Usually you don't want a flat line on a headphone frequency response graph because the ear affects the sound from headphones differently from a flat pair of loudspeakers. Headroom graphs have a compensation curve built in so a flat line on that graph supposedly sounds good. However
1. It's for the dummy head model, your ears may be different
2. The frequency graph has been smoothed over
There are two threads on by-ear equalizing
The first thread is well organized but the thread starter is gone and there are some inaccuracies in the information presented. I started the second thread but never had the energy to finish the writeup so...
Basically I wanted to add two contributions to the first thread
1. When equalizing by ear one should not aim to make all frequencies sound the same loudness, because one needs to compensate for the equal loudness curve of human hearing
2. One can compensate for this by adding a second equalizer in line to the first, reproducing the equal loudness contour; then one can just aim for the same loudness in all frequencies with the first equalizer and you should have a flat headphone response when you remove the second EQ.
I then try to go into details on how this is done and failed miserably at properly describing it But you can pm me if you're interested and I can try to walk you through it
Finally, you want to add a "gain only" EQ band to your Electri-Q preset and lower the whole curve below zero to prevent clipping.
Thanks, I was actually looking through those threads a couple hours ago and was going to try those techniques tonight. I wish I could run sine-gen through electri-q somehow though, that would make things easier it seems.
But is a gain only band neccessary? I thought pre-amp does the same thing, I just set that at whatever the inverse of the highest gain on my EQ is.
Edited by chewy4 - 12/5/12 at 10:56am