"Official" Audyssey thread (FAQ in post #1) - Page 799

Originally Posted by jmcomp124

Eyeballing your AS-EQ1 chart, I see the lowest dip at 40Hz being 76dB and at 60Hz 88dB and that is 12dB variation. The pro seemed to do better at about +-6dB. Doesn't the AS-EQ1 and the Pro have the same 256x filters in that frequency range?

Originally Posted by goonstopher

Your eyeball is different than mine.

It clearly looks like 67-68dB and 75dB to me

Originally Posted by jmcomp124

Which chart are you balling? I am looking at the red waterfall.

Originally Posted by pepar

Waterfalls are good for decay time analysis, but I switched to posting FR graphs with 1/3 octave smoothing to look at response.

Originally Posted by goonstopher

Pepar,

I was not talking about what you said, just the other post talked about the 40hz range and the 80hz range and he was off by a lot.

Originally Posted by jmcomp124

I was looking at the red waterfall chart for the AS-EQ1. Is that the same thing you were looking at when you concluded "he was off".

Originally Posted by jmcomp124

Which chart are you balling? I am looking at the red waterfall.

Originally Posted by goonstopher

I'm wrong a lot. I am use to it

Originally Posted by jmcomp124

No problem. My concern is that there maybe something wrong with the measurement methodology and I don't want Pepar to come to wrong conclusions. We were looking at different things.
Pepar, if you get a chance can you use the FL or FR instead of the C. I don't know what is going on with the center channel. I know you are looking at the entire FR for room treatment, but it would be good to validate a smaller data set like the sub 200Hz range. So if you redo it, unplug the FL and FR, Xover them at 200Hz so the high resolution filters take effect more. Then before you generate the waterfall, look at the FR. 1/3 smoothening is fine, but do compare the unsmoothed ones too. If you basic test is off, then everything will be off. So validate that the basic setup is accurate and then go from there. Good luck.

Originally Posted by jmcomp124

This never bothered me before but came across my mind recently. When Audyssey is done calibration, the internal test tones are supposed to be 75dBC for all channels at primary LP. I have a galaxy CM-140 mic. It has new batteries and measurements look consistent on REW, but for test tones it reads only 70dBC. Is my CM-140 off by 5dBC?

Originally Posted by jmcomp124

Hi Bluesky,
Here is an excerpt from my DHC 40.1 manual. There is a RE-EQ for modes other than THX.
Thanks,
-Jai


Re-EQ Function
With the Re-EQ function, you can compensate a soundtrack whose high-frequency content is too harsh, making it
more suitable for home theater viewing.
Re-EQ Off: Re-EQ Function off (default).
On: Re-EQ Function on.
This function can be used with the following listening modes: Dolby Digital, Dolby Digital Plus,
Dolby TrueHD, Multichannel, DTS, DTS-HD High Resolution Audio, DTS-HD Master Audio, DTS Express,
DSD, Dolby EX, Dolby Pro Logic IIz Height, Dolby PLIIx Movie, Neo:6 Cinema, and 5.1-channel source +
Neo:6.
Re-EQ(THX) Off: Re-EQ (THX) Function off.
On: Re-EQ (THX) Function on (default).
This function can be used with the following listening modes: THX Cinema, THX Surround EX, and
THX Ultra2 Cinema.
Note:
Settings for the Re-EQ function are kept in each listening mode. However, in THX listening mode, when the
AV controller is turned off, it will return to On.

Originally Posted by jmcomp124

My analog meter is about 8 years old. I hope Chris will chime in. I don't think it is a meter accuracy issue. Does the distance of the primary listening position from the front stage have any effect on this?
The internal tones must have a reference based on which they are calibrated.

Originally Posted by Mupi

Hi
My question is mainly regarding the Integra DHC 40.1 but I didnt get an answer when I posted it on the 40.1 thread. So I am asking here.

I like to know if I can use Audyssey Flat (no high freq. roll off) for 2ch music.

I dont see the "stereo" option listed for Re-EQ in the manual.

The manusl does say that when any THX option is selected
Audyssey Flat is used.

I see a THX-Music option so that will let me listen without the high
freq roll off. Now my concern is if my source is a CD player, will the
THX-Music play just 2ch music or do some surround music.

I have already placed an order for 40.1 and waiting. If I cant listen to
2ch music without the high freq. roll off then I would not even bother to
open it. I would just sell it even if I have to take a hit. I cant return it even if I dont open it as the dealer I got this is not a very friendly person to deal with.

I would appreciate any feedback regarding using Audyssey Flat for 2ch music

Thanks

Originally Posted by goonstopher

I'm wrong a lot. I am use to it

Originally Posted by bluesky636

A THX (and all other?) receiver's test tones are -35 dBFS. The trims are adjusted to read 75 dB SPL at the listening position. Just like Audyssey. My internal AVR test tones read 75 dB +/-1 dB as measured by my Rat Shack meter after Audyssey calibration with no other adjustment.

Originally Posted by pepar

I posted waterfalls to show the reduction of ringing.

Originally Posted by embit

I just started playing around with my radio shack spl and I've noticed the same thing as jmcomp, all of the internal test tones were playing back at 70dB. For some reason my center channel was even lower, more like 68dB.

This is on an onkyo 707, just after a calibration run. Is there any harm in adjusting these levels to get to 75dB? I just want to know that when I'm at 0 on the knob I'm getting the reference levels I'm supposed to be.

Originally Posted by embit

I just started playing around with my radio shack spl and I've noticed the same thing as jmcomp, all of the internal test tones were playing back at 70dB. For some reason my center channel was even lower, more like 68dB.

This is on an onkyo 707, just after a calibration run. Is there any harm in adjusting these levels to get to 75dB? I just want to know that when I'm at 0 on the knob I'm getting the reference levels I'm supposed to be.

Originally Posted by audyssey

Mic calibration consists of two elements: (1) frequency response correction and (2) sensitivity adjustment. Neither of these are possible in the mic itself. The response correction must happen in the electronics or the software and the sensitivity adjustment must happen in the preamp. To do that requires a calibrator that is placed over the mic. So, yes, out of the box pretty much every mic is uncalibrated unless it is combined with specific software correction.

Originally Posted by jmcomp124

Chris,
So does that mean that both my CM-140 and the Rshack meter are off by 5dB?
Thanks,
-Jai

Originally Posted by audyssey

I have no way of knowing without measuring them with a calibrator.

Originally Posted by jmcomp124

Chris,
According to design, after Audyssey calibration; the SPL (if measured accurately with a calibrated mic/spl meter) should be 75dBC at listenining position. Is that right?
Thanks,
-Jai

Originally Posted by bluesky636

This has been discussed before, but a quick overview is as follows:

Onkyo and Integra THX AVRs behave the same. Anytime a THX mode is selected, they default to Audyssey flat. Selecting THX Music will use Audyssey flat and Re-EQ is turned off. I use DPL IIX THX Music for all two channel music (I do not have a multichannel music source). This gives me 2-channels in and 7.1 channels out with Audyssey Flat and no Re-EQ. I do not know if there is a listening mode that allows you to apply THX music to straight 2-channel stereo. I have never looked. Hope that answers your question.

Originally Posted by noah katz

Where do you see it as reduced?

In general the decay times look the same to me, in particular in the 20-30 Hz range where it runs off all three of the graphs.

Originally Posted by Mupi

My concern is whether selecting THX Music would just give me 2ch out or force me to listen to 2ch music in 7.1 mode, which would be ridiculous.

I am looking for a listening mode where I can listen to 2ch music with Audyssey Flat in 2ch only or may be 2.1 but no matrixing 2ch to 7.1 out.

Originally Posted by pepar

I see it reduced a lot under 22Hz between no correction and the AS-EQ1.

Originally Posted by pepar

It's called the Audyssey Pro Kit and it allows you to create, save and load customized target curves.

Originally Posted by noah katz

looks to me like that's just because the level is lower.

Really, looking at the graphs, i just don't see the csd being improved.

Which isn't to say it doesn't sound better, i just don't think the graphs as explaining why.