i've been waiting for my local dealer to get a shuttle 6.0 in to try out. he did have an older neopak and i asked him if i could gig it last night to get an idea of the sound. (i believe the preamp is the same) well the verdict? i really loved the sound. it sounds kinda like an eden but better for my needs. it was a semi-loud outside gig with my three piece band. we play a variety of "bar music" rock, funk, country, whatever... the only thing is i was pushing the amp just about to it's limits. this is only a moderately loud gig and i always have pa support, but it's not the loudest gig i play. the clip light was blinking when i dug in or slapped hard. (not the preamp clip) to put things in perspective i usually play through a gk rb800 and it is quite loud enough for my needs. (volume-wise it walks off and leaves the neopak) i loved the sound of this head but i need more headroom. anybody ever compared the shuttle 6.0 volume-wise with an 800rb? also is the sound of the older genz 600 quite similar to the neopak, as i might go with a more traditional power supply. all in all, the neopak is a great sounding head. absolutely fantastic, it just doesn't quite have the headroom that i need.