Power Requirements.20 VA 160 mA A.C./120V A.C. Stereo Separation.60 dB 1 kHz (Crosstalk) Input Impedance.45k ohm(Direct input), 90k ohm(Normal inputs) Intermodulation Distortion.< 0.3%, 2V output Inputs.4įrequency Response.2 Hz to 100 kHz +/- 0.5dB The Sonic Frontiers SFL-1 is both musically satisfying & a joy to listen to. It has an ability to throw a huge sound stage and the dynamics are on par with solid state amplifiers. It may sacrifice certain details and brightness but it throws numerous other details into greater relief like vocal harmonies. The SFL-1 takes the bite off high tones and deepens the mid range to an astonishing degree. To design a low impedance power supply, Sonic Frontiers chose to use shunt regulation. The benefit of this approach is a 10 to 20 db decrease in noise levels. It has a realistic presentation of the original recording session that can extract the subtle sounds and sometimes the singer's imperfections. In the Line 3, there are both preregulation and regulation at the source using cascade regulation. Rock tracks are not congested on the high end and seem to tighten the bass without distortion. Jazz and sax sounds pure and reveals new nuances never heard before. Utilising a 12AT7 tube in its signal path, the Sonic Frontiers SFL-1 delivers most piano, horn, cello tones and vocals sound with warmth and a palpable mid range with clarity. Doug Schneider got excited and bought one and gave birth to an SFL-1 Signature with even more impressive parts quality and a higher price tag. Even after newer models were introduced, the SFL-1 stayed around, garnered more rave reviews. At its affordable introductory price, the SFL-1 became a benchmark for performance and quality in its price range. It was the Sonic Frontiers SFL-1 model that put its company on the map. The preamplifier is phenomenal when used through its direct input to bring out the best sonic qualities and will derive many years of listening pleasure. The 3 conspicuous knobs control the primary functions of the preamplifier - the input switch, sound balance and volume controllers.
It has a lovely retro design, yet built like a brick and runs silently in the background. The SFL-1 uses a thick machined stainless steel faceplate and a beautifully dressed smaller gold faceplate over it. The Sonic Frontiers SFL-1 is a classy tube hybrid preamplifier with gorgeous internal construction and immaculate wiring design by Joe Curcio.
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