Art Project Series Manual de usuario
Precision Phono Pre
Low Noise Precision Phono Preamp
Project Series
User’s Manual
1
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
vibration when operating and storing. Avoid tobacco ash, drink
spillage and smoke, especially that associated with smoke
machines.
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.
2
INTRODUCTION
Thank you for purchasing Applied Research and Technology’s
Precision Phono Preamp, a high quality standalone phono
preamp. 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
cartridges without picking up noise or distortion that transform-
ers can exhibit.
Analog inputs are switchable between Moving Magnet and
Moving 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 9 VAC
supply 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 work-
station, home audio system, or monitor system, the DJ PRE II
gives you flawless audio reproduction in a rugged and reliable
package.
3
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 power supply for lower noise
Compact rugged extruded chassis designed for years of
use
Perfect for Connecting a phono cartridge to any audio
system
Designed and developed in the USA
4
The Facts About Turntable Preamps
Phonograph Records Have Three Basic Problems
1. It is physically impossible to press them with ridges that
allow low frequencies to come out at the same reproduc-
tion level as mid and high frequencies. Bass compensa-
tion 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 frequencies 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 sep-
arate 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.
5
INSTALLATION and OPERATION
Connect the AC adapter to the Power Input on the Precision
Phono Project Series and plug the other end into an AC power
outlet. Connect the turntable leads to the Input connectors on
the Precision phono Project Series.
If the turntable has a separate ground wire, attach it to the
Ground terminal on the DJPRE II 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 stereo RCA to dual mono ¼-inch male cable may be needed
to connect to the mixer line inputs.
6
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.
7
WARRANTY INFORMATION
Limited Warranty
Applied Research and Technology will provide warranty and
service for this unit in accordance with the following warrants:
Applied Research and Technology, (A R T) warrants to the
original 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, accompanied by proof of purchase
date in the form of a valid sales receipt.
Online Registration
We recommend that you register your product online to insure
prompt warranty repair servicing on any repair issues. Please
go to www.artproaudio.com. Select “Support”, then "Product
Registration". Then input your information here.
8
Exclusions
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
obligation to install the same on products previously manufac-
tured.
A R T shall not be liable for any consequential damages,
including without limitation damages resulting from loss of use.
Some states do not allow limitations of incidental or conse-
quential damages, 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
service
Fill in the following information for your reference:
Date of purchase ___________________
Purchased from ___________________
9
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
correctly, and the cables themselves are in working condi-
tion. You may want to consult with your dealer for assis-
tance in troubleshooting or testing your particular con-
figuration.
2. If you believe that the ART unit is at fault, go to
www.artproaudio.com.
3. Select “Support”, then “Return Authorization Request” to
request a return authorization number.
4. 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
consider 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.
5. Include, with your unit, a note with the RA number and
your contact information, including a return shipping ad-
dress (we cannot ship to a P.O. box) and a daytime phone
number, and a description of the problem, preferably at-
tached to the top of the unit. Also include a copy of your
purchase receipt.
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6
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