Thank you very much for the replies!
In fact I have researched a bit about 4CM and FRFR. 4CM seems too complicated when I just want to plug in and play without too much setting up on gigs. Same goes for 4CM with both amps and speakers. On the other hand, if I have understood correctly, FRFR means going directly to powered speakers. When I tried that, I sounded kind of 'muddy', probably because I have used presets designed for headphones. I guess I will have to have a copy of all presets and modify it for playing loud?
The main key is going to be, to set up your presets, do it at gig volume. One of the things I ran into is, playing in the context of a band is one thing when playing loud. But when I play that loud myself at home by myself out of context, eek, it scares me! haha
Regarding volume, I recently did a gig where I used my 2 L2 stage source speakers as the PA for vocals and my Helix. They had no problem keeping up with a guitarist with a Marshall and a double stack of 4x12's. Volume on the L2's was only a little over half. In another band, My Alto TS210 had no problem keeping up with another cranked Marshall punk band and drums in a garage.
??? Helix sounds great through the mixer. My unpleasant tones were occurring when I tried to run directly into a powered speaker via xlr.
I'm imagining you were going through a mic pre on the board, which likely softened/affected the tone a little. How were the EQ's on the channel set? What is the board? Did you try 1/4 into the powered speaker? What was the powered speaker?
So many variables, it's really hard to make any judgement on what is different for you. When you say it "lacked clarity", can you describe it better?