C-MEDIA CM6206 5.1 External Laptop USB Audio Sound Card Line-In Low Bass Frequency Response Upgrade

*THE PROBLEM* C-MEDIA CM6206 is a cheap and solid performance audio codec chip supporting 16 bit / 48 kHz audio, stereo MIC and LINE-IN inputs. Great for hobby recordings & measurements, despite the fact it has only 16 bit A/D converters and 48 kHz sampling rate! 99.999% of humans can't hear the difference between standard 16 bit / 44.1 kHz and 24 bit / 192 kHz audio anyway. However, the manufacturers crippled LINE-IN analog recording inputs frequency response in low / bass section by putting very small coupling capacitors! Why oh why ??? CM6206 hardware is perfectly capable going all the way down to a sub-hertz (less than 1 Hz) flat frequency response if desired / required. You can even bypass input AC coupling capacitors to enable DC input, with some precaution (useful for audio oscilloscope applications and DC signal measurements). C-MEDIA CM6206 audio codec is used in many different sound cards, including 7.1 surround models. It supports separate Headphone output, mute, rec mute, digital volume controls, dual mono MICROPHONE inputs and more! Of course, in this 5.1 model not all features are used, but what can you expect from a $10 or $15 sound card? More expensive $20 / $30 models come with 7.1 audio, dedicated headphones output, dual MIC and LINE-IN inputs, Volume and Mute controls. In essence, a very solid audio card for the money! In this video I have upgraded input coupling capacitors with larger values and improved frequency response considerably! Used SMD...