This is my current build:
- Speedy Bee F7 V3 stack
- T-Motor VELOX VELOCE V2207.5 V2, 2550KV motors
- FrSky Archer RS receiver
- DAL T5047C propellers
- Kavan 4S battery
With this frame you should use a stack or all in one. Four single motor ESCs would be impractical. When searching for a controller you may want to check if it is supported by inav or ardupilot to keep your options open. All boards are supported by betaflight, but it’s not very beginner friendly.
It helped me to turn up the volume on center speaker directly on the speakers. Using the speakers infrared remote control. It goes -4 to 4 for all speakers and on +4 i can usually understand what are the actors saying.