Sonic Frontiers was founded by Chris Jensen and Chris Johnson and ultimately sold to Paradigm as a matching electronics line to go with their well-respected speakers.
Paradigm doesn't make Sonic Frontiers tube electronics any longer, however they took Sonic Frontier's sister line, Anthem, and made it one of the best up-market success stories in home theater today.
Anthem's AV preamps and amps are value leaders in their space and compete favorably with the big-boy receivers as well as AV preamps costing triple (or more) the price.
Notable Sonic Fronties products included:
Sonic Frontiers SFT-1 transport
Sonic Frontiers Power 3 monoblock
Sonic Frontiers Line 1 preamp
Read Ken Kessler's review of the Sonic Frontiers SFS-50 Tube Power Amp on HomeTheaterReview.com.