{"id":24387,"date":"2009-11-17T00:50:16","date_gmt":"2009-11-17T08:50:16","guid":{"rendered":"http:\/\/9n2.ac0.myftpupload.com\/presetblog\/?p=1004"},"modified":"2009-11-17T00:50:16","modified_gmt":"2009-11-17T08:50:16","slug":"diy-12-to-2-passive-analog-summing-panel","status":"publish","type":"post","link":"https:\/\/ericbeam.com\/?p=24387","title":{"rendered":"DIY – 16×2 – Passive Analog Summing Panel."},"content":{"rendered":"

\"DSC_0317\"<\/a><\/p>\n

Update : increased the channels from 12 to 16 (16×2)<\/span><\/p>\n

Made myself a nice little passive summing panel for my home rig out of parts lying around the shop. I wanted to simplify\/improve my final summing stage. Pleased with the results, Sounds great. Gives me piece of mind bypassing the channel IC’s & master section on my desk.<\/p>\n

I used a simple XLR panel, Neutrik XLR mounts, Neve super conductive cable, & OHMITE 1% metal film resistors. Took all of 2 hours to wire up.<\/p>\n

10.7k resistors on the inputs & a 220 shunt on the outputs.<\/p>\n

After level calibration my noise-floor is at -80 & crosstalk @ -88 (via – John Hardy M1 & or API-A2D transformer pre for the make up gain. Nothing better IMHO.).<\/p>\n

 <\/p>\n

\n

My design is based on the mixing network in NYD\u2019s drawing.
\nhttp:\/\/www.twin-x.com\/groupdiy\/albums\/userpics\/balancedmixnetwork.pdf<\/a><\/p>\n

All you have to do is figure out how many channels you need. Pick an input impedance value. Modern balanced gear has a high input impedance usually around 20k. I picked 21.4kohm, only because I had \u201cmilitary grade\u201d resistors on hand that happened to be 10.7k.
\nResistors between 5k-15k should work well for most applications. 10k input resistors work well.<\/p>\n

Now for output impedance most mic pres want to see 150ohm signal.
\nI recommend using a transformer based pre for the make up gain that accepts a wide range of impedance, like the hardy.
\nYou should pick your shunt resistors on the outputs to spit out around 150ohm. Mine is 200 something. But the hardy can easily handle anything from 60-600ohm<\/p>\n

The formula to figure out the output shunt resistor value for a 200ohm output with an input impedance of 20k =<\/p>\n

shunt ohm resistor = (20000\/n)*200\/((20000\/n)-200) FYI \u2013 google is a great calculator<\/p>\n

WHERE N = NUMBER OF INPUTS<\/p>\n<\/div>\n\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":1007,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_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_post_was_ever_published":false},"categories":[5,10],"tags":[23,40,59,115],"class_list":["post-24387","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hardware","category-ticks-tips-tricks","tag-analog","tag-diy","tag-jogn-hardy-m1","tag-summing","excerpt","zoom","full-without-featured","even","excerpt-0"],"jetpack_featured_media_url":"https:\/\/ericbeam.com\/wp-content\/uploads\/2009\/11\/DSC_0309.jpg","jetpack-related-posts":[{"id":24437,"url":"https:\/\/ericbeam.com\/?p=24437","url_meta":{"origin":24387,"position":0},"title":"Summing experiment","author":"Eric","date":"December 12, 2010","format":false,"excerpt":"[text ]The never-ending question ITB vs OTB summing. I'm an advocate for analog processing no doubt, So in turn analog summing is convenient. But in terms of summing alone without processing..?? The question is still up in the air. As an experiment I'd like to see what is preferred after\u2026","rel":"","context":"In "Analysis"","block_context":{"text":"Analysis","link":"https:\/\/ericbeam.com\/?cat=3"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":24466,"url":"https:\/\/ericbeam.com\/?p=24466","url_meta":{"origin":24387,"position":1},"title":"DIY – RM-5 Ribbon Mic Build","author":"Eric","date":"May 2, 2012","format":false,"excerpt":"So a few weeks back I snagged this ribbon mic kit over at www.diyrecordingequipment.com Really simple nice sounding mic. Highly recommend Artur\u2019s \"official\" retail RM-5 for anyone looking to get their hands on one of these. After it was wired up, I pulled a few coworkers into a booth to\u2026","rel":"","context":"In "Hardware"","block_context":{"text":"Hardware","link":"https:\/\/ericbeam.com\/?cat=5"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/ericbeam.com\/wp-content\/uploads\/2012\/05\/6991295952_5c6bda6ce1_c.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/ericbeam.com\/wp-content\/uploads\/2012\/05\/6991295952_5c6bda6ce1_c.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/ericbeam.com\/wp-content\/uploads\/2012\/05\/6991295952_5c6bda6ce1_c.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":24395,"url":"https:\/\/ericbeam.com\/?p=24395","url_meta":{"origin":24387,"position":2},"title":"Inside the Hardy M1","author":"Eric","date":"April 12, 2010","format":false,"excerpt":"Beautiful design & Sound.","rel":"","context":"In "Hardware"","block_context":{"text":"Hardware","link":"https:\/\/ericbeam.com\/?cat=5"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/ericbeam.com\/wp-content\/uploads\/2010\/04\/DSC_0045.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/ericbeam.com\/wp-content\/uploads\/2010\/04\/DSC_0045.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/ericbeam.com\/wp-content\/uploads\/2010\/04\/DSC_0045.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/ericbeam.com\/wp-content\/uploads\/2010\/04\/DSC_0045.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/ericbeam.com\/wp-content\/uploads\/2010\/04\/DSC_0045.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/ericbeam.com\/wp-content\/uploads\/2010\/04\/DSC_0045.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":24454,"url":"https:\/\/ericbeam.com\/?p=24454","url_meta":{"origin":24387,"position":3},"title":"Phono 2 DI\/Instrument Preamp Cable Build","author":"Eric","date":"January 4, 2012","format":false,"excerpt":"Need to listen\/capture from vinyl? Are you questioning the quality of that dusty 1970's phono receiver you found in the basement? If\u00a0you're a musician, it's likely you have a highend Pre\/Audio interface at your disposal. With minimal cost & effort you can use the Hi-Z instrument gain stage as a\u2026","rel":"","context":"In "Hardware"","block_context":{"text":"Hardware","link":"https:\/\/ericbeam.com\/?cat=5"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/ericbeam.com\/wp-content\/uploads\/2012\/01\/6517507025_c69cf89d82_o.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/ericbeam.com\/wp-content\/uploads\/2012\/01\/6517507025_c69cf89d82_o.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/ericbeam.com\/wp-content\/uploads\/2012\/01\/6517507025_c69cf89d82_o.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/ericbeam.com\/wp-content\/uploads\/2012\/01\/6517507025_c69cf89d82_o.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/ericbeam.com\/wp-content\/uploads\/2012\/01\/6517507025_c69cf89d82_o.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/ericbeam.com\/wp-content\/uploads\/2012\/01\/6517507025_c69cf89d82_o.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":24448,"url":"https:\/\/ericbeam.com\/?p=24448","url_meta":{"origin":24387,"position":4},"title":"Sum Comparison","author":"Eric","date":"September 14, 2011","format":false,"excerpt":"Got my hands on a pair of JCF LEVRs. I wanted to see how they compare to my usual \"go to\" API 312 for makeup gain after the folcrom. After a week of pulling my hair out trying to get the LEVRs to play nice with my setup, (more on\u2026","rel":"","context":"In "Analysis"","block_context":{"text":"Analysis","link":"https:\/\/ericbeam.com\/?cat=3"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":24391,"url":"https:\/\/ericbeam.com\/?p=24391","url_meta":{"origin":24387,"position":5},"title":"Dripidy","author":"Eric","date":"March 13, 2010","format":false,"excerpt":"Got distracted before hitting the shower this morn by the ever so quiet sound of\u00a0 this. Drip Loop One Drip Loop One Drip Loop Two Drip Loop Two Four measures @ 76bpm Drip Loop One 24\/96 .wav Drip Loop Two 24\/96 .wav Drip Loop One Original 24\/96 .wav Drip Loop\u2026","rel":"","context":"In "Daily Noize"","block_context":{"text":"Daily Noize","link":"https:\/\/ericbeam.com\/?cat=4"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/ericbeam.com\/wp-content\/mediaarchive\/wp-content\/uploads\/2010\/03\/4429485199_d08cde9c42.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/ericbeam.com\/index.php?rest_route=\/wp\/v2\/posts\/24387","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ericbeam.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ericbeam.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ericbeam.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ericbeam.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=24387"}],"version-history":[{"count":0,"href":"https:\/\/ericbeam.com\/index.php?rest_route=\/wp\/v2\/posts\/24387\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ericbeam.com\/index.php?rest_route=\/wp\/v2\/media\/1007"}],"wp:attachment":[{"href":"https:\/\/ericbeam.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=24387"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ericbeam.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=24387"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ericbeam.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=24387"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}