Pro-Ject Pre BoxRS Digital HighendStereo

Pro-Ject Pre Box RS Digital - High-End Stereo Line Tube Preamplifier

The Pro-Ject Pre Box RS Digital is a high-end, versatile preamplifier, DAC, and headphone amplifier designed for audiophiles seeking exceptional sound fidelity and flexibility. Featuring selectable tube or solid-state output stages, it delivers a premium listening experience with advanced digital and analogue connectivity.

Key Features

• Fully balanced double mono design with selectable DAC chips (2x PCM1792 or PCM5102)
• Switchable tube (6922 EH) or solid-state output stage
• Class-A circuitry with no negative feedback for ultra-linear, low-noise performance
• High-quality headphone amplifier with selectable impedance (5 / 20 / 50 ohms)
• 9 digital inputs including USB 2.0 Audio, i²S (RJ45), AES/EBU, Toslink, and S/PDIF coaxial
• Analogue pre-out (XLR & RCA) and RCA line input
• Blue Alps volume control and IR remote included
• Low power consumption with DC power supply and standby mode <1 watt
• Available in black and silver finishes

Specifications

Specification	Details
DAC	DAC1 – 2 x PCM1792 24/192, DAC2 – PCM5102 32/384
Tubes	6922 EH
Digital Inputs	1 x USB 2.0 Audio 32/384 + DoP-DSD 64/128 1 x RJ45 Sonic I2S for CD Box RS in Sonic Mode 2 x S/PDIF 24/192 4 x S/PDIF Optical 24/96 1 x AES/EBU balanced 24/192
Line-Level Input	1 x RCA/phono socket
Input Impedance	33 kΩ
Analogue Outputs	Pre-out (XLR & RCA), Headphone (6.35 mm jack)
Headphone Impedance	Switchable: 5 / 20 / 50 ohms
Analog Input Sensitivity	1.6 V RMS for full headphone output
Frequency Response	20 Hz – 50 kHz (+0 / -0.1 dB)
Signal to Noise Ratio	-100 dB (IEC-A)
THD	0.005% solid-state output / 0.25% tube output
Master Clock Output	16.9344 MHz for CD Box RS in Sonic Mode
Outboard Power Supply	20V / 3A DC (suitable for your country's mains supply)
Power Consumption	300 mA solid / 850 mA tube / 90 mA standby
Dimensions (W x H x D)	206 x 72 x 200 mm (210 mm with sockets)
Weight	1950 g without power supply