Studiomaster SX225 User manual

Professional Power Amplifier
SX ENG V1
SX225
SX235

1
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
IMPORTANT SAFETY SYMBOLS
The symbol is used to indicate that some hazardous live terminals are involved
within this apparatus, even under the normal operating conditions, which maybe
sufficient to constitute the risk of electric shock or death.
The symbol is used in the service documentation to indicate that specific com-
ponent shall be replaced only by component specified in that documentation
for safety reasons.
Protective grounding terminal
Alternating current/voltage
Hazardous live terminal
ON: Denotes the apparatus is turned on
OFF: Denotes the apparatus is turned off.
WARNING: Describes precautions that should be observed to prevent the danger of
iInjury or death to the operator.
CAUTION: Describes precautions that should be observed to prevent danger of the
apparatus.
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1. IMPORTANT SAFETY INSTRUCTIONS
Read these instructions.
Keep these instructions.
Heed all warning.
Follow all instructions.
Water & Moisture
The apparatus should be protected from moisture and rain, can not used near
water, for example: near bathtub, kitchen sink or a swimming pool, etc.
Heat
The apparatus should be located away from the heat source such as radiators,
stoves or other appliances that produce heat.
800W 2
450W 2
1000W 2
580W 2
2000W
4 Ohms
8 Ohms
8 Ohms 1600W
10K Unbalanced 20K Balanced
0dB/0.775V
20Hz~20KHz 0.5dB
<0.1% (1KHz)
100dB(A weighted) 88(bandwidth)
300 @8 300 @8
70dB (1KHz) or 45dB (20-20KHz)
1200W 2 1500W 2
2 Ohms
4 Ohms 3000W2600W
220-240V AC 50Hz/60Hz
483 400 88.8mm(W D H)
12.5kg 13kg
F. TECHNICAL SPECIFICATIONS
Stereo mode
(dual channel)
1KHz
Bridge mono
1KHz
Damping coefficient
S/N ratio
THD(SMPTE-1)
Item
Frequency response
(below 10dB rated power)
Protection
Control
Input sensitivity
Input impedance
Crosstalk damping
DC protection, over drive/heat protection,
short-circuit protection, clip protection.
Indicator
Signal: 2 green LED
PEAK: 2 red LED
Power: 1 blue LED
Level: 2 green LED
Bridge: 1 yellow LED
Front panel: AC switch
Each channel volume knob
Rear panel:
1. stereo/bridge/parallel mode selecting switch
2. ground switch
3. Hi-pass selecting switch
Connector
Power supply
Dimension
Weight
Input: electric balanced COMBO,
1/4 inch TRS and terminal block.
Output: speak-on and binding posts.
12
SX235SX225
MODEL

Ventilation
Do not block ventilation areas. Failure to do so could result in fire. Always install
accordance with the manufacturer's instructions.
Object and Liquid Entry
Objects do not fall into and liquids are not spilled into the inside of the apparatus
for safety.
Power Cord and Plug
Protect the power cord from being walked on or pinched particularly atplugs,
convenience receptacles, and the point where they exit from the apparatus.
Do not defeat the safety purpose of the polarized or grounding-type plug.
Power Supply
The apparatus should be connected to the power supply only of the type as
marked on the apparatus or described in the manual. Failure to do so will result
in damage to theproduct and possibly to user.
Unplug this apparatus during lightning storms or when unused for long periods
of time.
Fuse
To prevent the risk of fire and damaging the unit, please use only the recommended
type of fuse as described in the manual. Before replacing the fuse, make sure the
unit is turned off and Type disconnected with AC outlet.
Electrical Connection
Improper electrical wiring may invalidate the product warranty.
Cleaning
Clean only with a dry cloth. Do not use any solvents such as benzol or alcohol.
Maintenance
Do not accept any servicing other than that described in the manual. Consult with
a qualified service personnel only.
Only use accessories or parts recommended by the munufacturer.
2
INPUT
LINK
E.R 30Hz-9dB LA DIF PWR AMP OUTPUT
CH A
CH A
1.15VRMS +4dB 15Kohm BALANCED
SUB WOOFER
(OPTION)
+/-
MODE
INPUT
LINK
E.B LA DIF PWR AMP OUTPUT
CH BCH B
AUTORAMP
TURN-ON CIRCUIT SHOCK DC OFFSET DC SERVO OVER TEMP SHORT CIRCUIT CURRENT LIMITER
TURN-ON/TURN-OFF
TRANSIENTS
BRIDGED PARALLEL
MONO
ACTIVE
CLIP
CH A CH B
AMP SIG
CH-A CH-B
OPTION
BINDING POST TERMINALS
AC PWR DETECTOR
PWR INDR
2-SPEED
¡Û
FANS
IN-RUSH CURRENT
POWER SWITCH
FUSE
AC POWER 120V/220V/230V /240V 50/60Hz (OPTION)
:XLR CONNECTOR :1/4" PHONE JACK :SPEAKON CONNECTOR
NOTICE
30Hz-9dB
SWITCH
POWER
E. BLOCK DIAGRAM
11

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11 12 13
9 8
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3
A. INTRODUCTION
Thanks for purchasing our this series professional power amplifier.
With many years amplifier R&D experience, the product adopts advanced professional
technology, which can guarantee its cost performance is higher than similar products
in market. The internal part of product adopts high effect software switch technology
that makes product be light and stable, and features multiple protect functions: clipping
& limiting protect, overdrive/overheat protect, HF protect and short-circuit protect etc.
apparatus is simple and elegant, operation is convenient and clear. Panel: power switch,
each channel (channel A/B) volume control knobs, clipping indicator, signal indicator,
power indicator and bridge indicator. Rear panel: combo/wiring terminal blocks/TRS
input socket, speak-on/binding-post output socket, parallel/bridge/stereo mode transfer
switch, limit transfer switch etc.
In order to have a good understand of product's features, please read carefully the
manual before operating the apparatus.
B. CONTROLS
Front/rear panel controls
1
1
2
2
3
3
+
SHIELD
INPUT FROM
SOURCE
1+
2-
2+
1-
CH A-
CH A+
1+
2-
2+
1-
CH A+
CH B+
1+
2-
2+
1- CH B-
CH B+
CH A Bridged CH B
1
1
2
2
3
3
+
INPUT FROM
SOURCE
SHIELD
CH A
CH A
+
PIN 1+
PIN 1-
How to connect bridge mode?
Under bridge mode, signals that input from CH A, can be output from CH A+ and
CH B+ or bridged output connector. Volume is controlled by volume knob of CH A.
In order to avoid crosstalk, please turn down CH B's volume to lowest. Please set
mode selecting switch to right position (BRIDGE) before bridge mode operating.
For further information, please refer to following diagram:
input connection hint
Balanced Unbalanced
BRIDGE
STEREO
PARALLEL
unavailable
unavailable
(solo channel)
10
1
2
3
4
7 7
6
5
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8. AC input socket
Connect standard 3PIN IEC power connector to main power system through
accessible power cable.
Please confirm if the voltage is correct before connecting power.
Note: to avoid shock or fire damages, please make sure amplifier and related
apparatus all connect to ground.
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1. power switch(ON/OFF)
Power switch, is used for turning on/off amplifier power. When turn on apparatus
power, power indicator illuminates.
Note: to avoid damaging your apparatus, please turn down volume before turning
on amplifier power.
2. peak indicator (PEAK)
Both Channel A and channel B feature a peak indicator. When input signal reach
or pass over peak level (signal distortion 0.5%), corresponding channel indicator
illuminates. Please adjust level control to avoid distortion.
3. bridge indicator (BRIDGE)
When bridges, indicator illuminates.
4. level indicator (-10dB, -20dB)
Indicates signal strength that inputs to power amplifier.
5. signal indicator(SIG)
Each channel feature a signal indicator, when output signal passes 500mV
(or input signal to input path ), indicator of corresponding channel illuminates.
6. power indicator (POWER)
When turn on apparatus power, the blue indicator illuminates.
7. volume control (CHA/CHB)
Both Channel A and channel B feature a volume control knob, turn the knob
to adjust input sensitivity of corresponding channel. The adjustable scope is:
- ~30dB. turn anti-clock to OFF position, at which can protect your loudspeaker
when turn on any system.
1
1
2
2
3
3
+
SHIELD
INPUT FROM
SOURCE
1+
2-
2+
1-
CH A-
CH A+
1+
2-
2+
1-
CH A+
CH B+
1+
2-
2+
1- CH B-
CH B+
CH A Bridged CH B
1
1
2
2
3
3
+
INPUT FROM
SOURCE
SHIELD
+
+
PIN 1+
PIN 1-
PIN 1+
PIN 1-
How to connect parallel mode?
Under parallel mode, signals that input to CH Aor CH B, can be output from
CH Aand CH B. Volume is controlled by volume knob of each channel.
Please set mode selecting switch to left position (PARALLEL) before parallel
mode operating. For further information, please refer to following diagram:
input connection hint
Unbalanced
Balanced
unavailable
CH A
CH A
CH B
BRIDGE
STEREO
PARALLEL
(solo channel)
9

10. Ground separating switch
ON means connecting apparatus ground with case, OFF means apparatus ground
isn't connecting with case(mainly used for decreasing noise when system allocates).
11. Hi pass selecting switch
Under ON state, can filter infrasonic wave below 30Hz, and protect bass unit effectively.
12. mode selecting switch
The switch supplies three operation modes, parallel, stereo and bridge.
Please select according to requirement.
1) Parallel mode:
Under the mode, there are one solo channel input, and two channels output; that is,
signals that input to CH A or CH B, can be output from CH A and CH B. Volume is
controlled by volume knob of each channel.
2) Stereo mode:
Under the mode, CH A and CH B operate separately. Signals that input from CH A,
outputs from CH A; Signals that input from CH B, outputs from CH B. Volume is
controlled by volume knob of each channel.
3) Bridge mode:
Under the mode, there are one solo channel input, and one solo channel output;
signal that inputs from CH A, and outputs from CH A+, CH B+ or bridge output
socket. The volume is controlled by CH A volume control knob. Turn down CH B
knob to lowest to avoid cross talk. Specific operation, please refer to chapter 4
of the manual.
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9. audio input/output connector
CHA and CHB electric balance COMBO (compliance XLR and 1/4"), terminal
block input connectors, used for connecting external audio signal.
These connectors internal parallel, can receive balanced and unbalanced audio
signal. The amplifier adopts low noise electric balanced circuit, wide dynamic
scope make it can receive signal of any audio level.
1
1
2
2
3
3
+
SHIELD
INPUT FROM
SOURCE
1+
2-
2+
1-
CH A-
CH A+
1+
2-
2+
1-
CH A+
CH B+
1+
2-
2+
1- CH B-
CH B+
CH A Bridged CH B
1
1
2
2
3
3
+
INPUT FROM
SOURCE
SHIELD
+
+
PIN 1+
PIN 1-
PIN 1+
PIN 1-
How to connect stereo mode?
Under stereo mode, CHA and CHB work separately, Signals that input from CHA,
outputs from CHA; Signals that input from CHB, outputs from CHB. Volume is
controlled by volume knob of each channel. Please set mode selecting switch to
the middle position (STEREO) before stereo mode operating.
For further information, please refer to following diagram:
input connection hint
Unbalanced
Balanced
CH B
CH A
CH A
CH B
unavailable
BRIDGE
STEREO
PARALLEL
(solo channel)
8

4) Turn off power after operating.
3) Adjust volume knob of amplifier to the best S/N ratio.
2) Turn on power switch of amplifier.
of speaker, two volume knobs should be turned to lowest before turning on
power amplifier.
volume knob sets on appropriate position. Usually, in order to avoid damaging
operation mode is correct;
all device connect to ground rightly;
AC voltage is correct;
1) Please confirm before connecting,
3) Power connection
Please check if voltage is correct, before connecting amplifier to power. Voltage
and fuss should be the same as indicated at rear panel. please use power cable
recommended by manufacture. It adopts standard IEC plug, which is qualified for
national ISM standard.
2) Audio connection
Power amplifier features COMBO, 1/4" TRS and terminal block input connection,
speaker-on as well as binding post output connector, which is convenient for
different connecting.
1) cabinet equipment
amplifier's height is 19" 2U, is suitable for standard cabinet equipment. In order to
avoid overheat, please make sure that power amplifier have enough room to cool
down, don't block ventilation.
6 7
14. fan
Fan can adjust speed automatically according to internal temperature.
Wind direction: front board rear board
13. audio output connector
Output connector of standard speak-on and biding post connector, which is used
for outputting audio signal amplified to external speaker. in order to avoid damage
of your device, please pay attention to impedance matching, don't make it is pay
attention to impedance matching, don't make it is lower than lowest impedance. LF: 1+ 1-
HF: 2+ 2-
1+
1-
2+
2-
SPEAKON
Tip
Ring
Sleeve
+
-
1/4" TRS JACK
XLR
1
2
31
2
3
1: GND 2: Hot (+) 3: Cold (-)
COMBO -XLR/JACK
12
3
XLR-F :
1: GND 2: Hot (+) 3: Cold (-)
TRS JACK
Tip/Ring/Sleeve
Wiring configuration
D. OPERATION
C. EQUIPMENT AND CONNECTION