I’ll admit that I do rely on DSP for this but am currently renting while between houses. I’d still use DSP but would start with physical room treatment if practical. In case you’re interested I use one of the MiniDSP boxes with Dirac live built in. It has the advantage that you can apply it to 3 digital sources Roon streamer, the TV and a Bluetooth box in my case. I’m happy with it but I still use Roon’s DSP for headphone equalisation where IMHO it makes a big difference.