Biema A4159 Amplifier Apple Series Owner’s Manual
- June 9, 2024
- Biema
Table of Contents
Biema A4159 Amplifier Apple Series
TECHNICALDATA&INTRODUCTION
OWNERS MANUAL
The information furnished in this manual does not include all of the details
of design, production, or variations of the equipment, Not does it cover every
possible situation that may arise during installation, operation or
maintenance. If you need special assistance beyond the scope of this manual,
please contact our Technical Support Group.
CAUTION
TO PREVENT ELECTRIC SHOCK 00 DOES NOT REMOVE THE COYER OR BACK. NO USER- SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL
MAGNETIC FIELD
CALITION Oo does not locate sensitive high-gain equipment such os a preamplifier or topa decks directly above or below lhe unit. Because this amplifier has a high power density, it has a strong magnetic field, which mn induce hum into unshielded devices shall are locally nearby. The field is strongest just above and below the unit. If an equipment rack is used, we recommend locating the amplifier (s) in the Iha bottom of the rock and Iha preamplifier or other sensitive equipment Ill the top.
WATCH FOR THESE SYMBOLS
- The lightning bolt triangle is used to alert the user to risk of electric shock
- The exclamation point triangle is used to alert the user to important operating or maintenance instructions.
WARNING
TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR
MOISTURE!
INTRODUCTION
BIEMA APPLE series amplifier represents a major step forward in Biema
power amplifier technology and design. In 1987 Mr. Biema collaborated with
professors at the Electro acoustics Research Center of Princeton University
and established Biema Acoustics R&D Center. Under his passion at music, Mr.
Biema has contributed most of his time and technology at the development of
Bema audio equipment. Biema professional amplifiers are coming with excellent
sound effects but at a very reasonable price. It offers a quality guarantee
and technological support for the apparatus you are using.
Quiet Operation
The high quality of the power transformers reduces external magnetic field
radiation, which can induce audible hum into associated equipment and cabling.
In addition, the up-to-date technology components are incorporated throughout
the design to ensure extremely low noise generation Biema all fore Series
power amplifiers.
DC Voltage protection
If an amplifier channel detects DC voltage at output terminals, the output
relay will immediately open to prevent loudspeaker damage. The protection LED
will light.
Reliable Power Supply
The Biema APPLE Series amplifiers have automatic power supply protection. The
power supply has experienced DC automatic regulation, which grants Bema APPLE
Series amplifiers excessive reliability. Biema APPLE amplifiers can be wired
for 115/230v 50Hz-60Hz AC power supply.
GENERAL
Biema’s new APPLE series amplifiers are high-performance and high-efficiency
top-quality amplifiers. To get good effecting of cooling and the highest work
efficiency, variable speed fan and T type heat-sink have been adopted for
constant cooling. Besides, APPLE series amplifiers have a comprehensive
protection function.
- Power ON/OFF transient, preventing the surge assault.
- Thermal cut-off protection, the amplifier will cut off the link with speakers when the temperature is more than 100°C.
- Short circuit current limited protection.
- The muting circuit prevents switching noise by turning the amplifier on or off.
- DC protection at speaker output, the amplifier will cut off the link with speakers when the amplifier is unusual.
- Limited protection, provides a voltage of compression without distortion, the amplifier will not clip.
PRECAUTIONS
- Don’t stack anything upon the amplifier.
- Always use a power source of adequate capacity.
- DO NOT turn ON/OFF the power of continuously. Never allow the ventilation holes on the front of the amplifier to be obstructed in any way.
- Input level adjust controls are provided on each channel.
- 0utput can use binding posts and squadron posts.
- When the amplifier works in stereo, bridge-mono or parallel-mono mode, the switch must be on the same.
- The fan’s variable speed may produce light noise, which is normal when the continuous output of large power and the amplifier gives out heat.
- To clean the amplifiers, wipe it wipe a dry cloth, if the case is very dirty, disconnect the AC cord form the power source and wipe it with a dry cloth. Never use solvents or chemical cloth. Never spray insecticides as they may cause discoloration or peeling.
- If any trouble is found, disconnect the power and contact your distributor.
MAJOR OPERATING CONTROLS AND THEIR FUNCTIONS
FRONT PANEL
-
MAINS POWER SWITCH
When pres1 the switch, the soft start circuit run for avoiding turge strilr.e. In about 3-4 seconds, there will be a clicking to denote that the soft start is finished. And more 1-2 seconds later, there will be another “Clicking”, the amplifier is connected to the speaker and ready to work. -
CH-1/CH-2 INPUT LEVEL CONTROL
Adjust It to get the volume desired. -
CH-1/CH-2 PROTECTION INDICATES LED
These LEDs will light up when the amplifier it running on-stable or went into thermal protection after the power elements temperature is over 90 “C. -
CH-1/CH-2 CLIP INDICATING LED
Turns on just before the maximum, distortion-free, output level of the amplifier. The clip LEDs may turn on shortly from time to time but they may certainly not turn on for longer periods. In this case, you have to turn the output level down! -
CB-l/CB-1 Signal Presence LED
Green LED, one per banned,Rasbe when the input signal exceeds -IIOdBu. -
CH-l/CB-1 POWEil LED Green LED,LED Illuminate• areen wben ampllfter la on.
REAR PANEL
-
CH-1/CH-2 inputXLR
standard XLR jack, below is the connection method; Pint: signal ground, Pin2: signal+, Pin3: signal- -
CH-1/CH-2 Signal Link Output
Standard XLR (male) socket for Input signal link, Its Pins are parallel connected with the female XLR socket so you can feed the same signal to another amplifier. Pini: signal ground, Pln2: signal+, Pln3: signal- -
Output Mode Set Switch.
Select the run mode as STEREO or BRIDGE or PARALLEL -
CHl/CH-2 SPEAKON post output
Used by a standard SPEAKON connector. -
CH1/CH-2Binding_post output
Used by a standard Binding post connector. -
Mains Power Supply Cord
Manufacturer: WIND FORCE ELECTRONIC MANUFACTURING CO., LTD TEm
- Guangzhou Wind Force Electronic Manufacturing Co.,Ltd
- Building 1, Lifeng Industrial Zone, Zhongsheng Road, Zhongcun Town, Panyu District, Guangzhou, China
- P.C. 511495
- Tel: 020-66606029 FAX: 020-66618678 Sieme
- E-mail: windforce@biema.com service@biema.com Biema
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