Pro-Ject Head Box RS  

Highend headphone amplifier  


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open page Specifications       PDF Productinfo [pdf, 708 KB]       PDF User Manual [pdf, 152 KB]       

• 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  


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!  


SRP: € 799,00  


Recommended accessoires:  


The addition of linear power supply Power Box RS Uni 1-way (SRP € 399,00) or Power Box RS Uni 4-way
(SRP € 599,00) adds even more depth and lets you hear all microscopic fine detail.  

Power Box RS Uni 1-way

Power Box RS Uni 4-way

CAUTION: Please check the power connection of your Head Box RS on the rear side. In case of an 18V 2.5 connection, a Connect It Power MiniXLR 18V 2.5 adapter cable is necessary to power the unit with a Power Box!  


Last update 12.07.2018

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