[mattfranklin]

Cool slide deck, novaman. I'll have to read more later. I remember touring the Donaldson company (filters and mufflers) as a student. To me the most trippy parts were being in the anechoic room and walking past an anechoic wall.

Originally Posted by aknovaman

Best description of the problem and easy solutions are found here:
https://ls1tech.com/forums/conversio...ps-solved.html

A bit of way down my post (reply #14) is a zipped spreadsheet. You can download and enter your parameters to determine side branch resonator length.


Mustang, and GM truck guys use Branch resonators and they work remarkably well.

There are 14 pages of theory but it definitely works.

http://www.performancetrucks.net/for...ne-fix-424169/


For all you engineer types, begin reading at about page 41 of this document:

http://www.enoisecontrol.com/related...rrier_wall.pdf