{"product_id":"contacta-sts-a31h-window-intercom-amplifier","title":"Contacta STS-A31H Window Intercom Amplifier","description":"\u003ccenter\u003e\u003cspan style=\"font-size: x-large;\"\u003e\u003cstrong\u003eContacta STS-A31H Window Intercom Amplifier\u003c\/strong\u003e\u003c\/span\u003e\u003c\/center\u003e\n\u003ccenter\u003e\u003ciframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/UtlaUMtLATk\" title=\"Contacta STS-A31H Window Intercom Amplifier\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen\u003e\u003c\/iframe\u003e\u003c\/center\u003e\n\u003cp\u003eThe Contacta STS-A31H is the standard open-duplex amplifier that ships with most Contacta window intercom kits, and it is available as a standalone unit for installers building custom systems or replacing a failed amplifier in an existing Contacta installation. Open-duplex operation lets both parties speak at the same time without the clipped, walkie-talkie feel of half-duplex systems, and constant-current hearing loop drive with an engineer-adjustable level lets the amplifier drive an IL-AE98 or IL-AE99 hearing loop aerial so customers with hearing aids in the T-coil position pick up the audio directly. The STS-A31H is compatible with all Contacta window intercom customer-side and staff-side hardware, plus the PS-55 power supply.\u003c\/p\u003e\n\u003cp\u003eThe amplifier's energy-saving green standby mode is engaged automatically, cutting power draw by up to 80% during periods with no active speech. A green and red LED column indicates power and status and helps installers calibrate levels during setup. Continuous self-testing means no specialized equipment is required to confirm functionality after installation, and an isolated audio line input or output can be specified (as a custom option, not available together) for interfacing the amplifier with a recording system.\u003c\/p\u003e\n\u003cp\u003eThe STS-A31H housing measures 1.57 inches tall, 4.53 inches wide, and 4.57 inches deep in matte black ABS plastic with a fine textured finish, so it mounts discreetly under a counter or inside a service cabinet. It runs on 12 to 14 volts DC through a 2.1 mm DC jack, drawing 100 mA typical in standby and 2 amps typical on speech peaks. The system is CE, RoHS, and WEEE compliant.\u003c\/p\u003e\n\u003cp\u003eIf you're not sure whether the STS-A31H is the right replacement or upgrade for your installation, please call us at 800-207-2259.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOpen-duplex communication (both parties can speak simultaneously)\u003c\/li\u003e\n\u003cli\u003eCompatible with all Contacta window intercom customer-side and staff-side hardware, plus the PS-55 power supply\u003c\/li\u003e\n\u003cli\u003eEnergy-saving green standby mode with up to 80% power saving\u003c\/li\u003e\n\u003cli\u003eConstant-current hearing loop drive with engineer-adjustable drive level (drives IL-AE98 or IL-AE99 hearing loop aerials)\u003c\/li\u003e\n\u003cli\u003eIsolated audio line input or output for interfacing to a recording system (custom, not available together)\u003c\/li\u003e\n\u003cli\u003eGreen and red LED column for power and status indication and level calibration\u003c\/li\u003e\n\u003cli\u003eContinuous self-testing (no specialized equipment required to confirm functionality)\u003c\/li\u003e\n\u003cli\u003ePush on \/ push off power switch (tact switch under membrane)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eStandards and Compliance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCE compliant\u003c\/li\u003e\n\u003cli\u003eRoHS compliant\u003c\/li\u003e\n\u003cli\u003eWEEE compliant\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePhysical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDimensions: 1.57\" H x 4.53\" W x 4.57\" D\u003c\/li\u003e\n\u003cli\u003eWeight: 0.22 lb\u003c\/li\u003e\n\u003cli\u003eConstruction: ABS plastic housing\u003c\/li\u003e\n\u003cli\u003eFinish: matte black, fine texture\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Data:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSupply voltage: 12-14 VDC via 2.1 mm DC jack\u003c\/li\u003e\n\u003cli\u003eQuiescent current: 100 mA typical\u003c\/li\u003e\n\u003cli\u003eOperating current: 2 A typical on speech peaks\u003c\/li\u003e\n\u003cli\u003eMicrophones: electret, 5V supply via 2.2K load resistor\u003c\/li\u003e\n\u003cli\u003eSpeaker output power: 2.5W RMS at 8 ohm \/ 4.4W RMS at 4 ohm\u003c\/li\u003e\n\u003cli\u003eHearing loop drive compliance: constant current, bounded by 4V RMS and 2A RMS\u003c\/li\u003e\n\u003cli\u003eTotal harmonic distortion: less than 5% (loop and speakers)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Contacta Inc","offers":[{"title":"Default Title","offer_id":41666104098874,"sku":"STS-A31H","price":357.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1147\/6518\/files\/STS-A31H-1.jpg?v=1790031870","url":"https:\/\/www.safeandvaultstore.com\/products\/contacta-sts-a31h-window-intercom-amplifier","provider":"Safe and Vault Store.com","version":"1.0","type":"link"}