Equalizing at high frequencies can be difficult if you are having narrow-band problems in your room, such as "comb-filter" effects, flutter echoes, or any other acoustic-reflection problems. If your YPAO is having difficulty with your room, it is unlikely any other equalization system will be much better.
You can find these issues using the REW, and using your ears too. Do a full-band sweep with the REW and look at how smooth the sweep is in the midrange frequencies. Are you seeing narrow-band dips in the response that look like the teeth of a comb? These are called comb-filtering, and they are caused by early reflections that give destructive cancellation at the microphone. You can experience them for yourself by using a single tone at 2-4 kHz, and sitting in your listening locations. Rock your head back and forth. Do you hear the apparent sound source changing postion in the room? Do you hear the sound sliding in one ear and out the other? That's comb filtering, and it's caused by reflections. You have to fix those reflections using acoustic treatments. Equalization will not help.
You can find these issues using the REW, and using your ears too. Do a full-band sweep with the REW and look at how smooth the sweep is in the midrange frequencies. Are you seeing narrow-band dips in the response that look like the teeth of a comb? These are called comb-filtering, and they are caused by early reflections that give destructive cancellation at the microphone. You can experience them for yourself by using a single tone at 2-4 kHz, and sitting in your listening locations. Rock your head back and forth. Do you hear the apparent sound source changing postion in the room? Do you hear the sound sliding in one ear and out the other? That's comb filtering, and it's caused by reflections. You have to fix those reflections using acoustic treatments. Equalization will not help.
