The Hitune HTZA-4000EM (TZA-4000EM) dual-zone PA mixer amplifier is engineered to interface with broad commercial public address, background music, and professional paging network architectures. System integrators can deploy the amplifier across dual independent audio zones or integrate it into consolidated mono and stereo sound distribution setups requiring distinct zone volume calibration.
Loudspeaker Load and Distributed Line Architecture
The amplifier features dedicated output taps for each of its two operational zones, accommodating both direct low-impedance voice-coil loads and constant-voltage distributed speaker networks. Installers can match loudspeaker configurations using the following zone output options:
- Low-Impedance Connections: Dedicated 4Ω and 8Ω terminal taps per zone allow direct connection of low-impedance commercial sound reinforcement cabinets, industrial horn speakers, or monitor enclosures.
- Distributed Line Taps (70V and 100V): High-voltage multi-speaker lines operate on 70V or 100V line taps per zone. This facilitates long cable runs with stepped-down transformer-coupled ceiling speakers, column speakers, and industrial projector horns without excessive line loss.
- Zone Isolation: The two zones can be deployed independently (e.g., dividing indoor acoustic spaces from outdoor industrial yards) with independent power delivery up to 200W + 200W RMS (at 10% THD) and maximum capability of 300W + 300W Max. Output voltage regulation remains ≤ 2 dB from no-load to full-load conditions at 1 kHz.
Input Signal Compatibility and Impedance Matching
The mixer stage provides dedicated input impedance and sensitivity ratings engineered to accept dynamic paging microphones, consumer playback equipment, and balanced or unbalanced line-level broadcast feeds:
- Microphone Channels: Six mono microphone inputs with 0.6mV sensitivity and 4.7kΩ input impedance, suitable for standard low-impedance dynamic announcement microphones and industrial push-to-talk stations.
- Auxiliary Inputs: Two auxiliary inputs rated at 100mV sensitivity and 470kΩ impedance, facilitating connection to media players, tuners, or automation sound modules.
- Stereo Input: Stereo L/R input rated at 200mV across a 100kΩ load, supporting playback systems, professional media playback decks, and DJ audio programmes.
- Line Input: Line L/R inputs rated at 1V sensitivity with 50kΩ impedance, accommodating direct line-level signals from external mixing desks, preamplifiers, or audio routers.
Preamplifier and Auxiliary Signal Routing
For modular expansion across multi-amplifier commercial installations, the HTZA-4000EM incorporates preamplifier and line-level loop outputs:
- Preamp Output: Rated at 200mV into 600Ω, allowing signal extraction prior to the internal power amplification stage for routing into external audio processors, recording equipment, or signal monitoring hardware.
- Line Output: Delivers 1V into 1kΩ, enabling daisy-chain connections to secondary booster amplifiers or slave PA power units without signal degradation.
Operational Modes and Frequency Calibration
The HTZA-4000EM supports Stereo Music Operation for stereo sound sources such as DJ programmes, as well as a Mono mode that permits simultaneous dual-group loudspeaker driving. Master acoustic contouring provides frequency response compatibility across 50 Hz to 15,000 Hz (±3 dB) with an overall signal-to-noise ratio of 60 dB. Integrated tone adjustments offer ±10 dB Bass correction at 100 Hz and ±10 dB Treble correction at 10 kHz.
Electrical Mains and DC Battery Interfacing
Designed for mission-critical industrial installations requiring uninterrupted communication, the unit supports primary and secondary power supply sources:
- AC Mains Power: Operates on standard 220–240V AC at 50/60 Hz, drawing a maximum power consumption of 700VA.
- DC Auxiliary Backup: Operates on a 24V DC backup circuit drawing 9A DC, compatible with two external 12V car batteries (they are not included). This dual-source compatibility maintains public address continuity during mains outages.
