Art Project Series Manual de usuario

Precision Phono Pre

Low Noise Precision Phono Preamp

Project Series

User’s Manual

IMPORTANT SAFETY INSTRUCTION – READ FIRST

This symbol, whenever it appears alerts you to the presence

of uninsulated dangerous voltage inside the enclosure-

voltage that may be sufficient to constitute a risk of shock.

This symbol, whenever it appears, alerts you to important

operating and maintenance instructions in the

accompanying literature. Please read the manual.

Read Instructions: Retain safety and operating instructions for

future reference. Heed all warnings printed here and on the

equipment. Follow the operating instructions printed in this user

manual.

Do not open: There are no user serviceable parts inside. Refer

any service work to qualified technical personnel only.

Environment: Protect from excessive dirt, dust, heat, and vibra-

tion when operating and storing. Avoid tobacco ash, drink spill-

age and smoke, especially that associated with smoke ma-

chines.

Handling: Protect the controls from damage during transit. Use

adequate padding if you need to ship the unit. To avoid injury to

yourself or damage to the equipment, take care when lifting,

moving or carrying the unit.

Servicing: Refer servicing to qualified technical personnel.

Installation: Install the unit in accordance with the instructions

printed in the user manual.

INTRODUCTION

Thank you for purchasing Applied Research and Technology’s

Precision Phono Preamp, a high-quality standalone phono pre-

amp. The PPP interfaces Moving Coil (MC) and Moving Magnet

(MM) cartridges to a wide variety of audio systems. An

Extraordinarily low noise amplifier allows connection to MC car-

tridges without picking up noise or distortion that transformers

can exhibit.

Analog inputs are switchable between Moving Magnet and Mov-

ing Coil. The unit changes both the gain

and the cartridge loading to suit the selected cartridge. A rear

switch allows you to adjust MC cartridge loading between 100

Ohms and 25 Ohms. A low-cut filter removes rumble and low

frequency feedback while leaving the audio pristine.

The front gain trim control with the signal present/clip LED allows

you to optimize the output for a wide range of cartridges.

The Precision Phono PS is powered off an external 12V DC sup-

ply to provide low noise/ high headroom operation.

Upgrade your system in one quick and easy step.

The built-in low noise phono preamp circuitry is highly accurate

and precisely conforms to the RIAA standard. The line output

jacks are low impedance and can work with any audio system.

Housed in an aluminum-anodized case. If you need to amplify

and EQ your vinyl records to interface with an audio workstation,

home audio system, or monitor system, the DJ PRE II gives you

flawless audio reproduction in a rugged and reliable package.

FEATURES

High accuracy/low noise preamp

Moving Coil/Moving Magnet switchable input

Switchable low-cut rumble filter

Variable preamp gain

Signal present/clip indicator

Selectable Moving Coil loading

Gold plated RCA preamp outputs

External universal power supply for lower noise

Compact rugged extruded chassis designed for years of

use

Perfect for Connecting a phono cartridge to any audio sys-

tem

Designed and developed in the US

The Facts About Turntable Preamps

Phonograph Records Have Three Basic Problems

1. It is physically impossible to press them with ridges that al-

low low frequencies to come out at the same reproduction

level as mid and high frequencies. Bass compensation is

therefore needed during playback.

2. Records produce a certain amount of hiss, which is covered

up in post-production by boosting the gain of the high fre-

quencies before pressing. Counter-EQing during playback

compensates for this.

3. Magnetic cartridges produce a weak signal (typically

around 5mV), which must be boosted to match the rest of

the amplification, and this too is done during playback. In

the mid-1950s, the Recording Industry Association of

America established compensation standards. The result-

ing RIAA preamp has been built into every hi-fi and stereo

amplifier with phono or turntable inputs since then. A sepa-

rate RIAA preamp is necessary when you are connecting a

turntable to a mixer that does not have one built in.

4. Moving Coil cartridges typically have a low impedance and

very low output (0.2mV typically). Most will work with a load

between 24 and 100 Ohms. This load may be critical to the

sound of the cartridge.

5. There is a variant on Moving Coil called “high output” that

require a 47k load and have outputs in the 2mV range. The

Precision Phono Pre can accommodate this using the MM

setting and recovering 6-8dB of gain using the level control.

INSTALLATION and OPERATION

AC Power Hookup

The Precision Phono-PS has a universal external power supply

designed to operate at 100 to 240V AC ~ 50/60 Hz. Only use

the adapter that came with the Precision Phono-PS. If the

adapter becomes lost or damaged, contact ART Customer Ser-

vice for replacement. If you need to purchase one locally, please

specify 12V DC, at ≥ 800ma.

Setting up the Universal the power supply

Insert the correct clip adapter to the supply according to country

of operation. There are four different clips included. Please at-

tach the matching clip as per your AC power source.

Connect the power supply to the unit, labeled 12V DC .

Always make sure the output plug is securely plugged into the

rear of the Precision Phono-PS, and that the adapter is held

firmly in an electrical outlet. Never operate the Precision Phono-

PS or power adapter in the rain or in wet locations. lf the

adapter’s cord is ever cut, discontinue use and replace the

adapter with a new one. Unplug the adapter when the Precision

Phono-PS is not in use. Refer to the label on the adapter or the

specifications later in this manual for the appropriate power

specifications.

If the turntable has a separate ground wire, attach it to the

Ground terminal on the Precision Phono Pre to reduce hum.

Connect the RCA outputs to the appropriate inputs on your mixer

or stereo receiver (Line input, or an unused tape input). If the

mixer does not have RCA inputs (on any of the channels) a ste-

reo RCA to dual mono ¼-inch male cable may be needed to con-

nect to the mixer line inputs.

APPLICATIONS

Select the Cartridge setting

1. Select the correct mode using the switch (MC/MM). If you

have a high output MC cartridge that requires a 47k load,

choose MM mode.

2. If using MC mode, select the correct load (100 or 24

Ohms).

3. The Load switch only applies to the MC mode. You will

hear a slight difference between the two settings.

a. Start by using the manufacturer’s recommended

load. If you are not sure, select the 100 Ohm

setting. If the high end is exaggerated, the 24

Ohm setting will flatten the response out by

dampening the cartridge resonance.

4. You can adjust the level so you never see the Clip LED

light. There is plenty of dynamic range in the "green" por-

tion of the LED (18dB). In the event you do see the Red

LED just start to come on there is still 10-15dB of head-

room.

Low Cut Filter

The Filter switch, when in the Low-Cut position, adds a filter for

removing turntable rumble or other low frequency noise. The use

of the low-cut filter enables you to roll off deep bass to eliminate

turntable rumble and "skipping" in heavy feet traffic areas.

WARRANTY INFORMATION

Limited Warranty

Applied Research and Technology will provide warranty and ser-

vice for this unit in accordance with the following warrants:

Applied Research and Technology, (A R T) warrants to the orig-

inal purchaser that this product and the components thereof will

be free from defects in workmanship and materials for a period

of three years from the date of purchase. Applied Research and

Technology will, without charge, repair or replace, at its option,

defective product or component parts upon prepaid delivery to

the factory service department or authorized service center, ac-

companied by proof of purchase date in the form of a valid sales

receipt.

This warranty does not apply in the event of misuse or abuse of

the product or as a result of unauthorized alterations or repairs.

This warranty is void if the serial number is altered, defaced, or

removed.

A R T reserves the right to make changes in design or make

additions to or improvements upon this product without any obli-

gation to install the same on products previously manufactured.

A R T shall not be liable for any consequential damages, includ-

ing without limitation damages resulting from loss of use. Some

states do not allow limitations of incidental or consequential dam-

ages, so the above limitation or exclusion may not apply to you.

This warranty gives you specific rights and you may have other

rights, which vary from state to state.

For units purchased outside the United States, an authorized

distributor of Applied Research and Technology will provide ser-

vice

SERVICE

The following information is provided in the unlikely event that

your unit requires service.

1. Be sure that the unit is the cause of the problem. Check to

make sure the unit has power, all cables are connected cor-

rectly, and the cables themselves are in working condition.

You may want to consult with your dealer for assistance in

troubleshooting or testing your particular configuration.

2. If you believe that the ART unit is at fault, go to www.artpro-

audio.com.Select “Support”, then “Return Authorization Re-

quest” to request a return authorization number.

3. If you are returning the unit for service, pack the unit in its

original carton or a reasonable substitute. The original

packaging may not be suitable as a shipping carton, so con-

sider putting the packaged unit in another box for shipping.

Print the RA number clearly on the outside of the shipping

box. Print your return shipping address on the outside of

the box.

4. Include, with your unit, a note with the RA number and your

contact information, including a return shipping address (we

cannot ship to a P.O. box) and a daytime phone number,

and a description of the problem, preferably attached to the

top of the unit. Also include a copy of your purchase receipt.

Fill in the following information for your reference:

Date of purchase ___________________

Purchased from ___________________

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