Amp Box RS2 High-End Stereo / Mono Power Amplifier The Amp Box RS2 is Pro-Ject's reference-class power amplifier, designed to deliver exceptional musicality, three-dimensional sound staging, fine micro-dynamics and impressive power reserves. Its fully discrete Class AB architecture combines the sonic refinement of Class A designs with the efficiency and output capability of Class B amplification. The amplifier can operate either as a stereo power amplifier or in bridged mono mode for significantly increased output power. A reference-quality tube buffer input stage enhances musicality, while balanced and single-ended inputs provide maximum system flexibility. The robust full-metal enclosure improves heat dissipation and protects the circuitry from vibrations and electromagnetic interference. For even greater performance, the Amp Box RS2 can be upgraded with the optional Power Box RS2 Amp linear power supply.   KEY FEATURESAmplifier TypeFully Discrete Class ABOperation ModesStereo or Bridged MonoInput StageReference Quality Tube BufferCircuit DesignFully Discrete ArchitectureInputsBalanced XLR & Single-Ended RCASpeaker TerminalsGold-Plated High-Quality ConnectorsControl InterfaceRS232ConstructionFull Metal ChassisFinish OptionsSilver or BlackManufacturingMade in EuropeOptional UpgradePower Box RS2 Amp Linear Power Supply   POWER OUTPUTStereo Mode (8 Ω)2 × 80 WStereo Mode (4 Ω)2 × 130 WMono Bridged (8 Ω)280 WPeak Output (8 Ω)2 × 100 WPeak Output (4 Ω)2 × 160 WPeak Output Bridged350 W / 8 Ω   AUDIO PERFORMANCEFrequency Response20 Hz – 20 kHz (< -0.2 dB)THD< 0.08% @ 20 W / 4 ΩGain27 dBSignal-to-Noise Ratio97 dBV (100 dBV A-weighted)Noise Floor-73 dBV (-76 dBV A-weighted)Channel Separation-58 dB @ 10 kHz / 4 Ω   INPUTS & CONNECTIONSLine Inputs1 × RCA Stereo, 1 × Balanced XLRInput Impedance (RCA)47 kΩInput Impedance (XLR)20 kΩSpeaker Outputs4 mm Banana, Spade or Bare WireRS232 Interface3-Pin Terminal Block   POWER SUPPLYExternal Power Supply±40 V / 5 A DCMains Compatibility100 – 240 V, 50/60 HzStandby Consumption< 0.5 W   DIMENSIONS & WEIGHTDimensions (W × H × D)206 × 85 × 200 mmDimensions with Connectors206 × 85 × 227 mmWeight2.66 kg (without power supply)