Studiomaster Professional XPA 40 Instruction Manual
XPA 40
Professional Power Amplifier
0 10
CH A
0 10
CH B
XPA 40
POWER
Index
1...........................................................................................................................................................................................Warranty Information
2...........................................................................................................................................................................................................Introduction
3...........................................................................................................................................................................................Features at a Glance
4...........................................................................................................................................................................Front & Rear Panel Description
5..............................................................................................................................................................................................Wiring Information
6................................................................................................................................................................................... ..........System Application
7......................................................................................................................................................................................................Block Diagram
8...................................................................................................................................................................................Protections & Installations
9.................................................................................................................................................................................................Trouble Shooting
10.....................................................................................................................................................................................Technical Specifications
Explanation of Graphical Symbols
CAUTION
RISK 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 SERVICE PERSONNEL.
IMPORTANT SAFETY INSTRUCTIONS
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
enclosure that 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 the presence of important operating and maintenance
(servicing) instructions in the literature
accompanying the product.
WARNING
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE.
IMPORTANT NOTICE
Connecting the Plug and Cord
WARNING: THIS APPARATUS MUST BE EARTHED
IMPORTANT. The wires in this mains lead are coloured in accordance
with the following code:
GREEN-AND-YELLOW: EARTH
BLUE: NEUTRAL
BROWN: LIVE
As the colours of the wires in the mains lead of this apparatus may not
correspond with the coloured markings identifying the terminals in
your plug proceed as follows:
The wire which is coloured GREEN-and-YELLOW must be connected
to the terminal in the plug which is marked by the letter E or by the
safety earth symbol or colored GREEN or GREEN-and-YELLOW.
The wire which is coloured BLUE must be connected to the terminal
which is marked with the letter N or coloured BLACK.
The wire which is coloured BROWN must be connected to the terminal
which is marked with the letter L or coloured RED.
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 the point 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 spec ified by the manufacturer, or
sold with the apparatus.
When a cart is used, use cau tion 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 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.
Tips for Safe Operation
The 3 core AC mains cable should be terminated with this
AC mains plug by connecting brown/red wire on live pin
(L), black wire on neutral pin (N) and yellow/green wire
on earth pin (E).
The amplifier must be connected to an AC earthed mains
oultet that can delivered the maximum power required.
The use of extension cables or adaptors should be avoided
as this can jeoparadize correct delivery to the amplifier.
All connections must only be carried out or changed with
the amplifier switched OFF.
Ensure proper impedance matching while in use for BRIDGE
mode applications. For continous safe operation, resultant
impedance of the speakers 8 ohm/4 ohm is recommended.
For 2 ohm/4 ohm applications, it is recommended to use
speakon connectors only. Use of cable 40/36 or thicker is
recommended to prevent power losses.
The level of input signal should not exceed the specified
input sensitivities. Excessive input signal level result in
over driving of input circuit which leads to saturated /
distorted output at speaker terminals.
Do not operate the amplifier with continuously blinking
CLIP LED. The respective volume control of the channels
must be adjusted so that the output level does not clip and
distort.
Do not obstruct the front or back of the amplifier
for necessary intake of air.
2
Precautions
For safe operation
WARNING
Installation
Connect this unit’s power cord only to an AC outlet of the type
stated in this Owner’s Manual or as marked on the unit. Failure
to do so is a re and electrical shock hazard.
Do not allow water to enter this unit or allow the unit to become
wet. Fire or electrical shock may result.
Do not place a container with liquid or small metal objects on
top of this unit. Liquid or metal objects inside this unit are a re
and electrical shock hazard.
Do not place heavy objects, including this unit, on top of the
power cord. A damaged power cord is a re and electrical shock
hazard. In particular, be careful not to place heavy objects on a
power cord covered by a carpet.
Operation
Do not scratch, bend, twist, pull, or heat the power cord. A damaged power cord is a re and electrical shock hazard.
Do not remove the unit’s cover. You could receive an electrical
shock. If you think internal inspection, maintenance, or repair is
necessary, contact your dealer.
CAUTION
Do not modify the unit. Doing so is a re and electrical shock
hazard.
If lightning begins to occur, turn off the power switch of the unit
as soon as possible, and unplug the power cable from the electrical
outlet.
If there is a possibility of lightning, do not touch the power cable
plug if it is still connected. Doing so may be an electrical shock
hazard.
In case an abnormality occurs during operation
If the power cord is damaged (i.e., cut or a bare wire is exposed),
ask your dealer for a replacement. Using the unit with a damaged
power cord is a re and electrical shock hazard.
Should this unit be dropped or the cabinet be damaged, turn the
power switch off, remove the power plug from the AC outlet, and
contact your dealer. If you continue using the unit without heeding this instruction, re or electrical shock may result.
If you notice any abnormality, such as smoke, odor, or noise, or
if a foreign object or liquid gets inside the unit, turn it off immediately. Remove the power cord from the AC outlet. Consult your
dealer for repair. Using the unit in this condition is a re and
electrical shock hazard.
Installation
Keep this unit away from the following locations:
- Locations exposed to oil splashes or steam, such as near cooking stoves, humidiers, etc.
- Unstable surfaces, such as a wobbly table or slope.
- Locations exposed to excessive heat, such as inside a car with
all the windows closed, or places that receive direct sunlight.
- Locations subject to excessive humidity or dust accumulation.
Do not place the power cord close to a heater. It may melt, causing re or electrical shock.
Hold the power cord plug when disconnecting it from an AC outlet. Never pull the cord. A damaged power cord is a potential re
and electrical shock hazard.
Do not touch the power plug with wet hands. Doing so is a
potential electrical shock hazard.
This unit has ventilation holes at the front, rear & top to prevent
the internal temperature rising too high. Do not block them.
Blocked ventilation holes are a re hazard.
In particular, do not
- place the unit on its side or upside down,
- place the unit in any poorly-ventilated location such as a
bookcase or closet (other than on the dedicated rack),
- cover the unit with a table cloth or place it on a carpet or bed.
Allow enough free space around the unit for normal ventilation.
This should be: 5 cm at the sides, 10 cm behind, and 10 cm
above.
If the airow is not adequate, the unit will heat up inside and
may cause a re.
To mount several of these units in a standard EIA rack, refer to
the rack mounting instructions on page 16.
To relocate the unit, turn the power switch off, remove the power
plug from the AC outlet, and remove all connecting cables. Damaged cables may cause re or electrical shock.
Operation
Use only thick speaker cables when connecting speakers to amplifier outputs. Use of cables type 40/36 or thicker is recommended
for connecting low impedance speakers to avoid power loss in the
cables, as heavy current flows through the cables. Using other
types of cables is a fire hazard.
Turn off all musical instruments, audio equipment, and speakers
when connecting to this unit. Use the correct connecting cables
and connect as specied.
Always lower the volume control to minimum before turning on
the power to this unit. A sudden blast of sound may damage your
hearing.
Do not use this amplier for any purpose other than driving loudspeakers.
If you know you will not use this unit for a long period of time,
such as when going on vacation, remove the power plug from the
AC outlet. Leaving it connected is a potential re hazard.
When operating amplifier on a generator, make sure it is switched
“OFF” till generator voltages has stabilized & then only switch
“ON” amplifier.
Be sure of proper impedance of 2/4/8 ohm when used for
STEREO/PARALLEL configuration & 4/8 ohm recommended
when used in BRIDGE mode.
3
1. Warranty Information
Unpacking
As part of our quality control system, every Studiomaster Professional product is thoroughly inspected before leaving the factory to ensure
a flawless performance. After unpacking, please inspect the unit for any physical damages. In the event that a damage has occurred,
kindly notify your Studiomaster Professional dealer immediately. We request you to retain the packing/cartons should the product require
servicing/maintenance in the future.
2. Introduction
The Studiomaster Professional XPA series is a premium-grade high power stereo amplifier featuring an intuitive Thermal Management
System (TMS) that delivers unmatched sound, uninterrupted performance and optimal protection.
3. Features at a Glance
1. Professional-grade high-power stereo amplifier.
2. High-quality balanced XLR and ¼” Stereo Jack input connectors
3. 3 switchable operational modes: Stereo, Mono & Bridge
4. Intuitive Thermal Management System (TMS) for
temperature-controlled gain variation for optimal thermal
protection & uninterrupted sonic performance.
5. High-current toroidal transformers with high-endurance cores for
greater transient response and low-noise even at 2 Ohms.
6. Sensitivity (0.775V or 1.2V) selection switch allows flexibility in
connection of input sources.
7. Limiter switch to protect speakers from damage due to distorted
input signals.
8. 41-dented rotary volume control knobs.
9. Low THD & high damping factor for excellent sound quality.
10. High-quality glass epoxy, double-sided PTH PCBs and
high-grade components ensure reliability even in tough ambient
environs.
11. Intelligent cooling using low-noise variable speed fans & direct
mounted over-designed heat-sinks.
12. Built in protection against mains over voltage supply.
4. Front & Rear Panel Description
Front Panel
7 2
0 10
CH A
8
3 4 5 3 16
0 10
CH B
XPA 40
POWER
8
1 Master Switch
Switches the unit on and off.
2 Power ON Indicator Light
The Studiomaster Professional logo lights up when the amplifier is powered on.
3 Volume Control
This knob is used to adjust and control the volume and output level of the respective channel.
4 TMS (Thermal Management System)
This amplifier features an innovative temperature controlled gain variation technology called the Thermal Management System (TMS).
When the temperature at the heatsink reaches beyond the permissible limit, the TMS circuit intuitively reduces the gain proportionally
without any dropouts. This feature prevents the amplifier from going into thermal protection mode thereby ensuring a smooth and
uninterrupted sonic performance.
5 Mute Indicator
The Yellow LED lights up when the amplifier is in mute mode. This may occur due to the following reasons: switch on delay (3 seconds),
presence of a continuous voltage on the channel output, short circuit, thermal protection of the channel, or thermal protection of the
transformer.
6 Signal & Clip Indicator
These 4-segment Green LED lights show the output level of the amplifier. When the Clip LED turns Red, it means that the signal is
distorting/clipping. Kindly reduce the output level from the mixer or other connected devices to avoid any damages.
7 Bass/Boost Indicator
This Red LED lights up when the Bass/Boost Function is activated or is in use.
8 Air Intake Grill
This intake grill sucks in air to dissipate the heat generated and keep the amplifier cool.
For best results, do not obstruct the grill and clean the air filter whenever necessary.
4
Rear Plate
XPA 40
IS 616/IEC 60065
MADE IN INDIA
R - 71003344
9
SUB
LOW
OFF
CUT
120
63
43
180
FREQUENCY (Hz)
0.775V
SENSITIVITY
CHANNEL B
140
1.2V
WARRANTY VOIDS IF
SERIAL NO. IS MISSING
MONO
BASS/BOOST
OFF
STEREO
INPUT
ON
BRIDGE
For MONO or BRIDGE MODE use Input CHA.
SUB
OFF
120
63
43
FREQUENCY (Hz)
OFF ON
LIMITER
CHANNEL A
121110
Output Connections
ST & MO Mode
+1 = speaker +
GND
-1 = speaker -
OUTPUT
240V~/50Hz
30A, 6300W
LOW
CUT
140
180
BRIDGE
BR Mode CH A only
+1 = speaker +
+2 = speaker -
C
H
A
N
N
E
L
A
C
H
A
N
N
E
L
B
16A
MCB
PUSH TO RESET
4
7
312218
14
65
1 Balanced 6.3 mm Jack Input
This TRS stereo jack connector accepts an input signal (balanced/unbalanced) to drive the respective channel. If the signal is
unbalanced, kindly use a mono (TS) connector.
2 Balanced XLR Input
This XLR connector accepts an input signal (balanced/unbalanced) to drive the respective channel. If the signal is unbalanced, pin 2
can be used for the signal and pin 3 connected to the earth.
3 Output Binding Post
The binding post output is used to pick up the amplified signals individually in the stereo mode & in combination in the bridge mode.
4 Output Speakon Connector
Use this connector for picking up the amplified signal of CH 1 & CH2 and signal for bridged configuration.
5 Power Cable
This cable is used to supply the required power to the unit.
6 Circuit Breaker
The circuit breaker is provided to avoid amplifier failure caused due to a sudden surge or continuous high current supply.
7 Configuration Switch
This three-way switch is used to select between the three operational modes: mono, stereo and bridge.
8 Sensitivity
This switch is used to set the input sensitivity either at 0.775V or at 1.2V depending on the source.
9 Frequency Adjustment Knob
When the filter switch is at SUB or at the LOW CUT position, use this knob to adjust the frequency.
10 Filter Switch
Use this switch to select between the following two filter types.
SUBWOOFER: This is a low-pass filter. The amplifier reproduces frequencies that are lower than the cut-off set by the frequency adjustment knob.
LOW CUT: This is a high-pass filter. You can use this setting to filter out unneeded low or subsonic frequencies.
11 Bass Boost Switch
When you activate this mode, the amplifier adds low-frequency compensation to enhance the speaker's output.
Note: This switch is only effective when the FILTER switch is in the OFF position.
12 Limiter
Use this switch to activate or deactivate the built-in limiter. The limiter prevents distortion at the output level. When the output level
exceeds its maximum, an internal adjustment is made to prevent overloading. It is specially designed to protect the connected
speakers. When the amplifier is used to drive a subwoofer, switch the limiter off for added “punch”.
13 Air Exit Grill
Warm air exits from this grill to dissipate the heat generated and keep the amplifier cool.
For best results, do not obstruct the grill and clean the air filter whenever necessary.
14 External Earth Terminal
Use this for a ground/earthing connection if there are any humming problems.
5
5. Wiring Information.
XLR CONNECTOR STEREO JACK 6.3mm 1/4”
XLR CONNECTOR MONO JACK 6.3mm 1/4”
SPEAKON CONNECTOR
SPEAKON CONNECTOR
Negative Output
Positive Output
6
Loading...