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Getting Started with REW A Step-by-Step Guide (Rev 5.43, June 3, 2017)

Getting Started with REW: A Step-by-Step Guide (Rev 5.43, June 3, 2017) Contents Introduction .................................................................................................................................................. 4 Hardware/Operating System ........................................................................................................................ 4 Using REW on Different Operating Systems ............................................................................................. 5 Using REW on Apple Macintosh Computers ............................................................................................. 5 A special note for Windows 10 users ........................................................................................................ 6 Configuring Windows Audio Playback Devices ........................................................................................... 11 Configuring Windows Audio Recording Devices ......................................................................................... 20 Installing and Configuring REW ................................................................................................................... 28 Step 1: Downloading and installing the latest beta version of REW ...................................................... 28 Step 2: Downloading and installing ASIO4ALL Software ........................................................................ 30 Step 3a: REW Software Configuration (ASIO and HDMI Connections) .................................................. 33 ASIO Troubleshooting ......................................................................................................................... 41 Step 3b: REW Software Configuration (Java without HDMI Connection).............................................. 44 Step 4: REW Sound Card Calibration ...................................................................................................... 46 Step 5: REW Microphone Calibration .................................................................................................... 47 USB Microphones with Sensitivity parameters: Special Considerations ........................................... 52 Notes on the accuracy of USB mic calibration files with sensitivity parameter ................................. 56 Notes on factory microphone gain setting (UMIK-1) .......................................................................... 59 Taking REW Measurements ........................................................................................................................ 60 Generating Waterfall Graphs ...................................................................................................................... 71 Generating Spectrograms ........................................................................................................................... 76 Generating Decay Graphs ........................................................................................................................... 79 Generating Energy-Time Curve (ETC) Graphs ............................................................................................. 82 Generating Distortion Graphs ..................................................................................................................... 89 Generating Impulse Response Measurements ........................................................................................... 91 Using REW to Generate EQ Filters .............................................................................................................. 95 Measurement Guidelines ............................................................................................................................ 99 Additional Measurement Guidelines (courtesy of Jevansoh) ............................................................... 103 Taking Pre-Out measurements with REW ................................................................................................ 105 Using REW to Set or Measure Speaker Levels .......................................................................................... 111 Page 2 of 132

Getting Started with REW: A Step-by-Step Guide (Rev 5.43, June 3, 2017) Time-Aligning Speakers using REW Impulse Measurements .................................................................... 117 A Note on SBIR .......................................................................................................................................... 126 Publishing Graphs ..................................................................................................................................... 127 Revision History ........................................................................................................................................ 129 Credits ................................................................................................................................................... 132 Page 3 of 132

Getting Started with REW: A Step-by-Step Guide (Rev 5.43, June 3, 2017) Introduction The purpose of this document is to provide a step-by-step guide for novice users of Room Equalization Wizard (REW), freeware audio measurement software authored by John Mulkahy. This guide focuses on the recent enhancements to REW that support the use of USB microphones and HDMI connectivity. You are encouraged to visit the REW forum, and to thoroughly read the REW Online Help documents. Hardware/Operating System To conduct measurements with REW following this guide, you will need: 1. A computer (preferably a laptop or a netbook) running the Windows operating system or a MacBook. While most of the examples given in this document pertain to Windows computers, there are links to advice specific to Mac users. 2. A sound pressure level (SPL) meter (optional). 3. A USB microphone (currently either the UMM-6 or the UMIK-1). 4. A stand for the microphone (preferably a boom mic stand). 5. An appropriate suite of cables and connectors, as specified later in this document. This document was developed using a typical Windows dual-core laptop. The chipset/video is an ATI Radeon Mobile HD 4200, and the audio is a typical RealTeK chip. The laptop is patched current, which is always important. Always check to make sure the chipset drivers are current, as well as the audio drivers. Normally, running Windows Update will ensure the latest supported (i.e. non-beta) drivers are installed. Note: The two USB mic’s can be purchased directly from the vendor (MiniDSP for the UMIK-1, or Dayton Audio for the UMM-6), in which case you can download a single calibration file from the vendor’s web site. However, this calibration file is for a zero-degree orientation. Both mics are also available from Cross-Spectrum Labs, which runs a custom calibration for each mic they sell. The mics are provided with several calibration files, including a 90-degree calibration file, which is the angle used for most REW measurements. Does it make a difference which type of calibration files you have? Check out this post (post 4926), which provides measurement data comparing the various calibration files available for the mic’s. Thanks to the research by AVS member Manni01, you can download a file from the MiniDSP Forum here that will generate a 90-degree calibration file from your 0-degree file. Tests have shown that the generated calibration file matches the custom files from CSL very closely. To see a comparison showing the differences between the web-site calibration file and the CSL custom calibration file for the UMIK-1, see this post (post 10185 in the MiniDSP DDRC-88A thread). Also, read the special sections covering “USB Microphones with Sensitivity parameters: Special Considerations” and “Notes on the accuracy of USB mic calibration files with sensitivity parameter” immediately Page 4 of 132

Getting Started with REW: A Step-by-Step Guide (Rev 5.43, June 3, 2017) following “Step 5: REW Microphone Calibration”. Update June 2015: the MiniDSP microphone calibration download site is now showing 90-degree calibrations files as well. Note 2: If you plan on trying to use an SPL meter (e.g. the popular Radio Shack SPL) in lieu of a USB mic, please read this analysis (post 12143) before proceeding. Using REW on Different Operating Systems REW has been tested successfully on the following versions of the Windows operating system - Windows 7 (both 32-bit and 64-bit) - Windows 8.1 (both 32-bit and 64-bit) - Windows 10 (both 32-bit and 64-bit) Using REW on Apple Macintosh Computers An extremely useful guide showing how to use REW on Mac’s with HDMI connections has been developed by Markus767, and can be found here. Thanks to thread contributor J_P_A, a guide on how to use REW with an Apple MacBook Pro has been developed. The solution also uses SoundFlower (A free Inter-Application Audio Routing Utility for Mac OS X). The instructions can be viewed here (post 4574). Another link created by John Reekie that may be useful for Mac users is located here. A subsequent post (#16018), also by J_P_A can be found here. Page 5 of 132

Getting Started with REW: A Step-by-Step Guide (Rev 5.43, June 3, 2017) A special note for Windows 10 users As of REW v5.15 beta 1, the issue with REW not correctly recognizing the UMIK-1 mic seems to have been resolved. Manual calibration is no longer required. The latest beta version of REW is available on the REW beta downloads web site. It is assumed in this Guide that you will be running the latest beta version of REW. You may want to experiment with microphone level settings in Windows 10, but best results seem to be obtained with a setting of +9.9dB. Page 6 of 132

Getting Started with REW: A Step-by-Step Guide Cabling Basics When Using USB Microphones (Rev 5.43, June 3, 2017) The basic cable requirements outlined in this section are intended for REW users who use USB microphones on the input side. It is not for REW users who are using SPL meters or microphones such as the EMM-6 or the ECM8000, which when used with a laptop require external full-duplex USB soundcards and a source of phantom power (for the microphones). This group of users can find directions at REW Cabling Basics. Two types of connectivity on the output side are described: - HDMI connectivity for laptops that have an HDMI port (by far the simplest output connection) - PC audio connectivity (i.e. the speaker output jack) for laptops without an HDMI port. Input Cables On the input side, the only cable required is the USB cable that was supplied with the microphone. A USB cable extension can also be used. Please note that the maximum supported length of a USB cable is 16 feet (5 meters), although active USB extenders may allow longer cable runs. Output Cables If you will be using an HDMI connection between the laptop and the AVR, then an HDMI cable of suitable length is the only output cable required. Page 7 of 132

Getting Started with REW: A Step-by-Step Guide (Rev 5.43, June 3, 2017) If your laptop does not have an HDMI connection, you must use the laptop’s headphone 3.5mm stereo mini-plug output. The following cable is required: - A 3.5mm stereo mini-plug to RCA (male or female) adapter: Non-HDMI connection, continued: Connect the stereo mini-plug to the headphone out jack on the laptop. Connect the RCA end of the cable to the AUX IN RCA jacks on the front of the AVR. Both RCA connections pass the REW signal, so connecting both RCA connections to the AVR passes a signal to both the left and right channels. To send a channel to either the left or the right channel separately, simply unplug the appropriate RCA connection. Page 8 of 132

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