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Analyzing Waveforms of Heavy Hitting Movies


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#21 Madaeel

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Posted 31 May 2015 - 04:06 PM

Nube here's a SL cap of that scene which I use as a reference and also which made me realize the near field Raptor was shit. My 5-10hz was better but from 10-25hz I had a huge null. Back up front where they belong. Of course I'm not reading anything from 1-3hz but everything else is there.

 

Attached File  OHF.png   1.1MB   0 downloads

 

 

 

 


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#22 Shredhead

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Posted 03 June 2015 - 04:49 AM

I'll get on the Transformers 1 for ya max.  Is it at the end where they are fighting in the city? 

 

nube, I've been hearing about that scene for a while now but we don't have the movie and I've never seen or experienced it.  I'm pretty sure Bosso watched it at some point and he might have capped some SL action but I can't remember.  I'll keep an eye out for the movie in bargain bins. 



#23 maxmercy

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Posted 03 June 2015 - 12:55 PM

Yup, right after Megatron shows up in the city.  He blasts Jazz with his arm cannon and it is the strongest ULF transient in the film.  For comparison, you could do the tank (wrongly named devastator) dying or Ironhide's flip, both of which had significant content in different registers.

 

Thanks!

 

JSS



#24 MKtheater

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Posted 03 June 2015 - 03:11 PM

I tried running spec lab on that scene but my computer stopped seeing the 975 for some reason so I went to bed. Just start playing at " It's Megatron" and you will know!  The woofers dance for that scene.



#25 Shredhead

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Posted 12 June 2015 - 05:19 AM

"9"  DTS-HD MA 5.1

Cannon shoots at spider

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#26 Shredhead

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Posted 12 June 2015 - 05:24 AM

Captain America The Winter Soldier.  DTS-HD MA 7.1

-Airship crash

a4822d713a90db922de53e44ab49396e.png

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-Vending machine scene random ULF

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#27 Shredhead

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Posted 12 June 2015 - 05:29 AM

Iron Man 3.  DTS-HD MA 7.1

-Missile attack on Tony's house

1a477d3a08d960ad0d8aaa43391ae895.png

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#28 Shredhead

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Posted 12 June 2015 - 05:35 AM

The Amazing Spider Man.  DTS-HD MA 5.1

-Projectile launch on top of tower at the end of the film

059e56ec7379f04bafac8a21d3f6fb09.png

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#29 Shredhead

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Posted 12 June 2015 - 05:42 AM

Transformers.  Dolby Digital 5.1 (DVD)

-Ironhide flip

9f2ea51e9fe17059e3a8cb579d168fc3.png

48fff571c01c3176f4b763e71c41a43e.png

 

-Megatron ULF blast

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-Sorry max, all I have is the DVD. :(  I think I can get my hands on the BRay and when I do, I'll update this post. 


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#30 maxmercy

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Posted 15 June 2015 - 02:33 AM

No problem.  DVD and BD tracks are very similar.  You can see the ULF pulse clearly.  On the BEQ version, it is more insane.  Great effect.  terrific 'crack' at first, followed by the ULF rumble of one full cycle.  You can see the cones move quite far if your rolloff allows it, and it is a new experience compared to my old setup.  

 

JSS



#31 Shredhead

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Posted 16 July 2015 - 04:19 AM

This soundtrack is ultra dynamic and these transients are powerful. 

 

Star Trek.  Dolby True HD 5.1

-Spock's ship and Nirada warp jumps

64d89b80936b5c63b84a3b1b6a2d01e4.png

9be231203b5a09a29323a57c68b4d031.png

 



#32 maxmercy

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Posted 16 July 2015 - 11:56 AM

One of my fav tracks, especially for these transients.  The warp effects were not as good in the second film, IMO, except when the dreadnought comes out of warp.  That 55-60Hz energy in the Vulcan ship's warp had a mighty kick.

 

JSS



#33 MKtheater

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Posted 16 July 2015 - 04:56 PM

I just watched STID.  I then tried a scene in TDK and then TDKR right after and what a difference, TDK was head and shoulders a better mix than both.  ST is even better than TDK. 


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#34 SME

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Posted 17 July 2015 - 05:05 AM

I love revisiting that scene after every improvement in bass performance.  Every time, it's cleaner, harder, and more satisfying.



#35 ;::;

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Posted 18 July 2015 - 10:29 PM

.. 



#36 ;::;

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Posted 18 July 2015 - 10:42 PM

.. 


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#37 Shredhead

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Posted 18 July 2015 - 11:29 PM

 

Where is the activation for waveform on spectrum lab.

 

 

It's called amplitude bar on the 1st page of SL's settings or you can follow this post's directions and download the zip file at the bottom of the post and it will bring it up for you when you load the settings file: http://data-bass.ipb...-thread/?p=8831


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#38 ;::;

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Posted 22 July 2015 - 02:42 PM

.. 



#39 MemX

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Posted 22 July 2015 - 05:32 PM

 

Prometheus (2012)

Ship crashing into ALIEN ship LFE.1 dtsHDMA 7.1 English, monitored on Lucasfilm Ltd THX  sound system crossover/monitor 3417. SDDS Fader at  -2.9db. 

 

Where is the activation for waveform on spectrum lab.

 

11722217_849339378468793_658744932147684

 

 

That ^^ is such a frustrating scene to watch - you're expecting sofa-shaking depth and instead get some poor effort that sounds weak!


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#40 Shredhead

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Posted 11 October 2015 - 05:13 AM

I've been thinking about amplifier burst testing lately.  The capacitor reservoir in amplifiers is different in every design and it makes a big impact on how the amp performs in sub duties for huge transients where it can give the amp more power than it can draw from the wall power outlet. 

 

There are no standards to what length amps are tested for burst power duration.  Some claim that they should be tested at up to 500 milliseconds for burst power while others use 1ms and sometimes less to show that an amp has a higher peak power despite having a small cap bank. 

 

With a timescale (horizontal) of 50ms per division, here are the different lengths of CEA bursts at a few different frequencies:

e1cedb169b796e7e2cfa4bd99f1c5f8d.png

You can see how much more demanding a 5Hz burst would be because it is a longer duration which will drain a cap bank more than a shorter burst. 

 

Looking closely at the 5Hz burst, we can guess where the capacitor reservoir will start to discharge.  If we figure that we have a 120V/30A (3600W) power outlet and an amp that is about 60% efficient so that it can do a sustained tone at around 2205W, a 5 ohm speaker load at 5Hz would make for around 105V before running out of juice from the wall.  Everything above 105V would have to be covered by the cap bank.

6483fd87d0195d4b7a457c3a5b30bebe.png

This graph has a vertical scale of 50V per division and a horizontal scale of 50 milliseconds per division. 

 

Since we now know where to look for the transition from wall outlet power to cap reservoir (a bit over 2 divisions or 105V), we can zoom in on different CEA frequency bursts and see how much time the cap bank will have to pick up.

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Single digits get pretty stressful on an amplifier no matter what topology it is. 

 

The question is what burst frequency is the most logical to use to test an amplifier's capabilities.  Stay tuned and I'll show some real world movie content shots of transient waveforms and their time duration zoomed in on to see if that helps pick a burst frequency that most closely matches the stresses that some of the coolest bass hits in movies inflict.  


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