Ahuja APA 240 325W 19 inch rack mount PA booster amplifier front panel

Ahuja APA 240 PA Power Amplifier

KTI14002001PAA3

Product Description

The Ahuja APA-240 is a high-power 325W RMS installation booster and power amplifier designed for continuous-duty commercial and industrial public address systems.

Make / Brand: Ahuja
Model: APA-240
Power Output: 415W Max., 325W RMS at 10% THD, 300W RMS at 5% THD, 275W RMS at 2% THD
Output Regulation: ≤ 2 dB, no load to full load at 1kHz
Input Channels: 1 × 200mV/470kΩ (unbalanced), 2 × 1V/50kΩ (balanced XLR), 1 × 100V input
Frequency Response: 50 – 15,000 Hz (±3 dB)
Signal to Noise Ratio: 60 dB
Tone Controls: Bass ±10 dB at 100 Hz, Treble ±10 dB at 10 kHz
Loop-Through Outputs: 1 × 200mV/600Ω, 2 × 1V/1kΩ
Speaker Outputs: 4Ω, 8Ω, 70V, and 100V line
Power Supply: AC 220–240V 50/60Hz, DC 24V (operable via 2 × 12V car battery (they are not included))
Power Consumption: AC 600VA, DC 7A
Dimensions & Weight: W485 × H142 × D405 mm, 20.6 kg

KTI14002001PAA3

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Product Details
Available Brands	Ahuja
Unit	Numbers
HSN Code	85423300
Weight	20.6 kg
Dimension	L 48.5 x W 40.5 x H 14.2 cm cm ft in m
Warranty	12 Months No-Onsite Warranty
Tags/categories	Automation PA Solutions Amplifiers, Speakers

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About this product .

The Ahuja APA-240 is an installation public address power booster amplifier built in a robust 19-inch rack-mountable metal chassis. It delivers a nominal power output of 325 Watts RMS (415W maximum), engineered for heavy-duty commercial audio distribution across industrial, educational, and institutional complexes.
Featuring wide audio routing flexibility, the unit is equipped with two balanced 1V line inputs via standard XLR connectors, an unbalanced 200mV line input, and a high-voltage 100V line input designed to receive signals over long transmission distances from pre-existing distribution networks. A built-in priority circuit ensures that one 1V line input overrides all secondary inputs for urgent voice paging.
For wide-area zoning and multi-amplifier cascading, loop-through line outputs (200mV and 1V) allow seamless daisy-chaining of additional booster amplifiers. Loudspeaker connectivity accommodates both low-impedance configurations (4 Ohm and 8 Ohm) and distributed constant-voltage systems (70V and 100V line transformers) with tight output regulation under 2 dB from no-load to full-load.
To guarantee audio fidelity in complex multi-equipment racks, the rear panel incorporates an integrated ground lift switch that effectively decouples signal ground from chassis earth to eliminate 50Hz ground loops and mains hum. Tailored frequency balancing is provided by independent bass and treble tone controls providing +/-10 dB adjustment.
The amplifier is dual-power enabled, operating on 220-240V AC mains or 24V DC battery supply (operable with 2 x 12V external car battery (they are not included)) with instantaneous automatic transfer during mains power loss. System safety is reinforced with a resettable thermal-magnetic circuit breaker providing fail-safe protection against output overloads and direct speaker line short-circuits.

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Product Information .

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Audio Input, System Interfacing, and Load Compatibility

The Ahuja APA-240 high-power booster amplifier is engineered for seamless integration into industrial, commercial, and institutional public address architectures. To accommodate a diverse range of upstream signal sources, audio distribution topologies, and multi-zone configurations, the amplifier provides versatile input, looping, and load connection interfaces designed according to professional PA engineering standards.

Audio Source and Line Input Compatibility

The APA-240 features multiple input options to match various audio line-level sources, mixer preamplifiers, and distribution consoles:

Balanced Line Inputs: Incorporates 2 × 1V / 50kΩ balanced inputs terminated via XLR connectors. These are engineered for balanced preamplifier outputs and professional audio matrices, offering high common-mode noise rejection over long cable runs. One of these 1V inputs features an integrated priority override circuit, automatically overriding other input channels for emergency notifications and high-priority paging.
Unbalanced Auxiliary Input: Features 1 × 200mV / 470kΩ unbalanced line input suitable for standard commercial media players, auxiliary tone generators, and standard unbalanced source gear.
100V Distributed Line Input: Includes a dedicated 100V line input designed to receive an amplified 100V audio signal directly from an existing speaker line or master amplifier. This enables slave booster placement across long transmission lines without experiencing line-level signal attenuation.

Amplifier Cascading and Loop-Through Outputs

For large facilities requiring expansion beyond 325W RMS output, the APA-240 provides dedicated loop-through line outputs. These allow engineers to cascade the audio signal to secondary booster units or slave amplifiers without requiring external signal distribution splitters:

Unbalanced Loop Output: 1 × 200mV / 600Ω output matching standard unbalanced line routing.
Balanced Loop Outputs: 2 × 1V / 1kΩ outputs designed for cascading into additional balanced power amplifiers.

Loudspeaker Load and Distribution Compatibility

The output stage of the APA-240 is designed to drive both low-impedance direct loads and constant-voltage distributed speaker lines:

Low-Impedance Taps (4Ω and 8Ω): Compatible with direct low-impedance loudspeaker arrays, near-field industrial monitors, and standard low-impedance cabinet enclosures.
Constant-Voltage High-Impedance Lines (70V and 100V): Compatible with multi-speaker distributed networks fitted with step-down line matching transformers, such as ceiling speakers, wall-mount column speakers, and paging horn arrays in large facilities like hospitals, schools, commercial complexes, and industrial sites.

Rack and Electrical Power Compatibility

The amplifier is built in a 19-inch standard rack-mountable chassis (dimensions: W485 × H142 × D405 mm; weight: 20.6 kg), allowing installation in standard 19-inch equipment racks or standalone tabletop operation. It operates on AC mains (220–240V 50/60Hz, 600VA consumption) and supports instant automatic transfer to an external DC 24V backup power source (operable via 2 × 12V Car Battery (they are not included), consuming 7A) to ensure uninterrupted public address operation during mains outages.

Rack Integration and Wiring Guide for Ahuja APA-240 Booster Amplifier

Chassis Mounting and Physical Placement

The Ahuja APA-240 is built in a heavy-duty 19-inch rack-mountable chassis measuring 485 mm in width, 142 mm in height, and 405 mm in depth, with a total unit weight of 20.6 kg. System integrators can install the booster amplifier directly into standard 19-inch equipment racks or deploy it in standalone tabletop configurations across commercial, institutional, and industrial facilities.

When racking multiple power units, ensure adequate vertical spacing within the equipment rack to support ambient air circulation. The substantial 20.6 kg chassis requires secure fastening using appropriate rack screws and rail supports within the cabinet to prevent mechanical stress on the front mounting ears.

Audio Input Connections and Cascade Configuration

The amplifier provides versatile input interfaces to integrate with preamplifiers, audio mixers, or existing high-voltage public address distribution lines:

Balanced Line Inputs: Two 1V / 50kΩ balanced inputs terminated via standard XLR connectors, providing low-noise transmission across extended cable runs. One 1V line input features priority override over all other input sources, ideal for emergency paging.
Unbalanced Auxiliary Input: One 200mV / 470kΩ unbalanced input for standard line-level audio equipment.
100V Distribution Line Input: A dedicated 100V high-voltage input allows the APA-240 to receive speaker line feeds directly from an upstream master amplifier, enabling booster distribution over long distances.
Loop-Through Line Outputs: Rear loop-through outputs—rated at 1 × 200mV / 600Ω and 2 × 1V / 1kΩ—facilitate clean signal chaining into additional slave booster amplifiers without signal degradation.

Loudspeaker Load Matching and Tap Selection

The amplifier delivers up to 415W Max. (325W RMS at 10% THD, 300W RMS at 5% THD, and 275W RMS at 2% THD) with an output regulation of ≤ 2 dB from no load to full load at 1kHz. Installers must match speaker cabling to the correct output terminal barrier strip according to system architecture:

Output Terminal	Impedance / Voltage Rating	Typical Application
Direct Low-Impedance	4 Ω / 8 Ω	Short cable runs, high-fidelity local sound systems
Constant Voltage Line	70V / 100V	Long-distance multi-speaker distributed networks (matching transformers)

Mains AC Wiring and 24V DC Emergency Backup

Connect the amplifier to a stable AC 220–240V 50/60Hz mains supply (power consumption rated at 600VA). For critical communication setups requiring uninterruptible public address operation, connect a 24V DC auxiliary source (operable via 2 × 12V Car Battery (they are not included)) drawing up to 7A. The unit features built-in instant transfer circuitry that switches seamlessly to 24V DC battery power (they are not included) if primary AC power fails.

Ground Loop Hum Mitigation and Circuit Protection

In multi-unit rack installations, ground potential differences can create audible 50Hz mains hum. The APA-240 includes a dedicated ground lift switch on the rear panel that isolates signal ground from chassis earth to break ground loops instantly. The amplifier is equipped with an integrated resettable circuit breaker that guards against excessive thermal overloads and external loudspeaker line short circuits.

Ahuja APA-240 Diagnostic and Fault Isolation Guide

When integrating the Ahuja APA-240 installation booster amplifier into commercial PA distribution systems, commissioning engineers may encounter operational anomalies related to grounding, line matching, impedance loading, or backup power. Systematic troubleshooting ensures rapid resolution while protecting connected transducers and upstream mixing consoles.

Mains Hum, Ground Buzz, and Noise Floor Issues

Extraneous 50 Hz hum or line noise typically indicates ground potential differentials between interconnected audio hardware across standard 19-inch rack enclosures. The APA-240 provides specific controls to address multi-equipment grounding issues.

Engage Ground Lift: Locate the ground lift switch on the rear panel. Toggling this switch isolates chassis ground from audio signal ground to eliminate ground loops in interconnected multi-unit racks.
Input Line Configuration: Verify whether balanced XLR connections (2 x 1V/50kΩ) or unbalanced line inputs (1 x 200mV/470kΩ) are deployed. Balanced line configurations provide superior common-mode rejection against induced electrical interference.
Signal-to-Noise Verification: Verify upstream mixer gain staging if background hiss exceeds the standard 60 dB signal-to-noise ratio rating of the power amplifier.

Overload Cutout, Tripping Breaker, and Output Shutdown

The APA-240 incorporates internal protective circuitry designed to prevent thermal and electrical damage under abnormal operating conditions.

Reset Circuit Breaker: The amplifier is equipped with a resettable circuit breaker designed to trip during short-circuit events or sustained thermal overloads. Disconnect AC mains, identify the line fault, clear the short, and reset the breaker mechanism on the rear panel.
Check Output Load Matching: Confirm that loudspeaker networks are connected exclusively to either low-impedance taps (4Ω or 8Ω) or constant-voltage line taps (70V or 100V). Never bridge low-impedance drivers across high-voltage distribution terminals.
Line Regulation and THD Loading: Ensure speaker total wattage does not exceed the continuous RMS power ratings: 275W RMS at 2% THD, 300W RMS at 5% THD, or 325W RMS at 10% THD (415W Max.). Excessive loading causes the amplifier regulation to exceed its ≤ 2 dB (no load to full load at 1kHz) design window.

Signal Muting and Priority Channel Override

If background music or general distribution feeds drop unexpectedly while the amplifier remains powered, inspect the active input routing.

Priority Override Engagement: One dedicated 1V line input features automated priority override over all other auxiliary inputs. If audio signal is present on this specific channel (such as an automated emergency notification or master paging mic), secondary input feeds are muted automatically.
Input Signal Level Mismatch: When feeding audio from high-voltage distribution lines, use the dedicated 100V line input rather than the 200mV or 1V preamplifier inputs to prevent severe input clipping.

Power Transfer and DC Backup Operation

For installations requiring continuous operation during AC mains failure, the APA-240 supports instant transfer to a DC 24V power supply (operable via 2 x 12V Car Battery (they are not included)).

DC Supply Capacity: Verify that the DC 24V line can supply up to 7A continuous current at full rated amplifier output.
AC Mains Monitoring: Ensure incoming AC mains line voltage stays within the rated 220–240V 50/60Hz window (600VA consumption) to avoid unintended automatic transfer to DC battery power.
Tone Control Balancing: Check that Bass (±10 dB at 100 Hz) and Treble (±10 dB at 10 kHz) adjustments have not been set to extreme boost levels, which increases current draw and accelerates battery discharge during emergency power failover.

Industrial and Commercial Public Address Applications

Commercial Facilities and Retail Outlets

The Ahuja APA-240 power amplifier is engineered for distributed audio setups across department stores, shopping malls, and commercial complexes. With a maximum power output of 415W (325W RMS at 10% THD and 275W RMS at 2% THD), the amplifier delivers consistent sound pressure levels across broad floor plans. System integrators can leverage the 70V and 100V line speaker outputs to drive distributed ceiling speakers and wall-mount sound columns over extended cable lengths without signal degradation, maintaining tight output regulation of ≤ 2 dB from no load to full load at 1kHz.

Educational Institutions and Campus Paging

In educational environments such as schools, colleges, and university auditoriums, the APA-240 operates as a central booster amplifier for announcements, bells, and background audio. Its balanced XLR connector inputs (2 x 1V/50kΩ) protect against external electromagnetic interference over long signal runs from remote mixing consoles. Additionally, the integrated 100V line input allows direct slaving to existing high-voltage public address distribution lines, simplifying phased infrastructure expansions.

Healthcare and Critical Announcement Systems

Hospitals and medical centres require high audio intelligibility and constant operational readiness. The APA-240 features a dedicated 1V line input with priority override capability over all other input channels, ensuring emergency notifications and crisis paging instantly mute general program material. In the event of an AC mains power failure (AC 220-240V 50/60Hz), the internal circuitry provides instant switchover to a DC 24V backup power source (operable via 2 x 12V Car Battery (they are not included)), preventing interruption during facility emergencies.

Multi-Zone Industrial Complexes and Cascaded Networks

For extensive industrial plants, warehouses, and transport hubs requiring multiple amplification zones, the unit incorporates dedicated loop-through line outputs (1 x 200mV/600Ω and 2 x 1V/1kΩ). These connectors enable daisy-chaining audio signals into additional booster or slave amplifiers without requiring external signal distribution splitters.

Ground Loop Elimination: In multi-chassis equipment racks, the rear-panel ground lift switch disconnects audio signal ground from chassis earth, isolating 50Hz hum and interference common in complex industrial earthing schemes.
Dual Impedance Matching: Direct support for low-impedance loudspeaker loads (4Ω and 8Ω) alongside high-voltage distributed line arrays (70V and 100V) provides engineering flexibility across diverse acoustic environments.
Equipment Integration: Built into a standard 19-inch rack-mountable housing (W485 x H142 x D (they are not included)405 mm, weighing 20.6 kg), it installs directly into standard central control room racks or functions as a standalone tabletop booster unit.

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