@stevecham---You don’t understand. You ask MG to explain what he does, but he’s not gonna give that away---that’s his product! He is no longer a hi-fi retailer selling currently available commercial products (except his own), he sells his "tuning" service. He comes on Forums saying "Let’s have some fun!", but this is his business. He’s not posting here to "have some fun", he’s here to create interest in his services, his business.
MG’s original commercial products in the 1990’s were the Room Tunes. Have you ever seen one, or even better looked inside or taken one apart? It’s a sheet of fiberglass insulation covered in grill cloth. Big Deal! A real acoustical engineer, Art Noxon of Acoustic Science Corporation, produces real, sophisticated acoustical products. They are found in recording studios and high performance hi-fi rooms all over the world. I’ve never seen a Room Tune in any studio I’ve been in, nor any high performance home music system. Everyone gave their Room Tunes away years ago; there are far better products available.
I’m all for optimizing the sound of one’s system and room with tweaks. But "tuning" your CD player, receiver (really? A receiver?!), or speakers, and changing the "tuning" for different recordings? That’s a sure way to madness!