Thanks for the responses~
I've got two other Mackies...a 1402VLZ Pro 8ch & a Onyx 1620 8 ch, which I've been making comparisons with.
In doing side by side comparisons it does seems that the 58 just needs alot of gain (all faders to 0)
I'm also recording into audacity....my levels on each board are coming out with the same size wave forms, but the 1402 & Onyz sound a little clearer.
But here, in Audacity, the waveforms are about .1 / -.1 high, but gonna save this problem for another day~