SHOW A500.4 Switching Power Professional Amplifier User Manual
- June 5, 2024
- SHOW
Table of Contents
SHOW A500.4 Switching Power Professional Amplifier
Important Safety Instructions
This symbol, wherever used, alerts you to the presence of un-insulated and
dangerous voltages within the product enclosure. These are voltages that may
be sufficient to constitute the risk of electric shock or death.
This symbol, wherever used, alerts you to important operating and maintenance
instructions.
POWER SUPPLY
Ensure that the insource voltage (AC outlet) matches the voltage rating of the
product. Failure to do so could result in damage to the product and possibly
the user. Unplug the product before electrical storms occur and when unused
for long periods of time to reduce the risk of electric shock or fire.
EXTERNAL CONNECTION
Always use proper ready-made insulated mains cabling (power cord). Failure to
do so could result in shock/death or fire. If in doubt, seek advice from a
registered electrician.
DO NOT REMOVE ANY COVERS
Within the product are areas where high voltages may present. To reduce the
risk of electric shock do not remove any covers unless the AC mains power cord
is removed. Covers should be removed by qualified service personnel only. No
user serviceable parts inside.
FUSE
To prevent fire and damage to the product, use only the recommended fuse type
as indicated in this manual. Do not short-circuit the fuse holder. Before
replacing the fuse, make sure that the product is OFF and disconnected from
the AC outlet.
PROTECTIVE GROUND
Before turning the unit on, make sure that it is connected to Ground. This is
to prevent the risk of electric shock. Never cut internal or external Ground
wires. Like wise, never remove Ground wiring from the Protective Ground
Terminal.
OPERATING SAFETY INSTRUCTIONS
Read these instructions. Follow all instructions. Keep these instructions. Do
not discard. Heed all warnings. Only use attachments/accessories specified by
the manufacturer.
POWER CORD AND PLUG
Do not tamper with the power cord or plug. These are designed for your safety.
Do not remove Ground connections! If the plug does not fit your AC outlet seek
advice from a qualified electrician. Protect the power cord and plug from any
physical stress to avoid risk of electric shock. Do not place heavy objects on
the power cord. This could cause electric shock or fire.
SERVICING
Refer all servicing to qualified service personnel only. Do not perform any
servicing then those instructions contained within this User’s Manual.
DISPOSAL
This symbol indicates that the disposal of this product is submitted to
local regulations. Please contact your local dealer.
Introduction
Thanks for the acquisition of the A300.4/A500.4 show. this four channel power amplifier has been developed to drive two satellites and one subwoofer in fixed installations requiring limited space in the bays. The A300.4/A500.4 has a high-efficiency thanks to his Class-D technology and can deliver 4 x 150 W RMS/4 Ohms or 2 x 150 W RMS/4 Ohms + 300 W RMS/8 Ohms(Bridged).
Main Features
- High current switching power allowing high power output with low noise and low distortion
- Substantial protection circuitry like thermal, short circuit, power on/off muting and Therefore protection
- Built-in limiter
- Euroblock input and output
- front mounted gain controls for easy access
- Signal, Clip protect, and Power LED indicators to monitor performance.
- Stereo/Parallel/Bridged/Mute/Select operation Mode
- Amplifier Disable/Prior/Failure Status
FUNCTIONS
-
Power Switch
It switches ON/OFF the unit main power. -
Level Control
These volume controls allow you to adjust the volume level. -
Power/Prior LED
The Green LED light up when the amplifier is powered ON.The Red LED light up when the amplifier is input priority -
Signal LED
These green LED light up when the respective channel’s output signal pass through . -
Protection LED
In normal operation, the LED will not illume; If the LED is red, it means the unit is in hea t protection, no sound is output. The speaker system is actually disconnected from the amplifier outputs when this LED is red, the temperature must be lowered by better ventilation and decrease the signal level etc. if the problem is corrected, the protection systems deactivate automatically, and normal amplifier operation is resumed. -
Clip LED
This red LED lights up when the input signal is too strong. it is time to reduce input level until clip LED turns off. -
Air Intake Vents
A300.4/A500.4 employ a variable speed internal cooling fan to intake the air through front grill to keep it running cool even under extreme operating conditions. Please keep these vents clear and free from obstruction at all times to insure proper cooling. -
Bridged LED
The Bridged LED light up when the amplifier is Bridged Mode.
-
AC Input
Use it to connect your A150.2/A300.2/A500.2 to the supplied AC cord. -
Euroblock input
CHA +:CHA balanced signal input+ or unbalanced signal input
CHA G:CHA signal GND
CHA – :CHA balanced signal input- or unbalanced signal not connect
CHB ,CHC and CHD are the same.
Fail: Failure Status output
Failure Status with +5V high level; disabled/protection/inactive are all with output low level.
DIS: Amplifier disabled ,input control PIN
While operating the disabled function of amplifier with +5V high level,linked to GND.the amplifier will shutdown with all protection LEDS lighting. at this moment the status will be changed from +5V high level (normal status) to Low level (amplifier disabled or unconnected.using the disabled function of the amplifier and then connect to speaker output ,finally the amplifier will start again after sucessful connection.
PRI: Input Priority Control PIN
When PRI connect to GND directly﹐TEST input has priority , at this moment VR RED LEDS lighting.
GND: signal GND and control GND.
TEST : Input Priority test/alarm signal
When PRI connect to GND directly, Test/alarm signal is the top priority level. -
Mode select
Mode 1: All channels stereo
All input and output channels are independent.
Mode 2: All channels parallel
All outputs are the same with any channel input.
Mode 3: A/B bridged C/D bridged
Input the signal to channel A, connect the speaker’s “+” to the output A+, connect speaker‘s ‘-’ to the output B+. Then you get a 300W(8Ω) power. CH C and CH D are the same.
Mode 4: A/B parallel C/D parallel
CHA output and CHB output are the same whether input from CH A or CH B. The CH C and
CH D are the same.
Mode 5: A/B stereo C/D bridged
CH A’s input and outputs are independent from CH B. CH C and CH D are bridged.
Mode 6: A/B parallel C/D bridged
CH A and CH B are parallel. CHC and CH D are bridged.
Mode 7: A/B stereo C/D SUB
CH A and CH B are stereo. CH C and CH D are bridged. SUB output signal is low frequency
from CHC input. X-OVER FREQ is available.
Mode 8: A/B stereo C/D SUB
CH A and CH B are stereo. CH C and CH D are bridged and the device filters and amplifies
signal A+B to feed the Subwoofer with the low frequencies only. X-OVER FREQ is available.
Mode 9: Amplifier Mute
Amplifier is Mute.
X-OVER FREQ is available in Mode 7 and Mode 8 only.
-
Speakers connectors
Euroblock speakers output.The up and down outputs are connected together. -
Vent Grille
This fan has three level speed. The fan will speed up when the temperature of the amplifie rise up. When you set the amplifie in mute mode, the fan run fastest. Check that the vent grille is not obstructed. -
X-OVER FREQ
Cut off frequency selectors for hi-pass (CH A, CH B) and low-pass (SUB) filters. The value can be set from 50 Hz to 250 Hz.
Applications
Inputs connections
The inputs can be connected to the Euroblock socket using the female free part
connectors supplied with the device. For balanced inputs use Hot pin(+), Cold
pin(-) and Ground pin (G) terminals. For unbalanced inputs use Hot pin(+) and
Ground pin (G) only.
Speaker connections
Check that the polarity is well respected for every speaker. Two Euroblocks
connected point to point are available for easy parallel set up. The impedance
output must not be channel. 
Technical Specifications
Power Specifications(tolerance +/-5%)
|
A300.4
|
A500.4
|
---|---|---|---
CHA/B
(One Channel drive)
| |
300W
|
600W
|
CHC & CHD
(All Channel drive)
|
2
4
|
600W x4
270W x4
|
1200W x4
|
450W x4
|
CHC & CHD
(Bridge Mono mode)
| |
1200W x2
|
2400W x2
|
|
540W x2
|
900W x2
|
THD|
|
(SUB Mode)
|
CHA-CHD
|
20 Hz – 20k Hz +0/-1 dB
250
|
|
|
|
|
| |
30
|
33
|
| |
| |
| Front panel:On/Off Power Switch,volum channel A,B& SUB
Real pauel:SUB,CHA+CHB selector: Cut off frequency selectors Modes select
|
| Bridged:Red LED Prior:Grean /Red LED|
| |
| |
| |
| 360|
| 6.2| 6.3|
Warranty
This device is warranted parts and labor against any manufacturing defects for
a period of two years from the date of purchase by the first user.
Conditions
- **** The unit has been installed and implemented by observing the safety instructions in this operating
- The device was not diverted from its destination, either voluntary or accidental, and suffered no deterioration or modification other than those described here or explicitly authorized by SHOW.
- All modifications or repairs have been carried out by an authorized service
- The defective product must be returned with the dealer who made the sale or to an authorized service station with proof of porchase.
- The device was properly packaged to avoid damage in transport.