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Originally Posted by
ls7z06 
I am a little confused about some of the info from the very helpful post number 1. The first issue relates to adjusting Intellivolume for boomy bass. The post says to adjust Intellivolume to 0dB for movies, 5dB for classical, 10dB for jazz and TV, and 15dB for rock. I think that means IF you need to correct for boomy bass??
Yes.
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And should it be -5, -10, and -15dB if you are correcting for boomy bass rather than +?
Yes. By lowering the input level, you decrease the level of effect Dynamic EQ applies.
The numbers are an example only, taken from the more recent models which
implement an Audyssey Offset.
Dynamic Eq is/was designed for *movies*, not music content, see more at the end.
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And does that mean you need to do that manually every time you change media styles??
I think Intellivolume can only be differentiated by source, not by listening modes.
Well, yes. The easiest way is to adjust it for music only sources such
as CD and Tuner. If your setup is different such as combining CDs with
DVDs/Bluray, then you have to adjust it manually.
But then again, it is *only* if you feel the bass is overpowering when
listening to music.
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Then... the second issue relates to Multi EQ 9dB boost. I think it says that Multi EQ can boost the signal by up to 9dB. Therefore you should make sure it can never boost beyond 0 dBFS by doing something?? Dropping the digital signal level? Does that mean to reduce Intellivolume by -9dB?? or to reduce individual speaker trim by that amount?? or something else? And if my first paragraph above is answered by increasing Intellivolume by those amounts, how can you then reduce them by -9db as well??
Obviously I am really confused here and appreciate any help.
You don't need to worry about the max +9dB boost. It is internal to MultEQ
and you never need or should adjust anything with regards to that.
It is just mentioned for those who thought that MultEQ would blow their speakers
if boosted enough. The input level is dropped by 9dB first and then the cuts
and gains are applied so the output level will never be above the initial level.
That is why the overall level is somewhat lower with Audyssey engaged.
And, it has nothing to do with the trim levels for the different channels.
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My last question has to do with establishing reference level definition. As I understand the post, if I am listening to a movie, and have leveled my speakers at 75dB, and have disabled any Intellivolume impact, and regardless of whether I am in Dynamic EQ or Multi EQ mode, with master vol control set to 0, that is reference level?? I also assume that is with a bit streamed input?? That is really LOUD if I understand that right.
Yes, reference level is pretty loud and most people never listens at that volume
which is why Dynamic EQ exists.
Here are some quotes which describes it and
also the part about music sources...It addresses human hearing changes as the volume is lowered.The first thing that diminishes at lower volumes is our perception of bass, so Dynamic EQ boosts it according to a setof curves that match human perception.The second thing that changes is our perception of surround impression, so Dynamic EQ boosts the surround level as youlower the volume. Content has soft and loud parts that change moment by moment.When the volume is turned down, the softer parts need more correction than the louder parts because they fall ondifferent perceptual listening curves.So, Dynamic EQ monitors the content in each channel with a real time loudness meter and makes continuous adjustments topreserve the correct balance.The idea with Dynamic EQ is to turn the volume down to where you like it and it will adjust the responseand surround envelopment for you. It's made for listening at softer, not loud, levels.If you are at exact reference level (0 on the master volume) then Dynamic EQ is turned off.As you go down from there it starts to operate. The further you are from reference, the more Dynamic EQ is doing.Its function is to maintain the same perceived frequency response and surround levels as what you get at reference volume.These degrade rapidly as you go down from referenceDynamic EQ assumes that the content you are playing was mixed under the exact same conditions. All movies are mixed indubbing stages that are calibrated under these exact same conditions. Mixers make decisions on the balance between lowand high frequencies while listening at these levels. And they also make decisions about the level of the content in thesurrounds.When you turn the volume down below reference (i.e. below 0 on the master volume) then you are listening at a loweroverall volume than the mix was created. Our hearing is such that this affects our perception of bass and our perceptionof surround impression. So, gradually, as you start to turn the volume down from 0 Dynamic EQ starts to compensate forthese two things more and more.Now, if you play music that was mixed in a studio that is not calibrated to this level (most are not), then 0 on yourmaster volume is NOT the same level as the mixers heard. That means that the adjustments that Dynamic EQ starts to makemay be too strong because it is assuming that it must stop at 0.Since we can't change the music industry to follow one standard, the next best thing is to provide a method to offsetDynamic EQ from the film standard. You can do that by turning down the input trim for the music content input on the AVRand turning up the master volume by the same amount. You will be listening at the same perceived level, but Dynamic EQwill be applying less overall compensation.
