The Ahuja ABA-4000 is a 325W RMS 2-way bi-amplified active loudspeaker designed for versatile integration in commercial PA systems, live performance stages, mini-theatres, religious prayer halls, and mobile touring setups. Proper mechanical mounting, signal routing, and electrical connection ensure stable performance across all deployment scenarios.
Mechanical Mounting and Physical Placement
The heavy-duty moulded plastic enclosure of the Ahuja ABA-4000 (measuring 385 mm in width, 585 mm in height, and 305 mm in depth, with a total weight of 20.80 kg) supports multiple installation formats:
- Pole and Stand Mounting: Mount the loudspeaker onto standard speaker stands or sub-poles utilizing the integrated speaker stand mounting socket located on the bottom of the moulded cabinet. Ensure the stand tripod base is fully spread and secured on a level surface to support the 20.80 kg enclosure safely.
- Floor Standing Deployment: Position the unit directly on a flat, stable surface for front-of-house reinforcement in mini-theatres, auditoriums, pubs, or community halls.
- Floor Wedge Monitoring: Orient the speaker enclosure on its side angle for stage foldback and artist monitoring during live vocal and musical performances.
Audio Input Wiring and Gain Configuration
The active electronics feature two discrete input channels to accommodate various source devices without requiring external preamplification:
- Input 1 (Mic / Line Input): Terminated in a balanced female XLR connector. Select the appropriate sensitivity via the rear-panel push switch: Mic (20 mV / 3 kΩ sensitivity) for dynamic or externally powered condenser microphones, or Line (775 mV / 10 kΩ sensitivity) for line-level signals from mixers or audio interfaces.
- Input 2 (Aux / Line Input): Equipped with a balanced 6.3 mm (1/4") line jack (250 mV / 20 kΩ) for stage consoles, keyboards, and instruments, alongside parallel unbalanced dual RCA stereo inputs (250 mV L&R / 10 kΩ) for media players, laptops, and DJ mixers. Use balanced TRS connections for extended cable runs to minimize ground hum.
- Level and Tone Calibration: Adjust channel volume knobs to achieve nominal acoustic output. Monitor the dedicated Clip LED indicator; steady or frequent illumination indicates signal clipping in the Class H (LF 275W RMS) or Class AB (HF 50W RMS) internal power amplifier modules and requires reducing input gain. Adjust active Bass (±5 dB at 100 Hz) and Treble (±5 dB at 10 kHz) equalization controls to tailor the 50 Hz to 20,000 Hz acoustic profile to room acoustics.
Signal Daisy-Chaining and Output Routing
The Ahuja ABA-4000 includes a balanced male XLR line output to facilitate multi-speaker system expansions:
- Loop Through Mode: Routes an isolated copy of Input 1 (20 mV Mic or 775 mV Line) directly to downstream active speakers or recording equipment.
- Mixed Output Mode: Sums Input 1 and Input 2 (775 mV / 1 kΩ) to feed master signals to slave active loudspeakers, delay-fill towers, or external active subwoofers.
Mains Electrical Integration and Safety
Connect the unit to a regulated single-phase AC mains supply rated at 220–240 V AC, 50/60 Hz (power consumption: 375 VA). When operating on portable generator power, ensure the generator line voltage is fully stabilized before powering on the loudspeaker to prevent voltage spikes. Overcurrent protection is maintained by one AC fuse (T 4A L) and two internal DC fuses (T 6A L); replacements must strictly match these specified ratings.
