Originally Posted by muffinmcfluffin
Does anyone have a house curve answer I was referring to earlier? Across from 15Hz-20kHz, do you really want the whole thing to be flat? Or do you want it to slope off as you go higher? I have a feeling it's going to sound too bright if it doesn't slope off.
And how do you determine what this slope is?
Check the straightish green trace on slide 23 and the straightish red trace on slide 24. That is the coveted 'Harman target' that users of Dirac get an approximation of as their default (so I have read).
Figure 5 is an older curve from an earlier time.
Notice that while Harman's curve attenuates 20KHz by ~12dB, B&K attenuates 20KHz by ~6dB. Probably best to pick something in the middle IMO given that my system with an approximation of Harman's curve in manual EQ sounds slightly muffled (or is that my hearing?).
My opinion on how to determine the slope is to set up your room treatments first to get broadband decay of somewhere between 300ms and 500ms (depending on multichannel or stereo system) and then measure all your speakers with no EQ and average their responses in REW. The speakers will tell you what your target should look like.
This approach of mine is controversial, but what I found is that in a treated room the natural rolloff of my speakers already approaches the Harman target so I am assuming that means they did something similar when developing their target.
The principle I go by is that designers make speakers have flat on-axis anechoic response and humans can perceive the general character of that flat on-axis anechoic response even after the speaker is placed in a room, but the room EQ cannot.
So what to do is to let the no-EQ microphone measurement pick up the general trend of the in-room response and then straighten the measured response with EQ until it is a straightish line, or maybe roll off the bass a little as B&K did since speakers tend to naturally do that anyway in a room past their bass extension limit and humans probably expect to hear that rolloff in a room.