You are correct with regard to the signal path. And tone controls can affect things such as imaging, soundstage, etc as much other things (distortion, purity, etc).
I also want to suggest to you that there are other ways to affect the sound in your system, other than adding or removing components. In fact, some of the best ways include room treatments, speaker position, and listening position. Experiment with those things - a lot - and you may be surprised how much better your system can sound.
I also want to suggest to you that there are other ways to affect the sound in your system, other than adding or removing components. In fact, some of the best ways include room treatments, speaker position, and listening position. Experiment with those things - a lot - and you may be surprised how much better your system can sound.