Ahuja SSA 250DP PA Mixer Amplifier

KTI14002001PSSA

Product Description

The Ahuja SSA 250DP is a commercial-grade 250W RMS public address mixer power amplifier equipped with an integrated digital MP3 media player and Bluetooth connectivity for versatile sound reinforcement installations.

Make: Ahuja
Model: SSA-250DP
Rated Power Output: 250W RMS at 10% THD, 300W Max
Audio Inputs: 6 × Mic (0.65mV/4.7kΩ), 2 × Aux (100mV/470kΩ), 1 × Line Input (1V/50kΩ)
Outputs: Preamp Out (200mV/600Ω), Line Out (1V/1kΩ) for daisy chaining
Speaker Output Taps: 4Ω, 8Ω low-impedance and 70V / 100V high-impedance lines
Media Playback: Built-in MP3 player with USB, SD/MMC card reader, Bluetooth, and remote control
Tone Controls: Bass (±10dB at 100Hz) and Treble (±10dB at 10kHz)
Frequency Response: 50 Hz to 15,000 Hz ±3dB (SNR: 60dB)
Protection: Resettable thermal-magnetic circuit breaker for overload and short-circuit protection
Power Supply: 220–240V AC 50/60Hz (460VA) or 24V DC (requires 2 × 12V external car batteries (they are not included), 6A)

KTI14002001PSSA

Price

₹ 21,412.35 excl. GST

+ 18.00% Tax + Freight Charge

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Product Details
Available Brands	Ahuja
Unit	Numbers
HSN Code	85184000
Weight	16 kg
Dimension	L 45 x W 34 x H 16 cm cm ft in m
Warranty	12 Months No-Onsite Warranty
Tags/categories	Automation PA Solutions Amplifiers, Speakers

Usually dispatched within 5 days

About this product .

The Ahuja SSA-250DP is an industrial-grade public address mixer amplifier engineered for reliable, high-output continuous sound reinforcement. Built in a robust sheet metal rack/desktop enclosure, the unit features a high-capacity power transformer capable of delivering 250 Watts RMS (300 Watts Max) power across demanding audio distribution networks.
Equipped with 6 low-impedance microphone inputs, 2 auxiliary line inputs, and a dedicated mixer line input, the amplifier allows simultaneous connection and precise level mixing of multiple speech and background music sources. The integrated digital media module provides seamless playback from USB drives, SD/MMC flash cards, and wireless Bluetooth pairing, complete with dedicated playback navigation controls.
For system flexibility, the amplifier accommodates both low-impedance loudspeaker loads (4 Ohm and 8 Ohm) and distributed constant-voltage systems (70V and 100V lines). A dedicated Box Speaker / Driver Unit selector switch automatically attenuates bass frequencies when driving horn units, protecting delicate voice coils from mechanical stress and low-end distortion.
Dual-power operational capability ensures continuous uninterrupted operation in critical facilities. The amplifier runs on standard 220–240V AC utility mains and features instantaneous automatic failover to external 24V DC battery backup (requires 2 × 12V batteries (they are not included)) in the event of mains power interruption.
Designed for educational institutions, auditoriums, commercial complexes, places of worship, and industrial plant paging systems, the SSA-250DP includes preamplifier and line-level output jacks for linking additional booster amplifiers or feeding central recording equipment.
Maintenance and circuit integrity are supported by an integrated resettable thermal-magnetic circuit breaker that guards against excessive thermal loading, speaker line short circuits, and accidental output mismatches, eliminating downtime associated with fuse replacements.

Product Information .

Worship Places Shopping Malls, Showrooms Conference Rooms Auditorium Conference Hall Event Management

Ahuja SSA-250DP System & Electrical Compatibility

Loudspeaker Load and Output Distribution Compatibility

The Ahuja SSA-250DP public address mixer power amplifier is engineered to interface with both low-impedance loudspeaker configurations and high-voltage distributed line audio networks. The rear-panel terminal strip supports direct low-impedance loads rated at 4Ω and 8Ω for close-proximity sound reinforcement arrays, as well as 70V and 100V constant-voltage outputs designed for distributed commercial paging installations.

When deploying 70V or 100V speaker lines across industrial plants, auditoriums, educational institutions, or commercial facilities, the amplifier matches seamlessly with ceiling speakers, sound columns, and projection horns equipped with step-down Line Matching Transformers (LMT). To protect high-frequency horn driver diaphragms from low-frequency mechanical overload, the amplifier integrates a dedicated Box Speaker / Driver Unit selector switch. Setting the switch to the Driver Unit position defeats the internal bass boost (+10dB at 100Hz), tailoring the output spectrum for driver units and horn arrays.

Input Transducer and Audio Source Integration

The front and rear mixing sections provide extensive source compatibility across standard line-level devices and professional dynamic microphones:

Microphone Channels: Six dedicated microphone input channels with an input sensitivity of 0.65mV and an input impedance of 4.7kΩ, accepting low-impedance balanced and unbalanced dynamic microphones.
Auxiliary Inputs: Two auxiliary inputs (Aux-1 and Aux-2) rated at 100mV sensitivity with a 470kΩ input impedance, compatible with external media players, tuners, and standard consumer line-level equipment.
Direct Line Input: A dedicated 1V / 50kΩ Line Input allows the SSA-250DP to function purely as a slave power amplifier when driven by the master output of an external PA mixing console or another audio processor.
Digital Media & Wireless Connectivity: An onboard digital audio playback module supports direct file streaming from USB flash memory drives, SD/MMC storage cards, and wireless Bluetooth-enabled transmitting devices.

Amplifier Linking and Signal Distribution

For scalable sound reinforcement architectures requiring distributed amplification, the SSA-250DP provides dedicated preamplifier and line-level outputs:

Preamplifier Output: Rated at 200mV into 600Ω, allowing the mixed input signal (including tone shaping from the ±10dB Bass and Treble controls) to be routed to signal processors or secondary distribution mixers.
Line Output: Rated at 1V into 1kΩ, engineered specifically for daisy-chaining downstream high-power booster amplifiers or feeding high-fidelity audio recording equipment without loading the master preamplification stage.

Power Infrastructure and Backup DC Operation

The amplifier is compatible with standard utility AC mains supplies rated at 220–240V AC at 50/60Hz with a nominal operating power consumption of 460VA. For critical life-safety, paging, and industrial communication systems that demand uninterrupted operation during utility grid failures, the power section includes a 24V DC backup input. This input interfaces with two external 12V car batteries (they are not included) configured in series (drawing up to 6A DC at full output), with built-in circuitry providing instantaneous, automatic transfer to battery power if AC mains voltage is interrupted.

Installation, Wiring, and Audio Integration Guidelines

Mains Power Supply and 24V DC Emergency Backup Setup

The Ahuja SSA-250DP PA mixer amplifier operates from standard AC mains power at 220–240V AC 50/60Hz, drawing a rated power consumption of 460VA. For continuous industrial plant paging, institutional announcements, and mission-critical public address setups, the amplifier features dedicated rear-panel terminals for 24V DC operation.

Connect an external 24V DC source consisting of two 12V car batteries (they are not included) wired in series to the DC terminal block with strict adherence to polarity. In the event of AC mains power interruption, internal circuitry executes an instantaneous automatic switchover to the 24V DC battery supply (they are not included), drawing up to 6A current under full operational load without causing interruption or signal dropouts.

Speaker Line Routing and Impedance Matching

The amplifier provides multiple speaker terminal output taps designed for either direct low-impedance connections or distributed constant-voltage lines. Ensure the total load connected to the output terminals matches the electrical limits of the 250W RMS (300W maximum) rated power stage.

Low-Impedance Taps (4Ω and 8Ω): Used for direct connection to standard low-impedance box speakers. Always calculate series/parallel speaker network impedance to match 4Ω or 8Ω exactly. Do not connect low-impedance loads to 70V or 100V terminals.
Constant Voltage Lines (70V and 100V): Designed for distributed speaker networks spanning long cable distances. Connect only speakers equipped with 100V or 70V line-matching transformers (LMT), such as ceiling speakers and sound columns. Ensure the aggregate wattage sum of all transformer taps does not exceed 250W RMS.

Box Speaker vs. Driver Unit Selector Switch

The rear panel is equipped with a dedicated Box Speaker / Driver Unit selector switch to match output acoustic filtering to the connected transducer type. When driving horn driver units for industrial or outdoor paging, set this switch to 'Driver Unit' mode. This setting automatically defeats the low-frequency bass boost circuit, protecting delicate driver unit voice coils and diaphragms from mechanical damage caused by excessive low-frequency excursion.

When connecting broad-range wooden or molded box speakers, set the switch to 'Box Speaker' mode to retain full tone shaping capability across the 50 Hz to 15,000 Hz (±3dB) frequency response range, including front-panel Bass (±10dB at 100Hz) and Treble (±10dB at 10kHz) adjustments.

Audio Input Interfacing and Amplifier Cascading

Integrate input sources across the 6 microphone input channels (0.65mV/4.7kΩ sensitivity), 2 auxiliary inputs (100mV/470kΩ), or the integrated digital MP3/Bluetooth player. When feeding audio directly from an external master PA audio mixer or another primary mixing console, route the signal into the 1V/50kΩ Line Input.

To expand system wattage capacity, utilize the Line Output (1V/1kΩ) or Preamplifier Output (200mV/600Ω) to daisy-chain additional booster power amplifiers or connect external audio recording units without loading down the primary mixing stage.

Physical Rack and Bench Installation Parameters

Parameter	Installation Specification
Chassis Dimensions	450 mm (Width) x 160 mm (Height) x 340 mm (Depth)
Net Unit Weight	16.0 kg
Primary AC Input	220–240V AC, 50/60 Hz (460VA)
Secondary DC Input	24V DC (2 x 12V external batteries (they are not included), 6A)
Output Tap Terminations	4Ω, 8Ω, 70V, 100V
Overcurrent Protection	Rear-panel resettable thermal-magnetic circuit breaker

Ahuja SSA-250DP Fault Diagnosis and Operational Troubleshooting

The Ahuja SSA-250DP is a 250W RMS (300W Max) public address mixer amplifier engineered for multi-speaker networks and continuous operation. When experiencing system faults, audio degradation, or power interruptions, systematically follow the technical troubleshooting procedures below.

1. Resettable Circuit Breaker Tripping & Overload Shutdown

The SSA-250DP incorporates a rear-panel resettable thermal-magnetic circuit breaker that trips during excessive current draw, load short circuits, or impedance mismatches, isolating the output stage without requiring fuse replacement.

Speaker Impedance Mismatch: Ensure that low-impedance loads connected across the COM and 4Ω or 8Ω terminals match the nominal load. Never connect a combined speaker load below 4Ω to low-impedance taps.
Line Distribution Overload: When driving 70V or 100V line-matching transformer (LMT) speaker networks, sum the wattage ratings of all connected speaker taps. The total power draw must not exceed the amplifier's rated 250W RMS capacity.
High-Voltage vs. Low-Impedance Terminal Cross-Wiring: Never connect low-impedance speakers (4Ω or 8Ω) directly to the 70V or 100V terminals. Doing so causes severe current overdraw and immediately trips the breaker.
Resetting Procedure: Disconnect the AC mains power, rectify the speaker short or load impedance mismatch, wait for the breaker mechanism to cool, and push the breaker plunger back in before powering on.

2. Audio Distortion, Noise, and Frequency Clipping

Total Harmonic Distortion is rated at 10% at the 250W RMS limit, with a baseline frequency response of 50 Hz to 15,000 Hz (±3dB) and a 60dB signal-to-noise ratio. Audio distortion typically stems from improper gain staging or incorrect tone settings.

Input Sensitivity Overdrive: The SSA-250DP provides 6 Microphone inputs (0.65mV/4.7kΩ), 2 Auxiliary inputs (100mV/470kΩ), and 1 Line input (1V/50kΩ). Connecting line-level audio sources into high-gain Mic inputs will overdrive the preamplifier stage. Route external mixers or playback consoles strictly to Aux (100mV) or Line In (1V).
Tone Control Saturation: Bass (±10dB at 100Hz) and Treble (±10dB at 10kHz) controls provide significant frequency equalization. Operating with excessive bass boost near rated peak power (300W Max) pushes the amplifier into clipping. Reduce tone knobs toward the flat (0dB) center position.

3. Driver Unit Protection & Horn Acoustic Optimization

Operating high-frequency acoustic horn driver units on full-range signals can cause mechanical diaphragm damage from low-frequency excursions.

Selector Switch Verification: Verify the position of the rear/front 'Box Speaker / Driver Unit' selector switch.
Driver Unit Mode: When connecting horn driver units, always set the switch to 'Driver Unit'. This defeats the internal bass boost circuit to protect the voice coil and diaphragm from low-frequency stress.
Box Speaker Mode: Use 'Box Speaker' mode only when driving sealed or ported full-range cabinet speakers requiring low-end response down to 50 Hz.

4. Power Supply Faults & 24V DC Transfer Diagnostics

The unit operates on 220–240V AC (50/60Hz, 460VA consumption) with automatic instantaneous failover to 24V DC battery backup (they are not included) drawing up to 6A.

No Power on AC Mains: Verify input voltage is within 220–240V AC. Check mains cable integrity and verify that the front-panel power switch illuminates.
DC Failover Failure: When using external 24V DC backup consisting of 2 x 12V car batteries (they are not included), ensure strict terminal polarity across the rear DC terminals. Reverse polarity or depleted batteries (they are not included) below 24V nominal will prevent DC operation during AC grid loss.

5. Signal Routing: Preamplifier, Line Output & MP3/Bluetooth Interface

No Signal to Booster Amplifiers: When daisy-chaining secondary power amplifiers, utilize the Line Output (1V/1kΩ) or Preamplifier Output (200mV/600Ω). Verify interconnect cables and ensure slave amplifier inputs accept standard 1V line levels.
Digital Player / Bluetooth Link Issues: If audio is absent from the integrated MP3 player, check USB/SD media formatting and file structure. For Bluetooth streaming, ensure the source device is paired within standard line-of-sight range and that the digital player master volume is unmuted.

Industrial and Commercial Application Environments for Ahuja SSA-250DP

Industrial Plant Paging and Perimeter Horn Systems

The Ahuja SSA-250DP delivers 250W RMS (300W maximum) rated power output, engineered to drive distributed acoustic horn networks in manufacturing shop floors, processing yards, logistics warehouses, and industrial perimeters. When operating reflex horns or driver units over extended cable runs, the unit utilizes its 70V and 100V high-voltage constant distribution line taps. Installers engage the dedicated Box Speaker/Driver Unit selector switch in the Driver Unit position, which automatically defeats low-frequency bass boost (±10dB at 100Hz) to prevent mechanical diaphragm over-excursion and thermal overload in horn driver units.

For mission-critical industrial facilities where operational paging and safety dispatch must remain active during power interruptions, the amplifier features an instantaneous automatic switchover to 24V DC backup power via 2 x 12V external car batteries (they are not included). Drawing 6A DC at full load, this continuous operational capability ensures plant emergency messaging and shift coordination remain intact during primary AC mains (220–240V 50/60Hz) failure.

Educational Campuses, Auditoriums, and Assembly Halls

With an integrated front-panel mixer supporting 6 microphone inputs (0.65mV/4.7kΩ), 2 auxiliary inputs (100mV/470kΩ), and 1 line input (1V/50kΩ), the SSA-250DP functions as a central audio hub for school auditoriums, lecture halls, and institutional multipurpose spaces. The wide frequency response of 50 Hz to 15,000 Hz (±3dB) and 60dB signal-to-noise ratio provide clear speech intelligibility and balanced acoustic reproduction for multi-speaker panels, stage presentations, and podium microphones.

Audio engineers can connect external mixing consoles directly into the 1V/50kΩ Line Input or route the preamplifier stage output (200mV/600Ω) and line output (1V/1kΩ) to secondary booster amplifiers to expand sound coverage across large indoor seating tiers without loading the primary power stage. The line output also enables direct integration with external hardware for programme recording.

Places of Worship and Multi-Zone Community Facilities

Places of worship demand precise vocal transmission combined with background musical accompaniment. The built-in digital media player allows direct playback of recorded audio from USB flash drives and SD/MMC memory cards, alongside wireless playback via the integrated Bluetooth facility. Independent bass (±10dB at 100Hz) and treble (±10dB at 10kHz) cut/boost controls allow acoustic matching to reverberant halls, minimizing low-end rumble while enhancing vocal clarity across 4Ω or 8Ω low-impedance speaker setups and 100V line-matching transformer (LMT) column arrays.

Commercial Complexes and Centralized Background Music (BGM)

In commercial facilities, shopping centers, and office buildings, the SSA-250DP drives distributed 100V line-matching ceiling speaker networks. The rear-panel resettable thermal-magnetic circuit breaker protects internal transformer and output stage components from field wiring faults, line short circuits, or impedance mismatching without requiring fuse replacement, ensuring continuous operation in multi-speaker commercial infrastructure.

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