I am using the Sonic Frontiers SFL-2 preamp and the Sonic Frontiers Power 2 amp to this day. Both have been upgraded by Parts Connection with wonderful results. I had the preamp upgraded again with Mundorf Silver Gold Oil film caps and Duelund silver foil bypass caps. All other old caps have been changed so both are ready for many more years of service. I can enthusiastically recommend both, just be sure the caps in the amp are replaced.
