Pro-Ject Audio Systems Phono Box DS User manual

INSTRUCTIONS FOR USE

Pro-Ject Phono Box DS

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 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

Out

Right Left

Out

18V

Subsonic

OFF

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 "socket of the phono amplifier before

connecting the power supply to the mains.

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.

Settings

The three push buttons on the left hand side are used to set input impedance, input capacitance and input gain.

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.

Phono Box DS

Ohm

10 100 1000

100 220 320

40 50 60

Input impedance / ohms

Input capacitance / pF

Input gain / dB

Ohm - all LEDs off = 47kohms.

pF - all LEDs off = 47pF.

LEDs pF 100, 220 and 320 - readout always + 47pF

After disconnecting the unit from the mains, all settings will be deleted.

Examples of typical settings

Ortofon 2M Red (MM)

Input impedance 47kohms

Input capacitance 147pF

Input gain 40dB

Ohm 10 100 1000

pF 100 220 320

dB 40 50 60

all LEDs off = 47pF

readout + 47pF

Ortofon X5-MC (High-Output MC)

Input impedance 47kohms

Input capacitance 367pF

Input gain 40dB

Ohm 10 100 1000

pF 100 220 320

dB 40 50 60

all LEDs off = 47pF

readout + 47pF

Ortofon Rondo Red (Low-Output MC)

Input impedance 10ohms

Input capacitance (pF) *

Input gain 60dB

Ohm 10 100 1000

pF 100 220 320

dB 40 50 60

* Any setting.

Input capacitance is irrelevant for

low-output MC cartridges

Subsonic filter

Subsonic

OFF

A switch at the back of the phono amplifier activates and deactivates the subsonic filter.

Technical specifications Pro-Ject Phono Box DS

ATypical for low output MC cartridges, Btypical for MM or high output MC cartridges

* Input capacitance is irrelevant for low-output MC cartridges

Input impedance: 10ohms, 100ohms, 1kohm A

Input capacitance/impedance: 47pF, 147pF, 267pF and 367pF */47kohms B

Input gain: 40 B / 50 and 60dB A

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

Input: 1 pair RCA/phono sockets

Line-level output: 1 pair RCA/phono sockets

Outboard power supply: 18V/500mA DC, suitable for your country's mains supply

Power consumption: 100mA DC, <1W in standby

Dimensions W x H x D (D with sockets): 103 x 72 x 144 (156)mm

Weight: 1.100g without power supply

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.

Service

Should you encounter a problem which you are not able to alleviate or identify despite the above information,

please contact your dealer for further advice. Only when the problem cannot be resolved there should the

unit 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 change to any part of the product by unauthorized persons release the

manufacturer from any liability over and above the lawful rights of the customer.

PRO-JECT is a Registered Trademark of H. Lichtenegger.

This guide was produced by: Audio Trade GmbH

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.

This manual suits for next models

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