Originally posted by J Irwan
Dennis,

I think the one you have is different adapter all together.

The one you have will allow you to add additional Ampilifer.. via RCA connector. (this is assuming you want to use your stock Headunit which doesn't have RCA ouput).
Hmmm. Well, this item has both RCA and an 8 line something (four speakers perhaps). It's weird, cuz the output end has both options. I can swap one for the other. It also has four dials I can use to tweak something (I was guessing that it is similar to what I have read in the numerous posts). Maybe I'll try without it first. Btw, I got a Nakamichi HU (a MB-VI).

edit: I just read from another website that the SVEN4 can be use as a line converter: Description 2