ive never used a rack set up and no nothing about levels and such other than i need to turn an instrument level into a line level. im acquiring a stereo power amp and do not have a preamp. i would like to run straight to a presonus bluemax smart compressor (to boost level) into a samson f800 amp. the comps output impedance is 51 ohms. the unit also has a -10dB / +4dB function. the amps input sensitivity is +0dbm +/- 1dbm ive read this: http://www.ovnilab.com/articles/preamp.shtml#power which talks about dbu, not dbm. this article as well as the rest of the site is very informative, but i can not determine if this will be a decent set up as i can not find any other information on the two pieces of equipment in question. thanks.