Ahuja SSA 250M 250W PA mixer amplifier with front control knobs and carrying handles

Power Amplifier Ahuja SSA 250M

KTI14002001SS25

Product Description

The Ahuja SSA 250M is a heavy-duty 250-watt public address mixer amplifier engineered for reliable continuous operation in commercial, educational, and industrial sound reinforcement systems.

Make / Brand: Ahuja Radios
Model: SSA-250M (SSA 250M)
Power Output: 300W Max, 250W RMS at 10% THD, 220W RMS at 5% THD, 200W RMS at 2% THD
Input Channels: 6 × Microphone (0.65mV / 4.7kΩ), 2 × Auxiliary (100mV / 470kΩ), 1 × Line Input (1V / 50kΩ)
Output Terminals: Preamplifier Output (200mV / 600Ω), Line Output (1V / 1kΩ)
Speaker Load Taps: 4Ω, 8Ω (low-impedance), 70V and 100V (distributed line transmission)
Frequency Response: 50 Hz – 15,000 Hz ±3 dB
Signal to Noise Ratio: 60 dB
Tone Control: Bass and Treble ±6 dB adjustment at 100 Hz and 10 kHz
Protection: Resettable thermal-magnetic circuit breaker for overload and short-circuit protection
Power Supply: 220–240V AC 50/60 Hz (460VA) or 24V DC external battery supply (2 × 12V car batteries (they are not included), 6A consumption)
Enclosure Dimensions: 450 mm (W) × 160 mm (H) × 340 mm (D)
Net Weight: 16.0 kg

KTI14002001SS25

Price

₹ 19,722.15 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 3 days

About this product .

The Ahuja SSA 250M is a high-power public address mixer amplifier delivering up to 300W maximum and 250W RMS audio output. Built in a robust steel chassis with front-mounted metal carrying handles, it is engineered for long-duty operation across demanding industrial plants, auditoriums, educational campuses, and commercial complexes.
Equipped with 6 low-impedance microphone inputs, 2 auxiliary audio inputs, and a dedicated 1V line input, the unit facilitates seamless audio mixing from standard dynamic microphones, audio playback sources, and upstream sound boards. Front-panel rotary potentiometers provide independent level balancing across all channels, alongside master volume regulation.
Tone shaping is handled via dedicated Bass and Treble equalization controls providing ±6 dB adjustment at 100 Hz and 10 kHz. An integrated Box Speaker / Driver Unit selector switch allows users to automatically defeat low-frequency bass boost when driving compression horn drivers, preventing driver diaphragm rupture during high-volume announcements.
Speaker output connectivity supports both low-impedance configurations at 4Ω and 8Ω for local cabinet installations, as well as 70V and 100V distributed constant-voltage line configurations for long-distance multi-speaker zoning without cable signal loss. Preamplifier (200mV) and Line (1V) outputs allow simple interconnection to recording hardware or downstream booster amplifiers.
Power security is provided by dual-supply capability: the amplifier runs on 220–240V AC mains and features automatic, instantaneous transfer to a 24V DC battery supply (requiring two external 12V car batteries (they are not included)) in the event of AC utility power interruption. Electrical protection includes an accessible rear-panel resettable circuit breaker protecting against short-circuits and thermal overload.

Product Information .

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

System Compatibility and Audio Interface Guidelines

The Ahuja SSA-250M public address mixer amplifier is engineered for versatile integration across industrial, commercial, and institutional sound distribution networks. Designed to accommodate a wide variety of audio sources, loudspeaker loads, and secondary power infrastructure, the unit provides standardized electrical matching across both low-impedance setups and high-voltage distributed line systems.

Audio Source and Front-End Input Compatibility

The mixer amplifier features nine dedicated input paths engineered to interface directly with dynamic microphones, line-level media players, and upstream audio processing gear without requiring external impedance matching transformers:

Microphone Inputs (Mic 1 to Mic 6): Rated at 0.65mV sensitivity with an input impedance of 4.7kΩ via standard 6.3mm phone jacks. These channels are compatible with standard low-impedance dynamic vocal and paging microphones.
Auxiliary Inputs (Aux 1 and Aux 2): Rated at 100mV sensitivity with a 470kΩ input impedance, suitable for line-level audio sources including CD players, media playback modules, radio tuners, and auxiliary audio processors.
Line Input: Rated at 1V with a 50kΩ input impedance. This dedicated input allows direct connection from commercial audio mixing consoles or permits the SSA-250M to function as a slave booster power amplifier driven by an upstream master mixer.

Loudspeaker Load Matching and Output Taps

The rear-panel terminal strip supports low-impedance voice-coil connections as well as high-voltage distributed line transmission. When configuring speaker networks, the total load must match the specified impedance or power budget:

Low-Impedance Direct Outputs (4Ω and 8Ω): Designed for direct connection of low-impedance cabinet loudspeakers. Connecting loads below 4Ω must be avoided to prevent triggering the internal protection circuitry.
Distributed Line Outputs (70V and 100V): Intended for long-distance multi-speaker networks utilizing line-matching transformers. The cumulative tapped wattage of all connected 70V or 100V ceiling speakers, column speakers, or horn speakers must not exceed the amplifier's rated capacity of 250W RMS.
Acoustic Transducer Selection: Features an integrated Box Speaker / Driver Unit selector switch. When driving compression driver horns, setting this switch to 'Driver Unit' automatically defeats low-frequency bass boost to safeguard driver diaphragms from mechanical damage.

Booster Expansion and Downstream Interconnections

For large-scale industrial plants or expansive outdoor venues requiring greater sound reinforcement than a single 250W unit can provide, the amplifier incorporates dedicated preamplifier and line output ports:

Preamplifier Output (200mV / 600Ω): Dedicated unbalanced output for routing preamplified master audio to external recording equipment.
Line Output (1V / 1kΩ): High-level feed designed to daisy-chain up to four Ahuja BR-250M booster power amplifiers, allowing system engineers to scale the installation into a unified 1250W mono public address distribution network.

Electrical Power and DC Backup Interfacing

The SSA-250M operates on standard 220–240V AC 50/60Hz utility power (consuming 460VA to 500VA). For continuous operation during utility outages, the unit includes 24V DC terminals designed for external battery connection (utilizing two 12V external car batteries (they are not included), drawing up to 6A under maximum load) with instantaneous automatic changeover upon AC mains failure.

Ahuja SSA-250M PA Amplifier Installation and Wiring Guidelines

Proper integration of the Ahuja SSA-250M public address mixer amplifier requires careful attention to load matching, input termination, electrical power provisioning, and transducer selection. Built with a heavy-duty steel metal chassis measuring 450 mm (W) × 160 mm (H) × 340 mm (D) and weighing 16.0 kg, this unit is engineered for stable rack shelf or tabletop industrial deployment.

AC Mains and 24V DC Battery Supply Integration

The amplifier is designed to operate on a standard 220–240V AC 50/60Hz mains supply (nominal 240V), drawing between 460VA and 500VA under typical operational loads. Connect the grounded AC power cord to a regulated, surge-protected industrial outlet.

For mission-critical paging installations requiring uninterrupted power, the rear terminal block supports an external 24V DC battery supply (two 12V car batteries in series (they are not included)) consuming up to 6A. The amplifier includes an internal automatic transfer relay that provides instantaneous changeover to connected external 24V DC batteries (they are not included) during AC utility interruptions without dropping audio output or resetting input channels.

Speaker Output Wiring & Load Impedance Matching

The rear-panel barrier screw terminal strip supports both low-impedance direct connections and high-impedance constant-voltage distributed speaker networks. Total speaker load must never exceed the 250W RMS rated capacity.

Low-Impedance Taps (4Ω and 8Ω): Connect conventional speaker cabinets directly across the COM (Common) terminal and either the 4Ω or 8Ω tap. Calculate total series/parallel network impedance prior to connection to ensure the net load matches the chosen terminal without falling below the minimum impedance rating.
Distributed Line Taps (70V and 100V): For commercial or industrial multi-speaker distributed systems spanning long cable distances, connect line matching transformers across COM and either 70V or 100V. Sum the primary wattage taps of all connected speakers; the cumulative wattage must not exceed 250W RMS.

Box Speaker vs. Driver Unit Selector Calibration

The SSA-250M features a dedicated rear-panel selector switch labeled 'Box Speaker / Driver Unit'. Set this switch to match the connected transducer type:

Driver Unit Mode: When powering horn reflex compression drivers, this setting automatically defeats low-frequency bass boost. This cuts out excessive sub-100Hz excursion and protects compression diaphragms against mechanical damage and voice coil burnout.
Box Speaker Mode: Utilized for wide-range cabinet speakers, column arrays, and ceiling speakers, enabling full 50Hz to 15,000Hz (±3dB) bandwidth response and full ±6dB bass/treble tone control adjustment at 100Hz and 10kHz.

Input Channels & Booster Amplifier Chaining

Terminate up to six dynamic microphones via the 6.3mm phone jacks (0.65mV / 4.7kΩ sensitivity). Line-level devices (media players, tuners) connect to Aux 1 or Aux 2 (100mV / 470kΩ). An external audio console can be patched into the dedicated 1V / 50kΩ Line Input.

To expand system output for large facilities, link the rear 1V / 1kΩ Line Output or 200mV / 600Ω Preamp Output to the line inputs of up to four Ahuja BR-250M booster power amplifiers, constructing a combined 1250W mono public address distribution system. In case of unexpected short circuits or terminal bridging, the rear-panel resettable thermal/magnetic circuit breaker trips automatically and can be manually reset once the fault is cleared.

Maintenance, Circuit Protection, and Operational Care for Ahuja SSA-250M

Circuit Protection and Overload Reset Procedure

The Ahuja SSA-250M public address amplifier incorporates an integrated rear-panel resettable thermal/magnetic circuit breaker designed to protect internal amplification stages from short circuits and severe load overshoots. Unlike traditional fuse-based architectures, this circuit protection mechanism eliminates the necessity for internal glass fuse replacement during standard operational faults.

If the amplifier shuts off output during operation due to thermal or electrical stress, technicians should immediately power off the unit at the main switch, isolate the speaker load lines, and inspect the rear panel. Allow the amplifier to cool down if thermal cut-off has occurred. Once the external fault or line short is cleared, press the rear-panel circuit breaker button firmly inward to restore electrical conductivity before repowering the system.

Acoustic Driver Protection and Switch Configuration

To prevent mechanical strain and diaphragm blowout on horn compression drivers, the rear panel features a dedicated Box Speaker / Driver Unit selector switch. Periodic verification of this physical switch setting is an essential operational maintenance task:

Driver Unit Mode: Select this position whenever the SSA-250M is connected to horn drivers. This setting automatically defeats the low-frequency bass boost (which delivers up to ±6dB equalization at 100Hz), attenuating destructive low-frequency excursions.
Box Speaker Mode: Use this position only when full-range acoustic wooden or plastic loudspeaker enclosures are wired to the terminal barrier strip.

Load Impedance and Distribution Line Verification

System stability requires routine impedance and load capacity audits across all connected speaker networks. When using the 70V or 100V line distribution outputs, calculate the sum of all transformer primary taps to ensure total demand does not exceed the 250W RMS continuous capacity of the amplifier. Overloading the line transformer array will cause distortion beyond acceptable total harmonic distortion (THD) limits (2% at 200W RMS, 5% at 220W RMS, 10% at 250W RMS) and trigger the circuit breaker.

For low-impedance configurations across the 4Ω or 8Ω rear screw terminals, use an audio impedance meter to confirm that the net load is matched and never drops below the 4Ω minimum threshold. Operating below 4Ω presents a virtual short-circuit condition to the output stage.

Power Supply and DC Backup Inspection

The SSA-250M operates on dual power topologies: standard 220–240V AC 50/60Hz mains (drawing 460VA to 500VA) and an external 24V DC battery supply consuming up to 6A. The amplifier includes an automatic, instantaneous changeover circuit that switches to 24V DC battery backup (using two 12V car batteries (they are not included)) in the event of AC utility power interruption.

Inspection Item	Operational Parameter	Maintenance Action
AC Operating Voltage	220–240V AC, 50/60Hz	Verify supply stability at the distribution outlet; ensure solid earth ground.
DC Battery Bank	24V DC (2 × 12V car batteries (they are not included))	Check terminal lugs for oxidation, check electrolyte levels, and verify 6A current supply capability.
Output Barrier Strip	4Ω, 8Ω, 70V, 100V terminals	Ensure screw terminals are torqued tightly without loose wire strands creating shorts.
Input Connectors	6 × Mic, 2 × Aux, 1 × Line	Clean 6.3mm and RCA jacks to maintain 60dB signal-to-noise ratio performance.

Chassis and Terminals Preventative Servicing

The steel metal housing measures 450 mm (W) × 160 mm (H) × 340 mm (D) with a chassis weight of 16.0 kg. Keep the ventilation louvers clear of dust, industrial particulates, and obstructions to maintain natural convective heat dissipation across internal power transistors.

Regularly inspect front-panel rotary potentiometers controlling the 6 Microphone, 2 Auxiliary, 1 Line, Master, Bass, and Treble (±6dB at 100Hz and 10kHz) stages. Clean potentiometer tracks using dry, non-conductive electrical contact cleaner if rotary adjustments exhibit audible noise or intermittent level drops.

Industrial, Commercial, and Institutional Applications

Industrial Plant Paging and Warehouse Voice Announcements

In manufacturing plants, logistics hubs, and heavy distribution centres, operational ambient noise requires robust, intelligible sound distribution. The Ahuja SSA-250M delivers a continuous 250W RMS audio output (up to 300W Max), making it an effective core mixer amplifier for facility-wide voice announcements, shift change signaling, and priority emergency paging.

By utilizing the built-in 70V and 100V line output taps, systems engineers can drive high-impedance distributed speaker horn networks over long cable runs without significant line loss. When driving reflex compression horns in outdoor yards or high-noise factory floors, setting the integrated 'Box Speaker / Driver Unit' selector switch to the Driver Unit position defeats bass boost to protect horn diaphragms from mechanical blowout caused by low-frequency energy.

Educational Institutions and Campus Audio Systems

The Ahuja SSA-250M is engineered to manage sound distribution across school and university campuses, general assembly halls, and lecture auditoriums. With 6 balanced/unbalanced microphone inputs (0.65mV / 4.7kΩ) alongside 2 auxiliary line inputs (100mV / 470kΩ), the unit allows multiple podium microphones, handheld transmitters, and background audio sources to be mixed simultaneously without requiring external mixing consoles.

Audio operators can fine-tune speech clarity and background music tone using the independent Bass and Treble equalization controls, which offer ±6dB adjustment at 100Hz and 10kHz across Mic 1 to 6 and Aux 1 & 2. The unit operates within a broad 50Hz to 15,000Hz (±3dB) frequency response with a 60dB signal-to-noise ratio, ensuring clear, intelligible acoustic coverage for spoken addresses and programmatic events.

Places of Worship, Auditoriums, and Multi-Zone Commercial Systems

Houses of worship, civic centres, and commercial facilities often require multi-microphone mixing coupled with zone amplification. The SSA-250M accommodates low-impedance acoustic speaker arrangements at 4Ω and 8Ω for near-field auditorium wall cabinets, as well as 70V/100V tapped line transformers for multi-room commercial audio distribution.

For facilities requiring larger audio distribution across multiple auditoriums or zones, the unit features a dedicated preamplifier output (200mV / 600Ω) for audio recording equipment and a 1V / 1kΩ line output. The line output allows system integrators to interconnect up to four Ahuja BR-250M booster power amplifiers, scaling the core mixer up to a combined 1250W mono public address infrastructure.

Continuous Operation and Emergency Evacuation Systems

Facilities requiring uninterrupted life-safety communication during power disruptions rely on the SSA-250M's dual-power capability. In standard operation, the amplifier runs on 220–240V AC (50/60Hz, 460VA–500VA). In the event of utility mains failure, the internal power supply instantly transfers operation to a 24V DC battery backup (using 2 × 12V car batteries (they are not included), 6A consumption).

This automatic changeover ensures that security personnel and facility managers maintain uninterrupted broadcasting capabilities during power outages, site maintenance, or industrial plant emergencies.

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