Boston Acoustics PA400 User manual

Boston Acoustics PA 400
Power Amplier
User Manual
bostonacousticspro.com bostonacousticspro.vn

Boston Acoustics PA 400
User Manual
This is a detailed guide on how to use the PA Series Power Ampliers from Boston Acoustics. Be sure to
read and follow these instructions for optimal product use
Keep this document for reference when needed. Find more information about this product at:
www.anhduy.vn and www.anhduyaudio.com
The Boston Acoustic PA Series Power Amplier is a 2-channel power amplier designed with new
high-performance Class AB circuitry. With the ability to process audio signals optimally and exibly with
many modern professional sound systems, this is the ideal choice for closed entertainment spaces and
outdoor stages.
1. The product operates at a high power and has a strong magnetic eld that easily interferes with other
devices nearby. Therefore, you should not place devices with high sensitivity such as signal processors,
music player underneath the power amplier. If you use a shelving cabinet, you should place the prod-
uct on the bottom shelf.
2. Please use a power outlet with a suitable capacity for the power amplier.
3. Do not turn the device on or o continuously, it will cause electric shock and damage the product.
4. The input signal sensitivity is adjusted independently for the 2 channels.
5. When connecting the Power amplier to the speaker and mixer, you should use the best jack and lead
possible to ensure the sound quality and stable operation.
6. When using the Power amplier at high power continuously, you may hear the cooling fan inside the
system but it should be quiet enough to not cause any disturbance. This is how the device typically
operates.
7. You must unplug the device when cleaning. Use only clean, soft, cloths that are not too damp. Do not
use cleaners or corrosive chemicals to clean the product
INTRODUCTION
PERCAUTIONS
1

2
FRONT PANEL DETAILS
BACK PANEL DETAILS
1. POWER: Power on/o switch. When this button is turned on, the device protection circuit will turn on
after about 1-2 seconds and will connect the power source to the amplier circuit. 3-4 seconds after,
the protection circuit will connect from amplier output port to the speaker. Then, the POWER light will
light up green, indicating that the device is operating normally.
2. -20dB, -10dB, 0dB: Indicates the device volume level is active.
3. CLIP: When the output signal reaches the limit of the device, this light will light up. If the CLIP light
is on continuously while there is an input signal but there is no signal to the speaker, the system
connecting the speaker cable has short-circuited, in this case turn o the power to inspect the device.
4. PRO (PROTECT): These lights show the operating status of the protection circuit. If the device has a
problem, the light will turn Red
5. VOLUME (CH A / CH B): 2-channel volume control knobs
1. FAN: Ventilation fan helps to cool the device. The rotation speed of the fan changes as the internal
temperature rises
2. FUSE: the fuse automatically disconnects the power supply to the device when a short circuit happens
or an operation exceeds the permissible level.
3. INPUT:
•CH 1 signal input for the left audio channel for XLR or RCA cables
•CH 2 signal inputs for the right audio channel for XLR or RCA cables
4. DIRECT OUT: Directly outputs 2-channel audio signals from source to another power amplier using
the XLR cable.
5. INPUT MODES:
•STEREO: Select this mode for 2 live audio outputs that will operate with 2 dierent audio signal inputs.
•PARALLEL: Select this mode for 2 live audio outputs that will operate with the same audio signal
input.
6. 2-channel speaker ports that connects to a conventional speaker using a banana jack, a pincer or a
bare wires, CH 1 is for the left speaker channel, CH 2 is for the right speaker channel, the red port is the
positive node (+) and the black port negative (-)
7. 2-channel speaker ports for connecting a dedicated speaker using Speakon jack head, the CH1 port
is for left channel speaker and the CH2 port is for right speaker channel
8. Power cord socket
1
2 5
3 4
123 4 5 6
7 8

3
SPECIFICATIONS
Model PA400
Wattage RMS (8 Ohms) 400W / channel
Wattage RMS (4 Ohms) 700 / channel
Frequency response 20-20KHz(+-1.5)
THD < 0.05
Signal to Noise Ratio > 90dB
Damping Factor > 800db(100hz)
Crosstalk >60dB
Slew Rate 10V/us
Input sensitivity 0.775V/1.0V/1.v
Net weight 12kg