• Overview – The Sonic Frontiers Line 3 Tube Preamplifier, launched in 1999, is a fully balanced, high-end tube preamp using premium 6DJ8/6922 valves, delivering exceptional transparency, harmonic richness, and reference-grade control for demanding audiophile systems.

• Tube Architecture – Featuring a sophisticated multi-tube gain stage, precision regulation, and dual-mono audio paths, the Sonic Frontiers Line 3 provides outstanding dimensionality, low noise, and authoritative dynamic contrast suited for high-resolution sources.

• Power & Control – The preamplifier employs an outboard power supply with extensive regulation, ensuring stable current delivery, reduced noise floor, and improved responsiveness across complex musical passages in the Line 3 system.

• Connectivity – Offering fully balanced XLR and high-quality RCA inputs/outputs, remote control, and modular internal boards, the Sonic Frontiers Line 3 integrates seamlessly into reference-level stereo setups requiring flexibility and sonic refinement.

• Dimensions – Main chassis approx. 483 mm (W) × 152 mm (H) × 432 mm (D); external power supply approx. 483 mm (W) × 102 mm (H) × 330 mm (D), both built for robust rack integration.

• Weight – Main unit weighs about 18–20 kg, while the power supply adds approximately 15 kg, reflecting its heavy-duty transformers and substantial regulation stages.