{"id":4576,"date":"2015-04-12T19:08:23","date_gmt":"2015-04-12T18:08:23","guid":{"rendered":"http:\/\/www.bartola.co.uk\/valves\/?p=4576"},"modified":"2015-04-12T19:11:16","modified_gmt":"2015-04-12T18:11:16","slug":"sound-card-interface-revisited","status":"publish","type":"post","link":"https:\/\/www.bartola.co.uk\/valves\/2015\/04\/12\/sound-card-interface-revisited\/","title":{"rendered":"Sound Card interface (revisited)"},"content":{"rendered":"

For \u00a0measuring my system, I was struggling with not having a floating USB sound card to use with Pete Millett’s interface. I found a cheap alternative (Focusrite Scarlett 2i2<\/a>) which can do ASIO 96kHZ and 24-bit.<\/p>\n

\"focusrite<\/a><\/p>\n

Above is the response with internal loopback at 1Vrms on the 2Vrms scale of the SC interface.The distortion is really good below 0.01% just above 25Hz:<\/p>\n

\"focusrite<\/a><\/p>\n

With the balanced input and outputs the noise level is really low. Below -120dB mostly across the entire 20Hz – 50kHz band. Inband noise level is below 100uV when the DAC volume is at highest level and the ASIO generator is muted:\"focusrite<\/a><\/p>\n

For distortion testing this USB audio interface has a very good oscillator output performance. Check out the 100mV level below:
\n\"focusrite<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

For \u00a0measuring my system, I was struggling with not having a floating USB sound card to use with Pete Millett’s interface. I found a cheap alternative (Focusrite Scarlett 2i2) which can do ASIO 96kHZ and 24-bit. Above is the response with internal loopback at 1Vrms on the 2Vrms scale of the SC interface.The distortion is … Continue reading “Sound Card interface (revisited)”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[67],"tags":[737,738,735,525,734,736,229],"class_list":["post-4576","post","type-post","status-publish","format-standard","hentry","category-thd","tag-focusrite","tag-focusrite-scarlett-2i2","tag-measuring-distortion-in-valve-audio-amplifiers","tag-pete-millets-soundcard-interface","tag-sc-interface","tag-thd-in-valve-amplifiers","tag-thd-measurement"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2r2tK-1bO","jetpack_likes_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/4576","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/comments?post=4576"}],"version-history":[{"count":3,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/4576\/revisions"}],"predecessor-version":[{"id":4583,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/4576\/revisions\/4583"}],"wp:attachment":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/media?parent=4576"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/categories?post=4576"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/tags?post=4576"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}