Backert Labs Rhumba 1.0 Linestage – Specifications Tube Complement: 2 × 12AU7 (gain stage) Gain: Approximately 9 dB Frequency Response: 6 Hz to 108 kHz ±1.5 dB (alternate reports cite 3 Hz to 320 kHz ±3 dB) THD + N: Approximately 0.09% Signal-to-Noise Ratio: Approximately 98 dB Input Impedance: 34–56 kΩ Output Impedance: Less than 80 Ω Channel Separation: Approximately 78 dB Power Consumption: Approximately 31 W at idle Dimensions: 17″ (W) × 15″ (D) × 5″ (H) Weight: 22–24 lb Inputs / Outputs:     • 1 × balanced XLR input     • 3–4 × RCA line-level inputs     • 1 × balanced XLR output     • 2 × RCA outputs     • Tape/record out and home-theater bypass Controls and Features:     • Front-panel power and mute switches     • Remote volume control     • Manual balance and input selectors     • Magnetic tube-access panel for easy tube rolling