The Pro-Ject Head Box S2 headphone amplifier does not take up a lot of space. It has a steel and aluminium sandwich casing to protect if against electromagnetic interferences and vibrations.
Pro-Ject Head Box S2: front panel
On the front panel, there are 2 jack outputs (3.5mm and 6.35mm) which serve to connect any type of Hi-Fi headphones. There is also a large volume button. The 2 jack outputs can be used simultaneously so that you can connect 2 headphones and divide the output volume between the 2 headphones.
The front panel also includes a small button which serves to turn on and off the device.
Pro-Ject Head Box S2: back panel
On the back panel, there is a RCA output and a RCA input.
The RCA input enables you to connect the line output of your amplifier or any other Hi-Fi source (CD player, streamer, DAC, etc).
The “loop” RCA output serves to connect the Head Box S2 to another line input on your amplifier.
Pro-Ject Head Box S2: listening and review
The Pro-Ject Head Box S2 headphone amplifier has a consequent output level that can go up to 725mW, and delivers a rich and dynamic sound that is also transparent.
This is a good headphone amplifier at a very affordable price in order to complete your Hi-Fi system !
Input: 1 x RCA
Outputs: 1 x 6.35mm jack; 1 x 3.5mm jack
Loop output: 1 x RCA
Output level: 725mW (at 32 Ohms)
Frequency response: 20Hz to 80 Khz (+/-0,2dB)
Gain: 11 dB
Power supply: 5V 500mA DC
Consumption in standby: inferior to 0,5W
Dimensions: 103 x 37 x 120 mm
Weight: 365g (without power supply)