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This topic contains 4 replies, has 3 voices, and was last updated by avatar Jason Hicks 5 years, 6 months ago.

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  • #114

    I am curious about the specifications of the EQ features in the Bravus subs.  The Low Bass Adj.  what frequencies does it boost/reduce?  Also, in the Para Eq. Width setting, what are the frequency ranges for wide, normal, and narrow?  Also, if I wanted to boost the lower frequencies, would it be advisable to use the Low Bass Adjust or to use the Para Eq. set to a low frequency and the Para Eq. Level above 0db to boost it?  Sorry if I am asking this question due to not understanding the features.  If that is the case I woould love some help/resources in learing more about them.

    #928
    avatar
    Russell
    Member

    [quote user="jaylundgreen"]I am curious about the specifications of the EQ features in the Bravus subs.  The Low Bass Adj.  what frequencies does it boost/reduce?  Also, in the Para Eq. Width setting, what are the frequency ranges for wide, normal, and narrow?  Also, if I wanted to boost the lower frequencies, would it be advisable to use the Low Bass Adjust or to use the Para Eq. set to a low frequency and the Para Eq. Level above 0db to boost it?  Sorry if I am asking this question due to not understanding the features.  If that is the case I woould love some help/resources in learing more about them.[/quote]

    I ask similar questions a few weeks ago.  Below is the exchange

     


     Russ:

    I would like to get some more detailed specs on the Bravus, my 8D specifically.  

    1) Low bass boost – What range does it boost and how much?

    2) Parametric Equalization – The width of the narrow, normal and wide ranges?

    3) Modes – What are differences in the 3 modes, all other settings being the same?

    4) Settings – What settings are stored per mode? 

    Cheers 

     

     

    Thanks for your patience while I got back to you Russ. 

    Ok, so for the low bass adjust, it's a shelf filter that boosts or attenuates all the way from 0 Hz to 80 Hz.  The height of the shelf is up to 6 dB, and you move the entire shelf by 1 dB with each adjustment that you make on the sub.  The curve of the shelf back down to the baseline starts at about 30 Hz.  Once you get to 50 Hz you're at the half way point down the curve with respect to 30 Hz and once you reach 80 Hz you are almost all the way back to the baseline.  

    As for the parametric EQ, each change in the level (+1 or -1) will change the peak of the effected frequency band by 1.5 dB.   The Q value for the "wide" setting is 2.0, for the "normal" setting it's 3.5 and for the "narrow" setting it's 6.0. 

    I'm sure you are familiar with the Q parameter, but for folks that aren't, it refers to the width of a range of frequencies.  As you can see the Q factor is inversely proportional to the width, so at a low Q factor a larger range of frequencies are effected in comparison to frequencies that are within a high Q value. 

    You might also be interested to know that there is some EQ built into the sub that you cannot alter that we used to compensate for the small size of the box.  Specifically in the 8D, the 36 Hz band has a 7dB boost with a Q of 1.5.  There's also a 5 dB cut at 65 Hz with a Q of .5. 

    I hope that helps but please let me know if you have further questions, thanks! 
     

     Cheers 

    #490

    I appreciate you posting this, but I don't understand it at all.  Is there a magazine article out there or other resource that I can go to learn all about what all these curves are?  If the Low Bass Adj. boosts or attenuates from 0hz to 80hz in dcibel increments of one all the way from -6 to +6 that part I understand.  But the baseline and the curve stuff lost me.

     As for the Para EQ, the explanation wasn't totally lost on me.  But let's just say that I choose 50hz as the para eq frequency does normal width setting make the range from say 30 hz to 70 hz with 50hz being in the middle?  And wide makes it from 20 hz to 80hz and narrow from 40hz to 60hz?  Or is it not that simple?  I wish there was a way to turn the para eq on/off with a single button press to do some back and forth comparisons and I wish the para eq settings were available for music, movie and game so they could be saved individually, but that is just the OCD talking.

    #491

    Is setting the low bass adjust at 0db the same as having it on bypass?

    #1193
    avatar
    Jason Hicks
    Member

    [quote user="jaylundgreen"]Is setting the low bass adjust at 0db the same as having it on bypass?[/quote]

     

    That is correct.

     

    So as far as the shelf filter goes, it looks something like this:

     

     

    So what you are doing when you change the low bass adjust value is moving the flat part of the curve up and down.  Now that's just a generic graph that I found, but in our example if you imagine that along the x axis 1 is 20 Hz, the 10 is 50 Hz and the 100 is 80 Hz and the y axis is from 0 dB to 6 dB that would be a close representation of the low bass adjust filter.   

    You have the basic idea with the Q factor, but determining the actual freqs effected involves some calculations that aren't my strong suit, but you can check out the formulas here:

    http://en.wikipedia.org/wiki/Q_factor#Calculation_of_Q

    I hope that helps, but at the end of the day if you don't completely understand all of theory behind how this stuff works I don't think it's worth losing any sleep.  There's absolutely nothing wrong with fiddling with all the settings and finding what sounds best to your ear, because really that's the most important thing.
     

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