Green : TDA1541a + SRC4192<\/span><\/li>\n<\/ul>\n![\"\"](\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2026\/05\/FFT-Spectrum-_-NOS-vs-SRC4192-vs-SAA7220p_AB-1-kHz-0dBr-_-Philips-110-Low-Pass-Filter.png\")
<\/p>\n
Linear Scale – FFT : 256k 50x AVG – NOS vs TDA1541a + SAA7220p_A<\/p>\n
![\"\"](\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2026\/05\/FFT-Spectrum-_NOS-vs-SAA7220p_A-1-kHz-0dBr-_-Philips-110-Low-Pass-Filter-Linear.png\")
<\/p>\n
Linear Scale – FFT : 256k 50x AVG – NOS vs TDA1541a + SAA7220p_B<\/p>\n
![\"\"](\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2026\/05\/FFT-Spectrum-_NOS-vs-SAA7220p_B-1-kHz-0dBr-_-Philips-110-Low-Pass-Filter-Linear.png\")
<\/p>\n
Linear Scale – FFT : 256k 50x AVG – NOS vs TDA1541a + SRC4192<\/p>\n
![\"\"](\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2026\/05\/FFT-Spectrum-_NOS-vs-SRC4192-1-kHz-0dBr-_-Philips-110-Low-Pass-Filter-Linear.png\")
<\/p>\n
Linear Scale – FFT : 256k 50x AVG – NOS vsTDA1541a + SAA7220p_A&B vs TDA1541a + SRC4192<\/p>\n
![\"\"](\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2026\/05\/FFT-Spectrum-_NOS-vs-SAA7220p_AB-vs-SRC4192-1-kHz-0dBr-_-Philips-110-Low-Pass-Filter-Linear.png\")
<\/p>\n","protected":false},"excerpt":{"rendered":"
I hear and read that there is some unrest regarding my NOS measurement. \ud83d\ude09 , this time with -110 dB Low Pass Filer CD player output followed by Philips -110 dB Low Pass Filter\u00a0...<\/p>\n","protected":false},"author":1,"featured_media":18673,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,121,307,260],"tags":[],"class_list":["post-18661","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-measurement","category-philips","category-saa7220","category-tda1541"],"yoast_head":"\n
TDA1541A NOS versus OS with Philips -110 dB Low Pass Filter - Bram Jacobse<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.bramjacobse.nl\/wordpress\/?p=18661\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"TDA1541A NOS versus OS with Philips -110 dB Low Pass Filter - Bram Jacobse\" \/>\n<meta property=\"og:description\" content=\"I hear and read that there is some unrest regarding my NOS measurement. \ud83d\ude09 , this time with -110 dB Low Pass Filer CD player output followed by Philips -110 dB Low Pass Filter\u00a0...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.bramjacobse.nl\/wordpress\/?p=18661\" \/>\n<meta property=\"og:site_name\" content=\"Bram Jacobse\" \/>\n<meta property=\"article:published_time\" content=\"2026-05-13T07:48:28+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-13T08:36:20+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2026\/05\/os-nos-100db.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"1148\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Bram\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Bram\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.bramjacobse.nl\\\/wordpress\\\/?p=18661#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.bramjacobse.nl\\\/wordpress\\\/?p=18661\"},\"author\":{\"name\":\"Bram\",\"@id\":\"https:\\\/\\\/www.bramjacobse.nl\\\/wordpress\\\/#\\\/schema\\\/person\\\/046607e546e3a7190b34f7793abbe6fe\"},\"headline\":\"TDA1541A NOS versus OS with Philips -110 dB Low Pass Filter\",\"datePublished\":\"2026-05-13T07:48:28+00:00\",\"dateModified\":\"2026-05-13T08:36:20+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.bramjacobse.nl\\\/wordpress\\\/?p=18661\"},\"wordCount\":308,\"publisher\":{\"@id\":\"https:\\\/\\\/www.bramjacobse.nl\\\/wordpress\\\/#\\\/schema\\\/person\\\/046607e546e3a7190b34f7793abbe6fe\"},\"image\":{\"@id\":\"https:\\\/\\\/www.bramjacobse.nl\\\/wordpress\\\/?p=18661#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.bramjacobse.nl\\\/wordpress\\\/wp-content\\\/uploads\\\/2026\\\/05\\\/os-nos-100db.jpeg\",\"articleSection\":[\"Measurement\",\"Philips\",\"SAA7220\",\"TDA1541\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.bramjacobse.nl\\\/wordpress\\\/?p=18661\",\"url\":\"https:\\\/\\\/www.bramjacobse.nl\\\/wordpress\\\/?p=18661\",\"name\":\"TDA1541A NOS versus OS with Philips -110 dB Low Pass Filter - 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