I have a Boss EQ20 on the way. Since my good experience with the behringer ub1202 mixer as preamp, I was thinking of getting the ub502 mixer which is lighter, but still has the same output of the more full featured 1202. With the Boss EQ20 for tone shaping and the 502 for enhanced gain output, I am hoping these two units paired up with my Focus SA would give me alot of nice tone (& flexibility) and still be quite inexpensive. I emailed behringer to see if the mixer would properly drive the Focus SA to its full volume capacity. This is their reply: The UB502 main outputs have a maximum level of +22 dBu and an impendance of approximately 120 ohms unbalanced. This is a standard professional line level signal, and is sufficient for the inputs of most power amplifiers. Maybe I am offbase here but +22 seems like low output to me. The sansamp sabddi was 0db and was good for driving the Focus SA. However, I am not too famaliar what all these measurements mean. Is +22 indeed, a much smaller output than 0db? Would +22db properly drive the full 600w in your opinion? Are there any cons of using the 502 (+ Boss EQ20) as preamp with my Focus SA? Since the Boss EQ20 is handling the tone shaping there shouldnt be any problems, correct?