{"id":14809,"date":"2026-03-12T17:23:19","date_gmt":"2026-03-12T16:23:19","guid":{"rendered":"https:\/\/www.amplificazionilombardi.it\/?post_type=product&#038;p=14809"},"modified":"2026-03-13T11:48:37","modified_gmt":"2026-03-13T10:48:37","slug":"ll2c-4-4-canali-optical-audio-limiter-sound-limiter-for-clubs","status":"publish","type":"product","link":"https:\/\/www.amplificazionilombardi.it\/en\/shop\/ll2c-4-4-canali-optical-audio-limiter-sound-limiter-for-clubs\/","title":{"rendered":"LL2C-4 CHANNEL OPTICAL AUDIO LIMITER \u2013 SOUND LIMITER FOR PREMISES"},"content":{"rendered":"<p data-start=\"1452\" data-end=\"1633\">The LL2C-4 audio limiter has been designed to provide <strong data-start=\"1506\" data-end=\"1588\">high audio quality, operational safety and long-term stability of the settings<\/strong>, preventing any tampering after calibration.<\/p>\n<p data-start=\"1635\" data-end=\"1728\">The device features <strong data-start=\"1655\" data-end=\"1690\">four independent audio channels<\/strong>, each with dedicated adjustments for:<\/p>\n<ul data-start=\"1730\" data-end=\"1785\">\n<li data-section-id=\"1b0vhbc\" data-start=\"1730\" data-end=\"1745\">\n<p data-start=\"1732\" data-end=\"1745\">input level<\/p>\n<\/li>\n<li data-section-id=\"sn7gwx\" data-start=\"1746\" data-end=\"1762\">\n<p data-start=\"1748\" data-end=\"1762\">output level<\/p>\n<\/li>\n<li data-section-id=\"1gx2zu\" data-start=\"1763\" data-end=\"1785\">\n<p data-start=\"1765\" data-end=\"1785\">limiting threshold<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1787\" data-end=\"1940\">All adjustments are located <strong data-start=\"1815\" data-end=\"1834\">inside the unit<\/strong> and are performed via internal trimmers, preventing accidental or intentional changes after installation.<\/p>\n<p data-start=\"1942\" data-end=\"2118\">All <strong data-start=\"1946\" data-end=\"2016\">audio connections through connectors are also made inside the unit<\/strong>, increasing installation security and preventing unauthorized modifications or bypass of the limiter.<\/p>\n<p data-start=\"2120\" data-end=\"2301\">If the unit is switched off using the power switch located on the rear panel, the audio signal is <strong data-start=\"2218\" data-end=\"2244\">completely interrupted<\/strong>, ensuring that <strong data-start=\"2260\" data-end=\"2300\">no bypass of the limiter is possible<\/strong>.<\/p>\n<p data-start=\"2303\" data-end=\"2558\">The level control is achieved through an <strong data-start=\"2344\" data-end=\"2376\">analog resistive optocoupler<\/strong>, without the use of VCA circuits.<br data-start=\"2410\" data-end=\"2413\" \/>This technical solution provides a <strong data-start=\"2448\" data-end=\"2507\">more natural, progressive and musical limiting behavior<\/strong>, minimizing audible artifacts in the audio signal.<\/p>\n<p data-start=\"2560\" data-end=\"2793\">Installed in a standard <strong data-start=\"2584\" data-end=\"2606\">19&#8243; rack enclosure<\/strong>, the LL2C-4 limiter is particularly suitable for audio systems where it is necessary to control <strong data-start=\"2703\" data-end=\"2750\">multiple audio lines or zones independently<\/strong> while maintaining excellent sound quality.<\/p>\n<p data-start=\"2795\" data-end=\"2967\">Its smooth and progressive limiting response makes it ideal both for <strong data-start=\"2864\" data-end=\"2892\">protecting audio systems<\/strong> and for <strong data-start=\"2901\" data-end=\"2966\">sound level limitation in venues subject to noise regulations<\/strong>.<\/p>\n<hr data-start=\"2969\" data-end=\"2972\" \/>\n<h1 data-section-id=\"1duzgra\" data-start=\"2974\" data-end=\"2996\">AVAILABLE VERSIONS<\/h1>\n<p data-start=\"3032\" data-end=\"3175\">The LL2C-4 optical audio limiter is available in several configurations to meet different installation and sound level management requirements.<\/p>\n<p data-start=\"3177\" data-end=\"3375\">All versions share the same analog optical limiting circuit of the LL2C-4 base model and maintain the same professional audio quality, while differing in the way the limiting thresholds are managed.<\/p>\n<hr data-start=\"3377\" data-end=\"3380\" \/>\n<h2 data-section-id=\"1y4wl2t\" data-start=\"3382\" data-end=\"3425\">Version 1 \u2013 LL2C-4 Standard (base model)<\/h2>\n<p data-start=\"3427\" data-end=\"3484\">This is the standard version of the LL2C-4 audio limiter.<\/p>\n<p data-start=\"3486\" data-end=\"3620\">The unit features <strong data-start=\"3504\" data-end=\"3542\">one limiting threshold per channel<\/strong>, adjustable via internal trimmers during system installation and calibration.<\/p>\n<p data-start=\"3622\" data-end=\"3727\">Input level, output level and threshold adjustments are located <strong data-start=\"3686\" data-end=\"3705\">inside the unit<\/strong> to prevent tampering.<\/p>\n<p data-start=\"3729\" data-end=\"3860\">This configuration is ideal for installations where a <strong data-start=\"3783\" data-end=\"3812\">fixed maximum sound level<\/strong> is required on four independent audio channels.<\/p>\n<hr data-start=\"3862\" data-end=\"3865\" \/>\n<h2 data-section-id=\"mq76b\" data-start=\"3867\" data-end=\"3928\">Version 2 \u2013 LL2C-4 with key-controlled threshold selection<\/h2>\n<p data-start=\"3930\" data-end=\"4028\">This version allows the configuration of <strong data-start=\"3971\" data-end=\"4027\">three different limiting thresholds for each channel<\/strong>.<\/p>\n<p data-start=\"4030\" data-end=\"4229\">The thresholds can be selected through a <strong data-start=\"4071\" data-end=\"4123\">mechanical key switch located on the front panel<\/strong>, allowing the venue manager to choose between different pre-configured sound levels set by the installer.<\/p>\n<p data-start=\"4231\" data-end=\"4300\">This solution is particularly useful where it is necessary to manage:<\/p>\n<ul data-start=\"4302\" data-end=\"4419\">\n<li data-section-id=\"1xc0alw\" data-start=\"4302\" data-end=\"4327\">\n<p data-start=\"4304\" data-end=\"4327\"><strong data-start=\"4304\" data-end=\"4327\">daytime sound level<\/strong><\/p>\n<\/li>\n<li data-section-id=\"1jxzg6s\" data-start=\"4328\" data-end=\"4355\">\n<p data-start=\"4330\" data-end=\"4355\"><strong data-start=\"4330\" data-end=\"4355\">nighttime sound level<\/strong><\/p>\n<\/li>\n<li data-section-id=\"11tnten\" data-start=\"4356\" data-end=\"4419\">\n<p data-start=\"4358\" data-end=\"4419\"><strong data-start=\"4358\" data-end=\"4419\">temporary higher level for authorized acoustic exemptions<\/strong><\/p>\n<\/li>\n<\/ul>\n<p data-start=\"4421\" data-end=\"4535\">The three thresholds are calibrated during system setup and can then be selected using the front panel key switch.<\/p>\n<hr data-start=\"4537\" data-end=\"4540\" \/>\n<h2 data-section-id=\"uwe2y2\" data-start=\"4542\" data-end=\"4594\">Version 3 \u2013 LL2C-4 with web controller management<\/h2>\n<p data-start=\"4596\" data-end=\"4732\">This version includes a <strong data-start=\"4620\" data-end=\"4662\">web-based controller with Wi-Fi access<\/strong>, allowing remote configuration and management of the limiting levels.<\/p>\n<p data-start=\"4734\" data-end=\"4752\">The system allows:<\/p>\n<ul data-start=\"4754\" data-end=\"4976\">\n<li data-section-id=\"1ybrzuq\" data-start=\"4754\" data-end=\"4810\">\n<p data-start=\"4756\" data-end=\"4810\">automatic management of <strong data-start=\"4780\" data-end=\"4810\">day and night sound levels<\/strong><\/p>\n<\/li>\n<li data-section-id=\"1t42680\" data-start=\"4811\" data-end=\"4854\">\n<p data-start=\"4813\" data-end=\"4854\">configuration of <strong data-start=\"4830\" data-end=\"4854\">temporary exemptions<\/strong><\/p>\n<\/li>\n<li data-section-id=\"wldk4j\" data-start=\"4855\" data-end=\"4912\">\n<p data-start=\"4857\" data-end=\"4912\">scheduling of permitted levels using a <strong data-start=\"4896\" data-end=\"4912\">web calendar<\/strong><\/p>\n<\/li>\n<li data-section-id=\"1g60cvk\" data-start=\"4913\" data-end=\"4976\">\n<p data-start=\"4915\" data-end=\"4976\">generation of a <strong data-start=\"4931\" data-end=\"4976\">history log of all changes and operations<\/strong><\/p>\n<\/li>\n<\/ul>\n<p data-start=\"4978\" data-end=\"5010\">Two user profiles are available:<\/p>\n<p data-start=\"5012\" data-end=\"5113\"><strong data-start=\"5012\" data-end=\"5037\">Administrator profile<\/strong><br data-start=\"5037\" data-end=\"5040\" \/>managed by the installer, with full configuration and programming access.<\/p>\n<p data-start=\"5115\" data-end=\"5217\"><strong data-start=\"5115\" data-end=\"5131\">User profile<\/strong><br data-start=\"5131\" data-end=\"5134\" \/>intended for the venue manager, allowing data viewing and authorized level control.<\/p>\n<p data-start=\"5219\" data-end=\"5355\">This solution is particularly suitable for installations requiring <strong data-start=\"5286\" data-end=\"5354\">automated sound level management and traceability of adjustments<\/strong>.<\/p>\n<hr data-start=\"5357\" data-end=\"5360\" \/>\n<h2 data-section-id=\"1t058ls\" data-start=\"5362\" data-end=\"5418\">Version 4 \u2013 LL2C-4 with web controller and key switch<\/h2>\n<p data-start=\"5420\" data-end=\"5530\">This version combines the <strong data-start=\"5446\" data-end=\"5475\">web controller management<\/strong> with the <strong data-start=\"5485\" data-end=\"5529\">mechanical key switch on the front panel<\/strong>.<\/p>\n<p data-start=\"5532\" data-end=\"5569\">The limiter can therefore be managed:<\/p>\n<ul data-start=\"5571\" data-end=\"5630\">\n<li data-section-id=\"1yafvnj\" data-start=\"5571\" data-end=\"5596\">\n<p data-start=\"5573\" data-end=\"5596\">via <strong data-start=\"5577\" data-end=\"5596\">web programming<\/strong><\/p>\n<\/li>\n<li data-section-id=\"1dzht7q\" data-start=\"5597\" data-end=\"5630\">\n<p data-start=\"5599\" data-end=\"5630\">or via <strong data-start=\"5606\" data-end=\"5630\">manual key selection<\/strong><\/p>\n<\/li>\n<\/ul>\n<p data-start=\"5632\" data-end=\"5746\">providing maximum flexibility in installations where both remote management and local manual control are required.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p data-start=\"461\" data-end=\"605\">LL2C-4 is a <strong data-start=\"473\" data-end=\"521\">professional 4-channel optical audio limiter<\/strong> designed to control sound levels while preserving the highest audio signal quality.<\/p>\n<p data-start=\"607\" data-end=\"839\">Thanks to its fully analog circuitry and the control system based on a <strong data-start=\"678\" data-end=\"703\">resistive optocoupler<\/strong>, the limiter provides <strong data-start=\"726\" data-end=\"783\">smooth, progressive and almost imperceptible limiting<\/strong>, preserving the natural character of the audio program.<\/p>\n<p data-start=\"841\" data-end=\"1045\">Unlike many traditional limiters based on VCA or digital processing, LL2C-4 uses a <strong data-start=\"924\" data-end=\"962\">fully analog signal control system<\/strong>, ensuring a more musical and transparent response even when the limiter is active.<\/p>\n<p data-start=\"1047\" data-end=\"1385\">The modern electronic design, the use of <strong data-start=\"1088\" data-end=\"1121\">selected low-noise components<\/strong>, and the careful quality control of the assembly process provide the LL2C-4 limiter with <strong data-start=\"1211\" data-end=\"1274\">high reliability, stability and excellent audio performance<\/strong>, making it suitable for professional applications where multiple audio channels must be managed independently.<\/p>\n","protected":false},"featured_media":14820,"template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[137],"product_tag":[],"class_list":{"0":"post-14809","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-limiters","8":"first","9":"instock","10":"sale","11":"taxable","12":"shipping-taxable","13":"purchasable","14":"product-type-variable"},"acf":[],"_links":{"self":[{"href":"https:\/\/www.amplificazionilombardi.it\/en\/wp-json\/wp\/v2\/product\/14809","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.amplificazionilombardi.it\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.amplificazionilombardi.it\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.amplificazionilombardi.it\/en\/wp-json\/wp\/v2\/media\/14820"}],"wp:attachment":[{"href":"https:\/\/www.amplificazionilombardi.it\/en\/wp-json\/wp\/v2\/media?parent=14809"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.amplificazionilombardi.it\/en\/wp-json\/wp\/v2\/product_brand?post=14809"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.amplificazionilombardi.it\/en\/wp-json\/wp\/v2\/product_cat?post=14809"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.amplificazionilombardi.it\/en\/wp-json\/wp\/v2\/product_tag?post=14809"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}