Low pass the highs or Low shelf the lows?

[abdo123]

I'm in a position where my response declines sharply right when the room get dominant (~500 Hz). Going off the FR curve, I need an LS filter with 5 dB to get closer to the Harman in-room target curve.

However the moment i boost the base, the modes get further excited, the dips remain dippy and the sound is farther away from neutrality than we began.

At the same time, I never heard of anyone EQing past 2 KHz. It's risky considering at these frequencies even a little bit of movement can significantly change the response.

I'm thinking of using the crossover tone knobs at the back of the speaker and see what they do; However, it's a vintage speaker and these knobs never sounded good when they were engaged.

 

[thewas]

Is your loudspeaker anechoically relatively flat below 500 Hz? If yes I wouldn't recommend trying to bump it up to some predefined curve from another loudspeaker and room, a mistake I also did for a long time with very similar audible results like you write above. There are rooms and locations that absorb a lot of bass and bumping up the bass just make the sound muddy, I end up using anechoically flat loudspeakers (or EQing them to be so) and then only correcting a couple of excessive modal bumps up to approximately 200 Hz.