STS-A31H

Contacta STS-A31H - Speech Transfer Amplifier

The Contacta STS-A31H is a professional amplifier designed for speech transfer systems used at counters, booths, and desks where communication occurs through glass. It enables full open duplex communication, allowing simultaneous speaking and listening, and is compatible with all Contacta speech transfer products.

The amplifier features an energy-saving “green” standby mode that reduces power consumption by up to 80%. It includes a LED column indicator for status and adjustment feedback, and continuous self-testing ensures reliable operation without the need for specialized diagnostic equipment. Factory options allow for isolated line-level audio input or output for integration with recording systems.

Functionality:

• full duplex communication - simultaneous speech transmission
• energy-saving standby mode - up to 80% power reduction
• isolated audio input/output - optional integration with recording systems
• LED column indicator - visual feedback for status and setup
• continuous self-testing - no diagnostic equipment required
• compatible with electret microphones - 5V supply via 2.2kΩ resistor
• compliant with EMC, LVD, WEEE, RoHS directives - safe and reliable

Features:

• supply voltage: 12-14V DC
• quiescent current: 100mA typical
• operating current: 2A typical on speech peaks
• speaker output: 2.5W / 8Ω, 4.4W / 4Ω
• loop drive: constant current, bounded by 4V RMS & 3A RMS
• THD: <5% (loop and speakers)
• dimensions: 116x115x40mm
• weight: 100g
• construction: ABS plastic
• finish: matt black fine texture
• power connector: 2.1mm DC jack
• compliant with BS EN60118-4 (induction loop performance)

The Contacta STS-A31H is a dependable amplifier for AV professionals, offering efficient, high-quality speech transfer in customer service environments.