Ahuja BTA-550 Interface, Signal, and Power Compatibility

The Ahuja BTA-550 (KT Automation Ref: KTI14006001A550) 30W portable trolley PA amplifier system is engineered for versatile signal integration across industrial, commercial, and field environments. Designed with multiple input stages, wireless transmission modules, and dedicated line-level interconnects, the system integrates seamlessly with standard wired microphones, auxiliary line sources, digital storage formats, and external sound reinforcement gear.

Wired and Wireless Microphone Input Interoperability

The amplifier includes multi-channel microphone connectivity designed to match standard commercial audio equipment:

• Wired Microphones (Mic-1 and Mic-2): Two independent 6.35 mm (1/4-inch) mono phone jack inputs with an input sensitivity of 4mV and an impedance rating of 4.7kΩ. These channels accept standard low-impedance dynamic wired microphones for facility briefings, training sessions, and announcements.
• Integrated Wireless Channel: Built-in quartz-controlled fixed-frequency wireless receiver paired with a handheld transmitter operating at 15mW maximum RF output. The wireless transmitter operates across a 50 Hz to 15,000 Hz frequency response and achieves a line-of-sight operational range exceeding 20 meters in open space. The transmitter requires 2 x 1.5V AA cells.
• Mic Priority Integration: Built-in voice-activated priority circuit automatically ducks background auxiliary and digital media audio when active signal is detected on Mic-1 or the wireless microphone channel.

Auxiliary, Instrument, and Digital Media Source Compatibility

For external media players, audio workstations, and electronic instruments, the unit features flexible input routing:

• Aux / Guitar Input: A dedicated 6.35 mm (1/4-inch) jack with 100mV sensitivity and 47kΩ impedance. This accepts unbalanced line-level signals from external mixers, audio players, laptops, and musical instruments such as acoustic-electric guitars.
• Digital Media Formats: Built-in MP3 player module compatible with standard USB flash storage drives and MMC/TF memory cards. The integrated controller also supports an audio recording function directly to connected flash storage.
• Wireless Audio Streaming: Integrated Bluetooth receiver module enables cable-free audio playback from compatible Bluetooth-enabled computers, tablets, and smartphones.
• Control Interface: Compatible with the supplied IR (infrared) remote control for navigating digital media tracks and source modes.

Line-Level Output and Slave System Expansion

For facilities requiring expanded sound dispersion or signal archiving, the Ahuja BTA-550 provides an analog Line Output:

• Line Out Port: Delivers a nominal 775mV line-level audio signal. This port enables direct interconnection with downstream slave PA amplifiers, active booster speakers, external mixing consoles, or dedicated industrial recording hardware without causing signal impedance mismatching or distortion.

Electrical Power Supply and DC Source Compatibility

The BTA-550 supports tri-mode power connectivity for continuous plant operation or off-grid deployment:

• AC Mains Power: Operates on standard AC 220V–240V at 50/60Hz with a power consumption rating of 50VA. AC protection is governed by a standard 1 Amp 250V (T 1A L) glass fuse.
• External DC Battery Input: Dedicated 12V DC input terminal socket allows connection to an external 12V automotive/car battery for remote field operations.
• Internal Rechargeable Battery: Integrated 11.1V 2200mAh (2.2Ah) Lithium-ion battery pack with an integrated auto cut-off circuit to safeguard against deep discharge cycles.

Interface Specifications Overview