Chassis Placement and Physical Mounting
The Hitune HSSB-60EM public address mixer amplifier is engineered in a rigid black metal housing designed for tabletop, desk, or equipment shelf deployment within standard commercial audio consoles. The unit measures 350 mm in width, 120 mm in height, and 265 mm in depth, with a net weight of 7 kg. When positioning the amplifier, place it on a level, structurally sound surface capable of supporting its physical load. Maintain clear clearance around the top and side ventilation louvers of the metal chassis to prevent heat accumulation during continuous operation at its 65W RMS rated output (90W maximum).
Dual AC Mains and 12V DC Backup Power Wiring
The amplifier incorporates a dual-voltage power architecture supporting both alternating current and direct current sources. Connect the standard integrated power lead to a 220–240V AC (50/60 Hz) grounded supply circuit rated to accommodate the unit's 160VA AC power consumption. For mission-critical announcement facilities, places of worship, and educational PA installations requiring non-stop functionality, connect an external 12V DC car battery (they are not included) directly to the rear DC screw terminals, observing strict polarity. Under DC operation, current draw reaches up to 3A. The internal circuitry features an instant automatic transfer system that switches immediately from AC mains to the 12V DC battery (they are not included) without audio disruption in the event of an AC supply failure.
Audio Input Connections and Line Expansion
Source equipment connects directly to the dedicated front/rear interface terminals. The unit features four microphone inputs engineered for standard dynamic microphones using 6.5 mm jack connectors, configured with an input sensitivity of 0.65mV and an input impedance of 4.7kΩ. Line-level auxiliary playback devices (such as media players or CD decks) connect to the single Aux input rated at 100mV across 470kΩ impedance.
For multi-zone setups or recording integration, link the amplifier’s pre-amplifier line output (rated at 200mV / 600Ω) to the input of an external booster power amplifier or an archival audio recording console. This output passes pre-amplified signal prior to final power amplification, allowing flexible industrial audio distribution.
Loudspeaker Load Matching and Line Termination
The Hitune HSSB-60EM provides output taps supporting both low-impedance direct drive and high-voltage distributed speaker runs. When wiring low-impedance passive loudspeakers, connect standard speaker cable across the Common (COM) terminal and either the 4Ω, 8Ω, or 16Ω tap, ensuring the total combined loudspeaker network impedance precisely matches the selected amplifier terminal tap.
For distributed public address architectures spanning extensive distances or utilizing ceiling speakers and sound columns fitted with line-matching transformers (LMT), connect the speaker run across COM and the 100V line tap. Ensure the cumulative wattage tap settings of all connected 100V speakers do not exceed the 65W RMS rating of the amplifier. Output voltage regulation remains within ≤ 2 dB from no-load to full-load conditions at 1 kHz across the 50 Hz to 15,000 Hz operational frequency band.
| Terminal / Interface | Connector / Type | Electrical Specification | Primary Application |
|---|---|---|---|
| Mic 1 – 4 | 6.5 mm Jack | 0.65mV / 4.7kΩ | Dynamic wired microphones |
| Auxiliary (Aux) | RCA / 6.5 mm Jack | 100mV / 470kΩ | External audio media sources |
| Pre-Amplifier Out | Line Terminal | 200mV / 600Ω | Booster amplifier or recording decks |
| Low-Z Speaker Taps | Terminal Strip | 4Ω, 8Ω, 16Ω | Direct low-impedance speakers |
| High-Z Speaker Tap | Terminal Strip | 100V Distributed Line | Transformer-coupled multi-speaker lines |
| DC Power Input | Polarized Terminal | 12V DC (3A consumption) | External car battery (they are not included) |
Acoustic Calibration and Tone Control Setup
After completing all physical and electrical terminations, verify that all input volume controls are turned down before energizing the AC circuit. Calibrate individual microphone and auxiliary signal gain levels sequentially to achieve optimal dynamic headroom with a signal-to-noise ratio of 60 dB. Tailor frequency response to acoustic environment demands using the cut-type tone controls: the Bass control provides cut attenuation down to -10 dB at 100 Hz, while the Treble control offers attenuation down to -10 dB at 10 kHz to suppress high-frequency feedback and optimize vocal intelligibility.
