Save for that, my greatest discovery in acoustic is, in the 2 cases, passive material treatment and active controls, the ratio between diffusion and absorption.... This is the KEY....Then to my 40 Helmholtz resonatorsgrid, ( my mechanical equalizer) i added 6 Helmholtz diffusers in the last 2 months...
This ratio of absorption/diffusion, with the rightful use of timing and reverberation time, is the more important cause of my actual very high S.Q. for the price paid....
The cause is NOT primarily my successful choices of electronical gear as good they were well chosen....It is the opposite experience which is all over the audio threads where miracles comes always or mostly from costly upgrades of electronical pieces...
Acoustic is the sleeping princess, all electronical pieces are only the 7 working dwarves....