Yes, no secret the DQ-10 copied the exterior design of the Quad 57.
Early versions of the DQ-10 were produced with the same driver array for both channels, a common practice at the time. A local dealer, Audio Directions, developed a few mods, including the mirror image array, later adopted by the factory. I never knew if Jon Dahlquist was influenced by the store's demo or not? Also it was popular to replace that Motorola tweeter. And someone developed a wood box base that could be opened to the woofer to create a larger back cavity to extend the bass.
I remember being impressed by the demo at that store, but they were just out of my reach so I settled for early Vandersteen 2s.