{"product_id":"rdl-st-hp3","title":"RDL ST-HP3 – 300 Hz and 500 Hz High Pass Filter","description":"\u003ch2\u003eWhat is the RDL ST-HP3?\u003c\/h2\u003e\u003cp\u003eThe RDL ST-HP3 is a line-level high pass filter that protects public address horn loudspeakers from low-frequency damage. It sits at the input of a power amplifier and needs no field adjustment.\u003c\/p\u003e\u003ch2\u003eHow does it work?\u003c\/h2\u003e\u003cp\u003e\u003cimg src=\"https:\/\/rdlnet.com\/wp-content\/uploads\/2024\/01\/st-hp3.jpg\" alt=\"RDL ST-HP3 300 Hz and 500 Hz High Pass Filter\" style=\"max-width:100%;height:auto\" loading=\"lazy\"\u003e\u003c\/p\u003e\u003cp\u003eThe ST-HP3 has one balanced +4 dBu input and two filtered outputs, 300 Hz high pass and 500 Hz high pass, which may be used simultaneously. The 300 Hz output is -3 dB at 225 Hz and the 500 Hz output is -3 dB at 450 Hz, both with an 18 dB\/octave attenuation curve. The module runs at unity gain, and input and outputs may be wired unbalanced if required. SupplyFlex power accepts ground-referenced, floating or bipolar 24 Vdc at 30 mA, such as from the \u003ca href=\"https:\/\/creationnetworks.net\/products\/rdl-ps-24ax\"\u003eRDL PS-24AX\u003c\/a\u003e. The module measures 3 in. W x 1.6 in. D x 0.7 in. H.\u003c\/p\u003e\u003ch2\u003eWhat are the key features?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHorn loudspeaker protection\u003c\/strong\u003e — Low frequencies are removed before they reach horn drivers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo filtered outputs\u003c\/strong\u003e — 300 Hz and 500 Hz high pass outputs are available at the same time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e18 dB\/octave slope\u003c\/strong\u003e — A steep curve attenuates unwanted low frequencies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo field adjustment\u003c\/strong\u003e — Fixed filters simplify installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupplyFlex power input\u003c\/strong\u003e — It runs from ground-referenced, floating or bipolar 24 Vdc.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"RDL","offers":[{"title":"Default Title","offer_id":68025796296940,"sku":"ST-HP3","price":178.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0603\/7982\/4364\/files\/st-hp3.jpg?v=1793583957","url":"https:\/\/creationnetworks.net\/products\/rdl-st-hp3","provider":"Creation Networks","version":"1.0","type":"link"}