{"id":24572,"date":"2016-08-26T11:14:54","date_gmt":"2016-08-26T18:14:54","guid":{"rendered":"http:\/\/9n2.ac0.myftpupload.com\/?p=6241"},"modified":"2016-08-26T11:14:54","modified_gmt":"2016-08-26T18:14:54","slug":"will-that-lunchbox-sound-different","status":"publish","type":"post","link":"https:\/\/ericbeam.com\/?p=24572","title":{"rendered":"Will that other Lunchbox sound different?"},"content":{"rendered":"

I recently got into a debate that triggered a call for analysis. Are lunchbox PSU’s\/Shielding drastically different between products? Curiosity got the best of me and had to find out. I use three different manufactures myself API, BAE, & RND. Being all respected brands I wasn’t expecting to see drastic differences. Two of three have built-in PSU’s and thought that might have some impact.
\n<\/p>\n

For the test I used a Api 512c mic-pre set to amplify a – 40 dBu signal up to 13 dBu. Figured this would give a good opportunity for some noise\/interference to sneak in. For a 2nd comparison I used the very clean Grace 502. I used it amplify a – 9 dBu signal up to 13 dBu.<\/p>\n

The results showed little to no audible difference between these boxes. Below are the measurement plots of the experiment. The minute gain differences are do to manual knob adjustment.<\/p>\n