amperes electronics
Professional Public Address (PA) System Manufacturer
QD2000 Series
Power Amplifier with AFS (Class D)
QD2000 Series is a high-efficiency Class D amplifier range (250W to 1000W) with AFS. It is suitable for most premium PA installations for centralized or decentralized network systems.
Supports 100V line and 4 Ohm outputs
Built-in Auto Fault Sensor (AFS) and standby changeover relay
RS485 output for remote monitoring
Built-in protections against inrush current, overload, thermal, short circuit and fuse
Introduction
QD2000 Series is a range of high-performance Class D power amplifiers with switching power supply designed for modern public address systems, available in 250W, 500W, 750W, and 1000W 100V line outputs. Built with energy-efficient circuitry, these amplifiers offer wider frequency response, and low heat generation.
Built with Auto Fault Sensor (AFS) and an integrated standby changeover relay, this series features automatic backup switching during amplifier failure for uninterrupted operation. It also includes an RS485 communication port for remote monitoring, and an API is available for third-party software integration. Whether used in centralized or decentralized installations, the QD2000 Series is ideal for premium PA system setups that demand efficiency, durability, and smart monitoring.
Series model variants:
QD2025: 250W 100V Line
QD2050: 500W 100V Line
QD2075: 750W 100V Line
QD2100: 1000W 100V Line
Packing information
Carton size : 550 (L) x 465 (W) x 180 (H) mm
Gross weight : QD2025 & QD2050: 8.4 kg / QD2075: 9.00 kg / QD2100
1 unit per carton for each model
Introduction
QD2000 Series is a range of high-performance Class D power amplifiers with switching power supply designed for modern public address systems, available in 250W, 500W, 750W, and 1000W 100V line outputs. Built with energy-efficient circuitry, these amplifiers offer wider frequency response, and low heat generation.
Built with Auto Fault Sensor (AFS) and an integrated standby changeover relay, this series features automatic backup switching during amplifier failure for uninterrupted operation. It also includes an RS485 communication port for remote monitoring, and an API is available for third-party software integration. Whether used in centralized or decentralized installations, the QD2000 Series is ideal for premium PA system setups that demand efficiency, durability, and smart monitoring.
Series model variants:
QD2025: 250W 100V Line
QD2050: 500W 100V Line
QD2075: 750W 100V Line
QD2100: 1000W 100V Line
Packing information
Carton size : 550 (L) x 465 (W) x 180 (H) mm
Gross weight : QD2025 & QD2050: 8.4 kg / QD2075: 9.00 kg / QD2100
1 unit per carton for each model
QD2000 Series
Power Requirements / Models
QD2025
QD2050
QD2075
QD2100
Power rating
250W 100V line
500W 100V line
750W 100V line
1000W 100V line
Operating voltage
220 - 240V AC : 50 / 60 Hz or 21-30V DC back up supply
Power consumption (240V AC)
350VA (1.3W)
650VA (2.6A)
1000VA (3.9A)
1300VA (5.1A)
Current consumption (240V AC)
15A
25A
40A
50A
Standby current (24V DC)
1.2A (Standby input OFF)
Connectivity
Input signal (sensitivity)
1V rms balanced input via Phoenix connector (15k Ohm)
Input link (buffered)
0 dB balanced line (10k Ohm)
Input signal standby
Switchable: Auto detect on standby or Always ON
Input HF filter
150 Hz @ -3 dB slop via DIP switch
Output
100V line / 4 Ohm
4 Ohm output voltage
50V
Frequency response
60 - 20 kHz (± 3 dB, 1 kHz)
S/N ratio
>68 dB
THD + Noise
<1%
Protections
Thermal, short circuit, overload, AC and DC fuses, standby
Cut off temperature
75°C
Data interface and baud rate
RS485, 19.2 kbps
Indicators
Signal, temperature, fault contact, power LEDs
Fault relay
NO dry contact (3A)
Cooling system
Auto temperature-controlled cooling fan with auto ON
Operating temperature
-10° to 45°C
Storage temperature
-40° to 70°C
Humidity
95%
Physical Specifications
Dimensions (W x H x D)
482 x 88 x 340 mm
Weight
6.8 kg
6.8 kg
7.0 kg
7.1 kg
Note: The specification parameters may be changed, added, or omitted without prior notice. Last updated on 23 Apr 2026.
Support 100V line and 4 Ohm outputs
High-efficiency Class D amplifier with energy-efficient circuitry, wider frequency response, and low heat generation
Built-in Auto Fault Sensor (AFS) with dry contact and standby changeover relay for automatic switching
Switchable high-pass filter to protect speakers
RS485 for remote monitoring and control via PC (UART converter) or IP network (with iPX5500)
API support for system integration
High effiicency with low current consumption
Protection such as inrush current, overload, thermal, short circuit, and fuse
Adjustable cooling fan for thermal management
AC/DC operation for uninterrupted performance during power failure
Standby mode to save power when idle
DC soft start to prevent power surges
Switachable standby input detection for low power consumption during DC backup
Compact 2HU rack-mount design
Registered association members of
International recognitions
© 1999 - 2026 Amperes Electronics Sdn Bhd. All Rights Reserved.
Payment
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Sales Office (Malaysia)
70, Jalan Industri PBP 3,
Taman Perindustrian Pusat Bandar Puchong,
47100 Puchong, Selangor, Malaysia.
Tel: +603-5882 7757 / 7758
Production Factory (Malaysia)
2, Jalan Meranti Puchong D25@Meranti Puchong
47120 Puchong, Selangor, Malaysia
Export Sales Office (Singapore)
Amperes Asia Pte Ltd
(Co Reg: 201102253E)
1, North Bridge Road, #13-03, High Street Centre, Singapore 179094
Amperes Electronics Sdn Bhd
SSM Registration No: 200001006420 (509025-X)
Your Trusted PA System Manufacturer since 1999
Sales Office (Malaysia)
70, Jalan Industri PBP 3,
Taman Industri Pusat Bandar Puchong
47100 Puchong, Selangor, Malaysia.
Tel: +603-5882 7757 / 7758
Production Factory (Malaysia)
2, Jalan Meranti Puchong D25@Meranti Puchong 47120 Puchong, Selangor, Malaysia
Export Sales Office (Singapore)
Amperes Asia Pte Ltd
(Co Reg: 201102253E)
1, North Bridge Road, #13-03, High Street Centre, Singapore 179094