Master Console Site Setup and Power Configuration
The Hitune Bass SBS-20 master station is engineered with a rigid metal enclosure designed for stationary desktop installation within a central administrative facility, such as a principal's or headmaster's office. Ensure the placement area provides adequate structural support, unobstructed access to the front-panel controls, and sufficient clearance for rear-panel cabling interfaces. Installation personnel must prepare dual-path electrical infrastructure to utilize the console's redundant power architecture. The unit supports primary operation from a standard 230V AC mains utility supply as well as auxiliary operation via a 12V DC power source. Terminate the electrical feeds through dedicated, properly rated power connectors to ensure uninterrupted school broadcasting and emergency paging functionality.
Audio Input and Microphone Configuration
The console comes equipped with a factory-attached electret gooseneck microphone delivering an input sensitivity rating of 2.1 mV/Pa. Position the flexible gooseneck to accommodate the seated operator's direct speech axis to capture balanced voice audio across the system's full 50 Hz to 18,000 Hz operating frequency response range. For installations requiring an auxiliary or remote speech station, identify the optional rear-panel external microphone socket. Connect compatible high-impedance or low-impedance external microphones directly into this dedicated port, ensuring audio cabling is shielded from adjacent AC power lines to prevent induced electromagnetic hum and interference.
100V Line Matching and External Power Amplifier Integration
The SBS-20 operates as a 20-zone central control and talkback distribution hub that requires integration with an external public address power amplifier. Line-matching speaker distribution methodology must be implemented across all output lines. System integrators must calculate the required power rating of the external power amplifier based strictly on the aggregate electrical load, determined by the total number of classroom speaker units and their collective line-matching transformer wattage taps. Route the master pre-amplified output signals from the console into the external power amplifier's line inputs, and route the high-voltage distributed speaker feed through the console's internal zone-switching relays using line-matching principles to preserve signal integrity across extended institutional cable runs.
20-Zone Field Wiring and Classroom Talkback Termination
Establish discrete two-wire or multi-conductor field cable runs connecting each of the 20 individual zone outputs to their respective classroom speaker stations. The console architecture enables selective two-way communication between the central administration and up to 20 individual remote rooms. Maintain correct line-matching polarity at each speaker station to ensure uniform acoustic phase across all classrooms. Terminate the call-return signaling conductors from each remote classroom station back to the designated zone switch terminals on the SBS-20 rear panel, ensuring low-resistance continuity for return signaling and incoming voice reception.
Commissioning Procedures and Operational Verification
Following cable termination, complete a systematic commissioning check across the entire 20-zone network:
- Power Initialization: Energize the console via the 230V AC mains line or 12V DC input; verify console power indicators.
- Zone Selector and Talk LED Verification: Depress each individual zone selector switch sequentially; confirm that the corresponding Talk LED illuminates on the console interface when voice transmission is initiated via the electret gooseneck microphone.
- Return Signaling and Monitoring: Trigger a call-back transmission from each remote classroom station; verify that the Return Call Bell chimes distinctly and the associated Call Return LED lights up on the front panel.
- Monitor Speaker Calibration: Adjust the independent rotary monitor speaker volume control to calibrate incoming classroom audio through the console's integrated monitor speaker without introducing feedback.
- All-Call Broadcast Test: Engage the master 'All Call' switch to verify simultaneous, distortion-free public address distribution across all 20 connected zones across the rated 50–18,000 Hz spectrum.
