Below you can download the demo-version of ENC 4.1. It is fully working but is reset to default every 60 s.
Download the demo-version here: Enc_demo.zip (21 Mb)
Download Software manual of ENC v4_3 with references to the fourth edition of "Engineering Noise Control" by Bies and Hansen. (Acrobat format, Jan 2015)
Download the release notes of version 4.3 here: Release notes v4.3.pdf