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Posts posted by 3ll3d00d

  1. That would be great.  I learn better by seeing an example.


    All of these are entered via the PEQ block in DSP studio. Note that if the PEQ block is before room correction then subwoofer means the LFE input channel, if the PEQ block is after room correction then subwoofer means the physical subwoofer output channel. You want the PEQ block to be *before* room correction. 


    1. Gain -4dB

    Click add/adjust volume

    Enter -4

    Select subwoofer from the channel dropdown




    2. Low Shelf 15Hz, Q of 0.94, +6dB 

    3. Low Shelf 15Hz, Q of 0.94, +6dB

    As per the previous post, this is not directly supported in jriver so you have to approximate.


    Click add/adjust low frequencies (low shelf filter)

    Enter frequency 15

    Bandwidth 1

    Gain 6

    Select subwoofer from the channel dropdown





    4. Peak 19Hz, Q of 2, +6dB

    Click add/adjust low frequencies (low shelf filter)


    Enter frequency 19

    Bandwidth 2

    Gain 6

    Select subwoofer from the channel dropdown




    You can now just repeat the same procedure for the next block, just choose the relevant LCR channels from the channel dropdown instead of subwoofer.


    EDIT: see next post, the filters might need fine tuning for use with jriver.




    1. Gain -4dB

    2. Low Shelf 15Hz, Q of 0.94, +6dB

    3. Low Shelf 15Hz, Q of 0.94, +6dB

    4. Peak 19Hz, Q of 2, +6dB


    This is a v steep LS that has some overshoot at the top and bottom of the shelf isn't it? I guess this is because you wanted a steeper rise from the shelf?


    A low shelf with this Q is not supported directly by jriver. It's low shelf is described in terms of Q but, as I understand it, it really mean S (shelf factor) and it limits this to a max of 1. The formula to convert Q to S is listed in http://www.musicdsp.org/files/Audio-EQ-Cookbook.txtand is


    1/Q = sqrt((A + 1/A)*(1/S - 1) + 2)




    A = 10^(dBgain/40)


    If you solve for S you get 1/((((1/Q)^2-2)/(A+1/A))+1) which means you'd need jriver to accept a value of ~1.7 for the LS


    If you go with a shelf with a S of 1 (roughly a Q of 0.707 in the minidsp terms) and increase the gain to 6.2dB then you get the following; black is your version, brown is what jriver can support. I suppose this is close enough?



    • Like 1
  3. OK. That. makes sense. Maybe some one can make a sticky on how to do this with Jriver, like there is a sticky when using that other device, if there are people who use Jriver. I just want to know that this can be done for individual movies. I would really like to try this so I can report back what I find.


    I use Jriver and have applied these sorts of filters before. You just add them to the peq block in the DSP window. I can lost an example later.
  4. I can't find Mojave's tutorial.  I have my mad max bluray in my computer with jriver and speclab waiting.  What do I do?





    I use TSMuxer and only tick the audio track that I want to analyze. I don't see how you can do that with JRiver.


    post 8835 in http://www.avsforum.com/forum/113-subwoofers-bass-transducers/1333462-new-master-list-bass-movies-frequency-charts-295.html#post23468771


    it is page 221 of 566 for me but avs forum software is rubbish so working out a direct link is always tricky, the above is using the default no of posts per page


    There should be a difference in levels of around 4dB going by the rating but I think the voltage out shows a bigger difference. I went to a voltage to voltage level calculator like this: http://www.sengpielaudio.com/calculator-db-volt.htm and when typing in the 2 peak voltages it shows a difference of almost 10dBV.


    I guess I have no idea what the composite levels in dB are related to. Will someone please help me understand this?

    The method for calculating the composite rating is in http://data-bass.ipbhost.com/index.php?/topic/12-the-low-frequency-content-thread-films-games-music-etc/?p=86

    I would think the difference will be that the composite rating considers the whole film not just the most aggressive scenes. I don't see that there would be any difference between a actual voltage based reading and one based on dBFS as long as both are clean and you use an equivalent reference for the max signal.

  6. FWIW I bought mine from seatonsound, it was both cheaper and ships with http://www.neutrik.com/en/audio/powercon/powercon-32-a/nac3fc-hc on the end of the power cable.


    EDIT: actually now I reread my emails I see he said it normally comes with the powercon but he includes a terminated power cable, not clear from the above whether the connector is the problem or the cable. I suppose not such a big deal for us in the UK anyway.

  7. Not sure about the midrange problems you are experiencing.  Do you mean midrange or midbass?


    I'll post up the BEQ correction for Guardians of the Galaxy tomorrow.  It is a substantial improvement.




    I mean midrange, it just didn't seem v dynamic. Thinking about it, this could just be the change in spectral balance as the mains are both absolutely and relatively quieter.

  8. I watched all of PR with the BEQ engaged and my house curve tonight, just a massive difference, quite mental bass. Really nice job done there. I think the mid range was quite bad though, not sure whether that is the track itself being a bit crap or the effect of applying such a strong boost to the low end.


    I have my new sub turning up in the next week (2 * uxl 18) so will have to give it another go once that arrives. I guess I need to get Godzilla now too.


    Keep up the good work anyway!

    • Like 1
  9. This pattern has nothing to do with a house curve being embedded in the mix.  To the extent that this may have been done, it is unlikely one can tell by looking at a PvA.  Instead, what you see in the PvA has more to do with the fact that loudness perception drops off rapidly with decreasing frequency in the sub bass range and also the fact that many natural broadband sounds exhibit an increase in level with decreasing frequency.  For example Brown Noise increases at 6 dB/octave as frequency decreases.  From 30-40 Hz to 130 Hz is about 2 octaves, so a 12 dB difference is, in fact, very reasonable to expect.

    I'd forgotten about this thread - http://www.avsforum.com/forum/113-subwoofers-bass-transducers/1487271-spectrum-labs-different-slope-than-room-subwoofer-frequency-sweeps.html - which goes round the houses on this subject & seems somewhat inconclusive in the end.

  10. I do not run a house curve (not enough headroom under 10Hz to do so), and I only try to get back what I feel was filtered...  It is very hard to explain, but after many attempts at doing this I can come up with a solution for a film in a few iterations without it sounding too bloated, unless the filters are very steep.  Then it is a little tougher.  

    I took a look at an assortment of PvA graphs from the various films in the google docs spreadsheet and they invariably have the same pattern, a 10dB (+/- 5dB ish) rise from ~130Hz to 30-40Hz. This is a pretty good description of the shape of the typical house curve, if not a bit stronger than that. The Q to my mind is whether that house curve is actually embedded at mix time as opposed to needing to be added at home? 

  11. Pacific Rim pre:




    Pacific Rim BEQ:


    attachicon.gifPR71 BEQ.jpg


    This one is SIGNIFICANTLY Improved. 


    Pacific Rim is now near 5-Star with this correction, and from the opening scene with 'Axehead', you know it right away.  I highly recommend people try this one. 



    I don't know how useful this feedback will be but I definitely concur with that "you know it right away comment". I only listened to that opening battle and it does indeed completely change the experience. In my room there is a fairly constant low level tactile sensation while the jaegar is strutting around and then some serious impact when things get going. 


    One question though, do you run a house curve on top of this or is that baked into those settings?

  12. You're welcome. I've had no problems implementing the BEQ filters in JRiver. Basically, I create a custom zone specifically for the movie I'm going to BEQ, and then create the filters for that movie in the custom zone. I then use ZoneSwitch to automatically switch to the custom zone whenever I play that movie.

    Are you using jriver 20? If so, you can assign a DSP config to a specific track now so no need for zone switch for this.
  13. Thanks man, that little blop down to 20hz and a little below right after the roll is what I was looking for. When I had the gratuitous LT going my space, that part was a little hotter than what I see in that graph but really provided a cool effect to say the least. I honestly like that part better than the roll itself :)

    there is something that vibrates like crazy in my room at ~30Hz and so is lit up by that scene, it makes my head feel like it's buzzing which is quite an odd sensation!



    Is that when the plane flips and then right after you get a couple of puffs of wind hitting you?  I have not tried that scene in a while and not since my new sub system. 

    it's the scene where it does a barrel role & the propeller blade comes off the one engine slamming into the side of the plane. I've never seen the rest of the film tbh so not sure if there are other bits like that.

  14. How do I run the output of the amp to the line in?

    I don't know exactly. I googled a bit more on this subject and it seems like it is more involved than I thought, for example http://www.diyaudio.com/forums/everything-else/127882-how-protect-sound-card-during-amp-measurements.html, so basically some sort of resistor network to provide a load to the amp and divide the voltage down to a reasonably level & then possible ground issues to deal with.

  15. I am using a windows 8 computer with hdmi. I have my yamaha AVR hooked up to my Sanway via sub outs. I usually plug the computer HDMI into the AVR HDMI input 4.

    so you have a line in on a soundcard on the computer? if so, you just need to take the output from each device back into the soundcard and measure. You probably want to use a multimeter to check the output from the amp before you do so to keep it to normal line level voltages (or use something like http://www.avsforum.com/forum/155-diy-speakers-subs/1459739-how-determine-your-receiver-s-maximum-lfe-output-gain-structuring.html perhaps?)

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