{"product_id":"esx-qs-four-bt-4-channel-nano-amplifier-with-bluetooth-receiver","title":"ESX QS-FOUR-BT - 4 Channel Nano Amplifier with Bluetooth Receiver","description":"\u003cdiv class=\"clearfix colelem\" id=\"pu396839-17\"\u003e\n\u003cdiv class=\"clearfix grpelem\" id=\"u396839-17\" data-muse-uid=\"U396839\" data-muse-type=\"txt_frame\" data-ibe-flags=\"txtStyleSrc\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"clearfix colelem\" id=\"pu396845-21\"\u003e\n\u003cdiv class=\"clearfix grpelem\" id=\"u396845-21\" data-muse-uid=\"U396845\" data-muse-type=\"txt_frame\" data-ibe-flags=\"txtStyleSrc\"\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eEfficient Class D Amplifier with ultra-compact dimensions\u003cbr\u003eHeavy die-cast Heatsink with perfect cooling characteristics\u003cbr\u003eAuto Turn-On Function\u003cbr\u003eHigh Level Inputs with Error Protection System (EPS®)\u003cbr\u003eStart\/Stop Ready\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eRCA In- and Outputs (via Cable Connector)\u003cbr\u003eStereo RCA Output for e.g. active Subwoofers\u003cbr\u003eHPF\/LPF switchable\u003cbr\u003ePerfect for HD-Audio\u003cbr\u003eWith integrated Bluetooth Receiver\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e4-Channel Class D Plug+Play Nano Digital Amplifier\u003c\/li\u003e\n\u003cli\u003ewith integrated Bluetooth Receiver\u003c\/li\u003e\n\u003cli\u003e4 x 35\/45\/60 Watts RMS @ 4\/3\/2 Ω\u003c\/li\u003e\n\u003cli\u003e2 x 120 Watts RMS @ 4 Ω bridged\u003c\/li\u003e\n\u003cli\u003e2 x HPF\/LPF @ 80 Hz\u003c\/li\u003e\n\u003cli\u003eFrequency Range 10 Hz - 60 kHz\u003c\/li\u003e\n\u003cli\u003eDimensions 90 x 35 x 80 mm\u003c\/li\u003e\n\u003cli\u003eEfficiency up to 90%\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Infotext\"\u003eFollowing the great success of the extremely small sized \u003c\/span\u003e\u003cspan class=\"Infotext\" id=\"u396956-2\"\u003eQS-TWO\u003c\/span\u003e\u003cspan class=\"Infotext\"\u003e and \u003c\/span\u003e\u003cspan class=\"Infotext\" id=\"u396956-4\"\u003eQS-TWO-BT\u003c\/span\u003e\u003cspan class=\"Infotext\"\u003e 2-channel amplifiers with Bluetooth\u003c\/span\u003e\u003cspan class=\"Infotext superscript\"\u003e®\u003c\/span\u003e\u003cspan class=\"Infotext\"\u003e, ESX initially introduced the \u003c\/span\u003e\u003cspan class=\"Infotext\" id=\"u396956-8\"\u003eQS-FOUR\u003c\/span\u003e\u003cspan class=\"Infotext\"\u003e, an equally small yet powerful 4-channel version. The desire for a corresponding 4-channel version with Bluetooth was also evident, and ESX now offers it.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Infotext\"\u003eIt is now available in two versions, differing only in their ISO wiring harness. Both feature an integrated Bluetooth module – perfect for wireless audio streaming directly from your smartphone. This is a real highlight, especially for classic and vintage cars whose original radios lack Bluetooth functionality. Enjoy modern music convenience without having to replace the original factory radio. The classic look of the vehicle remains intact.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Infotext\"\u003eMeasuring just 90 x 35 x 80 mm, this ultra-compact Bluetooth amplifier delivers a robust 4 x 60 watts RMS. In the test in Car\u0026amp;amp Hifi issue 6\/2025\u003c\/span\u003e\u003cspan\u003e\u003ca class=\"nonblock\" href=\"https:\/\/www.esxaudio.de\/english\/assets\/qs-four-bt_ch.pdf\" data-href=\"upload:U390736\" target=\"_blank\"\u003e\u003cspan class=\"Infotext\" id=\"u396956-16\"\u003e\u003c\/span\u003e\u003c\/a\u003e\u003c\/span\u003e\u003cspan class=\"Infotext\"\u003e, it was awarded the \u003c\/span\u003e\u003cspan class=\"Infotext\" id=\"u396956-20\"\u003ePRACTICAL TIP\u003c\/span\u003e\u003cspan class=\"Infotext\"\u003e after its outstanding performance and impressed with an even higher output of 4 x 68 watts. And all this with an extremely low total harmonic distortion of just 0.008% (THD+N @ 5W) and excellent sound quality.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Infotext\"\u003eOnce connected, the \u003c\/span\u003e\u003cspan class=\"Infotext\" id=\"u396956-25\"\u003eESX QS-FOUR-BT\u003c\/span\u003e\u003cspan class=\"Infotext\"\u003e will amaze you. Even factory speakers can be improved in terms of sound. Often, the problem lies with the built-in radios, which simply don't deliver enough power. If you want to listen to music at a higher volume, the speakers distort. If you then think it's the speakers' fault, you're mistaken. Often, the distortion comes from the radio's built-in amplifier, which is operating at its limit. This is known as \"clipping.\" The only solution is an external amplifier.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"Infotext\"\u003eHowever, these are often quite large and require thick power cables to be connected to the battery. ESX developed the \u003c\/span\u003e\u003cspan class=\"Infotext\" id=\"u396956-30\"\u003eQS-FOUR\u003c\/span\u003e\u003cspan class=\"Infotext\"\u003e models specifically for this purpose, delivering over 4 x 60 watts RMS – significantly more power than conventional radio amplifiers. And all this with very low power consumption, minimal distortion, and state-of-the-art Class D technology.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"ESX","offers":[{"title":"Default Title","offer_id":56977198416258,"sku":null,"price":194.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1114\/3920\/files\/qs-four-bt_set_cc2eec66-c223-4478-9690-0fe6c7d663d2.jpg?v=1791893985","url":"https:\/\/www.crowncustomscaraudio.co.uk\/products\/esx-qs-four-bt-4-channel-nano-amplifier-with-bluetooth-receiver","provider":"Crown customs car audio","version":"1.0","type":"link"}