Right now what would be a perfect fit is the Alpine ERA-320. This unit has all the features I want. Although I don't want to spend $400 on such an old unit. My price point is going to be around $200-300 hopefully.
The features I am looking for are:
Realtime Graphic Frequency Display
5+ bands independent for 6 channels (Front, Rear, Sub Out)
BBE (I'm old school)
Time / Offset Adjustment
Some type of Phase adjustment for at least 2 channels
Central / Unified Realtime control
I know there are bluetooth / usb / windows programmed units that have time and phase adjustments per channel and frequency but those are too fancy - and expensive.
I will only be dealing with Stereo sources, so I don't need a 5.1 gizmo. I am willing to spare a double-din slot but no more than that. I will be using a custom build Android head unit, for now just using my phone. I am waiting for the screen to be back in stock and once they are, I will have everything I need to complete it.
The android hardware does have usb and bt, but bt is not working with the software build I will be using. If I had an ODB2 vehicle, this would be a different story
Right now I really don't know what is out there, and what I do find is lacking major features or is way too expensive. I don't mind an older product that is easy to find. I also don't mind a little noise on the floor cause when you turn it up, you can't tell anymore
I am open to any suggestions and can answer any questions needed to find the the right product for me. Thanks!