BOX DESIGN Pro-Ject Phono Box S Instruction Manual
- June 7, 2024
- BOX DESIGN
Table of Contents
BY PRO-JECT AUDIO SYSTEMS
INSTRUCTIONS FOR USE
Pro-Ject Phono Box S
Dear music lover,
thank you for purchasing a PRO-JECT AUDIO phono 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 easily 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 not be used in damp or wet locations, next to a bathtub, sink, swimming pool or any other similar conditions.
Settings
Use the dip switches at the bottom of the unit to set input gain, input
capacitance and input impedance. Please set both channels equally.
To find out which type your cartridge is please consult the literature
accompanying your cartridge. The literature for cartridges should also specify
the correct input impedance (low-output MC cartridges) and the correct input
capacitance (high-output MC and MM cartridges), into which the cartridge is
designed to work. If in doubt please consult your dealer.
To alter settings the unit must be disconnected from the power supply and the amplifier.
Examples of typical settings
Ortofon 2M Red (MM)
input gain 40dB, input capacitance 200pF, input impedance 47kohms| 
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Ortofon X5-MC (High-Output MC)
input gain 43dB, input capacitance 420pF, input impedance 47kohms| 
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Ortofon Rondo Red (Low-Output MC)
input gain 60dB, input capacitance , input impedance 10ohms. Input
capacitance is irrelevant for low-output MC cartridges| 
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2 © Audio Trade GmbH · Pro-Ject Phono Box S · Revision 2013.1.15
Input impedance – high-output MC and MM cartridges
47kΩ 100pF 200pF 320pF 420pF
Input impedance - low-output MC cartridges
- Input capacitance is irrelevant for low-output MC cartridges
10 Ω 100 Ω 1k Ω
Input gain
40dB 43dB 60dB 63dB
Subsonic filter
A switch at the back of the phono amplifier activates and deactivates the
subsonic filter.
OFF, ON, Subsonic
© Audio Trade GmbH · Pro-Ject Phono Box S · Revision 2013.1.15 3
Connectors
RoHS, Left, Right, In OFF, ON, Out, Power 18V, SN:, Pro-Ject Audio
Systems, Vienna, Austria
Make all connections whilst the phono 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.
Do not connect the phono amplifiers output to a phono input (sometimes
labelled gram, disc or RIAA ) on the amplifier.
Never use any other power supply than the one supplied with the unit.
Connecting the record player
Connect the tonearm signal lead to the In of the phono amplifier. The
earthing wire may be connected to the screw terminal if you encounter hum
problems when using the record player.
Connection to the amplifier
Connect the Out of the phono amplifier to a line input (such as AUX, CD,
Tuner, Tape or Video ) on your amplifier.
Mains power connection
Connect the low voltage plug from the power supply to the Power 18V socket
of the phono amplifier before connecting the power supply to the mains.
Stand-By
The button on the front panel of the unit alternately turns the power on or
returns it to standby mode. The blue LED above the stand-by push button shows
that the unit is switched on.
4 © Audio Trade GmbH · Pro-Ject Phono Box S · Revision 2013.1.15
Technical specifications Pro-Ject Phono Box S
A Typical for low output MC cartridges, B typical for MM or high output MC cartridges
- Input capacitance is irrelevant for low-output MC cartridges
Input impedance:
10ohms, 100ohms, 1kohm A
Input capacitance / impedance:
100pF, 200pF, 320pF and 420pF */47kohms B
Together with other input impedance settings without any influence!
Input gain:
40 and 43dB B / 60 and 63dB A
Noise floor:
94dB (A weighted) at 40dB and 43dB input gain
75dB (A weighted)at 60dB and 63dB input gain
THD:
<0,01% at 40dB and 43dB input gain
<0,05% at 60dB and 63dB input gain
RIAA-equalisation curve accuracy:
20Hz – 20kHz / max. 0,4dB
Subsonic filter:
at 20Hz with 12dB/octave
Input:
1 pair RCA/phono sockets
Line-level output:
1 pair RCA/phono sockets
Outboard power supply:
18V/500mA DC, suitable for your country’s mains supply
Power consumption:
85mA DC, <1W in standby
Dimensions W x H x D (D with sockets):
103 x 36 x 104 (115)mm
Weight:
570g without power supply
Potential incorrect use and fault conditions
No signal on one or both channels:
No connection between player and phono amplifier or amplifier. This could be
due to a faulty plug, broken wire or solder joint or simply loose plug/socket
connection.
Strong hum:
No earth connection from cartridge or arm, or arm cable to phono amplifier, or
earth loop.
Output too quiet or too loud, or distorted:
Input gain incorrectly set – input overloading or insufficiently amplified.
Service
Should you encounter a problem which you are not able to alleviate or identify
despite the above information, 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.
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.
Copyright
PRO-JECT is a Registered Trademark of H. Lichtenegger.
This guide was produced by: Audio Trade GmbH
Copyright © 2012. All rights reserved.
© Audio Trade GmbH · Pro-Ject Phono Box S · Revision 2013.1.15 5
Documents / Resources
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