This is a basic guide on how to calibrate multiple subwoofers in a home theater by optimizing positioning, levels, delay, bass management, and EQ using a FREE measurement system called REW to help guide you towards making the best calibration decisions. Dayton Audio UMM-6 USB Microphone: https://www.parts-express.com/dayton-audio-umm-6-usb-measurement-microphone--390-808 15ft HDMI Cable: https://amzn.to/2V07jIT To get access to unique Audioholics content become a Patron at: https://www.patreon.com/audioholics For the full written review, please visit: https://www.audioholics.com/home-theater-calibration/bass-optimization-for-home-theater Follow us on: FACEBOOK https://www.facebook.com/Audioholics GOOGLE PLUS https://plus.google.com/+Audioholics TWITTER https://twitter.com/AudioholicsLive