![]() ![]() Jim Croft told me that, during the development of the Lightstar, they also built a fully balanced version, and then worked on improving the unbalanced version until it sounded very close to the balanced protype. However, its impedance, while extremely even, is in the 5 ohm range, so it is somewhat demanding of current. Robert Deutschįootnote 1: Although the Lightstar has balanced inputs, it's not a fully balanced (differential) design. The SC-IV has above-average sensitivity (91dB/W/m) and does not present a reactive load. Speakers were Dunlavy Audio Labs SC-IVsfirst the original pair that formed the basis of my review in April 1994 (Vol.17 No.4), then the revised version discussed in my Follow-Up to that review in March '95 (Vol.18 No.3). If you want to reopen this topic, contact a moderator using the 'Report Post' button. Views: 99 Sonic Frontiers SFL-2 Preamp+ ext.PS Instruction Manual.pdf 574.6 KB.The sonic differences (once I compensated for the higher gain in the balanced mode) were fairly minor, the unbalanced mode sounding a touch more open (footnote 1). Sonic Frontiers SFL-1 Preamplifier Instruction Manual.pdf 442.6 KB In connecting the SFL-2 to the Lightstar, I tried both balanced and unbalanced connections. Preamp Output: 2.5V (30V max) Frequency Response: 2Hz to 100kHz. On the other AC line, the digital components were plugged into a Tice Series II Power Block line-conditioner, the preamp directly into AC. Sonic Frontiers SFL-2 specification & technical data. My listening room has two dedicated AC lines the Lightstar was plugged directly into two receptacles (remember: it has two power cables) fed by one of the lines. I have The Original Cable Jackets, grounded to a single wire, on all the power cables. The Linn has a MM phono section and not a perfect match for my 2.5 mv MC cart. I am currently using a Linn Kolecktor but wanting to go the tube route with a preamp. The Lightstar manual warns against using power cables other than those supplied, which are specially shielded and able to handle high current, but I obtained better results with TARA Labs RSC. Sonic Frontiers Line 2, Heaven or Hell Looking for recommendations here concerning a pre amp swap. Interconnects, digital links (AES/EBU), and power cables were mostly the latest-generation TARA Labs RSC. Reference power amplifiers were the Bryston 7B monoblocks, Krell KSA-100S, and Threshold T-200. The preamp used was mostly a Sonic Frontiers SFL-2, with some use also made of a Convergent Audio Technology SL-1 Signature. Digital sources were PS Audio's Lambda transport, Sonic Frontiers' UltraJitterbug, PS Audio's UltraLink II, and Sonic Frontiers' SFD-2. Analog sources were the Linn Sondek LP12 with all the accoutrements (Lingo, Cirkus, QR/DNM Design 330 Mk.II Ringmat), Linn Ittok, and AudioQuest AQ7000nsx. ![]()
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