The Ahuja TZA-2000 2-Zone Public Address Mixer Amplifier is engineered for rack, shelf, or tabletop deployment in commercial, industrial, and institutional sound environments. Given the amplifier's physical footprint of W500 × H140 × D340 mm and a net chassis weight of 17.4 kg, mounting platforms must be structurally rated to support heavy audio equipment. Ensure adequate clearance around the chassis perimeter to maintain natural air circulation across internal power stages during sustained operation.
Dual-Zone Speaker Wiring and Impedance Matching
The TZA-2000 features independent output terminal strips for Zone 1 and Zone 2, allowing systems integrators to configure low-impedance or high-impedance constant-voltage speaker lines independently per zone. Each zone delivers up to 130W Max (100W RMS at 10% THD) with voltage regulation maintained at ≤ 2 dB from no load to full load at 1kHz. Available speaker connection options include:
- Low-Impedance Connections (4Ω or 8Ω): Used for direct loudspeaker connections over short cable runs. Connect the speaker load to the COM terminal and either the 4Ω or 8Ω tap. Total combined impedance per zone must strictly match the selected output tap.
- High-Impedance Distributed Lines (70V or 100V): Engineered for multi-speaker distributed networks utilizing Line Matching Transformers (LMT). Connect the distributed line between COM and the 70V or 100V tap. The cumulative wattage rating of all connected transformer taps in a zone must not exceed the amplifier zone rating (100W RMS).
- Hybrid Dual-Zone Configurations: Integrators can deploy 100V LMT speakers on Zone 1 (such as factory floor column/ceiling speakers) while driving low-impedance 4Ω or 8Ω speakers on Zone 2 (such as local monitor speakers), or drive 100V / low-impedance lines across both zones simultaneously.
Input and Line-Level Signal Interfacing
Audio source connections are terminated at the amplifier's input stage according to source signal levels:
- Microphone Inputs: Up to 6 mono microphones (input sensitivity 0.6mV / 4.7kΩ impedance) can be patched directly into the front/rear mixing section.
- Auxiliary & Line Inputs: Two dedicated Aux inputs (100mV / 470kΩ) and one Stereo L/R input (250mV / 47kΩ) accommodate background music players, media units, or external mixer outputs.
- Preamp and Line Outputs: The Preamp output (200mV / 600Ω) and Line output (1V / 1kΩ) allow routing mixed signals to external recording systems or slave booster amplifiers without overloading input circuits.
Mains and 24V DC Emergency Power Setup
The amplifier is designed for dual-source power operation. Connect the primary power lead to a 220–240V AC 50/60Hz single-phase supply (power consumption 420VA). For uninterruptible industrial communication, connect an external 24V DC source consisting of two 12V car batteries (they are not included) drawing up to 6.5A. In the event of an AC utility failure, the internal switching circuitry initiates an instant, automatic transfer to 24V DC battery operation. Rear-panel DC fuses protect internal DC distribution circuitry; ensure replacements strictly match the original manufacturer ratings.
