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maxmercy last won the day on January 8 2020

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About maxmercy

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    Lots of stuff....too much, in fact

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Ultra Bass Overlord

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  1. I see what you mean, I was only talking about ELC and how it relates to my experiences with both sinewaves and real content, in a "high fidelity" system. I agree, linearity is a huge deal. Listening/feeling experiences with an old system of mine with large peaks at 30 and 60Hz were significantly different from a later system that had much better control of the room via acoustic treatment, mode cancellation via multiple subs, proper headroom and proper seat placement with some EQ thrown in to tame the largest leftover resonances...that system was very good. What is strange is that in some movie scenes, the tactile effect of the old, peaky system was far more present. Complex subject indeed. JSS
  2. The article listed on that page: http://www.filmaker.com/papers/RM-WhtPpr_Subwoofer Camp.pdf Brings up something that few do, except MonteKay: http://www.mfk-projects.com/Home_Theatre/theatre_woofer.html It is a very important point. Due to the way our ears 'hear', a near infrasonic sound must be played back more cleanly than a midrange sound in order not to have upper harmonics 'color' it due to equal loudness curves. I did several experiments with my first decently low distortion subwoofer system and it is enlightening seeing total harmonic distortions of just above 1% significantly coloring a pure sinewave tone upon playback at louder levels. Of course, at loud enough levels, things rattling in the room 'color' the sound far more, until you start fearing for the structure. Clean reproduction of bass is very difficult. If you can play a 20Hz tone and with your eyes closed you can point to where the subwoofer is in the room, it is anything but a clean reproduction. JSS
  3. I have this film, and this it how it graphs. From about 1:33 to about 1:39, there is a strong 20Hz effect, you can see it in the average and peak graphs. At one point it is encoded as hot as 108-109dB If played back at 'Reference Level'. With a real low distortion playback system, it would lend an ambience to a scene that many would find disconcerting. Low distortion 20Hz playback is rare to achieve. JSS
  4. Are the t.amp amplifiers readily available in the US? JSS
  5. Very nice! My first sub was definitely not that well finished.... Glad you are enjoying it, but welcome to the rabbit-hole. You may have just opened the Pandora's box we all have at one point or another... JSS
  6. Updated the first post links to the corrections. More BEQ to come, starting with the Lord of the Rings trilogy. JSS
  7. Interesting question, but I do not know what will happen sim v reality for this. Will you have shaped and non-shaped cabs built to compare? JSS
  8. Interesting....they are quite different, windows could account for it, but the level differences are what I see as most prominent. I wonder if the DTS-HDMA and ATMOS tracks have different dialnorm settings, or something else. JSS
  9. I have not seen that many films this year, lots of reasons why; I have not had the chance to measure that many either. So far, the PvA for Ad Astra above looks pretty good, but I have to see it. This year I mainly did some BEQ for the films I did buy and see on BluRay, like Avengers:Endgame, Godzilla and Bumblebee, and really looked into the LOTR trilogy as we are nearing the 20th anniversary time on it. It is one of the film trilogies that did not get a decrease in LF from DVD to BluRay, which was very nice. JSS
  10. Godzilla: King of the Monsters - Dolby ATMOS (7.1 channel bed) Level - 5 Stars (112.7dB composite) Extension - 3 Stars (19Hz) Dynamics - 3 Stars (24dB) Execution - TBD Overall - TBD Notes - Loud, but not deep. Very much like Pacific Rim in the rolloff slope. BEQ for this film in the BEQ thread. JSS
  11. I did a BEQ for Godzilla, let me look back and post up stats for it later this week. I have not measured Overlord. JSS
  12. 1) Yes 2) Some receivers let you know how much correction they are applying as the track first plays. On my Denon, once the main movie fires up, it will display the bitstream (DolbyTrueHD/ATMOS), and then for a second or two, Dialnorm -4dB. You can then turn up the film by that amount to have the equivalent presentation. If you run at the high SPL end of things, turning up the MV by that much can make someone a little nervous if they run at the edge of their system's capabilities. 3) Dialnorm in theory has good uses, especially in TV production. I have mainly found it annoying, but that is due to my personal experience (and frustration at times) with it. I just see it for what it is, another bit of metadata DTS and Dolby provided so people could have an option to use it. Few DTS mixes have dialnorm, but they are out there. When I examine the audio in a film, I remove dialnorm so I can see clipping more easily when it happens. Like I said above, I remember playing scenes from Transformers 2 over and over at the same MV level and getting pretty annoyed at the IMAX mix. I had convinced myself it was a dynamics/compression change, when in fact, it was just a turn of the knob. 4-5dB can make a huge difference in perceived impact at the MLP. If you have a clean system, play the Star Trek 2009 warp scenes at your cleanest high SPL level, then turn it down by 4-5dB and feel the difference.... I also remove dialnorm when I BEQ a film. Maybe I need to specify if a mix has dialnorm or not in the BEQ correction so people can set the best MV level. JSS
  13. Here's how they compare with dialnorm accounted for: Now that may account for some bad reviews from ppl listening from AVRs. JSS
  14. I have a possible answer. I went back and looked at the track data for the ATMOS and DTS tracks. The ATMOS track has a -26 setting for dialnorm, which means your AVR will reduce the overall volume by 5dB. I experienced the same thing with Transformers: Revenge of the Fallen. The regular edition was DTSHD with no dialnorm applied, the IMAX edition was Dolby TrueHD, with dialnorm applied at -27. When you changed the level to account for dialnorm, the mixes were much more similar. If you listened at your normal level, the IMAX version seemed to lack dynamics. But in truth, it was just being played back 4dB lower. My experience with it: https://www.avsforum.com/forum/113-subwoofers-bass-transducers/755493-master-list-dvd-hd-dvd-blu-ray-movies-bass-thread-waterfalls-123.html#post17394243 keep reading and you'll see echoed many similar sentiments about SM:FFH Great article on dialnorm: https://hometheaterhifi.com/volume_7_2/feature-article-dialog-normalization-6-2000.html JSS
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