OWNER’ S MANUAL THE SONIC FRONTI ERS SFL-2 PREAMPL IFIER AND POWER SUPPLY
A B K C D L E F G H I J M OPERATION, CONNECTIONS AND CONTROL FUNCTIONS A- Power Input Socket - Plug the Preamplifier Power Cord (M) from the Power Supply into this socket. Simply align the plug and socket so the plug inserts easily and freely when pushing the connection together. Screw on locking ring allowing it to “click” to secure the connection (see Figure 1).
N O P U N- Selector Switch - This knob is turned to select an input (E) through (J). O- Record/Off Switch - This toggle switch turns the outputs off and prevents the main preamp outputs from being loaded down by the non-linear load of most tape decks when the record functions are not in use. To record, move the switch to the record position and wait a short delay (5 seconds) for the protective muting function to clear and connect the tape outputs.
A M WARNING Figure 1 - Align pins in receptacle (A) to pin holes in connector (M), align notches to ridges and push together. Turn locking ring clockwise until it “clicks” indicating it is locked. DO NOT ADJUST the controls represented in the shaded box shown in Figure 3 below. These controls have been factory set for the optimum performance (both sonically and electrically) of the SFL-2 Preamplifier. Do not adjust these controls - doing so will degrade the performance of the SFL-2.
INSERTION OF THE TUBES REPLACEMENT OF THE TUBES The SFL-2 comes with eight 6922 (6DJ8-type) tubes, individually boxed and bagged along with a cotton glove, allen key, PearlTM Tube Coolers and screws for fastening the SFL-2 cover. Sonic Frontiers strongly discourages non-factory replacement of the tubes. The eight 6922 (6DJ8-type) tubes are measured, selected, and matched in balanced pairs - channel to channel and triode section to triode section - for optimum performance.
SAFETY INSTRUCTIONS LIMITED FIVE YEAR WARRANTY 1. Ventilation - Although your SFL-2 Preamplifier generates only nominal heat in use, be sure that the ventilation slots in the top cover have at least 6” of unobstructed air space above them. Sonic Frontiers, Inc. warrants to the purchaser that each SFL-2 Preamplifier and Power Supply is free of manufacturing defects for a period of five (5) years from the date of purchase.
TECHNICAL SPECIFICATIONS Frequency Response 2 Hz to 100 kHz ±0.5 dB (100K load) > 350 kHz -3.0 dB THD & N (@ 1 V output) < 0.1% from 20 Hz to 20 kHz typically < 0.03% @ 1 kHz Gain 22 dB @ 1 kHz (single-ended) 28 dB @ 1 kHz (balanced) Noise 120 uV unweighted (balanced outputs, volume control @ 12 o’clock) -85 dB below @ 2 Volt R.M.S. output SMPTE (IMD) @ 2 V output < 0.05%, typically 0.
We at Sonic Frontiers are sure that you will derive many years of listening pleasure with your new SFL-2 Preamplifier and Power Supply. This Owner’s Manual contains important information regarding the operation and care of the SFL-2. Be sure to read this manual carefully and follow these instructions in order to keep it looking, operating and sounding its best.
