SPL Compensator and Graph Download the Excel Document HERE, (Microsoft Excel needed) [33kb] 1. Explains how to use a Radio Shack SPL meter to record frequency response. 2. Enter in numbers, view adjusted measurements and 3 different graphs. 3. Enter in room dimensions and find out ALL standing waves for that room and what to do with them. Please let me know if I should revise it/make changes or any sugggestions. Soon I'll be building HH resonator bass traps and acoustic paneling so I might as well make a page that has plenty of pics & how to make them.