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#295143 - 03/04/10 09:30 PM Question about Audyssey
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6789
Loc: The Peoples Republic of Il.

While doing some reading I came across this on the Elemental Design website. Just curious who turns their sub off while calibrating their system using an auto calibrating receiver. Or has anyone else heard of such a thing?

I have an older receiver right now but do have plans on updating my system later in this year.


If you have a receiver with built in auto equalization such as Audyssey, we
suggest keeping this turned off. Auto equalization programs have one goal, to get
a flat frequency response for your system. The downfall to these programs is
their inability to know the limits of the subwoofers speaker and amplifier. We
have seen some cases of the program adding upwards of 15-20 decibels at
20hz. Not only is this very demanding of the speaker and amplifier, but it can also
cause damage.
_________________________
Rick


"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud


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#295144 - 03/04/10 09:34 PM Re: Question about Audyssey [Re: Wid]
Adrian Offline
axiomite

Registered: 12/27/08
Posts: 6893
Loc: It's all about the location.
I've never heard of that, but it does make sense when you think about it.
_________________________
Half of communication is listening. You can't listen with your mouth.

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#295145 - 03/04/10 09:36 PM Re: Question about Audyssey [Re: Adrian]
terzaghi Offline
connoisseur

Registered: 04/04/07
Posts: 4870
Loc: Tulsa, Oklahoma
All the audyssey FAQs I have ever read do not recommend that.
_________________________
-David

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#295146 - 03/04/10 09:36 PM Re: Question about Audyssey [Re: Wid]
Glitchy Offline
aficionado

Registered: 01/28/10
Posts: 578
Loc: Blueridge Foothills, NC
 Originally Posted By: wid

While doing some reading I came across this on the Elemental Design website. Just curious who turns their sub off while calibrating their system using an auto calibrating receiver. Or has anyone else heard of such a thing?

I have an older receiver right now but do have plans on updating my system later in this year.


If you have a receiver with built in auto equalization such as Audyssey, we
suggest keeping this turned off. Auto equalization programs have one goal, to get
a flat frequency response for your system. The downfall to these programs is
their inability to know the limits of the subwoofers speaker and amplifier. We
have seen some cases of the program adding upwards of 15-20 decibels at
20hz. Not only is this very demanding of the speaker and amplifier, but it can also
cause damage.


I don't know shat for shinola but I got my EP500 today, the instructions say to turn it to 1/4 volume for "auto-calibration" (but auto-calibration" not recommended)

I have just finished running audyssey and now need to go play with the sub volume
_________________________
Fronts/Wides:M22s in/on
Center:VP150/VP100 in/on
Hghts,SS,SR:QS8s
Sub:EP500
AVR:Onkyo 3008

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#295151 - 03/04/10 10:20 PM Re: Question about Audyssey [Re: Glitchy]
ClubNeon Offline
connoisseur

Registered: 02/06/09
Posts: 3466
Loc: Western Maryland, USA
Interesting. Pioneer's MCACC doesn't really EQ the sub. It only uses parametric attenuation filters to notch out frequencies which build up in the room due to standing waves. It then may apply a little positive "trim" to the over-all signal (I've never seen more than +3 dB) to get the best possible average level.
_________________________
Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris

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#295152 - 03/04/10 10:47 PM Re: Question about Audyssey [Re: ClubNeon]
Glitchy Offline
aficionado

Registered: 01/28/10
Posts: 578
Loc: Blueridge Foothills, NC
I sortof hate this fact ... I've been looking for HTPC, audio, video nirvana for a while now ... I'm getting old and want the easy way out ... push a button I'm in
_________________________
Fronts/Wides:M22s in/on
Center:VP150/VP100 in/on
Hghts,SS,SR:QS8s
Sub:EP500
AVR:Onkyo 3008

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#295153 - 03/04/10 10:47 PM Re: Question about Audyssey [Re: ClubNeon]
grunt Offline
connoisseur

Registered: 12/04/06
Posts: 3569
Loc: Nirvana
From the Audyssey FAQ:

http://www.audyssey.com/technology/faq.html#overdriving

 Originally Posted By: Audyssey


Is there a danger of overdriving the loudspeakers by using MultEQ?

No, MultEQ filters are calculated by taking into account the capability of the loudspeaker and the overall gain structure of the system. Limits in correction are imposed at each frequency to prevent the loudspeakers from being overdriven.


So according to Audyssey at least it is not an issue. Also Iím not sure a sub like the EP500 would be in danger either because wouldnít itís own DSP chip prevent it from being overdriven or am I mistake about how that works.

 Originally Posted By: Audyssey

How well does MultEQ work at low frequencies?

This is one of the unique strengths of MultEQ. Room correction methods based on parametric equalization do not have enough bands or processing power to apply correction in the bass frequency range. MultEQ uses a unique implementation of FIR filters that achieves very good resolution at frequencies below those that standard FIR filters can reach. The resolution of the MultEQ filters varies with frequency and this allocates more of the filter correction power where it is needed the most: in the lower frequencies.


On of the reasons Audyssey recommends all speakers including full range be crossed over at 80Hz is because their filter on the LFE channel is suppose to be much finer than the low frequency filter on the other channels.

Iíve your read any of my posts youíll know Iím not an Audyssey fanboy or even a fan for that matter. However, I can say with my current implementation of Audyssey on my Onkyo 3007 the bass from my EP500 is noticeably improved with Audyssey on in the one direct comparison Iíve made.
_________________________
3M80 2M22 6QS8 2M2 1EP500 Sony BDP-S590 Panny-7000 Onkyo-3007 Carada-134 Xbox Buttkicker AS-EQ1

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#295154 - 03/04/10 10:55 PM Re: Question about Audyssey [Re: grunt]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6789
Loc: The Peoples Republic of Il.

If I read Jeff's post correct Axiom dose not recommend it with their subs either.
_________________________
Rick


"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud


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#295155 - 03/04/10 10:56 PM Re: Question about Audyssey [Re: grunt]
Glitchy Offline
aficionado

Registered: 01/28/10
Posts: 578
Loc: Blueridge Foothills, NC
 Originally Posted By: grunt
From the Audyssey FAQ:

http://www.audyssey.com/technology/faq.html#overdriving

 Originally Posted By: Audyssey


Is there a danger of overdriving the loudspeakers by using MultEQ?

No, MultEQ filters are calculated by taking into account the capability of the loudspeaker and the overall gain structure of the system. Limits in correction are imposed at each frequency to prevent the loudspeakers from being overdriven.


So according to Audyssey at least it is not an issue. Also Iím not sure a sub like the EP500 would be in danger either because wouldnít itís own DSP chip prevent it from being overdriven or am I mistake about how that works.

 Originally Posted By: Audyssey

How well does MultEQ work at low frequencies?

This is one of the unique strengths of MultEQ. Room correction methods based on parametric equalization do not have enough bands or processing power to apply correction in the bass frequency range. MultEQ uses a unique implementation of FIR filters that achieves very good resolution at frequencies below those that standard FIR filters can reach. The resolution of the MultEQ filters varies with frequency and this allocates more of the filter correction power where it is needed the most: in the lower frequencies.


On of the reasons Audyssey recommends all speakers including full range be crossed over at 80Hz is because their filter on the LFE channel is suppose to be much finer than the low frequency filter on the other channels.

Iíve your read any of my posts youíll know Iím not an Audyssey fanboy or even a fan for that matter. However, I can say with my current implementation of Audyssey on my Onkyo 3007 the bass from my EP500 is noticeably improved with Audyssey on in the one direct comparison Iíve made.


During your setup did you do the 1/4 setup? And if so did you leave the volume there? Im so new to this I would leave it as it is, and not know something better is available.. the Axiom instructions said set the cross over at your highest freq, Audsyssey set some of mine at 90 so Im at the 150 setting on the EP500


Edited by wordgasm (03/04/10 11:01 PM)
_________________________
Fronts/Wides:M22s in/on
Center:VP150/VP100 in/on
Hghts,SS,SR:QS8s
Sub:EP500
AVR:Onkyo 3008

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#295156 - 03/04/10 11:06 PM Re: Question about Audyssey [Re: Glitchy]
Glitchy Offline
aficionado

Registered: 01/28/10
Posts: 578
Loc: Blueridge Foothills, NC
_________________________
Fronts/Wides:M22s in/on
Center:VP150/VP100 in/on
Hghts,SS,SR:QS8s
Sub:EP500
AVR:Onkyo 3008

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