I'm looking to pull the Bose system out of my car and install something significantly higher-end, but I'm having trouble figuring out if the Bose head unit outputs a full-range flat signal to the amplifier which then does EQ work, or if the head unit itself does some EQ work. Obviously because of how tightly integrated the head unit and control system is I'd like to keep those stock.
Does anyone know or has anyone found a reference where somebody's done some actual RTA work to find out what the output is like? You can see what I mean in this video from Mark at CarAudioFabrication. In that example, the bass frequencies have a bit of a high-pass filter applied so you're not getting the full-fat electrical signal sent to the amplifier.
Cheers