Ok, here is the blast. I have a worst case dual rail +7.5v and -7.5v battery supply.
I need to add gain from a stereo line out of ~6db, or 2x, an input load of ~1k or 600ohm will do.
I want a clean audio output at ~7vp-p (+/-3.5v), ~2.5v-rms driving >250ma load without distortion.
Ok, I know how to use op-amps in analog circuits. I'm looking for a recommendation of the magic op-amp which will be crystal clear and not kill my batteries with too much background load. I also don't want any phase errors in the upper 10khz-20khz as well as any cross-over distortion whatsoever.