Pro-Ject Audio Systems Phono Box DS2 USB User manual

INSTRUCTIONS FOR USE
Pro-Ject Phono Box DS2 USB

© Pro-Ject Audio Systems · Pro-Ject Phono Box DS2 USB · Revision 2016.10.11
2
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 connect/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 one or two record players
Connect left and right channels of the tonearm signal leads to the sockets marked
Phono1
or
Phono2
of the
phono amplifier. The earthing wire may be connected to the screw terminal (located above RCA sockets) if
you encounter hum problems when using the record player.
Line level input
A line level signal source can be connected to the preamplifier using
Line 3
socket on the back panel. This
signal can be converted to digital data using coaxial S/PDIF output or USB output.
!
!
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© Pro-Ject Audio Systems · Pro-Ject Phono Box DS2 USB · Revision 2016.10.11
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Connection to the amplifier
Connect the
Output
of the phono preamplifier 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 a DAC.
Connecting to a computer
Connect the
USB Out
of the unit to a free USB-socket on your computer and turn it on. Make sure the
computer is powered on.
* For Windows®operating systems an USB Class 2 driver (supplied on CD) has to be installed.
Mac OS®operating systems do not need an additional driver or setup.
Linux operating systems include an USB Audio Class 2 driver from Linux Kernel 2.6.35 and higher.
Please note: Connection should be made to an USB-socket of your computer directly. Connecting
to
USB-hubs or switches can cause problems.
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.
Remote power on - triggers
The phono amplifier can be switched on & off via a special connection from the other Pro-Ject products
equipped with trigger connections via the 2,5mm socket marked
Trigger IN
.
A 45cm long power-on cable (polarity ) is supplied for this purpose. Longer cables are available as
accessories. The remote power-on signal can be relayed to further units via the
Trigger OUT
socket.
Front panel controls
Stand-By
The button on the left hand side of the front panel 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.
+

© Pro-Ject Audio Systems · Pro-Ject Phono Box DS2 USB · Revision 2016.10.11
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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.
Loading Ω(input impedance)
The button
Loading Ω
sets the input impedance to desired value (low output MC cartridges: 10Ω-20Ω-50Ω-
100Ω-200Ω-1kΩor 47kΩfor 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
The push button selects the frequency of digital output signal. The selected frequency will be indicated by the
corresponding LED.
Subsonic
The push button turns on and off subsonic filter. The corresponding LED indicates the current status

© Pro-Ject Audio Systems · Pro-Ject Phono Box DS2 USB · Revision 2016.10.11
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Setting the record level
The record level knob on the front panel is used to set the level of the analogue signal going to the A/D
converter. A clipping LED indicates when the level is too high and the signal is distorted.
Technical specifications Pro-Ject Phono Box DS2 USB
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: 10, 20, 50, 100, 200ohms, 1000 ohms and 47kohms
A
Input capacitance/impedance: 47pF, 147pF, 267pF and 367pF */47kohms
B
Input gain: 40, 45, 50, 60, 65dB
Noise floor: 80dB (A weighted) at 40dB input gain
THD: <0,02%
RIAA-equalisation curve accuracy: 20Hz - 20kHz / max. 0,3dB
Subsonic filter: at 20Hz with 12dB/octave
Phono Inputs: 2 pairs RCA/phono sockets
Line input: 1 pair RCA/phono sockets
Line output: 1 pair RCA/phono sockets
Digital outputs: 1x USB B-type
1x S/PDIF coaxial
Outboard power supply: 18V/500mA DC, suitable for your country's mains supply
Power consumption: 100mA DC, <1W in standby
Dimensions W x D x H (D with sockets):206 x 227 (239) x 70,6 mm aluminium
240 x 227 (239) x 72 mm wood (including wooden side panels)
Weight: 1500g aluminium, 1780g wood (without any accessories)

© Pro-Ject Audio Systems · Pro-Ject Phono Box DS2 USB · Revision 2016.10.11
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Potential incorrect use and fault conditions
No signal on one or both channels:
No connection between record player and phono preamplifier 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, 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 ©2016. 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.