If your subwoofer and main speakers are in phase, the woofer cones on the subwoofer and the speakers will move forward and backward in sync at the subwoofer crossover frequency. Also included is the SPL and Phase. You'll find this more or less spelled out in steps 6-11; there's more to do before, and after though. Have been using REW to attempt to get a time delay / phase correction for sub-woofer. To check your sub's phase, play music with lots of bass, listen for a minute or so, and have a friend sitting by the sub flip the sub's 0/180-degree phase switch slowly back … JavaScript is disabled. They include a power switch (on/off and auto), low-pass filter (20-130 Hz) and variable phase (0-270 degrees) dials, a 0/180 degrees polarity switch, e.l.f. I am trying to fine tune the phase for a Rhythmic L12 and a near field setup. When I run the automated calibration for my processor (Emotiva UMC-1) it sets the subwoofer distance at 25ft instead of the 10ft that it is and I do get a smoother response too in REQ. The basic, un-adjectived version of MCACC simply measures your speakers, balances the levels, sets your crossover, tweaks rudimentary EQ settings, and applies phase correction to the subwoofer. REW is free room acoustics and audio device measurement and analysis software for room, loudspeaker and device responses. You can have success using this adjustment as a tool for better bass integration as well since most phase switches on subs are 0 to 180 degree switches, which affect ALL the frequencies. I have been using REW to take measurements in my main listening position. Window length 300ms. My end game is to run Dirac but my understanding is that I need to get my phase and positioning of my subwoofer aligned beforehand. Home Theater Receivers | Processors | Amps, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. I'm using REW, so I'll report back my findings when I have a moment to test. If the bass is not to your liking, flip the phase either to 0 or 180- listen for quality- and you’re done. Out of phase with the main speakers so together they are cancelling the sub bass frequencies. Both mains and sub-woofer are active with inbuilt DSPs (with their own delays) so pure physical alignment of speakers isnt sufficient. When it came to phase settings I found that settings other than 0 deg in my room would cause a drop in output right around the 80hz crossover point I was using. They'll reinforce each other's output. Using a cross-over frequency sine wave on narrow band pink noise. Return your speaker connections to their previous (correct) positions: red to red, black to black. So Sine wave at 80hz with speaker wires reversed, this is what the RTA looks like at 0ms. Use REW's "Pink PN" test signal, set the RTA for Rectangular window, no averaging, 64k RTA length. Measure with the sub and one main speaker running. So this is the wavelet with a 40ms second delay then with a 0ms delay. Try phase at 0 and 180 degrees to see which gives the smoothest response through the crossover region, then fine tune by varying the distance setting. The best method would be to use the RTA and make your adjustments while you watch the effect on the RTA. Unfortunately due to WAF I am stuck with the MLP at 12 feet from the front wall with a little bit of leeway side to side. Asio allows me to access all the speakers from REW and actually FlexAsio was a breeze too set up. (Extreme Low Frequency) trim knob, and a master level control. Sure but I got it in my head after watching a RMAF video I should work on it and I have REW sitting here so I figured I could learn how to do it without letting my AVR do it for me (which in this case is using a dumb amplifier). Getting sensible phase measurements can be tricky, you need a loopback as a reference and need to take account of the transit time to the mic, and even then it is a difficult way to decide what to do. Controls are hidden away behind a removable cloth grille on the subwoofer's front, but are easily accessed. Not in the optimum place so that it is not effectively pressurizing the room. Setting the Crossover. Come join the discussion about home audio/video, home theaters, troubleshooting, projects, DIY’s, product reviews and more! Thus, they tend to produce better bass due to having larger drivers and better in-built amplification. In the case of frequencies below 200hz, it's really tough to get a flat phase response. Types of Subwoofers . 6. Rear panel connections include stereo … Best, Lewis Floorplan. Subwoofer is crossed over at 80hz via the amplifier crossover. Can you change 1 ms at a time or even smaller? TRY IV, When I set the left subwoofer phase is 150, set the right subwoofer phase is -30, the REW frequency response of two subwoofers is very good, is about ±5 db. In theory, putting the subwoofer 180 degrees out of phase with your other speakers would cancel the frequencies in the crossover region. I have been taking individual measurements of the Sub with mains off , then measuring the mains with sub off. Phase setting I was just playing around with my new SVS PB16 this weekend and i was running REW and doing sweeps after every setting change. A forum community dedicated to home theater owners and enthusiasts. Listen to the quality of the sound. multiple subs, proper speaker/subwoofer and seating placements and hard to ever go … I am using the 2x4 Advance module and setting up a 4 subwoofer system. I assume that the UMC-1 is setting the distance higher to compensate for the phase. BUT, when I test the two subwoofers in same time with REW, the frequency response TRY I/II/III are about ±8 db. Of course, phase and frequency response are closely related to one another. I then cross reference the two frequency sweeps against each other in 'SPL and Phase' , I havent gated the measurements or adjusted impulse response time delays. I'm very new to home audio and am struggling to get some basics down. The audio measurement and analysis features of REW help you optimise the acoustics of your listening room, studio or home theater and find the best locations for your speakers, subwoofers and listening position. Its more about learning how to use REW and how to properly read measurements. Again, to make the most out of this tool, one does need the ability to take measurements. It is indeed happening with no subwoofer, and I always make sure to calibrate the phase relationship of the sub to the mains with every move. Try phase at 0 and 180 degrees to see which gives the smoothest response through the crossover region, then fine tune by varying the distance setting. 1 pixel = 1cm Blue = Main Speakers Dotted = Subwoofer 1–3 = Mic locations A = Single monopole subwoofer configuration B = Dual monopole subwoofer configuration, optimized for low seat-to-seat differences That is to do an initial smoothing with REW MiniDSP, then run YPAO/Audyssey/Diract etc then correct any dips with distance correction (in REW/MiniDSP), or modest EQ application. They are the most useful to consider in using REW for bass integration. JavaScript is disabled. I am not sure I am doing this right. The subwoofer is behind the listening position. You must log in or register to reply here. That's good. Posted is a snapshot of the RTA using Pink PN with a sequence length of 64k, full range. Here’s what’s happening when you follow this procedure: By reversing the polarity of the main speakers, you’re putting them out of phase with the subwoofer. 7. I guess trail and error is the easier way to do. This subwoofer has become our measuring stick, which might actually be unfair to the competition — it’s that good. The REW phase response is correct for all measurements and is referenced to 0 ms. > With loopback and acoustic timing disabled REW will automatically adjust the impulse back near 0 dB. using impulse responses from location 1. First, let me digress a little with an explanation about phase. Also included is the SPL and Phase. is there a way to set is more precisely? You should also be looking at the distance setting for the subwoofer. This setting is 40ms on the subwoofer with a 12db LPF Slope. IMO, subwoofer integration is all about obtaining flat bass. What I would do. Because there would be two different arrival times at the measurment mic. Spectrograms were generated in REW V5.00. I wanted to see what happenned to the big dip at different distances from the front wall. Check out the specifications … Please share with us your calibration and setup procedure in achieving bass nirvana. I currently have 2 subs set up and quickly realized that they were inverted in phase, flip the phase switch, remeasure and it all lined up. I bought a UMIK-1 and started down the REW path but don't know how to interpret the results. That means it's important that the main speaker and the sub measure as flat as possible, especially at the crossover. I am taking measurements with REW to match the response and phase of each subwoofer to the others as they arrive at my listening position. The speakers are 2ft from the listening position and the sub is 4.5 feet away from listening position behind so it should be 2ms or so. Adding or subtracting a couple feet from the distance of your subwoofer is a viable way of getting rid of an ugly peak or dip around the crossover point. For a better experience, please enable JavaScript in your browser before proceeding. Use REW's "Pink PN" test signal, set the RTA for Rectangular window, no averaging, 64k RTA length. hello I have my dual subs located in front along the line of my left and right mains- phase is set to zero. There is a problem with the input connection so there is not enough input signal to get amplified. Where things get convoluted is when you are also juggling the distance setting as that'll also affect how strong it'll sound. The Basic+ is $75 + $9 shipping. 40ms seems like a huge amount of delay for a nearfield setup -- over 13 meters! Measure with the sub and one main speaker running. Clearly it should be closer to zero. You can see in both plots the kind of result you would see in an anechoic chamber, a nice smooth response with very even and quick decay. Here is a nearfield subwoofer measurement which excludes the impact of the room. Bowers & Wilkins P7 Parametric EQ settings, Room Acoustics and General Speaker Discussions. ASIO4ALL was a nightmare. Subwoofer is crossed over at 80hz via the amplifier crossover. Adding +7ms to the sub (or adding -7ms to the mains) makes more sense as the overall delays on the mains relative to the Sub would then be around +10 to +11ms. For a better experience, please enable JavaScript in your browser before proceeding. Posted is a snapshot of the RTA using Pink PN with a sequence length of 64k, full range. The Dayton emm-6 comes with a calibration .txt file (this will makes sense later in the guide) from 20hz to 20khz, if you think you have a serious subwoofer setup and have a lot of output below 20hz you may want to buy a mic that is calibrated from cross spectrum labs. Is there a link to what this should look like or what I should be aiming for? Subwoofer phase (typically most effectively manipulated to find the best blend between the subwoofer/satellite system at the crossover frequency). 1.2 Perfect wiring connections of Subwoofer. Crossover is the frequency where speakers begin to roll off, and the subwoofer starts outputting bass notes and LFEs. The subwoofer’s phase control is now set perfectly. If I switched phase to 0 degrees on the Hsu VTF-2 subwoofer I could see a definite dip at 80 Hz (telling me the 180 degrees was the best setting, my mains are wired in reverse polarity because my Rogue Audio 99 pre-amp inverts absolute phase). Above and beyond this, the distance adjustment functions as a phase control of sorts. It is helpful for several of the charts; phase, group delay, spectrogram, etc, to have the impulse placed at 0 ms. REW showed me that at any other crossover setting I had a sharp null at around 50 Hz. The subwoofer is behind the listening position. The sub goes incrementally from 0ms to 135ms. When selecting 'align phase at cursor', REW suggested a delay of -7ms, which is why I was questioning it as it would take the mains out to +25ms relative to the Sub.

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