{"product_id":"sp-91-calibrators","title":"SP 91 Calibrators","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\u003cp\u003eThe SP 91 Acoustic Pulse Source is a hand-operated impulse device built for RT60 reverberation time measurements in small to medium-sized rooms and echoey spaces up to approximately 200 m² (600 m³). Its purely mechanical, wood-based construction requires no batteries or external power, making it a reliable and eco-friendly alternative to balloon-based impulse sources. The device produces a broadband acoustic pulse exceeding 125 dB(C) peak sound level at 1 metre in semi-free field conditions, ensuring sufficient signal-to-noise ratio across the audible frequency range. It is well-suited for building acoustics assessments, room acoustic surveys, and educational demonstrations. Each unit ships with hearing protection and a lightweight carrying bag for easy field deployment.\u003c\/p\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePeak SPL \u0026gt;125 dB(C) at 1 m\u003c\/li\u003e\n\u003cli\u003eBroadband spectrum\u003c\/li\u003e\n\u003cli\u003eRoom coverage up to 200 m² \/ 600 m³\u003c\/li\u003e\n\u003cli\u003eMechanical operation (no batteries)\u003c\/li\u003e\n\u003cli\u003eWeight ~2.27 kg\u003c\/li\u003e\n\u003cli\u003eDimensions 300×150×100 mm\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eApplications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBuilding acoustics\u003c\/li\u003e\n\u003cli\u003eReverberation time (RT60) measurement\u003c\/li\u003e\n\u003cli\u003eRoom acoustic surveys\u003c\/li\u003e\n\u003cli\u003eEducational demonstrations\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eStandards \u0026amp; Certifications\u003c\/h2\u003e\u003cp\u003e\u003c\/p\u003e","brand":"Svantek","offers":[{"title":"Default Title","offer_id":53677776142609,"sku":null,"price":0.0,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0870\/4140\/9297\/files\/SP91_side.jpg?v=1781611173","url":"https:\/\/absolute-instrument.com\/products\/sp-91-calibrators","provider":"Absolute-Instrument-Systems","version":"1.0","type":"link"}