I was curious if the fact that I was using 8 meter "lesser quality" (due to high cost of "better quality" 8 meter) interconnects was causing some of the LF "hump" and apparent lesser HF response of the AOS's vs the EPI 1000's (that are in my family room right next to the preamp/source and thus use "better quality" 1 meter AudioQuest Black Mamba IC's). So I dragged one the AOS speakers into the family room and hooked it up there). The results were yes, at least part of the LF "hump" and ALL of the HF lesser response was due to the 8 meter IC's! (see enclosed bottom plot pink vs blue or yellow lines). I'm using the EPI 1000's response as a sort of "baseline".... The AOS's using the same system wires are a lot closer to this "baseline" then when they use the longer, lesser quality 8 meter IC's.
The effect of "more fill" on the AOS's response was nil.....see top plot (yellow vs dark blue line). Note that both AOS-I (and II..) and AOS-III have the LF "hump" and crappy extreme HF response...so this cannot be driver related since one uses 6.5" and 1" EPI and the other uses 8" and 1" PRO drivers. But when I use the better quality 1 meter Black Mamba's on AOS, these effects go away (mostly for the LF "hump" and totally for the extreme HF response).
This being the case, I will most likely spring for the 8 meter Black Mamba's as the "feed line" IC's to the AOS speakers in the living room system.... These plots seem to be very strong evidence that IC's DO make a difference...AFAIK, this is the 1st time I've seen this kind of actual "proof" posted on this forum!
add: Also, it could be coincidence, but the LF "hump" from when using the 8 meter IC's is almost exactly at 60 Hz.....since they go thru the wall between my FR and LR, they COULD be running close to an AC romex power cable and "picking up" some 60 Hz effect from THAT??
Living room: AudioQuest Black Mamba 8M IC's from family room preamp to Barcus-Berry 2002R Sonic Maximizer to GlowPower Zyxt IC's to Sunfire 300x2 to Nordost 6M bi-source wires to AOS 28" MDF spherical speakers using six 8" woofers and eight 1" dome tweeters symm. arranged around the surface.
SS system: CX-995V DVD to AV-705x 5 channel amp (center/rears) & M1.0t mk-II opt2(fronts).
Garage: TLM-3600 CDP to MXR150 Receiver (pre) to TFM-42 to EPI 400 speakers.