@purrin: Could you slap a 10-band-Eq with -4 dB at 8 kHz on that T1 and measure it again? I'm curious what the effect on the FR and resonances is. Hum... then again, I tested 2 equalizers in maybe not equal circumstances, but they sounded different with the same setting... mh. maybe I'm doing it wrong.
My measurement rig won't support a digital EQ. The two equalizers could have differing curve widths. This makes a huge difference. Try a parametric EQ where you can pick a frequency and curve Q.