One our Audio circle guy's." NO $100 TWEETS could improve his system." Which comprises of Vac Pre-amp & Amps diving Magico Q5's speakers. I took (3) IQSE over to his home.Placed (1) under pre-amp (1) each @ amp mono block 450 amp.
His has multi band sound generator/with a Calibrated mike. He works for Intel and has a lot Top line test gear
TEST#1 Mike 1 meter from speaker and no IQSE's (PINK NOISE)
70db the monitor display With memory locks @ amplitudes
0 to 50 on the screen. @ 70db the signal peaked@35 with some overshoots. NOW the acid test.
TEST#2 With IQSE's No change with test instruments
PINK NOISE peaked@ 33.with absolutely no over shoots.
What seems to me the ISQE's removes or clean-up information or un-wanted garbage in it, which in turn our ears notice.
Maybe not garbage??
This is my problem with Bybee products. They throw out the baby with the bath water. Its definitely not all garbage, along with the distortion.
It's akin to high res microphones that throw out musical information to have lower distortion. The microphones usually sound sterile. That's a worst case scenario.
If you, your friend, and all of the Bybee lovers are happy with the final sound, that is all that matters. Then the measurements, or worry about what it's made from, shouldn't matter.