Pro-Ject Audio Systems BOX-DESIGN Tube Box S2 User manual

INSTRUCTIONS FOR USE
Pro-Ject Tube Box S2

© Pro-Ject Audio Systems · Pro-Ject Tube Box S2 · Revision 2017.12.5
2
Dear music lover,
thank you for purchasing a Pro-Ject Audio Systems 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 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.
Setting for MM and high output MC cartridges
47pF is basic is the lowest fixed setting. DIP switches 1, 2 and 3 add more capacitance
input capacitance 147pF (1-OFF, 2-OFF, 3-ON)
input capacitance 267pF (1-OFF, 2-ON, 3-OFF)
input capacitance 367pF (1-ON, 2-OFF, 3-ON)
input capacitance 487pF (1-ON, 2-ON, 3-OFF)
input capacitance 587pF (1-ON, 2-ON, 3-ON)
DIP switches 4-8 are OFF, it represent value 47kohms.
Setting for MC cartridges
Input capacitance is irrelevant for low-output MC cartridges
input impedance 10ohms (4-OFF, 5-OFF, 6-OFF, 7-OFF, 8-ON)
input impedance 100ohms (4-OFF, 5-OFF, 6-OFF, 7-ON, 8-OFF)
input impedance 470ohms (4-OFF, 5-OFF, 6-ON, 7-OFF, 8-OFF)
input impedance 1kohms (4-OFF, 5-ON, 6-OFF, 7-OFF, 8-OFF)
input impedance 2kohms (4-ON, 5-OFF, 6-OFF, 7-OFF, 8-OFF)
(Combinations are also possible)

© Pro-Ject Audio Systems · Pro-Ject Tube Box S2 · Revision 2017.12.5
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Examples of typical settings
Ortofon 2M Red (MM)
input capacitance 147pF, input impedance 47kohms
3-ON
rest- OFF
Ortofon X5-MC (High-Output MC)
input capacitance 367pF, input impedance 47kohms
1,3-ON
rest- OFF
Ortofon Rondo Red (Low-Output MC)
input impedance 10ohms, Input capacitance is irrelevant for low-output MC cartridges
8-ON
rest- OFF
Connectors
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 DC socket of the phono amplifier before
connecting the power supply to the mains.

© Pro-Ject Audio Systems · Pro-Ject Tube Box S2 · Revision 2017.12.5
4
Front panel controls
Stand-By
The button on the left side of a front panel of the unit turns the unit on or returns it to standby mode. The blue
LED above the stand-by push button shows that the unit is switched on.
Gain setting
Buttons marked with ◄and ► set gain of the amplifier. Selected value is indicated by LED. Possible settings
are 40, 43, 50, 53, 60 and 63dB.
Subsonic
The button on the right side of a front panel turns on and off subsonic filter. The blue LED above the button is
illuminated when it´s on.
Technical specifications Pro-Ject Tube Box S2
ATypical for low output MC cartridges, Btypical for MM or high output MC cartridges
* Input capacitance is irrelevant for low-output MC cartridges
Tubes: 2 x ECC83 (12AX 7A)
Input impedance: 10ohms, 100ohms, 1kohm, 2kohms A,
Input capacitance/impedance: 47pF, 147pF, 267pF, 367pF,487pF and 587pF*/47kohms B
Together with other input impedance settings without any influence!
Input gain: 40dB,43dB B ; 50dB, 53dB and 60dB, 63dB A
Noise floor: 80dB (A weighted) at 40dB input gain
75dB (A weighted) at 50 dB and 63dB input gain
THD: <0,02% at 40dB input gain
<0,05% at 50dB and 63dB input gain
RIAA-equalisation curve accuracy: 20Hz - 20kHz / max. 0,4dB
Subsonic filter: at 20Hz with 18dB/octave
Input: 1 pair RCA/phono sockets
Line-level output: 1 pair RCA/phono sockets
Outboard power supply: 18V/1.000mA DC, suitable for your country's mains supply
Power consumption: 470mA DC, <1W in standby
Dimensions W x H x D (D with sockets): 103 x 73 x 119 (131)mm
Weight: 410g without power supply

© Pro-Ject Audio Systems · Pro-Ject Tube Box S2 · Revision 2017.12.5
5
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.
Should you encounter a problem which you are not able to alleviate or identify, please contact your dealer for
further advice. Only if the problem cannot be resolved there, the unit should be sent to the responsible
distributor in your country.
Service
Should you encounter a problem which you are not able to alleviate or identify, please contact your dealer for
further advice. Only if the problem cannot be resolved there, the unit should 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 changes 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, trademarks
Pro-Ject Audio Systems is a registered Trademark of
H. Lichtenegger.
This guide was produced by: Pro-Ject Audio Systems
Copyright ©2017. 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.

PRODUCT INFORMATION
Technical data and price changes reserved.
Page 1/2
PRO-JECT AUDIO SYSTEMS
www.project-audio.com
• Suitable for MM and MC cartridges
• Precise RIAA equalisation in two parts, passive/active
• Fully discreet circuit design without OpAmps
• 2x ECC83 tubes (replaceable)
• Front-sided Subsonic lter button
• Front-sided Gain control
• Ultra low noise circuitry with FET input stage
• Dual mono circuitry for optimized channel separation
• Polystyrene capacitors used where possible
• Gold-plated RCA in and outputs
• External power adaptor and multiple internal power
supplies
• Well-ltrated high-voltage anode power supply
• Sandwich alu/metal casing protects from vibrations
and electromagnetic interference
• Finishes: silver or black
Tube assembly: 2x ECC83 (12AX7)
Input impedance: 10/100/470/1k/2k ohms, x 47k ohms
Capacitance: 50 / 150 / 270 / 370 / 490 / 590 pF
Gain MM / MC: 40 / 43 / 50 / 60 / 63 dB
Signal-to-noise ratio: 77dBA
THD+N: < 0,0025%
RIAA curve accuracy: +/- 0,4dB/20Hz - 20kHz
Subsonic lter: 20Hz @ 12dB/octave
Input / Output: 1x RCA / 1x RCA
Dimensions WxHxD: 103 x 73 x 119 mm
TUBE BOX S2
Tube phono-preamplier
MSRP 359 € (incl. VAT)
colour options:

PRODUCT INFORMATION
Technical data and price changes reserved.
Page 2/2
PRO-JECT AUDIO SYSTEMS
www.project-audio.com
Innovative miniature sized phono
preamplier with tube output and high
end sound!
Tube Box S2 is our very rst product to feature a
fully discreet circuit design without using any
operational ampliers (OpAmps). It also is the rst
producttocomewithreplaceabletubesfortuberollingand
sound-shaping. This gives the customer many options
to pick from and alter the sound signature to his prefe-
rence. Tube Box S2 will give a full and relaxed laid back
sound with lush mids, just like you would expect it from a
much bigger high end tube phono pre-amplier. It oers
support for both MM and MC cartridges and comes with
many gain settings to be switched on the front panel. Five
variable input impedance settings are available to adjust
to any MM cartridge, the 47k ohms input impedance
setting is xed and suited for high output MC
cartridges. The aluminium/metal casing is adapted to
our DS2 line in looks and protects against vibrations and
electromagnetic interferences for superior sound. A true
high end solution in a much smaller package!