MultEQ Target Curves

What frequency response target is optimal?

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36 Comments

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    Audyssey Labs

    Hi Andy,

    Audyssey uses a nonlinear weighting method to combine the measurements in your room in order to determine the response.  You are correct in saying that simply flattening the steady state response results in sound that is too bright.  There are acoustical and perceptual reasons for that.  Our research has shown that the EQ is needed over the entire range.  The weighting of lower frequencies, however, is important and that is part of the algorithm.

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    Audyssey Labs

    Hi Mark,

    The Front Bypass mode does not apply Audyssey to the front speakers at all.  

    It is not a mode that we recommend or support.  The Flat setting is too bright in most rooms so this is why we developed Audyssey Reference with a slight high frequency roll off.

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    Audyssey Labs

    You need to use multiple points to create a gentle shelf up

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    pepar

    I have had some success in adding some needed "air" to my system by tweaking the target curve.  In re the Audyssey Reference Curve, I have a 12k handle at .5dB and one locking 24k at 0dB, and a +2dB handle at 20k.  I have listened to 2-ch CDs, hi-res multichannel, concert Blu-rays and action movies with these tweaks and I think it is an improvement over what I had before.  

    I'd like to lock 13k-14k at whatever it is now and try lifting 20k by another .5dB, but I don't know how far above Reference it is now at 13k-14k.  Is there a way for me to determine that?

    Thanks, Jeff 

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    Audyssey Labs

    Hi Robert,

    The Audyssey Reference and Audyssey Flat curves are identical in the low frequency range. They only difference is in the high frequencies where the Ref. curve has a roll off.  It is possible that this is giving the proper balance and that the bass lines are now clearer.  There is a psychoacoustic relationship between the high and low end and the balance between the two.

    Your room is quite large and so I wouldn't put it in the "highly treated" category.  Keep in mind that too much absorption is not a good thing.  There is a "just right" amount that is determined by the acoustical properties of the room.  

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    pepar

    ooops, mine if boosted 2dB at 20KHz with "anchors" at 22KHz and 12KHz.

     

    jeff

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    Audyssey Labs

    Are you starting from the High Frequency Roll Off 1 (also known as Audyssey Reference) curve?  If so, 13 kHz is down about 3 dB from flat

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    robert Carman

    Thank Chris, that does make sense....the bass seems a bit claerer (more pronounced) because it is not overwelmed by the higher frequencies. I am adding some diffusion also...in the pic I only have absorbition as reccommended by Auralex. I thought I was loosing detail at first with the Audyssey curve but after listening (Tested it with my game system) it seems more corect. I will admit I like high pitched sounds LOL!! So you do NOT reccommend the Flat curve at all (Except for music)? The flat curve does sound better than it did.....the treatments helped.

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    pepar

    Any suggestions/guidelines, Chris, for target curve editing to tweak for a room/system that seems to need just a little more (or less) on the high end than the default?

     

    Jeff

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    pepar

    Yes, Chris, thanks .. I am starting with HF Roll Off 1. 

    I worked through it by trial and error. I maximized the Curve Editor screen and captured it.  Then I edited the curve in a spreadsheet to have an additional .5dB boost at 20k and a handle at 14k, saved it, loaded it, captured it and alt|tabbed between the two JPEGs. I repeated the editing (the 14k handle), loading, etc, steps until the 14k points on the +2.25dB/20k curve and the +2dB/20k curve matched. Hope that makes sense. :)

    What I've got now is 10k/0dB, 12k/.25dB, 14k/.7dB, 20k/2.25dB and 24k/0dB.  +2.5dB at 20k was too brittle, so I backed it off a bit. I am amazed at how much difference a 1/4 db makes at the higher frequencies.

    Jeff

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    Audyssey Labs

    I wouldn't recommend the Flat curve unless you have a smaller room with a lot of absorption--none of which seem to apply in your case.  Best to test with film content on Bluray.  Game content is mixed under unknown conditions and is probably not the best choice to decide on a reference curve.

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    doug weiss

    I have  a challenging situation (denon 4311 with your pro kit and it's tuned).  Room sounds wonderful..huge diference with/without audyssey.  The problem is that my wife  has trouble hearing dialog when watching HBO and some other 5:1 movies.  This is, as far as I can tell, due to poor mixing of the balance between music/background noise and dialog in 5:1 mode....the dialog is even clearer to me in stereo mode.  All speakers, by the way, are NHT and are from the same family so there is nothing strange between speaker design or sensitivity.  One clue is that my wife hears the dialog much better on our bedroom TV which only uses the speakers built into the TV (stereo).  I would say it's a sign of hearing loss (which she has) but I can hear the difference too...and my ears are just fine. (she does have some hearing loss, but not enough for hearing aids at this point).

    I'm looking for a starting point adjustment curve to customize the audyssey target curve (using the pro kit) to boost the presence/dialog just a little.  Which frequencies would I tweak up/down and how much.....at least that would give me a starting point to see if this approach helps.

     

     

     

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    Audyssey Labs

    Hi Rickard, yes that is correct.  You can now select the curve manually.

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    robert Carman

    You are spot on again Chris....I thought I was loosing detail and I added som diffusion on my back wall and above MLP and it is unreal and I mean the best sound I have ever heard from my systyem and that is with the Audyysey curve. Hands down the best!

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    Audyssey Labs

    H Doug,

    There are a couple of ways to do this:

    1. Turn on Dynamic Volume on Heavy and then turn up the AVR volume until the dialog is loud and clear.  You won't have to worry about things getting too loud

    2. Change the target curve in MultEQ Pro by adding a boost centered at 1500-2000 Hz

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    pepar

    Sorry, Chris.  If an edited target curve has been loaded from MultEQ Pro, does the "Music" setting offset the custom curve by the same amount that it would the Audyssey Reference curve?  IIRC, when this came up with Denon, the answer was yes.

    Jeff

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    Spyder

    All systems use the same curve?

    From 2EQ to MultEQ XT32

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    pepar

    Would that be fixed offsets to the curve that apply equally even if there is a Pro-customized target curve being used?

     

    Jeff

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    Audyssey Labs

    Yes, the target curve is the same for all.  But, of course, the ability to achieve it depends on the resolution of the filters.

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    Rickard L

    Hi, I see in the manual for the new Onkyo TX-NR1009 that there are two target choices: Movies and Music.

    Has Onkyo *finally* implemented an explicit "flat" target choice or is Music something else than a flat target?

    from page 53:

    Movie: Select this setting for movie material. The Audyssey indicator lights.

    Music: Select this setting for music material. The Audyssey indicator lights.

     

    Thanks,

    Rickard

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    Audyssey Labs

    Hi Rob,

    It's not generally something that we publish.  The curve is flat out to about 8 kHz, then dips to about –2 dB at 10 kHz and then a little more at 20 kHz.  It's based on our multi-year experience with measurements in studios and a database of several thousand rooms that we have collected.

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    Audyssey Labs

    Contrary to popular belief, a target curve that is flat from 20 Hz to 20 kHz is not always the one that will produce the correct sound. There are several reasons for this including the fact that loudspeakers are much more directional at high frequencies than they are at low frequencies. This means that the balance of direct and room sound is very different at the high and low ends of the frequency spectrum.

    The Audyssey Reference target curve setting (also called Movie in some products) makes the appropriate correction at high frequencies to alleviate this problem. A slight roll-off is introduced that restores the balance between direct and reflected sound.

    The Audyssey Flat setting (also called Music in some products) uses the MultEQ filters in the same way as the Audyssey curve, but it does not apply a high frequency roll-off. This setting is appropriate for very small or highly treated rooms in which the listener is seated quite close to the loudspeakers. It is also recommended for all rooms when the receiver is in THX processing mode. This allows THX re-equalization to operate exactly as it was intended.

    Some manufacturers have decided to implement a Bypass L/R (or Front) setting.  This uses the MultEQ filters that were calculated for the entire listening area, but it does not apply any filtering to the front left and right loudspeakers. The average measured response from the front left and right loudspeakers is used as the target curve for the remaining loudspeakers in the system. The subwoofer in this case is equalized to flat as is the case for all the settings described above.  This is not a setting recommended by Audyssey.

    In some products, there is a Manual EQ setting. This is a traditional parametric equalizer that does not use the MultEQ filters or the Audyssey measurement process at all.

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    Audyssey Labs

    Jeff, I'm not sure I understand the context of the question...

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    Rob Brooks

    Chris, 

    Where would I find a graphic representation of the "standard" Audyssey target EQ curve.

    i.e the target SPL of each frequency band (measured at reference level)

    Specifically for MultEQ XT equipped devices.

    or is this not available 

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    Hemal

    Hi Chris,

     

    What target curve should be used when playing music?  I'm using a Denon 2310, KEF3005SE and B&W PV1 in a small room.

     

    Thanks in advance,

     

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    Audyssey Labs

    Ah. Got it. The amount of offset (in dB) that you apply in your edited curve will be applied to the selected target curve.  

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    Robert M. Bridi

    Hi Chris,

    Are all the MultEQ XT curves in different products the same?  For example, on the NAD website under the T 775HD2 A/V Surround Sound Receiver Features it states "Audyssey MultEQ XT Room Correction with custom NAD developed target response curves".  Is the curve in my Denon AVR-989 which has MultEQ XT the same as that in the NAD T 775HD2?

    Thanks in advance.

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    Audyssey Labs

    Hi,

    There is no standard music target curve as there is for film content.  We recommend starting with the Audyssey curve, but also trying the Flat curve.  In a small room Flat could work better for some types of music.

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    pepar

    Thanks!

    Jeff

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    Audyssey Labs

    Hi Robert,

    NAD has their own target curve that is found on NAD gear.  It's very similar to the standard Audyssey curve found in all AVRs.

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