Biema A4173A PA Amplifier Stereo/Bridgeable 2x550W User Manual
- June 10, 2024
- Biema
Table of Contents
A4173A PA Amplifier Stereo/Bridgeable 2x550W
Product Information
The PA Amplifier Stereo/Bridgeable 2x550W is a commercial-grade audio amplifier designed for use in demanding audio applications. It can function as a stereo or high-power single channel amplifier and is suitable for use in pubs, clubs, cinemas, and multi-function venues. This new series, dubbed the Apple range, has been completely redesigned by Biema to offer vastly improved cooling, efficiency, and circuit protection. The amplifier features a variable speed cooling fan and ‘T’ shaped heatsink tunnel to ensure optimal performance even in demanding conditions. The AC mains power supply is rated at 220-230V 50Hz/60Hz.
Features
- Stereo/Bridgeable operation
- Cooling System: Two-step speed fan
- Mains Power Supply: AC: 220-230V 50Hz/60Hz
- Dimensions (mm): 482W x 430D x 88H
- Net Weight: 10.5kg
- Gross Weight: 12.5kg
Specifications
- Power Output: 2x550W
- AC Line Fuse, Thermal Cut
- Cooling System: Two Steps speed fan
- Mains Power Supply: AC: 220-230V 50Hz/60Hz
- Dimensions (mm): 482W x 430D x 88H
- Net Weight: 10.5kg
- Gross Weight: 12.5kg
Safety Instructions
- Read instructions before the product is connected and used.
- Retain instructions for future reference.
- Follow the warnings in instructions.
- Do not expose this appliance to heat sources such as radiators.
- The appliance should be placed so nothing interferes with its ventilation.
- This appliance should be connected to a power supply that’s suitable. Be sure to connect the appliance to a mains power socket which features a protective grounding connection.
- Caution: To reduce the risk of electric shock, do not remove any parts. No user-serviceable parts inside. Refer servicing to qualified service personnel only.
- WARNING: To reduce fire or electric shock, do not expose this appliance to rain and moisture. Electrical equipment should never be kept or stored in damp environments.
Product Usage Instructions
Step 1: Before use, carefully read and retain the instructions for future reference.
Step 2: Place the amplifier in a location where it will not be exposed to heat sources such as radiators and where nothing will interfere with its ventilation.
Step 3: Connect the amplifier to a power supply that’s suitable. Be sure to connect the amplifier to a mains power socket which features a protective grounding connection.
Step 4: Turn on the amplifier and adjust the volume to the desired level. The amplifier can function as a stereo or high-power single channel amplifier depending on your needs.
Step 5: After use, turn off the amplifier and disconnect it from the power supply.
Caution: Do not remove any parts of the amplifier as there are no user- serviceable parts inside. Refer servicing to qualified service personnel only.
Warning: Do not expose the amplifier to rain or moisture. Electrical equipment should never be kept or stored in damp environments.
Operating Instructions
This PA Amplifier is an effective solution for demanding commercial audio applications. This new series dubbed the “Apple” range have been completely redesigned by Biema to offer vastly improved cooling, efficiency and circuit protection. This range is designed to function as a stereo or high power single channel amplifier for use in foreground sound reinforcement ie: pubs, clubs, cinemas and multi-function venues. The variable speed cool-ing fan and ‘T’ shaped heatsink tunnel ensure the amplifier performs well even in demanding conditions.
Front Panel
-
Mains Switch
When you first press the switch, a soft start circuit will run to avoid a surge strike. In about 3-4 seconds there will be a click to indicate that the soft start has finished. 1-2 seconds later there will be another click to indicate the amplifier is connected. -
CH-1/CH-2 Input level control
Adjust the control to the desired volume. Only use the CH-1 control whilst amplifier is set in Bridge or Parallel mode. -
CH-1/CH-2 Protection indicating LED
The LED will light up red to indicate when the amplifier is running un-stable or has gone into thermal protection. -
Clip LED
This LED turns on just before the maximum output level of the amplifier has been reached. The clip LED’s may also turn on from time to time due to song selection however they shouldn’t stay lit for long periods of time. When this occurs we suggest you turn the output level down. -
Bridge mode indicating LED
When this LED lights, it indicates the amplifier is working under BRIDGE mode. The input signal only acts on CH-1. -
Parallel mode Indicating LED
When this LED lights, it indicates that the amplifier is working under PARALLEL mode. The input signal only acts on CH-1.
Rear Panel
-
CH-A/CH-B input XLR
Standard XLR jack, below is the input method Pin1: signal ground, Pin2: signal+, Pin3: signal- -
CH-A/CH-B 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. Pin1: signal ground, Pin2: signal+, Pin3: signal- -
CH-A/CH-B Output Mode Set Switch
Select the run mode as STEREO, BRIDGE or PARALLEL -
CH-A/CH-B Output SPEAKON
Standard speakon socket 1+2+: 1-2-: -
Mains Power Supply Cord
Features
- Rugged heavy duty construction
- 19” rack mount
- Bridgeable, parallel or two channel stereo operation
- Earth lift switch
- 3 pin XLR and 6.35mm inputs.
- Short circuit protection with indicator
- Overload protection with indicator
- Clipping prevention circuitry with indicator
- Variable speed fan forced cooling
- Muting circuit for switch on/off
Product Specifications
- Power: 2 x 550W 8Ω, 2 x 800W 4Ω
- Power (bridged): 1600W 8Ω
- Output Connections: SPEAKON
- Freq. response: 20Hz – 20kHz ±0.5dB
- Input sensitivity: 0.77V
- Input Impedance: 20k Ω/Balanced, 10k Ω/un-balanced S/N Ratio: ≥95dB
- THD: ≤0.03%
- Crosstalk @ Rated Output/8kΩ/1kHz: >70dB Damping Factor/8kΩ/1kHz: >240
- Slew Rate: 15V/uS
- Protection: Soft Start, Short Circuit, Limiter, DC Fault,
- AC Line Fuse, Thermal Cut
- Cooling System: Two Steps speed fan
- Mains Power Supply: AC: 220-230V 50Hz/60Hz Dimensions (mm): ≈ 482W x 430D x 88H
- Net Weight: 10.5kg
- Gross Weight: 12.5kg
Safety Instructions
- Read instructions before the product is connected and used.
- Retain Instructions for future reference
- Follow the warnings in instructions
- Do not expose this appliance to heat sources such as radiators
- The appliance should be placed so nothing interferes with its ventilation.
- This appliance should be connected to a power supply that’s suitable. Be sure to connect the appliance to a mains power socket which features a protective grounding connection.
Caution: To reduce the risk of electric shock, do not remove any parts.
No user serviceable parts inside. Refer servicing to qualified service
personnel only.
WARNING: To reduce fire or electric shock do not expose this appliance to
rain and moisture. Electrical equipment should never be kept or stored in damp
environments.
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