Pro-Ject DS3 Tube Box Instruction Manual

: June 14, 2024
: Pro-Ject

Table of Contents

Pro-Ject DS3 Tube Box
Safety instructions
Connections
Settings
Technical data
In case of service
Copyright
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Pro-Ject DS3 Tube Box

Pro-Ject-DS3-Tube-Box-product

Thank you for purchasing a Pro-Ject Audio Systems phono preamplifier.

Warns of danger to the user, the device or possible incorrect operation.
Particularly important note

Safety instructions

Only connect the power supply of the device to a power socket if you have ensured that the mains voltage of the socket to which it is to be connected corresponds to the voltage specified on the power supply. In order to be able to interrupt the connection to the power supply in a dangerous situation, the plug-in power supply must be removed from the main socket. Therefore, ensure unhindered access to the power socket at all times. Always grip the power supply unit by the housing. Do not pull on the cable itself. Never touch the power supply or device with damp or wet hands. Make sure that no liquid gets into the power supply or device, or is dripped or splashed onto it. Never place water containers (e.g. vases) or burning objects (e.g. candles) on or next to the device. Operation in a damp or wet environment is not permitted.

Connections

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Make all connections and disconnections only with the device disconnected from the mains.
A phono input (e.g. marked RIAA, or PHONO) is not a high-level input! Make sure the channels are assigned correctly. Red sockets carry the right channel signal, white sockets carry the left channel signal.
Only use the DC power supply included with the device.

Connecting the record player
Connect the signal cable of the turntable to the input jacks (5-pin mini XLR, XLR, or RCA). When using the RCA input, please also connect the cable lug of the ground cable to the ground terminal of the phono box.

Connection to the amplifier
Connect the Outputs (balanced XLR or RCA) of the phono preamplifier to one of the high-level inputs (e.g. AUX, TAPE, or DAT) of the amplifier.

RCA and XLR outputs are separated and play simultaneously. Therefore, 2 amplifiers can be connected.

Power connection and methods for turning the device on and off
The device is connected to the power supply using the included power adapter. First, connect the plug of the supply cable to the Power 18V socket on the back of the device. Then connect to the power grid.

Switch on or into standby using the button on the device
The button on the left on the front of the device switches the device on and also returns it to standby. The blue light indicator above the button indicates that the device is switched on. If there is a trigger signal, the device cannot be switched off using the button.
Remote switching using a trigger
- The device can be switched on via other box design components if a 12V
- Trigger voltage is present at the 2.5mm socket labeled Trigger Input. Special accessories are available
- Power-on cable (polarity: ) is available in different lengths. The remote switch-on signal can can be forwarded to other devices via the trigger output socket. If the 12V trigger signal is switched off, the device also switches off.

Trigger cables may only be plugged into the sockets when there is no power. Otherwise, the device may be damaged.

Settings

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Input
Selects balanced (5-pin mini-XLR or XLR) or unbalanced (RCA) input.

2 turntables can be connected to the amplifier at the same time and the button acts as an input selector switch. The settings for the respective inputs are saved.

Pickup settings

The three buttons on the right side are used to set input impedance (Loading Ohms), input capacitance (Loading pF), and input gain (Gain dB).
To use the dial, Loading Ohms must be set to Variable. Use the rotary control to adjust the input impedance to the desired value (10Ω-1000Ω). ONLY IMPORTANT FOR LOW-OUTPUT MC CARTRIDGES!
To find out what type your pickup is, refer to your pickup’s product information. This literature also provides the correct input impedance and input capacitance specified in which the pickup should be operated. If in doubt, please contact your dealer.

Examples:

Ortofon 2M Red (MM):
Input impedance 47kOhm, input capacitance 150pF, input gain 40dB
Ortofon X5-MC (High Output MC):
Input impedance 47kOhm, input capacitance 300pF, input gain 40dB
Ortofon Quintet Red (Low Output MC):
Input impedance 50 ohms (set loading ohms to variable & set 50 ohms with the rotary encoder), input capacitance – any (not relevant), input gain 60 dB

Subsonic
The button on the front of the device activates or deactivates the subsonic filter. The LED to the right shows whether the filter is active or not.

Technical data

Technical data Pro-Ject Tube Box DS3 B

Tubes: 2x
Input impedance: Continuously variable 10 – 1000 ohms or fixed 47 kOhm
Input capacitance: 50, 150, 300, 400 pF
Gain (+6dB via XLR out jacks): 40, 45, 50, 55, 60, 65 dB
Signal / Noise Ratio MM (40dB): > 92dBV; 102dBV – ‘A’ weighted
Signal / Noise Ratio MC (60dB): > 78dBV; 87dBV – ‘A’ weighted
THD at 1kHz: <0.003%MM; <0.02% MC
THD (20Hz-20kHz): <0.005%MM; <0.03% MC
RIAA equalization curve accuracy: 20 Hz – 20 kHz / ± 0.5dB
Subsonic filter: at 20Hz with 18dB/octave
Inputs: 1x 5-pin mini XLR / 1x pair of XLR / 1x pair of RCA phono sockets
Line-level output: 1x pair RCA, 1x pair XLR
Power supply DC: 18V/1000mA
Energy consumption: 18V/max. 750mA DC, <0.5W in standby
Dimensions: 206 x 70 x 194 (223 with sockets) mm (W x H x D)
Weight: 1560g without power supply

In case of service

First ask your specialist dealer for advice. Only if the error is confirmed there and cannot be remedied, please send the device to the representative responsible for your country:

Audio Trade GmbH

Schenkendorfstraße 29 D-45472 Mülheim an der Ruhr Tel.: 0208-882 660
Fax: 0208-882 66 66
E-Mail: service@audiotra.de
Internet: www.audiotra.de.

Audio Tuning GmbH

Margaretenstraße 98 A-1050 Wien
Tel.: 01-544 85 80
Fax: 01-545 66 97
E-Mail: service@audiotuning.at
Internet: www.audiotuning.at.

Lakeside Audio SA

Lakeside Audio SA Bahnhofstrasse 29 8810 Horgen
Tel.: +41 44 725 90 21
E-Mail: service@lakesideaudio.ch
Internet: www.lakesideaudio.ch.

We recommend that you keep the original box to ensure safe transport of your device at all times. Guarantee services are only provided for devices that we receive in the original box.

Copyright

Pro-Ject Audio Systems 2023, all rights reserved. The published information corresponds to the status of developments at the time of printing. Technical changes are reserved and will be incorporated into production without further notice.

If you no longer want to use this device and dispose of it, please use the municipal collection points set up for this purpose in Germany and Austria. In Germany, you can also use the sales department’s individual disposal service. Information on this can be found at www.audiotra.de/entsorgung. In Switzerland, the device can be taken to any electrical/TV retailer for disposal.

EU-Konformitätserklärung
We, Canor spol. Ltd. Cooperative 39 08006 Prešov Slovakia (manufacturer) declares under our whole responsibility that the products:

Tube Box DS3 B
which are regularly supplied to

Pro-Ject Audio Systems a division of Audio Tuning GmbH Margaretenstrasse 98 1050 Vienna, Austria

to which this declaration relates is in conformity with the following harmonized standards:

LVD: STN EN 62368-1:2018
EMCD: EN 55032:2015
EMCD: EN 55035:2017

following the provisions of EC directives as follows:

LVD: 2014/35/EU
EMCD: 2014/30/EU

and the EC regulation 1275/2008 and its framework directive 2009/125/EC for energy-related products (ErP) according to the test performed under the following technical standard