amperes electronics
Professional Public Address (PA) System Manufacturer
QP2000 Series
Quantum Power Amplifier with AFS (Class AB)
QP2000 Series is a reliable range of Class AB amplifiers with built-in Auto Fault Sensor (AFS) and standby changeover relay for long-term PA installations. Available in power ratings of 125W (QP2125), 250W (QP2250), 375W (QP2375), 500W (QP2500).
Built-in protections against inrush current, overload, thermal, short circuit and fuse
RS485 port for remote controls and monitoring
Digital controls for volume, bass, treble, and fan speed with LCD display
AC/DC operation for backup use during power failure
Introduction
QP2000 Series is a reliable range of Class AB quantum power amplifiers available in four models — 125W (QP2125), 250W (QP2250), 375W (QP2375), and 500W (QP2500) — designed for long-term performance in public address installations. Built with Auto Fault Sensor (AFS) and an integrated standby changeover relay, this series features automatic backup switching during amplifier failure for uninterrupted operation.
Each unit includes RS485 port for remote monitoring and control via PC (through UART converter) or IP network using Amperes iPX5500 interface. Trusted for over a decade in countless projects, the QP2000 Series offers durability, intelligent protection, and flexibility for centralized or distributed PA systems.
Series model variants:
QP2125: 125W 100V Line
QP2250: 250W 100V Line
QP2375: 375W 100V Line
QP2500: 500W 100V Line
Packing information
Carton size : 550 (L) x 465 (W) x 180 (H) mm
Gross weight : QP2125: 13.50 kg / QP2250: 14.15 kg / QP2375: 18.0 kg / QP2500: 19.60 kg
Net weight: QP2250: 12.45 kg / QP2500: 17.85 kg
1 unit per carton for each model
Introduction
QP2000 Series is a reliable range of Class AB quantum power amplifiers available in four models — 125W (QP2125), 250W (QP2250), 375W (QP2375), and 500W (QP2500) — designed for long-term performance in public address installations. Built with Auto Fault Sensor (AFS) and an integrated standby changeover relay, this series features automatic backup switching during amplifier failure for uninterrupted operation.
Each unit includes RS485 port for remote monitoring and control via PC (through UART converter) or IP network using Amperes iPX5500 interface. Trusted for over a decade in countless projects, the QP2000 Series offers durability, intelligent protection, and flexibility for centralized or distributed PA systems.
Series model variants:
QP2125: 125W 100V Line
QP2250: 250W 100V Line
QP2375: 375W 100V Line
QP2500: 500W 100V Line
Packing information
Carton size : 550 (L) x 465 (W) x 180 (H) mm
Gross weight : QP2125: 13.50 kg / QP2250: 14.15 kg / QP2375: 18.0 kg / QP2500: 19.60 kg
Net weight: QP2250: 12.45 kg / QP2500: 17.85 kg
1 unit per carton for each model
QP2000 Series
Power Requirements/ Models
QP2125
QP2250
QP2375
QP2500
Power rating
125W 100V line
250W 100V line
375W 100V line
500W 100V line
Operating voltage
220 - 240V AC or 24V DC back up supply
Power consumption (240V AC)
294 VA (1.1A)
447 VA (1.7A)
749 VA (2.9A)
873 VA (3.3A)
Current consumption (24V DC)
5.9A
10.6A
16.7A
19.6A
Standby current (24V DC)
0.7A
0.9A
Connections & Protections
Input signal (sensitivity)
1V rms (+4 dBU) / 10k Ohm via Phoenix connectors
Input gain controls
-40 to 40 dBU
4 Ohm output voltage
22.3V
31.6V
38.7V
44.8V
Output impedance (max load)
80 Ohm
40 Ohm
27 Ohm
20 Ohm
Frequency response
70 - 15 kHz @ 1 kHz ±3 dB
S/N ratio
>70 dB @ 1 kHz, 1V
THD + N
<1%
Protections
Thermal, short circuit, overload, AC & DC fuses
Cut off temperature
75°C
Cooling system
Auto temperature controlled cooling fan with auto ON
Indicators
LCD with temperature, audio level and address
Data interface and baud rate
RS485, 19.2 kbps
Fault sensing
Internal Pilot Ton: 20 kHz, detection at 15 - 20 secs, 10 secs interval
Fault detection response
Standby amplifier relay activation, fault dry contact
Physical Specifications
Dimensions (W x H x D)
482 x 88 x 335 mm
Net weight
x kg
12.45 kg
x kg
17.85 kg
Note: The specification parameters may be changed, added, or omitted without prior notice. Last updated on 24 Apr 2026.
Available in 125W, 250W, 375W, and 500W (100V line)
Conventional Class AB quantum power amplifier
Built-in Auto Fault Sensor (AFS) with standby changeover relay for automatic switching
Digital controls for volume, bass, treble, and fan speed with LCD display
Adjustable cooling fan for thermal management
RS485 for remote monitoring and control via PC (UART converter) or IP network (with iPX5500)
Protection such as inrush current, overload, thermal, short circuit, and fuse
AC/DC operation for uninterrupted performance during power failure
High effiicency with low current consumption
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