Pro-Ject Audio Systems DS3 B Phono Preamp Instruction Manual

Pro-Ject Audio Systems DS3 B Phono Preamp

Specifications

• Frequency response: 10Hz-55kHz ±1 dB
• Recommended load for output: 47 kOhm //100pF
• Input: 1x pair RCA phono unbalanced sockets

Product Usage Instructions

Safety Instructions

1. Never handle the device with wet or damp hands.
2. Avoid letting liquids enter the device.
3. Do not place any liquid-containing items near the device.
4. Never spill any liquid on the device or power supply.
5. Avoid placing naked flame sources near the device.
6. Do not use the product in damp or wet locations.

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

Connecting the Record Player

Connect your record player’s phono RCA or XLR outputs to the Left and Right Inputs of the step-up transformer.
If connecting the lead to the RCA input, also connect the grounding wire to the screw terminal of the Phono Box.

Connection to Amplifier or Phono Stage
Connect the RCA or XLR Left and Right Outputs of the step-up transformer to an MM phono input on your amplifier or dedicated phono stage.

Input/Output Setting
Select between XLR and RCA connections using the Input and Output buttons on the front panel of the device.

Cartridge Settings

1. Use push buttons on the back panel for Recommended Cartridge Impedance and on the front panel for Gain adjustment.
2. Experiment with different Gain settings to find what works best with your amplifier or MM phono preamp.
3. Consult the literature accompanying your cartridge for Recommended Cartridge Impedance. If unsure, consult your dealer.

Remember:
Trust your ears and experiment with different settings to find your preferred sound.

Dear music lover,
thank you for purchasing a Pro-Ject Audio Systems step up transformer. 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.

Safety instructions

• Never handle the device while your hands are wet or damp.
• Avoid letting liquids enter the device. 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.

Connectors

• 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 step-up transformer’s output to a MC phono input or to a line input on your amplifier.

Connecting the record player
Connect your record player’s phono RCA or XLR outputs to the Left and Right Inputs of the step-up transformer. If you connected the lead to the RCA input, please also connect the grounding wire to the screw terminal of the Phono Box.

Connection to the MM input on amplifier or MM phono stage
Connect the RCA or XLR Left and Right Outputs of the step-up transformer to a MM phono input on your amplifier or dedicated phono stage.

The MC Step Up Box DS3 B is a passive device, it does not require power.

Input / Output setting
Select between XLR (=button out ) and RCA (button in ) connections with the Input and Output buttons on the front panel.

Cartridge settings

• Push buttons on the back panel for Recommended Cartridge Impedance and front panel for Gain are used to fine-tune the settings for your MC cartridge.
• For the Gain setting, experiment with both settings to find out which works best with your amplifier or MM phono preamp and the rest of your source devices.
• To find out the Recommended Cartridge Impedance for your cartridge consult the literature accompanying your cartridge. If in doubt, please consult your dealer.

Remember as with many things analog:
trust your ears. Experiment with different settings and find out what you like most!

Examples:

• Ortofon Quintet Red/Blue/Bronze/Black
  Impedance >20 ohms -> Gain 24 or 30dB; Recommended Cartridge Impedance button out

• Ortofon Cadenza Red/Blue/Bronze
  Impedance 50-150 ohms -> Gain 24 or 30dB; Recommended Cartridge Impedance button out

• Ortofon Cadenza Bronze/Black
  Impedance >10 ohms -> Gain 24 or 30dB; Recommended Cartridge Impedance button out or in

Technical specifications Pro-Ject MC Step Up Box DS3 B

• Frequency response 10Hz-55kHz:
  • +-1 dB
• Recommended load for output:
  • 47 kOhm //100pF
• Input MC:
  • 1x pair RCA phono unbalanced sockets
  • 1 x pair XLR sockets
• Output :
  • 1x pair RCA phono unbalanced sockets
  • 1 x pair XLR sockets
• Dimensions W x H x D (D with sockets):
  • 206 x 79 x 197 (209) mm
• Weight:
  • 1740g

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. Wrong input/output selection.

Strong hum:
No earth connection from cartridge or arm, or arm cable to phono amplifier, or earth loop. Wrong input/output selection.

Service
Should you encounter a problem that 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 ® 2023. 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.

EU-Conformity Declaration

• We, Canor spol. s r.o.
• Druzstevná 39
• 08006 Presov
• Slovakia
• (Manufacturer)

declare under our whole responsibility that the products:

MC Step Up 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 EN 50564:2011 Pro-Ject Audio Systems a division of Audio Tuning GmbH 1050 Vienna, Austria, Margaretenstrasse 98 info@project- audio.com

• Pro-Ject Audio Systems
• Pro-Ject MC Step Up Box DS3 B
• Revision 2023.09.13

FAQ

Q: Is the MC Step-Up Box DS3 B a passive device?
A: Yes, the MC Step-Up Box DS3 B is a passive device and does not require power.

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