The 'Average' button only considers the SPL. There is a much more detailed amd comprehensive support section for REW on the forum its downloaded from, so your probably best asking there for help on its more advanced operations. The mains are set to 2.8meters distance, with the subwoofer set to 3.8meters distange on the Tag processor, which I have assumed offsets any processing delay of the SMS-1. svs 25-31 pci and svs pb10-isd, sms-1 eq bypass plus linn aktiv keilidh mains 2012-10-21.jpg, svs 25-31 pci and svs pb10-isd, sms-1 rew 1db flatness 82db target setting plus linn aktiv keili.jpg, svs 77db 1db flat sms vol 08 2012-10-21 72dB vol 14.png, svs 25-31 pci and svs pb10-isd, sms-1 eq bypass plus linn aktiv keilidh mains - spectrogram 2012.jpg. It assumes that you already have a working knowledge of measurements with REW. Copyright © 2000-2020 M2N Limited E. & O.E. Good stuff, its always nice to hear someone getting the best out there system for nothing more than a few hours learning rew and optomising the system. Had we measured left+right mains in that session we would have seen the the exact trace shown in the A,B average. You must log in or register to reply here. By measurement? This then allows REW to give really accurate impulse time plots. 1 Home Entertainment Tech Community & Resource. This section is dedicated to showcasing or sharing valuable information about Subwoofer Tuning. If you are using an external soundcard, you can use a loopback connection. If you are using a USB mic, you may be able to use the new "acoustic timing reference" feature. Then if we plan to use Audyssey we will eq flat in REW/minidsp or equivalent so that when we hand off to Audyssey and it measures it sees a nice smooth flat target which is what it wants. With the sub located behind the mains apply a time delay to the mains respective to the distance between the two ? Before and after REW waterfall measurement plots attached. If I understand correctly that you are looking at the two sweeps separately, the relative timing/phase won't be meaningful unless you are using a timing reference. If not, first see the app note UMIK-1 setup with REW.REW version 5.15 or later is required. Try looking up minimum phase in the help file. Not enough information... how are you determining whether the phase is aligned or not? (REW will simply set the impulse response peak at 0 without a timing reference.) I think the spectrogram plot is showing the subs are slightly ahead in time alignment. I did some further reading on htshack. AVForums.com is owned and operated by M2N Limited, The administrator has disabled public write access. I'm looking a setting up for some measurements with REW and the line out from my radio shack sound meter. So with REW we can measure and use the info to place multiple subs and we know placement is good. To answer my own question REW can be configured with one channel for the mic/soundmeter and the other looped from out to in. This app note will explain how to use the acoustic timing reference feature of Room EQ Wizard (REW) with a miniDSP UMIK-1 to accurately set delay between speakers in your home theater.. company number 03997482, registered in England and Wales. I must say I'm having trouble understanding the phase, group delay and spectrogram plots. I am using the UMIK so i will have a go at the acoustic timing reference. Ah. I must say I'm having trouble understanding the phase, group delay and spectrogram plots. Europe's busiest forums, with independent news and expert reviews, for TVs, Home Cinema, Hi-Fi, Movies, Gaming, Tech and more. Ah. Powered by Xenforo, Hosted by Nimbus Hosting, Original design Critical Media Ltd. Have you tried using the GD graph to calculate the minimum phase? (REW will simply set the impulse response peak at 0 without a timing reference.) Join the AVForums team live on Wednesdays at 7pm UK time. You can use features like impluse response etc, and use the frequency sweeps to look for tell tale phase dips in the response where the speakers and sub overlap. For a better experience, please enable JavaScript in your browser before proceeding. It also isn't looking at adjacent seats for alignment. If you are using an … I put in an hour getting to grips with REW. If I understand correctly that you are looking at the two sweeps separately, the relative timing/phase won't be meaningful unless you are using a timing reference. The No. If so, does changing the delay and inverting polarity change the measurement? The below screen capture recreates the process so you can see the REW controls used to create it. Then about 5 hours moving and measuring. ... accurate phase alignment using REW's Alignment Tool. Podcast: Best Hi-Fi products of 2020, Plus Best of the Month for TV Shows & Movies, | Anthem AVM60 4.0 | 2 x Crown XLS 1502 Amplifiers | DIY L&R | M&K CS22 | Zappiti 4k HDR | Roku |. Thanks moonfly. With referecne to the delay / physical distance would you take a physical measurement of the sub speaker centre and mains centre to the main listening position? This allows you to see the exact time discrepancy between sub and speakers and easily adjust it. One benefit of the StormAudio ISP is that one can have a Profile with the subwoofer time and phase aligned to L/R for two channel content and a separate Profile with the subwoofer time and phase aligned to the center speaker for best dialogue intelligibility for movie content. Multi-way Xover + Dirac Live on DDRC-88A/D. I used REW 'Trace arithmetic' which includes the impact of phase. I seems to work really well. 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