P-3T

User Guide

PREAMPLIFIER

Table of Contents
Safety Precautions................................................................................................3
Front Panel Names and Functions.......................................................................6
Rear Panel Names and Functions........................................................................8
Remote Control Button Names and Functions...................................................10
Remote Control................................................................................................... 11
DISPLAY button..................................................................................................12
Power Cable Connection....................................................................................12
Balanced Input/Output........................................................................................12
Attaching the Spike Pins.....................................................................................12
Troubleshooting..................................................................................................13
Maintenance.......................................................................................................13
Specifications......................................................................................................14

Supplied Accessories• User Guide (this manual)........................... 1• Spike pin.................................................... 3• Power cable............................................... 1• Remote control........................................... 1• Spike-receiving board ............................... 1

2

Safety Precautions

CAUTIONRISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK).
NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICEPERSONNEL.

The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert
the user to the presence of uninsulated “dangerous voltage” within the product’s enclosurethat may be of sufﬁcient magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to alert the user to thepresence of important operating and maintenance (servicing) instructions in the literatureaccompanying the product.

WARNINGTO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO
RAIN OR MOISTURE.

A warning that an apparatus with CLASS I construction shall be connected to a MAINS socket outlet with aprotective earthing connection.

3

IMPORTANT SAFETY INSTRUCTIONSREAD BEFORE OPERATING EQUIPMENT

This product was designed and manufactured to meet strict quality and safety standards.
There are, however, some installation and operation precautions which you should be particularly aware of.
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings.
Install in accordance with the manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including
amplifiers) that produce heat.
9. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and thepoint where they exit from the apparatus.
10. Only use attachments/accessories specified by the manufacturer.
11. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, orsold with the apparatus. When a cart is used, use caution when moving the cart/apparatus
combination to avoid injury from tip-over.
12. Unplug this apparatus during lightning storms or when unused for long periods of time.
13. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged
in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into
the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been
dropped.
14. Batteries shall not be exposed to excessive heat such as sunshine, fire or the like.

CAUTION:•

To completely disconnect this product from the mains, disconnect the plug from the wall socket outlet.
The mains plug is used to completely interrupt the power supply to the unit and must be within easy
access by the user.

•

Never use the unit with any other cord except the supplied power cord.

NOTE ON USE
WARNINGS• Avoid high temperatures.
Allow for sufficient heat dispersion when installed in a rack.
• Handle the power cord carefully.
Hold the plug when unplugging the cord.
• Keep the unit free from moisture, water, and dust.
• Unplug the power cord when not using the unit for long periods of time.
• Do not obstruct the ventilation holes.
• Do not let foreign objects into the unit.
• Do not let insecticides, benzene, and thinner come in contact with the unit.
• Never disassemble or modify the unit in any way.
• Ventilation should not be impeded by covering the ventilation openings with items, such as newspapers, tablecloths or curtains.
• Naked flame sources such as lighted candles should not be placed on the unit.
• Observe and follow local regulations regarding battery disposal.
• Do not expose the unit to dripping or splashing fluids.
• Do not place objects filled with liquids, such as vases, on the unit.
• Do not handle the mains cord with wet hands.
• When the switch is in the OFF position, the equipment is not completely switched off from MAINS.
• The equipment shall be installed near the power supply so that the power supply is easily accessible.

4

DECLARATION OF CONFORMITY
We declare under our sole responsibility that this product, to which this declaration relates, is in conformity with the following
standards:
EN60065, EN55032, EN55020.
Following the provisions of Low Voltage Directive 2014/35/EU and EMC Directive 2014/30/EU.

A NOTE ABOUT RECYCLING:
This product’s packaging materials are recyclable and can be reused. Please dispose of any materials
in accordance with the local recycling regulations. When discarding the unit, comply with local rules orregulations.
Batteries should never be thrown away or incinerated but disposed of in accordance with the local
regulations concerning battery disposal. This product and the supplied accessories, excluding the batteries,
constitute the applicable product according to the WEEE directive.

CAUTIONS ON INSTALLATION

Wall
Wand
Paroi
Parete***** For proper heat dispersal, do not install this unit in a confined space, such as a bookcase orsimilar enclosure.
• Leave sufficient clearance (at least 10 cm) from the wall, (at least 5 cm) from top surface of the unit.
• Do not place any other equipment on this unit.

5Front Panel Names and Functions
e r

q

w

q Power Switch (POWER)
Press to turn on the power, and press again to turnoff. For about 6 seconds after turning on the power,
no sound is output and only the Power Indicator is lit.

w Power Indicator (POWER)
While the power is turned on, the indicator is lit.
Notes:• Master mode: While in GND separation mode, theindicator is lit blue. While in GND connection mode,
the indicator is lit red.
• Slave mode: While in GND separation mode, theindicator is lit light-blue. While in GND connectionmode, the indicator is lit yellow.

e Output Selection Switch (OUTPUT)
Pressing the switch toggles between balanced output
and unbalanced output.
Note:• Balanced output and unbalanced output cannot be
performed simultaneously.

r Output Indicators (BAL/UNBAL)
The selected output is lit.

Phase settings for balanced output and
Output Indicator colors• The absolute phase can be reversed with the
PROGRAM button on the remote control.
• The indicator is lit red while the phase is positive, andthe indicator is lit yellow while the phase is negative.
• The phase (positive/negative) can be set for eachselected input, and the setting is retained evenafter the power is turned off.

6

■ When the pin 2 = HOT is used for the device
connected to the output terminals
・When the balanced terminal, pin 2 = HOT is used forthe selected input device
Set the indicator to red by using the PROGRAM
button on the remote control.
・When the balanced terminal, pin 3 = HOT is used forthe selected input device
Set the indicator to yellow by using the PROGRAM
button on the remote control.
・When the unbalanced terminal is used for the selected
input device
Set the indicator to red by using the PROGRAM
button on the remote control.
■ When the pin 3 = HOT is used for the device
connected to the output terminals
・When the balanced terminal, pin 2 = HOT is used forthe selected input device
Set the indicator to yellow by using the PROGRAM
button on the remote control.
・When the balanced terminal, pin 3 = HOT is used forthe selected input device
Set the indicator to red by using the PROGRAM
button on the remote control.
・When the unbalanced terminal is used for the selected
input device
Set the indicator to yellow by using the PROGRAM
button on the remote control.
Device connected to the output terminals
pin 2 = HOT
pin 3 = HOT
Devicepin 2 = HOT Red (positive phase) Yellow (negative phase)connected pin 3 = HOT Yellow (negative phase) Red (positive phase)to the input
terminals Unbalanced Red (positive phase) Yellow (negative phase)

y

i

Q1 Q0

t

u

o

⑤ Balanced Input Selection Button(BAL INPUT)
Press repeatedly to select a desired balanced input.

y Balanced Input Selection Indicator(1/2/3/4)
The selected input is lit red.
Notes:• While the Balanced 4 Bypass Switch is on, Balanced
Input 4 is lit light-blue.
• While Balanced 4 is selected, the indicator is lit palered.

u Unbalanced Input Selection Button(UNBAL INPUT)
Press repeatedly to select a desired unbalanced input.

o Volume Adjustment Dial
Adjust the volume. Turn the dial clockwise to increase
the volume. Even after the power is turned off, the lastused volume setting made with the dial remains in thememory.
Note:• If the volume setting remaining in the memory is-20dB or higher, the volume will be -20dB when the
power is turned on again.

Q0 Volume Display
Displays the volume in the unit of dB. The maximum
volume is displayed as “-0.0” and the minimum volume(-∞) is displayed as “---”.

Q1 IR Sensor
Receives infrared signals from the remote control.

i Unbalanced Input Selection
Indicator (1/2/3/4)
The selected input is lit red.
Notes:• While the Unbalanced 4 Bypass Switch is on,
Unbalanced Input 4 is lit light-blue.
• While Unbalanced 4 is selected, the indicator is lit
pale-red.

7

Rear Panel Names and Functions
d f

a

a

g

s

s

a Audio Input Terminals (INPUT)
Use these terminals to input analog audio signals.
Note:• When connecting a connector cable, turn off thepower or set the volume to the minimum (---).

s Pre-Out Terminals
Use these terminals to output pre-out audio signals.
Notes:• The 3 types of balanced output are parallelly connected
and the signals are output simultaneously.
• Balanced output and unbalanced output cannot be
performed simultaneously.

d UART Input Terminal (UART INPUT)
Use this input terminal for control signals when using
multiple units of this product.
When in slave mode, connect a 3.5Φ stereo mini plug
cable (sold separately) to this terminal.

Cautions when using the UART communication
function•W hile plugging/unplugging the communication cableor switching between master and slave mode, besure to keep the power off.
•D
 o not leave the communication cable with only one
end of the cable connected to this product.
•D o not touch both ends of the communication cable.
• When turning on the power, first turn on the slave
units.
•W hen turning off the power, first turn off the master
unit.

8

f Mode Change Switch(MASTER/SLAVE)
When using multiple units of this product, use thisswitch to select Master or Slave.
Notes:• While in slave mode, the Power Indicator is lit lightblue or yellow.
• While in slave mode, the setting is configured basedon that of the master.
• While in slave mode, the difference in value withthe master can be set by adjusting the volume whilepressing the Output Selection Switch (OUTPUT).
The same difference in volume value with the masteris retained even after the power is turned off.

Display example

When the difference with the master is set to -6dB,

is displayed.

g UART Output Terminal(UART OUTPUT)
Use this output terminal for control signals when using
multiple units of this product. When in master mode,connect a 3.5Φ stereo mini plug cable (sold separately)to this terminal.
Using this output terminal allows you to connect 3 ormore units with a stack connection.

h j

k

l

h Balanced 4 Bypass Switch(BAL 4 BYPASS)

k GND Switch(SEPARATION/CONNECTION)

While balanced 4 is selected, the same level as the
input is output regardless of the volume setting. Use
this switch such as when connecting an AV preamplifier.
While bypass is set to on, Balanced Input Selection
Indicator 4 is lit light-blue.

This switch connects separated right and left analog
GND to the main chassis.
SEPARATION:
Separates the right and left analog GND from themain chassis. To obtain better audio quality, keep
the switch in this position.
CONNECTION:
Connects analog GND to the main chassis. Whennoise or the like occurs, set the switch to this position.

Note:• While a device such as a CD player is connected,
always keep bypass set to off.

j Unbalanced 4 Bypass Switch(UNBAL 4 BYPASS)
While unbalanced 4 is selected, the same level as the
input is output regardless of the volume setting. Use
this switch such as when connecting an AV preamplifier.
While bypass is set to on, Unbalanced Input Selection
Indicator 4 is lit light-blue.
Note:• While a device such as a CD player is connected,
always keep bypass set to off.

l AC Inlet (AC115V)
Connect to a 115 V AC wall outlet (mains). Using the
supplied power cable is recommended to obtain better
audio quality.
Notes:• Connect the side with OO engraved to the groundside (with a longer hole).
• The aluminum base of the AC inlet is not secured inorder to obtain better audio quality.

9Remote Control Button Names and Functions

The grayedout portions are not
網掛けの部分は本製品ではavailableonthis device.
対応していません。

q

r

w

t

e

q VOLUME Button

Note:

Press to adjust the volume. Each time you press the
button, the volume increases/decreases in the incrementof 0.5dB. Press and hold the button to continuously
increase/decrease the volume.

• Refer to “r Output Indicators (BAL/UNBAL)”.

Notes:• When increasing the volume, you cannot continuously
increase the volume if the volume level is -20dB orhigher.
• When decreasing the volume, you can continuously
decrease the volume regardless of the volume level.

w MUTE Button
Press to mute the sound and press again to cancel
mute.
While muted, the Volume Display flashes.

e PROGRAM Button
Press to set the balanced output phase corresponding
to the currently selected input.

10

r INPUT SELECT Button
Press to select a desired input.
BAL1 →→→ BAL4 → UNBAL1 →→→ UNBAL4 →BAL1…

t DISPLAY button
Press to turn off the indicators and the display andpress again to turn on.
Notes:• While the indicators and the display are off, pressing
any button first causes the indicators and the display
to turn on. After doing so, any desired operation canbe performed.
If any operation is not performed for about 2 seconds,
the indicators and the display automatically turn off.
• The Power Indicator does not turn off.

Remote Control
n Notes on Operationn How to Change the Batteries
Remove the lid on the rear side of the remote control
and insert 2 AAA (LR03/R03) batteries as indicatedinside the battery compartment. After inserting thebatteries, attach the cover again.

Approx. 5m

60˚
Remote control
Operate the remote control within approx. 5 m distancefrom the front panel of the main unit within an angle of
60°to the remote sensor.
• Prevent the remote sensor from being exposed tostrong light.
• Do not place any obstacles between the remotecontrol and the remote sensor.
• Do not use other remote controls while using the
remote control for the main unit.

Cautions on Batteries• Use AAA (LR03/R03) batteries for the remote control.
• Replace the remote control batteries with new ones
after approx. 1 year has passed.
• If you cannot operate the main unit by using the
remote control at a short distance from the main unit,change the batteries with new ones even if 1 year
has not yet passed.
• Insert batteries with the correct polarity as indicatedby the “+” and “–” symbols inside the battery
compartment.
• Do not use old and new batteries at the same time.
Doing so may cause battery leakage or rupture.
Furthermore, do not use different types of batteries
together.
• Do not short-circuit, disassemble, or heat batteries.
Do not throw batteries into a fire.
• When not using the remote control for a long periodof time, remove the batteries.
• If battery leakage occurs, wipe the battery liquidfrom the battery compartment and then insert newbatteries.
• When disposing of batteries, follow appropriate local
guidelines and regulations such as ordinances.

11

DISPLAY button

Attaching the Spike Pins

The display and indicators other than the power indicator
can be turned off by pressing the DISPLAY button on the
remote control.
Turning off the display can reduce noise inside the unit
thereby improving the audio signal quality.

 y replacing the feet with the supplied spike pins,B
you can tune the audio quality. Point grounding makes
the sound focus and auditory lateralization sharper.
Furthermore, the audio quality can be subtly tuned
by changing the material of the surface on which thisequipment is installed.

Power Cable Connection
When you connect the power cable, be sure to insert
the ground-mark side (the side with 2 engraved circles)of the plug into the ground side (the side with a longer
insertion hole) of the AC wall outlet (mains). If the plug
is connected with the polarity reversed, this product may
not be able to deliver its utmost performance.
Short

Long
Ground sideNote:
• When the spike pins are attached, it may be difficult
to keep weight balance stable. Take great care not tocarelessly apply a force on the corners of the main unit.

Note: Before connecting, be sureto turn off the power switch.

Ground marks

Balanced Input/Output

The feet can also be attached to the back-side holes.
If the front side of the device is not stable, attach thefeet to the back-side holes.

The XLR Connector is used for Balanced Input/Output.
There are two types of connection, “European Type”
and “USA Type”.
1. European Type (adapter for this unit)(pin 2 = HOT, pin 3 = COLD)
HOT
HOT

2

1

GND

3
GND
2 COLD
1
INPUT
3
COLD
INPUT

GND
GND

1

HOT

3
HOT
1 COLD2
OUTPUT
3COLD
OUTPUT

2. USA TypeGND
GND3 = HOT)
(pin COLD
2 = COLD,
pin
2
1
1

12

2

2

COLD

3
COLD
GND
2 HOT
1
INPUT
3
HOT

3
GND
COLD
1 HOT
2
OUTPUT
3
HOT

INPUT

OUTPUT

Cautions• When using the spike pins, be extremely careful
not to get injured, etc.
• When using the spike pins, be careful that thesurface on which the main unit is installed suchas the surface of a table, shelf, etc., may become
damaged.Using the spike-receiving board ishighly recommended in order to protect the
installation surface.

Troubleshooting

MaintenanceNo sound is output.
• Check that the power of the main unit is on.
• Check that the appropriate input source isselected.
• Check that the Output Selection Switch is set
properly.
• Check that the Mode Change Switch is set
properly.
• Check the connections of the external devices.
• Check that the power of the external devices is on.
• Check that the operations and settings on theexternal devices are correct.
• Check the connections of the speaker system.

When the unit has become dirty, wipe it clean usinga soft cloth. To remove stubborn stains, dilute somedish-washing liquid in 5 or 6 times as much water,
soak a soft cloth in the solution, wring it out well, wipeaway the stains, and then wipe the surfaces dry witha dry cloth.
Never use alcohol, paint thinners, benzine, insecticides
or other volatile substances since they may mar or
remove the surface gloss.
Bear in mind that rubbing surfaces with a chemicalcleaning cloth or leaving such a cloth in contact with asurface for an extended time may result in deterioration.

The remote control does not operate.
• Check that the remote control batteries are notworn out.
• Check that the distance between the remotecontrol and the main unit is not too far or that there
is no obstacle between the remote control and themain unit.
• Keep the tip of the remote control facing the IR
Sensor (Volume Display).

13

Specifications
AInput............................................ XLR x 4, RCA x 4
Output............................................ XLR x 3, RCA x 1(selectable XLR or RCA )Total harmonic distortion........... 0.0015% (1.5 Vrms)
Frequency characteristic......2 Hz to 1 MHz (±3.0dB)
Residual noise.......................... 13μV (20 kHz L.P.F.)
Maximum output........................................... 21 Vrms
Output impedance...................................... 6.8 ohms
Maximum gain................................................... 11dB
Power voltage..................................115 V AC, 60 Hz
Power consumption...........................................20 W
Maximum external dimensions.................454 mm (W) x 174 mm (H) x 430 mm (D)Weight.............................................................. 25 kg

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CSR International Ltd.

Printed in Japan

02/2021 28BA851170 TM