V5.20.14 early access build

[user44455555]

for the all SPL display, maybe there can add a button "disable all". because often have more measures but want only see 2 in compare. so click disable all and then select the 2 that wish safe time.

 

[John Mulcahy]

for the all SPL display, maybe there can add a button "disable all". because often have more measures but want only see 2 in compare. so click disable all and then select the 2 that wish safe time.

Right click in the graph legend area.

 

[user44455555]

when switch on or off the Plot harmonic ....... picture is not redraw. only when click limit normalisation ....... it is redraw

 

[John Mulcahy]

when switch on or off the Plot harmonic ....... picture is not redraw. only when click limit normalisation ....... it is redraw

That setting has no effect on the THD trace, it only affects the plotting of individual harmonic traces.

 

[sam_adams]

That setting has no effect on the THD trace, it only affects the plotting of individual harmonic traces.

As per @John Mulcahy 's response:

 

[user44455555]

That setting has no effect on the THD trace, it only affects the plotting of individual harmonic traces.

please see video it have also changes on THD or maybe it plot wrong depend on limit normalisation option. measure level was around 80 db. Edit: in edit view video is show, butr not when i save the post. size of video is only 1.1 megabytes. forum problem `?

 

[John Mulcahy]

As I explained in the response to your email on this same topic, the behaviour you are seeing is explained in the help:

Plot harmonics at the harmonic frequency changes the way the harmonic orders for sweep measurement distortion are plotted - rather than plotting the distortion at the frequency of the fundamental it is plotted at the frequency of the harmonic, so (for example) the 2nd order harmonic distortion level for 1 kHz would be plotted at 2 kHz, where the distortion occurs. This makes it easier to correlate harmonic levels with the level of the fundamental at the harmonic frequency and also helps distinguish the effects of external noise, since noise affects all harmonics at the frequency at which it occurs. The THD trace is not affected by this control, it will continue to show the THD value corresponding to the harmonic levels at their fundamental frequency. When plotting harmonics at the harmonic frequency the harmonic frequency is used as the reference, regardless of the state of Use harmonic frequency as ref.

 

[tjcinnamon]

I've been using the new build and one of my subs is giving a huge negative delay. This is irrespective of what output on the MiniDSP is used. The odd thing is that it has a similar impulse response as a similar sub *sub #2) that is measuring well.

Sub 2 and 3 are accurate. Sub 1, I'm not sure. I've attached the MDAT. I didn't try downgrading REW yet

Sub 1:
Delay -195.3607 ms (-67.009 m, -(219 ft 10 in))
using IR start time relative to Acoustic reference played from 3

Sub 2:
Delay 13.9850 ms (4.797 m, 15 ft 8.9 in)
using IR start time relative to Acoustic reference played from 3:

Sub 3:
Delay 8.6675 ms (2.973 m, 9 ft 9 in)
using IR start time relative to Acoustic reference played from 3:

 

[John Mulcahy]

Sub 1 and sub 2 both have very high distortion between about 20 and 50 Hz, sub1 slightly more so. For sub 1 it is so high that the distortion images are looking to REW like part of the IR so it is placing the IR start time much earlier than it should. Try measuring at a lower SPL and if the subs have any boost EQ applied at the low end it may be more than they can manage.

 

[tjcinnamon]

Sub 1 and sub 2 both have very high distortion between about 20 and 50 Hz, sub1 slightly more so. For sub 1 it is so high that the distortion images are looking to REW like part of the IR so it is placing the IR start time much earlier than it should. Try measuring at a lower SPL and if the subs have any boost EQ applied at the low end it may be more than they can manage.

That did it! What is an acceptable amount of distortion for a sub?

 

[John Mulcahy]

Lower is better, though subjectively low order sub distortion is likely a lot less objectionable than for a main speaker. The THD from sub 1 was over 40% at some points though so that suggests it wasn't entirely happy

I have made a change to the code for the next build to prevent it being fooled by very high distortion.

 

[John Mulcahy]

Builds have been updated today with the following:

• Added: Pro upgrade: The input selection dialog for multi-input capture now has an option to not generate an overall average of all the inputs
• Added: Support for d&b audiotechnik tuning filters
• Added: Hold the shift key when using the mousewheel to zoom the graph in the x axis only
• Added: Show a warning message if "Invert second output" is selected when measuring
• Changed: Allow Volts axis to go up to 1 kV (previous limit was 100 V)
• Fixed: Zero magnitudes could cause invalid results in a frequency-limited division
• Fixed: Only apply the Analysis preference to add FDW to measurements when they are made
• Fixed: Ensure dialogs are fully visible when they are displayed
• Fixed: High 2nd harmonic distortion could cause IR start time to be set too early due to treating harmonic image as part of the IR
• Fixed: Measurements using loopback as cal and timing reference would give an array index out of bounds error if the measurement end frequency was not above 1 kHz
• Fixed: The IMD DIN overall calculation used d2L and d3L twice instead of d2L, d2H, d3L and d3H
• Fixed: Deleting all filters on the EQ filters panel set any crossover filters to 1 kHz instead of clearing them

 

[serko70]

Is there a REW setting to default Overlays window open with "everything unticked" or remember last ticked measurements when REW restarts?

The reason I am asking is that when there are too many measurements (and with good sweep length) along with many vector calculations between them, when you open Overlays window for the first time, it selects everything in every window and especially ETC and Impulse tabs can struggle to open. I am talking about well over 50 measurements though.

 

[John Mulcahy]

Remembering the last selections wouldn't make sense for the overlays graph as those selections would only be meaningful for the specific set of measurements that were loaded when REW was last used. There could be an option to only select the current measurement when the graphs are first opened, or only the first N traces?

 

[serko70]

Only the current selection would speed things up

 

[dcibel]

If the overlay window had the same selection as All SPL tab when opened I would find that very beneficial as a time saver, mentioned a page or two back in this thread.

Somewhat related to workflow efficiency, I think it would be great to have the IR window settings of previous measurement, or perhaps the selected measurement applied to new measurements. Currently new measurements get default settings set in preferences requiring selection of previous measurement, then "apply windows to all" to make sure all measurements are using same window settings.

 

[John Mulcahy]

I think the best way to handle that would be to add an option in the right click menu to "Replicate All SPL selections".

 

[serko70]

If the overlay window had the same selection as All SPL tab when opened I would find that very beneficial as a time saver, mentioned a page or two back in this thread.

Somewhat related to workflow efficiency, I think it would be great to have the IR window settings of previous measurement, or perhaps the selected measurement applied to new measurements. Currently new measurements get default settings set in preferences requiring selection of previous measurement, then "apply windows to all" to make sure all measurements are using same window settings.

Even better would be option to apply IR settings to "selected" measurements in AllSPL rather than the current all or nothing approach.

 

[jtalden]

I often want to compare a 2 or 3 measurement subset from a larger measurement group within the overlay window. Moving from; SPL to phase to step to distortion requires repeating all the selections. I would really like "Replicate Current SPL selections" to all the other overlay windows. I don't normally care if the All SPL main tab changes as well. Using All SPL selection to replicate the changes seem less efficient to me when a new subset can then be chosen within the overlay window and replicated there.

 

[John Mulcahy]

New menu:

 

[serko70]

All SPL is very powerful but frankly you're done with it after a couple of measurements and Overlays become the center of focus. I had 67 measurements /calculations at one point today and needed to compare just two final vector averages for step response but overlays got stuck in the impulse window and I had to restart REW. And I'm using a very powerful pc (3rd fastest at HWBOT 12-core y-cruncher). This is a problem that needs to be solved imo but the suggestions here are also really very beneficial to speed up general work flow.

 

[John Mulcahy]

I had 67 measurements /calculations at one point today and needed to compare just two final vector averages for step response but overlays got stuck in the impulse window and I had to restart REW.

Probably ran out of memory, you could try allocating more memory by changing the -Xmx entry in the roomeqwizard.vmoptions file.

 

[jtalden]

Thanks, I this will help me a lot!

 

[dcibel]

For the IR window, I am curious why the response phase result is always phase from t=0, not from the IR reference time location? For loopback measurements I usually have impulse occurring a few ms beyond t=0 (1m distance for example), which makes for quite a bit of excess delay. The way around this appears to be to include a timing offset when measuring, or apply a t=0 offset for the measured results. I find it odd that phase is not represnted relative to IR window reference location, and would love to see this as normal behaviour so t=0 offset isn't required.

 

[serko70]

Probably ran out of memory, you could try allocating more memory by changing the -Xmx entry in the roomeqwizard.vmoptions file.

I don't think it will happen again but noted. Actually, may be there should be options higher than 2GB when installing REW, most PCs today have a min of 16GB of RAM.