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Check what happens if you reduce the Ref Time (ms) in IR Windows by allowing REW to estimate IR delay to a smaller number... There's some pre- and post-ringing or "time smear" in my spectrogram view settings post VBA filtering:

Indeed, smoothing peaky in-room response seems to be one of the benefits of having multiple LF sources spread out.

Bjorn's software plots a completely straight line... Which makes me suspect it's just an artifact of how it's drawn in REW.

I sometimes forget the different graph window views can have same named "view modes". Smearing or decay also steers to the right when using the burst decay view mode of the waterfall plot.

I haven't used this view mode much, and really don't understand why the "smearing" appears to steer over time to the right of the graph. Maybe it's just an artifact from the maths used to draw the graph? I dunno.

Major weakness of VBA is that the sub driver emitter source and "absorber" is the same. I rather like Fulcrum Acoustic's attempt at offering of "active bass control" as a viable option for larger PA type venues: https://support.fulcrum-acoustic.com/acoustic/designguides/immersive I don't...

The direct sound is very relevant, but your room mangles the response nevertheless. I can't say how much with certainty one psychoacoustically is able to window-out the later arriving energy in the bass region. For clarity, all that frequency dependent windowing (FDW) does is remove later...

It's usually preferred to use a longer window in the bass or modal region and shorter as you go up higher in frequency when it comes to DRC. FDW 1-3 will give you a sense of the actual phase in the bass region minus much of the reflections effect coming from your room. But, if you really must...

I use this: Cubilux USB C Optical Audio Capture Adapter *I can't vouch for it as high quality enough for your LP recording... but it's good enough for my very basic use case.

You can download mentioned track from Neumann's own website. ... search for "Test Signals and Instruction for Setting up Subwoofer-based Systems (English)"

I mostly agree... Doing everything in REW isn't always the most convenient and there are some unique GUI previewing (drag and drop files and automatically see filtering effect) options that are only found in rePhase e.g. 'energy' centering and filter 'optimization' -- very useful when trying...

I still find it a bit difficult to tell with absolute certainty just looking at the (ETC above) graphs to ascertain pre-ringing/echo audibility -- esp. coming from single-point measurements only. Actually, minimum phase traces (included above) all have zero pre-ringing potential -- unusually...

Can you show me how you would visualize or determine such in an REW plot? You can use the subwoofer impulse response recorded from my desk LP I uploaded earlier as the test "subject". https://drive.google.com/file/d/172G855Sr8MxrULpLLWQWfcZozaN-IvnI/view?usp=sharing changing Q and center freq...

Where again is this 5ms threshold limit specified? From headphone studies? I know that movement of the mic/LP even a few cm or inches often shows up unwanted precausal artifacts in the measurements esp. when cutting GD peaks in the bass, and yet, even obvious visibility in the measurements...

I have no qualms with that sentiment, but levimax has repeatedly mentioned already integration was not satisfactory due to the non-defeatable DSP — SVS’s own choice. You at least have a bit more choice with Rythmik subs, for example. The concern shared is valid so there is really no reason to...

Phase is half of the frequency response. You could create an EQ that produces identical magnitude graphs, too, quite easily. Identical magnitude trace plots do not really mean measurements have the same frequency response at all. The idea is not all too different of a person simply insisting in...

I saw the mdat of your sub measurement some time ago, but simply haven't opened to examine it until now. Spectrogram: *Interestingly, the FIR filter also fixed whatever little apparent "pre-ringing" was recorded in that NF measurement as visible in the spectrogram. :) Adding an FIR...

I don’t use MSO, but REW even with the somewhat questionable UMIK-1 (and also dropped so many times now and where I’ve permanently fixed the cable with lots of electrical tape or else it does not register a connection — oh, yes, taped the capsule as well as it has popped out a few times as well)...

Perhaps it looks worse than it really is in that plot view... potential audible issues are more likely to occur when one just blindly removes the excess phase contribution from the room -- if there's a lot of it! -- i.e. phase inversion part of "room correction". Alternate ETC view: Still, I...

Yes, it's wise to take multiple measurements across a space. Checking if the crossover/EQ actually holds up over a wider area than just a single point...