Two Acclaimed Bass Heavy Scenes, Two different outcomes. - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 24 Old 03-29-2017, 03:26 AM - Thread Starter
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Two Acclaimed Bass Heavy Scenes, Two different outcomes.

HI,

I have dedicated home theatre, with SVS pb-2000 sub. You can see details here:
https://www.avsforum.com/forum/15-gen...completed.html

I was demoing "The Best Of The Demo Discs Demo Disc" and noticed:

Finding Nemo - Darla:
This scene really shook all the couches to their core. The bass is so much that I could feel my whole body being shaken.

Master and Commander - Battle
Absolutely no shaking whatsover. I could 'hear' the blast somewhat but the couches didn't shake at all. Is there something wrong with my system.

Thanks

Last edited by hussain; 03-29-2017 at 06:16 AM.
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post #2 of 24 Old 03-29-2017, 05:43 AM
 
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Quote:
Originally Posted by hussain View Post
I have dedicated home theatre, with SVS pb-1000 sub.
Only one?
Quote:
Is there something wrong with my system.
Maybe. To be sure you'd have to measure the room response. With only one sub you probably have nulls at some frequencies, only by measuring the room response will you know.
LFE effects aren't real, they're generated. You could have a situation where the effects on one DVD are mainly generated at a frequency where your system is working correctly, while those on another DVD may be generated at a frequency where you have a response null. By the same token the effects on one DVD may be generated at a higher frequency, where your system is working well, while another DVD effects may be at a lower frequency where your system is lacking.
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post #3 of 24 Old 03-29-2017, 05:55 AM
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Quote:
Originally Posted by Bill Fitzmaurice View Post
Only one?


Quote:
Maybe. To be sure you'd have to measure the room response. With only one sub you probably have nulls at some frequencies
Try walking around the room during the M&C scene. If you hear a difference, nulls are your problem, an additional sub is the solution.

Glad you like the disc.
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post #4 of 24 Old 03-29-2017, 05:55 AM - Thread Starter
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So how can I do that

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post #5 of 24 Old 03-29-2017, 06:01 AM
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Do what, walk around the room?

Okay, measuring:
https://www.avsforum.com/forum/91-aud...et-graphs.html
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post #6 of 24 Old 03-29-2017, 06:19 AM - Thread Starter
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Quote:
Originally Posted by LastButNotLeast View Post



Try walking around the room during the M&C scene. If you hear a difference, nulls are your problem, an additional sub is the solution.

Glad you like the disc.
Michael
On your system would you say that Darla and M&C scenes are equivalent? I walked around the room and still felt nothing on the M&C scene.
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post #7 of 24 Old 03-29-2017, 06:22 AM
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Quote:
Originally Posted by LastButNotLeast View Post
It's buried a little bit, so I thought I'd make it a little easier - here's another key player in the guides you'll need: REW101 - Getting Started with REW A Step by Step Guide.

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post #8 of 24 Old 03-29-2017, 06:23 AM - Thread Starter
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Quote:
Originally Posted by LastButNotLeast View Post
Do what, walk around the room?

Okay, measuring:
https://www.avsforum.com/forum/91-aud...et-graphs.html
Michael
I have onkyo 5010 so room equalization for speakers is already done. can somebody tell me in few simple lines how to measure subwoofer response and find out if I am having nulls.
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post #9 of 24 Old 03-29-2017, 06:27 AM
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They're not equivalent; they're different. Without measuring the frequency response of the scenes (which I'm sure I did at some point, but I don't keep that stuff around), I can't tell you where the most response is.
Lots of interesting info here:
https://www.avsforum.com/forum/113-su...cy-charts.html
You should download REW and use the generator function to generate test tones. You will be able to notice if there's a drop-off somewhere.
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post #10 of 24 Old 03-29-2017, 06:31 AM
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Quote:
Originally Posted by hussain View Post
in few simple lines
No, but Jerry's guide is great.
For now, don't get hung up on getting measurements (unless you want to, of course - see "rabbit hole"). Generate some test tones and let us know what you hear.
Michael

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post #11 of 24 Old 03-29-2017, 02:26 PM
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This is the frequency spectrum of Darla tapping the fish tank:



This is the exchange of cannon fire in Master & Commander:



Notice that the Darla scene has deeper bass and less of other frequencies than M&C. M&C is a good example of the value of mid-bass modules. Or, as I've done, a change in house curve from a slope that ends around the crossover (~80Hz) to one that extends out to ~200Hz. And an MBM.
This is where measuring and experimentation are essential, but I think now you can see why you notice a difference.
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post #12 of 24 Old 03-29-2017, 07:07 PM
 
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Quote:
Originally Posted by LastButNotLeast View Post
Notice that the Darla scene has deeper bass and less of other frequencies than M&C.
M&C has most of its energy centered around 40-60Hz. Normally that would be much easier to hear than the octave below that. But that's also where it's common to have boundary reflection sourced nulls. Remove that 40-60Hz content and there's not much left. Remove it from the Darla scene and there's still plenty there to hear and feel.
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post #13 of 24 Old 03-30-2017, 08:24 AM
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if memory serves, I remember reading that the Blu ray version of M&C had much weaker bass than the DVD version. I think I found that out for myself as I still have the dvd version and compared it to a blu ray rental quite a few years ago.
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post #14 of 24 Old 03-30-2017, 10:40 AM
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Quote:
Originally Posted by shivaji View Post
if memory serves, I remember reading that the Blu ray version of M&C had much weaker bass than the DVD version. I think I found that out for myself as I still have the dvd version and compared it to a blu ray rental quite a few years ago.

I remember reading something to this effect as well. I thought it was something along the lines of no content below 20 or 25Hz on the Blu-Ray, while the DVD went lower. Don't remember exactly.
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post #15 of 24 Old 03-30-2017, 12:15 PM
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Correct, here is an old thread that I recall reading years ago regarding Master & Commander on bluray:


https://www.avsforum.com/forum/113-su...vs-bluray.html
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post #16 of 24 Old 03-30-2017, 06:18 PM
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My library has the dvd. I just requested it and will post an update (inquiring minds want to know!).
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post #17 of 24 Old 03-30-2017, 06:52 PM
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Also notice how high the level is that extends to well above the normal 80-100hz crossover point in the M&C graph.

I now have MTM`s in all locations giving me 18,...6.5 inch woofers for that above 80hz content..........big time difference in slam from when I had 7 smallish woofered speakers in the above XO content and it is not a brick wall XO, so even the 70hz content got a good boost as measured in REW.......makes a difference.

Link to Stereo Integrity SI HT 18 sub build......https://www.avsforum.com/forum/155-di...-pedestal.html
Speakers and subs for sale...https://www.avsforum.com/forum/209-au...kers-subs.html
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post #18 of 24 Old 03-31-2017, 03:07 PM
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Definitely a difference. DVD has two audio tracks, DD and DTS, clip available here:

https://www.4shared.com/video/VH5SNu...aster_DVD.html

Same scene:
DVD:



BD:



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post #19 of 24 Old 03-31-2017, 03:17 PM
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And, just to make sure the comparison is as fair a possible, this is the first 218.5 seconds of each of the clips:

BD:



DVD:



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post #20 of 24 Old 03-31-2017, 06:55 PM
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I could use a graph reading interpretation as I am a bit graph challenged.
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post #21 of 24 Old 03-31-2017, 07:30 PM
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Frequency along the bottom (x-axis ), bass to the left, height on y-axis indicates how much.
DVD graph shows more bass than BD graph, which you would think is counter-intuitive, which is why there has been discussion about it (you would expect a BD to have "better" sound than a DVD. In this case, it is high def, but the bass is definitely lacking in comparison).
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post #22 of 24 Old 04-03-2017, 09:21 AM
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I'm not seeing any graphs. Am I the only one?

I turn the sharpness on my TV all the way up, because that's how I like my picture... real sharp.


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post #23 of 24 Old 04-03-2017, 01:13 PM
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Yup.

On a mobile device?
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post #24 of 24 Old 04-03-2017, 01:29 PM
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No, not mobile. Work PC. Tried IE, Firefox, and Chrome.


Will try when I get home. Thanks for the reply.

I turn the sharpness on my TV all the way up, because that's how I like my picture... real sharp.


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