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• Fully balanced double mono design  
• Tube input stage
• Class-A FET output stage
• Switchable output impedance for ultimate performance
• Superior low distortion
• Low noise components for ultimate dynamic & detail
• Output: 6,3mm socket
• Full metal casing in silver or black
• Optional Upgrade: Linear power supply Power Box RS Uni 1 (or 4) for further improved sound quality

Head Box RS

  • Ultimate highend headphone sound!  

    Head Box RS is a reference quality headphone amplifier with fully balanced tube input stage (double triode tube 6922) and single ended, class A „FET (Field Effect Transistor)“ output stage. It offers balanced and unbalanced input as well as balanced and un-balanced by-pass connectors for using the pass-through input signal with other components.  

    Volume control consists of a precise volume regulator with matched resistance between left and right channel.  

    A special output impedance selector allows to adjust output impedance in three steps 5, 20 and 50 ohms to achieve better im-pedance matching between amplifier and headphones. Some experiments with different positions of output impedance selector are highly recommended to get the ultimate sound experience for your headphone.  

    An advanced multi-stage power supply with four different output voltages is used to achieve the best possible S/N ratio for out-standing reproduction of detail, dynamics and imaging with any dynamic headphone!  

  • Technical data

    Pro-Ject Head Box RS

    Line-level input/output 1 pair RCA/phono & 1 pair XLR each
    Power output 350mW / 32 ohms, 60 mW / 300 ohms
    Crosstalk -58dB
    Signal-to-noise -99dB
    THD (IMD) 0,17% (XLR in, output impedance setting 5 ohms, load 32 ohms)
    Gain 9dB
    Outboard power supply 20V/3A DC suitable for your country's mains supply
    Power consumption 1,3A DC
    Dimensions W x H x D 206 x 72 x 200 (209) mm (D with sockets)
    Weight 2150g (without power supply)
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