Thanks John, that explains why the two graphs were slightly different in the high frequencies. Another quick question, how I do I change the color of the curves? If I displayed more than one on the screen, they often had the same color. I managed to change them on the "View" tab and fooled around with the "trace colors" but I really didn't know if I did it right because the results seemed random each time regardless of the color I clicked on. For example, am I supposed to click on set default colors after click on a color of the "choose a color" pop up chart?
You can change the colour of any individual trace by clicking on the icon that looks like a paintbrush on the measurement panel. The default colours for new and existing measurements can be restored by clicking on Set Default Colours. If "Save trace colour with measurement" is selected on the view screen the colour a measurement used is saved in the mdat file and restored when it is next loaded, if that is not selected measurements loaded from file will use the next available colour from the View preferences list.
I've been told tat you authored a very fine transient response measuring waterfall program. Ever since I've first seen a waterfall plot (which fully appreciate) I wanted to see a 3-D graph examining steady-state response where the temporal axis was replaced by frequencies output for every frequency generated tone input. Has your microphone capable of a real-time fast-Fourier-transform analysis? Perhaps, it would read easier if the output frequencies were normalized by dividing by their respective input frequency & label it, “harmonics”.
I've heard so many speakers that make noise at frequencies that ear very little resemblance to the signal, especially at real-bass & super-treble extremities. It'd be nice to see what I hear. Thanks for your consideration.
First of all I want to say thank you for the unique great job.
Sorry, I write in this thread, but I was unable to find a topic for suggestions to the author of the program. I would like to see a button or check box "always on top" in RTA program window, it will be very useful function when make real time fine tuning with DSP control programs. Also, it was, would be very cool to control the transparency of program windows. Can you add more XO types for EQ window, for now is not clear what type of filter (BW, LR) is used in the program. Also, in EQ window will be useful function for add more one "HF Fall slope" function for modeling B&O psychoacoustic curve. Can you add more features for EQ, for LP and HP filter types will useful gain and Q control also (miniDSP like filter). And I think that in your plans a writing some for generate correction filters for common system phase/response correction (DRC). That would be absolutely great all-in-one software!
My English is very bad, I apologize for that. I will thank you to inform me if REW V5.1 works well with external "USB Focusrite Scarlett Blast Solo" and "microphone Behringer ECM8000".
I have Rew 5.0 installed and want to upgrade to 5.14. But I am afraid that my files and CAL files will be lost if i just download and install 5.14 on top of 5.0. Can someone please advice on how to upgrade to a later version without loosing anything?
Best regards
Sleiven
I compared REW white noise RTA plot compared to REW runs, with 1/12 smoothing. Don't know which plot validates which, both are, to my old researcher eyes, amazingly close. The upper trace is a sine run and the lower is white noise RTA, under 200 Hz to above 10kHz. Somewhat more convenient to do white noise runs, just a few seconds at upper frequencies and you can fool with your EQ in real-time.
Thanks, John, great tool.
Ben
To window out reflections requires an impulse response, so a sweep measurement. The width depends on the time to the reflection(s) to be removed, which in turn depends on how far you can place the speaker from all surfaces (including floor and ceiling). Best measuring suspended outside for an approximation to anechoic when suitably windowed.
Hi ... sorry if this has been asked elsewhere, I've been searching and can't find it. How can I use REW to set the speaker distances on my surround pre-amp and also to make sure the polarity of my center speaker is right? I did the loopback calibration, and measured group delay (see attached graphs of left speaker and center). Not sure if this is close enough?
Thanks
Tom
OK, I didn't have loopback as a timing reference enabled in the analysis section, so did that and looped back the 2nd channel (btw - any way to verify that the loopback is actually working? When I run soundcard calibration it always uses the measurement channel).
Now looking at the IRs for center and left speakers (with loopback reference timing enabled), here's what I get. Not a clear peak ... and it seems to start around zero for the left speaker, but quite negative delay for the center ... not sure what to do with that?
If you use the % FS scale the peaks will be easier to see. The centre measurement looks like there are two speakers playing as there are two peaks of the same level. When using loopback as a timing reference it would be very strange to have negative timings assuming outputs and inputs are on the same soundcard - difficult to see how a signal through the speaker could arrive earlier than a direct wired connection at the soundcard. Perhaps you should explain exactly how you have things wired up, preferably by starting a thread just for this since it doesn't really have any to do with the REW V5 tips.
Hi shnee(I know you by another name lol). By "good enough", do mean flat enough? I've never known the phase information to be terribly useful, but the freq graph looks really nice to me. Curious, why you're measuring in 7ch stereo. I would think that could add combing, or other phase issues that would be irrelevant during actual listening. I would also prefer a house curve over flat.
Haha, I think I know you from the other forum too. Thanks to REW, I have collected numerous graphs for my several setups including the two channel ones. I thought the HT setup was good enough based on the freq response graphs, so I have been too lazy to do try any manual adjustments after Audyssey. So yes, to me good enough means flat enough, though I do understand the waterfall graphs should be looked at too to see that decay times are not a problem. That may change because I have just been told by TheWarrior that I should pay attention to the phase graphs as well. That's something I never thought would make much difference in a real room playing real music, 99% movies in that room too and that's why I focused on getting the flattest response for 7 channel. I used 7 CH stereo for taking measurements only.
I thought maybe someone like JohnM or other resident experts here wouldn't mind enlightening me on whether the phase graphs indicate something of significance. I always assumed Audyssey had to do the balancing act, such that something could be made worse but the overall results would be better. All I can see from my REW graphs is that it has improved the frequency response from 10-110 Hz, a touch worse between 115-200 hz and didn't do much above 200 Hz. I don't know if it made the phase and decay times audibly better or worse as I am not 100% sure that I interpret the graphs correctly.
I'm sure John, Wayne,(not john Wayne lol), or jtalden will pop in sooner or later and give a more expert opinion. As far as ringing goes, my understanding is once you get driver control to a certain level, i.e: quality subwoofers, bass traps are the way to handle that. It does look like 35 and 55hz(ish) are the worst for ringing, but I am not very well versed on waterfalls so... sure the guys will give you plenty of help. I kinda just wanted to not let your post sit. I think you'd be good here. I'll see you over there. Lol
Hello !
I'm new member. I download V5.0 and worked good......Thanks!
Try to download V5.01 BETA and everytime I try to run the program my PC is shut down. Help Please.
Thank You Very Much John ,
I will try that and let you know how it turn out.
Regards,
Iggy
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