Gentlemen ALL!
I started this thread in search of the truth. Now with over a hundred investigations reported.
I decide to get to the bottom once and for ALL.
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??
p.s. Don has ordered (6).