Cool, I really like that setup! I got that for my Blackverb. I like the H magnet Greenback and also the H magnet Creamback. I like large dust cap speakers (G12-65, CL-80, WGS ET65). I usually play with high gain, decided to give it a whirl. I really have no idea what the exact sonic difference would be vs the regular H75, likely not all that much. When I shipped my Blackverb to Red Plate I actually forgot I swapped out the speaker, or rather just wasnt thinking about it. It came with a G12-65. When the Blackverb got back to Red Plate Keith was like you wanna use that H75-LD I bet it would sound really good. So there it is.