Jump to content
Kvalsvoll

The Bass EQ for Movies Thread

Recommended Posts

16 minutes ago, maxmercy said:

This track should not come close to 128dB WCS, largest peak on the ATMOS BEQ is 121dB.  The BEQ after-gain for dialogue matching is only 4dB, not the usual 7.  

Watching this BEQ at '0' would yield a peak of 124dB (

I did not apply the correction to the DTS track to see how it would do, but I do know the DTS track had a lower Crest Factor.

I chose the ATMOS track to BEQ since it had the more dynamics of the two.  

There must be a substantial difference that PvA and simple wav stats do not show to have had that large an effect to clip your setup.

JSS

Thanks for your comments.  I realize I will need to do the UHD upgrade sooner than later.  It's a top priority when I have the income for it again.  At the same time, Netflix by mail doesn't offer the discs, which is a drag being that the prices to buy the discs tend to be a lot higher too.

This was an unusually quiet track, and so I'm surprised to learn that the Atmos track had an even higher crest factor.  Wow!  Even at "0" (or -2 vs. 85 dBC reference after dialnorm), the level seemed quite moderate on the DTS track.

I assume I didn't exceed 128 dB WCS.  Even if I did, I don't have that specific limitation in my signal chain.  As such, I don't apply the static gains in the corrections and have no need to compensate using my MV.  My headroom is effectively unlimited until the output stage to the amps (i.e., before the DAC), for which I have ~3 dB more than the signal that clips the amps with no load.  On heavy infra content, the amps clip a fair bit lower than that, so in most cases, my headroom is closer to ~6 dB above the clipping point of the amps.  This means that I can easily exceed 128 dB WCS with content above 20 Hz, but below there I run out of headroom a lot earlier.

I've seen a fair few instances of heavy infra content clipping the amps, depending on my level choice and other parameters (HTTYD crash, TIH boxing / body slam?, a couple points in SW:TFA+BEQ), but this is the first time I've seen clipping on the digital output stage.  That suggests to me that there were insane amounts of infrasonic content in those scenes, which doesn't exactly line up with what I see in the PvA.  At the same time, you seem to indicate that the PvAs appeared very similar between the two tracks, apart from different overall levels.

Is it possible that, even though the aggregate PvAs looked similar, the distribution of low frequency energy between the different channels was different between the two tracks?  So maybe in the DTS track, the LFE was filtered a lot less than in the Atmos track, but the LCRS were filtered a lot more?  If so, I can see how this could lead to a track that's much hotter in the infra after applying this BEQ.  I guess I'll have to do my own analysis when I have the capability.

Share this post


Link to post
Share on other sites

"Is it possible that, even though the aggregate PvAs looked similar, the distribution of low frequency energy between the different channels was different between the two tracks?"

This is what I think happened, and constructive interference with bass management took  things to another level.

JSS

  • Thanks 1

Share this post


Link to post
Share on other sites

Pacific Rim 2 is disappointing with BEQ.  While most effects gain a little, it was not as huge a difference as the PvA would lead you to believe.

JSS

Share this post


Link to post
Share on other sites
On 3/25/2018 at 6:42 PM, maxmercy said:

Valerian and the City of 1000 Planets:

5ab83ed471f1f_ValerianPre-Post.thumb.png.5fef2e09afb606d10421176df03dd92b.png

Good improvement on this one, esp the Intruder scenes.  Tough correction, lots more infra in C than in LRS.

I watched this one today.  The movie itself was kind of funky, but I appreciated it for what it was and would watch it again.

Spectacular video and audio on this one.  Center channel dialog track sounded a bit full in a lot of places, but otherwise, the sound was excellent.  (At some later date, I might try to re-EQ the dialog to fix it up.)  The Atmos surround effects were some of the best I've experience, despite my sitting outside the MLP  on a 5.1 system.  The sub bass effects sounded more distinctive and somehow imaginative than a lot of movies.  I was often surprised by how laid back the mix was.  It seems to fit the feel of the movie.  I watched at "-4" and probably could have gone higher if my subs weren't already at their limits.  (If only I had the floor space and the money, I could easily make use of 8 x UH-21" in here.)

Anyway, thanks for the BEQ on this one.  The restored ULF seemed to contribute a lot to the sound effects, and not just heft.  In fact, most of the bass in the movie seemed quite tight and transient, except where it was obviously not supposed to be (some scenes with music).  I've noticed before that the restored ULF can actually make the sound seem tighter and more precise.

 

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×