Help installing a line output converter for RCA outputs

Thank you for the reply. I did end up buying the Audio Control LC2I Pro with AccuBASS. I still have not installed my system yet though. There are still a few things I want to make sure of before I do. I have the ELS factory system. I plan on tapping into the subwoofer wires for the inputs to the LC2I controller at the subwoofer but not sure if this is the best place for tapping into since this signal is coming from after the factory amplifier. My second concern is I use Bluetooth for playing music. To start I have to have my phone screen off before starting the car and often notice that I don't get full audio sound/ power from my factory speakers when first starting the car, after driving for a little while, then the sound all of a sudden becomes fuller and more powerful. The sound is good after that, but if I open my phone to do any other actions the music immediately loses the full sound and power. Even if I close my phone afterwards the music will never become fuller again until I shut off the car, have my phone screen off and start the car again. This is very annoying and I want to resolve this issue first. I have the SVC speed volume control set to off, so I don't know if this componet could somehow be the underlying cause of the issue or not. All I know is I don't want to have this issue period and secondly don't want to all of a sudden have full in rush of bass each time. Thank you again for your response though. There has been no help at all in this forum until your reply. I have done numerous searches on the acura rlx audio system but there is nothing really out there at all in any threads. I can't even find wiring schematics which sucks as well.