, and there is no need for a splitter or any other alterations.
2. Use a Y-splitter. The problem with this is you will split the signal and only get half the voltage which you can make up with the gain setting.
3. Buy a better headunit loser. One that has 2 outputs.
All 3 of these are what I have come across on multiple forums. The 3rd one is retarded, because my headunit was $400 and does not need to be upgraded to accomplish this connection.
Maybe someone's search/googleFU is better than mine, and I apologize in advance if this has been discussed in depth as I have not been able to find it.