It's not as severe, but for me the Chicago
Quadio suffers from the same mastering approach (as
@sjcorne says, one-size-fits-all) as the Doobies box. The bass (at times) is out of control, and the top end is glassy and strident in a way that I find really unpleasant.
I think I said this stuff on another thread, but I have a long history with Chicago - they were my first "favourite" band, and I ran the fist-ever fan website devoted to the band starting way back in 1994, and I've listened to the Terry Kath-era albums (especially the first 8) probably more than anything in my collection - I know these albums like the back of my hand. I've owned them all in their original LP incarnations, the quad LPs, and the original Columbia/Chicago Records CD issues, the Mastersound issue of
CTA, the SACDs of
CTA,
II &
VI, and the HDTracks 24/192 downloads of
CTA,
II (1970 mix, 2003 Kellogg mix, 2017 Wilson mix),
V,
VIII, and
X. All of these sound better (and more true to the smooth sound of the original LPs) than Anderson's
Quadio mastering, as does
@Bob Vosgien 's superb mastering of
CTA from the original standalone DTS DVD-V of the album from 10 years ago. The nonsense suggestion on the Quadio boxes that you need to turn your sub off to properly enjoy the albums speaks volumes to me about Anderson's inexperience with mastering - I own literally hundreds of digital versions of quad mixes from a variety of labels (including WMG ones that sound great, like Bruce Botnick's BD mastering of the Doors
Best Of) across a variety of formats and the
Quadio boxes are the only ones that have this problem.
I'm not the kind of person who needs to (or wants to) internet-bully people into taking my opinion as their opinion, and that's why I never waded in to the original Chicago
Quadio thread, or the poll thread with my opinion - everyone seemed to be enjoying it so much that it seemed like it wouldn't serve any positive purpose to wade in with an outlier opinion and say "you know that thing you love? Let me plant the seeds of doubt for why you shouldn't like it!" I could probably produce a load of A/B EQ graphic comparisons that show how the
Quadio boxes have boosted bass and treble relative to other versions, but it's literally academic - if you enjoy the
Quadio boxes, you enjoy them, the approach simply doesn't work for me, and no amount of overpriced cables, snake oil disc goop or pieces of vibrating wood in my listening space can mitigate something that is at its core, flawed.