i spent a few hours last night using 666 on a sparse mix i've been redoing over and over. idea is i know the song so when i change plugs i get a good feel for what's different. the original mix is very wet and the guitar had the h-delay spring reverb on it to start with.
comparing h delay with the 666 i felt h delay wass better at long reverb times and the 666 was better at shorter reverb time. the h delay had more depth than the 666 and sounded a little bigger. what was also noticable is the gain staging of each plug. the 666 seems to attenuate the signal more than h-delay
i can see the 666 probably working better in dense mixes. on guitars and vocals and also on snare.
the winning move for me was when i had both reverbs working together. the 666 on one bus and the h-delay on another bus. that combo gave me a very realistic sounding space. the 2 complement each other very very well. i tried mixing the 666 into h-delay and vice versa but found the best sound was when they were both independent of each other. i also tried panning one left and one right and that sounded fantastic too but for the song i was using no panning suited better.