Stereo Box RS - Receiver PRO-JECT - Free user manual and instructions

Brand	Pro-Ject
Model	Stereo Box RS
Product Type	Integrated Stereo Receiver
Tube Complement	2 x ECC88 (6922)
Power Output	2 x 80W (8 ohms) / 2 x 120W (4 ohms)
Frequency Response	20 Hz - 50 kHz (-1.5 dB / -3 dB)
Noise Floor	90 dB (A-weighted)
Total Harmonic Distortion	0.1% at 100W
Gain	31 dB
Input Impedance (RCA)	50 kohms
Input Impedance (XLR)	20 kohms
Number of Line-Level Inputs	6 (5 RCA + 1 XLR)
Pre-Out Output	Variable (RCA), gain 12 dB
Subwoofer Output	RCA, gain 18 dB
Record Output	Fixed (RCA), gain 0 dB
Speaker Connections	Banana plugs, spades, bare wire (4mm)
Power Supply	Outboard ±48V DC, 2.5A
Power Consumption	<1W standby, 2.5A operating
Remote Control Battery	1 x CR2032 or CR2025 (3V)
Dimensions (W x H x D)	206 x 72 x 200 (210) mm
Weight	2650 g (without power supply)
Cleaning	Wipe with a dry, soft cloth
Repair and Spare Parts	Contact dealer; tubes replaceable by qualified technician

Frequently Asked Questions - Stereo Box RS PRO-JECT

How do I connect the Stereo Box RS to my speakers?

Use speaker cables with banana plugs, spades, or bare wire (4mm diameter). Connect the red terminal to positive (+) and black to negative (-) on both amplifier and speaker. Ensure impedance is at least 4 ohms per channel.

How long does it take for the tubes to warm up?

After switching on, the tubes require a short warm-up period. The blue LED blinks during warm-up and stays solid when the unit is ready. We recommend setting volume to 0 before powering on.

How do I select the input source?

Use the small switch next to the six LEDs on the front panel. Each press cycles through inputs, and the corresponding LED lights up to indicate the selected input.

Can I connect a subwoofer to the Stereo Box RS?

Yes, connect an active subwoofer to the Sub Out RCA sockets. The subwoofer output has a fixed gain of 18 dB.

How to connect a headphone amplifier?

Use the Out Fix RCA sockets, which provide a fixed output level (0 dB). Connect these to your headphone amplifier's input.

What type of power supply does the Stereo Box RS use?

It uses an outboard power supply providing ±48V DC at 2.5A. Only use the supplied power supply; do not substitute.

How to replace the remote control battery?

Unlock and slide open the battery compartment. Replace with one CR2032 or CR2025 (3V) battery, ensuring correct polarity. Close the cover.

What is the purpose of the Pre Out (Out Variable)?

The Out Variable provides a variable output signal (gain 12 dB) for connecting a power amplifier or active speakers. Volume is controlled by the Stereo Box RS.

Why is the blue LED blinking?

The blinking blue LED indicates the tubes are warming up. When the LED stays solid, the unit is ready for use.

Can I use the Stereo Box RS with XLR inputs?

Yes, input IN 6 is an XLR balanced input. Wiring: pin 1 ground, pin 2 hot (+), pin 3 cold (-). Input impedance is 20 kohms.

USER MANUAL Stereo Box RS PRO-JECT

BY PRO-JECT AUDIO SYSTEMS

INSTRUCTIONS FOR USE Pro-Ject Stereo Box RS

Dear music lover,

thank you for purchasing a PRO-JECT AUDIO amplifier.

In order to achieve maximum performance and reliability you should study these instructions for use carefully.

Warning of a hazard for the user, the unit or possible misuse

Important notice

Safety instructions

AC outlet voltages vary from country to country. Before connecting to the mains, make sure that the voltage in your area meets the voltage requirements printed on the power supply.

The power supply is used to disconnect the unit from the mains. Make sure that the power supply is easier accessible at all times. Never handle the device, the power supply while your hands are wet or damp.

Avoid letting liquids enter the device or the power supply. Never place any item containing liquid, such as a flower vase on or near the device. Never spill any liquid on the device or the power supply. Never place any naked flame sources, such as lighted candles on or near the device. The product shall be used in damp or wet locations, next to a bathtub, sink, swimming pool or any other similar condition Tubes produce heat. Proper ventilation has to be guaranteed all the time. The unit must not be stacked.

Connectors

Make all connections whilst the amplifier is disconnected from the power supply.

Take care to connect the left and right channels correctly. The right channel is usually marked red, the left channel black or white.

The red speaker terminals carry the positive signal (+), the black speaker terminals the negative signal (−). Make sure the polarity of the connection is correct at each end of the cables.

Only connect one loudspeaker with an impedance not less than 4 ohms per channel.

Wiring XLR sockets: 1 ground, 2 "hot" and 3 "cold".

Never use any other power supply than the one supplied with the unit.

Inputs

Line level sources such as a CD player or a tuner can be connected to the input sockets marked IN 1 - IN 6.

Subwoofer output

An active subwoofer may be connected to the output sockets marked Sub.

Pre Out

A power amplifier or active loudspeakers can be connected to the output sockets marked Out Variable.

Record output, connecting a headphone amplifier

Out Fix connects an analogue record device ore a Pro-Ject Head Box headphone amplifier.

Out Fix provides a fixed output level.

Mains power connection

Connect the low voltage plug from the power supply to the 2x48V= socket of the amplifier before connecting the power supply to the mains.

Remote control

turns the unit on or back into standby

and

adjust the sound volume

and

select the inputs

Front panel controls

To switch on from standby or to standby

The switch on the left hand side of the front panel turns the unit on or back into standby. The blue LED above the stand-by switch shows that the unit is switched on.

After switching on, the tubes need a short time to reach the correct operating temperature. Du warm up the blue LED above the stand-by switch is blinking.

We recommend to set the volume control to 0, prior to switching on.

Input selector

After the unit is powered on, operating the switch next to the six LEDs selects the inputs. The selected input will be shown by the corresponding LED.

Volume

Adjust the volume to the desired level, using the large knob on the front panel.

Replacing batteries

Proceed as follows:

• Unlock and slide open the battery case cover
• Replace the battery.
  Make sure the battery is the right way round!
• Close the battery case cover

Battery type: 1 x CR2032 / 3V or 1 x CR2025 / 3V

Diagram showing a device with a circular arrow indicating rotation or movement, no text or symbols present

Do not dispose the batteries as ordinary domestic refuse. Please dispose your exhausted batteries at the appropriate collection sites - usually located at supermarkets and drugstores.

Technical specifications Pro-Ject Stereo Box RS

Tubes: 2 x ECC88 (6922)

Power output: 2 x 80W/120W at 8 ohms/4 ohms (both channels driven)

Frequency response: 20Hz - 50kHz (-1,5dB/-3dB)

Noise floor: 90dB (A weighted)

THD: 0,1% (100W)

Gain: 31dB

Pre out (Out Variable): RCA/phono sockets, gain 12db

Subwoofer out (Sub): RCA/phono socket, gain 18dB

Record out (Out Fix): RCA/phono sockets, gain 0dB (Fixed output signal)

Line-level inputs: 4 pair RCA/phono sockets and 1 pair XLR sockets

Input impedance: 50kohms for RCA input In 1 - In 5 and 20kohms XLR input In 6

Wiring XLR sockets: 1 ground, 2 "hot" and 3 "cold"

Speaker connectors: 4mm ∅ banana plugs, spades connectors or naked wire

Outboard power supply: ±48V/2,5A DC, suitable for your country's mains supply

Power consumption: 2,5A DC, <1W in standby

Replacement battery remote control: 1 x CR2032 / 3V or 1 x CR2025 / 3V

Dimensions W x H x D (D with sockets): 206 x 72 x 200 (210)mm

Weight: 2650g without power supply

Service

Should you encounter a problem which you are not able to alleviate or identify, please contact your dealer for further advice. Only when the problem cannot be resolved there should the unit be sent to the responsible distributor in your country.

Warranty

The manufacturer accepts no responsibility for damage caused by not adhering to these instructions for use. Modification or change to any part of the product by unauthorized persons, release the manufacturer from any liability over and above the lawful rights of the customer.

Copyright

Pro-Ject Audio Systems is a Registered Trademark of H. Lichtenegger.

This guide was produced by: Pro-Ject Audio Systems Copyright © 2014. All rights reserved.

The information was correct at the time of going to press. The manufacturer reserves the right to make changes to the technical specification without prior notice as deemed necessary to uphold the ongoing process of technical development.