To say this disc is bright surprises me. I have 3 of the Quadradisc to SACD from Audio Fidelity and I find all of them to have high frequency roll off. I compared the SACD stereo tracks with the quad tracks on Best of the Guess Who and the same songs from the SACD quad disc to the same DVDA songs from the Doors Perception set. I didn't compare the Best of Bread to anything it was boring and lifeless.
IMO the master tapes used for the Quadradisc and then quad SACD rolled off the highs because of the 18KHZ subcarrier used for the CD4 encoding process. Apparently CD4 offered four discrete channels but at a cost of high frequency response. I enjoyed CD4 back in the days when they were being released particularly Seals and Croft.
I enjoy both the Guess Who and Doors Best of SACDs but there is a price, high frequency response, paid to get them in quad and I prefer quad over stereo. Would be nice if they had open reel quad masters.