i don't think we're at the bottom of the barrel yet, there's still arguably the best of the Seals & Crofts Quads to come ("Diamond Girl")
and then there's a couple more of their albums in Quad as well (not so great admittedly), the remaining 2 x Spinners Quads have even better mixes than the already released eponymous Quadio (the remaining 2 albums mixed by Don Murray who did the superb Philadelphia International Quad mixes of The O'Jays "Ship Ahoy" & Harold Melvin's "Black & Blue"), there's the (for me) better mixed of the 2 x Graham Central Station Quads still on the horizon (1975's "Ain't No Bout A Doubt It"), the Stardrive Featuring Robert Mason "Intergalactic Trot" album is real showcase Quad with a marvellous mix, there's more Gordon Lightfoot, Randy Newman and Carly Simon Quads and reissues of out of print and sought after Quads like Billy Cobham's "Spectrum" and potentially any other previously unreleased mixes before we even get into Maria Muldaur, Arlo Guthrie, Dionne Warwick and the Souther-Hillman-Furay Band territory, let alone Tony Orlando, New Seekers and all that jazz..!