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Everything posted by 3ll3d00d

  1. Wonder Woman - corrected vs pink noise - https://imgur.com/a/KptYn
  2. Wonder Woman (2017, BD / Atmos) - JRiver equivalent filters NB: I refer to it as S below to differentiate from the original post, jriver calls this Q though. measurement to verify shape -> https://imgur.com/a/05Ixe UHF / distance (relative to flat response; see note*): High Shelf: f0 = 13900.0; S = 0.442082; gain = -3.501 HF slope (see note **): High Shelf: f0 = 3140; S = 0.9997; gain = -2.0 High Shelf: f0 = 7750; S = 0.552885; gain = -2.0 EQ Peak: f0 = 1950; Q = 1.75; gain = +0.33 MF shelf: Low Shelf: f0 = 1000; S = 0.720521; gain = -1.25 LF shelf: Low Shelf: f0 = 265; S = 0.785708; gain = -4.0
  3. Nuttall I made the image a bit bigger and included pink noise spectrum as a reference curve for comparison - https://imgur.com/a/yxK3V If there is some other reference curve that would be better then let me know & I can update it. I'll get to the after pic tonight probably.
  4. This is the before C channel for Wonder Woman, I ran it through speclab with no decimation and 4096 fft length to give ~11Hz frequency resolution https://imgur.com/gIHjYdF
  5. OK, I'll pull that out for you. I do know how convert to jriver format filters. Are there any particular scenes (or segments of the film) I could use for this?
  6. I have wonder woman so can extract this for you with and without your correction on top if you like. Just post what you want to see and I will get to it over the next few days.
  7. have you tried Capt America Civil War? if not, I will give it a go. The LFE channel is a straight line rolloff on a linear scale on both avg and peak from 30Hz down so I guess that's a good sign (for a track that should yield some useful content)? https://imgur.com/87rzdnR
  8. The reason I suggested using MSO is because you have complete control over the parameter range for each filter and also complete control over how many filters, and what type, it can use. Combine this with smoothing of the response if necessary and I would have thought you'd end up with a smooth filter shape. re headroom, is it the summed result that is the concern? that seems a long time to wait for processing, what are you using for that?
  9. Removing the drivers will help alot IME as the weight will be more evenly distributed which makes them much less of a bear to manage (and also means the driver is safe if you do have an accident with the box)
  10. If the approach is based on a target curve which is based on other known good bass films then t seems like this should be amenable to automation, at least as a first cut anyway. For example, create a minimum phase representation of the actual response and a target curve, load into MSO and create a configuration that has a load of adjustable Q shelf filters & some PEQ available to it then give it some time to work out what combination of filters produces the target response.
  11. FWIW I used jriver convert format to generate the input wav file and then these are run through my app in a way that is equivalent to the approach used around here in speclab (which decimates it to 1000Hz and then runs it through the fft with a nuttall window of either 0.5Hz or 1Hz resolution, I forget which). I used a 0.5Hz resolution in my case, this is pretty much all done by scipy (for the fft bits) and librosa (for the resampling) I thought I'd double check so used eac3to to generate the wavs instead (though they both use the same underlying dts decoder anyway - https://github.com/foo86/dcadec), same result. If you get a different result then it would be interesting to know how you're performing that extraction and conversion.
  12. It is L R C LFE RL RR SL SR (which is pretty standard afaik)
  13. admittedly I haven't reduced the capacity in my system at any time yet but I think I must be at the point where moar genuinely is overkill (at least without changes that allow me to put more subs in the room anyway). I did have a pair of low teens xmax 12s behind me which gave solid response down to ~14-15Hz in the NF position whereas I now have a pair of high xmax 18s so that yields something like 5-6x the Vd. This is quite a large uptick. Admittedly part of the reason is to get a larger radiating area so even that impact across the sofa but it remains to be seen whether my wife appreciates that anyway back to the subject of this thread... I ran some quick tests today to check for port noise, I went to ~112dB (at the LP) with no noise at all & you could just about feel the air if you put your hand on the port. I used REW's CEA-2010 signal for that test at 16, 20 & 25, the only distortion product visible (at that ~112dB level) was 40-50dB down so basically non existent. I'll push that some more another time just to see what happens. I haven't had a chance to properly run through some listening sessions yet so will leave any subjective commentary til later.
  14. atm I have an inuke3000 and an sp1-6000 so I will use the sp1 on the dual uxl at the rear and have the inuke bridged for the 21. Sadly US goods are pretty expensive since Brexit so I doubt I'll get another speakerpower amp, it's probably overkill anyway. I'm not sure what I'll do long term, it depends whether I keep both UXL or not. I have a feeling 2 18s behind me will be overkill (though they make a handy behind sofa shelf) so may end up selling one of them. If so I'd probably look at also selling the speakerpower. The peavey ipr2 7500 seems a reasonable mix of price & power & features, they are about £1300 here whereas an sp2-12000 will be closer to £3k landed. meanwhile, raw in room response https://imgur.com/a/X4Sw0 NF is the one with the big dip in the 20s 21 looks pretty similar to the modelled response
  15. I had planned on the tune coming down a touch from the model based on port location but you know it never occurred to me to think that would also bring the first resonance down too, blindingly obvious now you mention it 0 degrees is about 16.5Hz btw
  16. added stuffing around the edges of the cab to see if the spike was a resonance within cabinet, new curve in orange has that damped down a fair bit so I guess that is what it is https://imgur.com/a/MmYJK
  17. dropped the driver in for a quick test https://imgur.com/a/GtvrX suggests tune is ~18Hz, modelled was ~19Hz I guess that peak at ~110Hz is 1st port resonance? model suggested that would land around 130Hz if so so not sure why that is a way off. Plugged a similar model into tl.app and that does show a peak around that point.
  18. it's fair to say I'm not the fastest woodworker in the west
  19. hopefully installing it into my system this weekend https://imgur.com/a/8nj7S
  20. I notice (in that speaker shootout thread on avs) you commented about certain aspects of your room response being SBIR rather than modal in nature. I was curious to know what you meant by this. I suppose I am thinking of 2 specific question. What makes you say it is SBIR rather than modal? what practical difference has this made to your treatment strategy?
  21. the actual design is like so, ~190L and a tune around ~18.5Hz (assuming my model is accurate)
  22. I've made progress on the cab, the bottom (on the right of the pic) is glued on & am have the rest at the dry fit stage just to make sure it all fits together properly. Obviously that centre brace will have the middle cut out once I get the top of. Bit of a squeeze making this in my shed
  23. I don't think it's fair to characterise those threads as maximum vibration chasing. Obviously there are some people who do that, just as there are people who chase extreme SPL, but mostly it's about finding out how it responds & what feels right/good. There seems a lot of variation on that point, or more specifically, the way people describe what they like seems to vary a lot. It's all about balance in the end.
  24. http://www.avsforum.com/forum/113-subwoofers-bass-transducers/2434250-nearfield-ported-mbm-increased-mid-bass-tactile-response.htmland particularly http://www.avsforum.com/forum/113-subwoofers-bass-transducers/2118090-vibsensor-accelerometer-test-thread.html are where you should find other measurements, not sure how many have been photobucketed though. Generally speaking people have been weighing down the phone with a sack of rice (or similar) to keep the thing under control at low frequencies. This also damps the response above 30Hz or so from what I have measured but does seem to produce a shape to the response that more closely resembles that of a lighter, more accurate and securely attached, sensor. You can avoid this by using such an external sensor. Sitting on the seat does naturally change the measured response. I posted a comparison somewhere on avs at some point iirc.
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