The Ahuja BTA-660 / BTA-660M Portable Active PA Trolley Speaker System is engineered for cross-platform integration across professional audio sources, wired and wireless voice inputs, digital storage media, and versatile power infrastructures. Designed for multi-scenario deployment, the unit accepts balanced line-level feeds, dynamic analog microphone connections, broadcast-grade RF voice transmission, and digital media streaming.
Audio Source and Media Player Compatibility
The integrated digital media subsystem supports multiple input formats and external playback hardware. For wireless transmission, the built-in Bluetooth receiver interfaces with mobile and desktop operating systems, enabling audio streaming from Bluetooth-compatible smartphones, tablets, laptops, and dedicated media players. For physical digital storage, the onboard digital MP3 player features direct read and recording functionality compatible with USB flash storage drives and SD/MMC solid-state memory cards. System operation can be managed locally on the rear chassis or remotely via the included infrared (IR) remote control.
Microphone and Signal Input Interfacing
The BTA-660 provides dedicated analog and RF input channels designed for speech reinforcement, musical accompaniment, and presentation mixing:
- Wired Microphones: Two independent wired microphone channels rated at 4 mV sensitivity with 4.7 kΩ input impedance, interfacing via standard 6.35 mm (1/4-inch) TS mono jack connectors for standard dynamic microphones.
- Wireless Microphones: Built-in quartz-controlled fixed frequency VHF dual-channel receiver paired with two handheld wireless transmitters. The RF wireless system operates with a maximum RF output power of 10 mW, delivering a frequency response of 50 Hz to 15,000 Hz and maintaining stable line-of-sight voice pickup across operational distances exceeding 20 meters. Each transmitter is powered by two standard 1.5V AA cells.
- Line and Music Inputs: One Aux line input (100 mV / 47 kΩ) and one Music input (100 mV / 47 kΩ) configured for analog stereo audio sources such as CD players, outboard mixing consoles, multimedia computers, and line-level instruments via 3.5 mm and RCA connections.
- Voice Priority ducking: Mic-1 channel incorporates a selectable auto-ducking priority circuit that automatically overrides auxiliary and background music inputs when active speech is detected.
Preamp Output and System Linking
For audio distribution and cascading into larger sound reinforcement networks, the unit includes an analog Preamp Output rated at 200 mV with 600 Ω source impedance. This output allows system operators to route the master mixed audio signal directly into secondary active loudspeakers, central venue PA systems, external audio recorders, or downstream amplifier channels without signal degradation.
Electrical and Power Supply Compatibility
The BTA-660 features a three-way power architecture allowing continuous operation across fixed facilities and remote field installations:
| Power Source Option | Input Specification | Operational Notes / Protection |
|---|---|---|
| AC Utility Mains | 220V–240V AC, 50/60 Hz (50 VA) | Protected by user-replaceable 1A 250V (T 1A L) glass cartridge fuse |
| Internal Battery | 12V 7Ah Sealed Lead-Acid (SLA) | Integrated deep-discharge auto cut-off circuit and LED charging status indicators |
| External DC Battery | 12V DC input terminals | Compatible with external 12V automotive batteries and inverter DC banks via terminal posts |
| Transmitter Power | 2 x 1.5V AA cells per mic | Supports standard 1.5V AA alkaline or rechargeable dry cells (140 g transmitter weight without cells) |
