My issue with this setup (Helios into 4 x 12 with V30's) is that it has an EXTREME harshness to it. So much that I literally cannot tolerate the sound coming directly from the speaker. It's too harsh and even thin sounding. This is at full power with all controls at noon except for presence, which was virtually off.
I'm not really a high gain player - I prefer the lower input plexi mode and I'm using an R9 Les Paul. I would expect the sound to be thick and woody but it's thin and harsh.
I'd be willing to change out two of the speaker to greenbacks but I can't imagine it would make that much of a difference.
Really, really frustrating.