cleeds, thanks for digging out that review. Anyone with interest in the 901s should find it worthwhile reading.
And while it may be more complementary than my memory recalled, Holt did express several reservations. But first I would note that review was from 1971. Perspectives on speaker spacious sound have certainly evolved since then. Particularly with influence by HP in TAS for specific soundstaging.
Regarding Holt's opinions, here are a few quotes:
"But we were less impressed by some other qualities of the 901"
"Thus, some 901 installations will have deep, tight, and quite well-defined bass, while others (in the majority) will exhibit uncontrolled bass resonances"
"It is our feeling, though, that Dr. Bose is either oversimplifying his explanation of what the 901 does or has drawn some dubious conclusions from his basic premise"
"This tremendous gain in spatial effect is not, however, achieved without some sacrifices. . . . to create such monstrosities as 2'-wide singers and 8' guitars."
"What is, we feel, a more serious shortcoming of the 901 principle is that it subjects the direct sounds in a recording to the same reflective process that enhances the recorded spatial material."
" . . . but we would characterize it as unexceptional in all other respects."
And that is why I remembered the review overall as not rating the 901s highly.