The Phono Box RS is an ultra-low noise and distortion phono preamplifier for the analog audio purist. Designed to deliver breathtaking performance from your phono cartridge trough the availability of an unprecedented range of adjustments. Proper impedance matching is key to great sound and the Phono Box RS provides the ability to continulessly vary impedance from 10-1,200 ohms, even during playback! Top grade component parts are used throughout the dual mono circuit topology ensuring exceptional quietness and purity of sound. Unique features include a fully passive selectable RIAA and DECCA phono equalization circuit, full compatibility with MC and MM cartridges via selectable load capacitance and fully balanced inputs and outputs. Heavily shielded chassis metalwork is used to protect against the negative effects of vibration and electrical interference. The Phono Box RS is a high-performance value ‐ rarely is there a product that delivers such clear, detailed and smooth sound from vinyl records at such a modest price. Specs Input impedance, variable: stepless 10ohms – 1.200ohms A Input capacitance/impedance: 100pF, 200pF, 300pF, 420pF and 520pF */47kohms B Input impedance, fixed: 10ohms A Input gain (+ 6dB using XLR sockets): 40dB and 50dB B / 60dB A Noise floor: 91dB (A weighted) THD: 0,019% De-emphasis curve accuracy: 20Hz – 20kHz / max. 0,3dB Subsonic filter: at 20Hz with 12dB/octave Input: 1 pair RCA/phono sockets, 1 pair XLR sockets Line-level output: 1 pair RCA/phono sockets, 1 pair XLR sockets Wiring XLR sockets: 1 ground, 2 “hot” and 3 “cold” Outboard power supply: ±18V/250mA DC, suitable for your country’s mains supply Power consumption: 150mA DC, <1W in standby A: typical for low output MC cartridges, B: typical for MM cartridges or high output MC *Input capacitance is irrelevant for low output MC cartridges.