Some form of equalisation is applied in most audio systems. Ideally this should correct the system and transducer response only. Attempting to EQ a room will ma

Some form of equalisation is applied in most audio systems. Ideally this should correct the system and transducer response only. Attempting to EQ a room will make things worse as the response will differ across listening positions. For addressing room resonance, physical acoustic treatment (bass traps, diffractive and absorptive materials), or in the case of new construction optimising the structure of the room itself is the general approach, with DSP used to augment this. There's an interesting intersection of this once you start diving into the world of active acoustics too. In the venue space you have systems like Meyer Constellation or L-ISA that use a distributed set of speakers and microphones to be able to change the room acoustics in real-time, or even emulate a different space.