Pro-ject Audio Phono Box DS2 USB User Instruction

INSTRUCTIONS FOR USE

Pro-Ject Phono Box DS2 USB

Dear music lover,

thank you for purchasing this 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.

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 of record players

Connect left and right channels of the tonearm signal lead to the sockets marked phono 1 or Phono 2 of the phono amplifier. It is possible to connect 2 record players at once or connect 2 tonearms from a turntable equipped by 2 tonearms. The earthing wire(s) may be connected to the screw terminal if you encounter hum problems when using the record player.

Line level input

Any line level source of signal can be connected to the preamplifier using Line 3 socket on the backpanel and then converted to digital data using coaxial S/PDIF output or USB output.

2	© Pro-Ject Audio Systems · Pro-Ject Phono Box DS2 USB · Revision 2017.03.31

Connection to the amplifier

Connect the Output of the phono amplifier to a line input (such as AUX, CD, Tuner, Tape or Video) on your amplifier.

Alternatively connect the S/PDIF digital output to the corresponding digital input of the amplifier or soundbar.

Mains power connection and methods to switch the unit on and off

Connect the low voltage plug from the power supply to the Power 18V socket of the preamplifier before connecting the power supply to the mains. The unit can be switched on and off by using 2 different methods which are equal in priorities.

1. Using front pushbutton to switch on or into standby

The pushbutton on the front panel of the unit alternately turns the power on or returns it to standby mode. The blue LED on the front panel shows that the unit is powered on. If a trigger signal is present the unit can’t be switched off by the pushbutton.

2. Remote power on - triggers

The unit can be switched on via other Box Design components when a 12V trigger voltage is present at the

2.5mm socket marked Trigger Input. Special power-on cables (polarity ) in diverse lengths are available as accessories. The remote power-on signal can be relayed to further units via the Trigger Output socket. When the 12V trigger signal is switched off, the unit will also switch off.

Trigger cables may only be plugged into the sockets when the unit is disconnected from the power supply and from the mains. Failure to do so may result in damage of the unit.

Front panel

Settings

The three function keys Loading Ω, Loading pF, Gain dB on the right hand side are used to set input impedance, input capacitance and input gain. All settings are stored automatically.

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.

© Pro-Ject Audio Systems · Pro-Ject Phono Box DS2 USB · Revision 2017.03.31

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Loading Ω (input impedance)

The button Loading Ω sets the input impedance to desired value (low output MC cartridges: 10Ω-20Ω-50Ω- 100Ω-200Ω-1kΩ or 47kΩ for high output MC and MM cartridges)

Loading pF (input capacitance)

The button Loading pF sets the capacitance for high output MC and MM cartridges. (Input capacitance is irrelevant for low-output MC cartridges)

pF - all LEDs off = 47pF. LEDs pF 100, 220 and 320 - readout always + 47pF

Gain dB

Gain for the outputs can be set from 40dB to 65dB in steps of 5dB or 10dB. Any change will be automatically stored for the chosen input, when input is changed or the unit is switched into standby mode.

Examples of typical settings

	Ortofon 2M Red (MM)		input impedance:	47kohms
			input capacitance: 100pF
			input gain:	40dB
	Ortofon X5-MC (High-Output MC)		input impedance:	47kohms
			input capacitance: 320pF
			input gain:	50dB
	Ortofon Rondo Red (Low-Output MC)		input impedance:	10ohms.
			input capacitance is irrelevant
			input gain:	60dB

Input selector

After the unit is powered on, operating the push button Input selects the inputs. The selected input will be indicated by the corresponding LED:

1 – Phono 1

2 – Phono 2

3 – Line 3

Sampling frequency

If USB Out is not in use: The push button Sampling kHz selects the frequency of digital output signal for S/PDIF Out. Available settings are 48/96/192kHz. The selected frequency will be indicated by the corresponding LED.

If USB Out is connected and active, sampling rate is set from computer. If frequency is set to 48, 96 or 192kHz, then S/PDIF Out is active and is set to the same frequency as USB Out. Setting computer to higher frequency (352,8kHz or 384kHz) deactivate S/PDIF Out and allows to record in DSD128 format. (frequency always indicated by corresponding LED´s).

Subsonic

The push button turns on and off subsonic filter

Setting the record level

Record level knob on a front panel set the level of analogue signal going to the A/D converter. Clipping LED indicates when the level is too high and signal is distorted.

4	© Pro-Ject Audio Systems · Pro-Ject Phono Box DS2 USB · Revision 2017.03.31