AXYS OpSTImizer® a PC based measurement and equalisation tool, our engineers measure STI using the STIPA method. However, In contrast to most handheld STIPA measurement devices on the market, we can enter the background noise spectrum directly into the OpSTImizer®. There is no need for data export and post-processing in a spreadsheet, so we are able to evaluate the sound system's performance, under various noise conditions whilst on site.