REW room measured, 6 Crossovers to choose from (6 graphes provided) - Home Theater Forum and Systems - HomeTheaterShack.com

 
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post #1 of 10 Old 06-25-13, 11:18 PM Thread Starter
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REW room measured, 6 Crossovers to choose from (6 graphes provided)

Onkyo 3008 with XT32 turned on.
I had previously calibrated with Mic before I played with the crossover point.
--------------------------------------------
Signal sent into AVR with only single left channel.
AVR mode 9.2 channel set into mono.
Two subwoofers all set to direct and managed by Audyssey, LFE 120Hz
--------------------------------------------
And below are frequency response of 9.2 channels driven.
Is it too much? or LCR+2SUB measurement is enough?
if you are to choose crossover which one will it be?
I limited the FR range from 20Hz-200Hz. Smoothing not applied.


Two front speakers full-band (Above)
All channels driven


Two front speakers crossovered at 40Hz Above)
All channels driven


Two front speakers crossovered at 50Hz Above)
All channels driven


Two front speakers crossovered at 60Hz Above)
All channels driven


Two front speakers crossovered at 70Hz Above)
All channels driven


Two front speakers crossovered at 80Hz Above)
All channels driven


Two front speakers crossovered at 90Hz Above)
All channels driven


Two front speakers crossovered at 100Hz Above)
All channels driven
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post #2 of 10 Old 06-25-13, 11:23 PM
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Re: REW room measured, 6 Crossovers to choose from (6 graphes provided)

There seems to be a bad interaction with your mains and sub at 74Hz or so. I think for this reason the higher crossover points look better. Can you reverse the phase setting on the subs and try again?


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post #3 of 10 Old 06-26-13, 12:53 AM
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Re: REW room measured, 6 Crossovers to choose from (6 graphes provided)

It appears that your subs and mains begin to integrate better at 70hz xover and above. I'm not sure what you are using for fronts, but the nature of the graphs suggests that they are quite capable at low frequencies. I would focus on the 70-80hz crossover point and dial it in from there by tweaking the subs distance setting. Adjust the setting one second at a time and measure, going up and down a few seconds from what Audyssey set. You may find that the 74 hz suckout starts to fill in just a bit. Good luck.
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post #4 of 10 Old 06-26-13, 01:23 AM
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Re: REW room measured, 6 Crossovers to choose from (6 graphes provided)

Have you done separate measurements for Left and Right (full range, and with different crossovers), + each sub post if you have.
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post #5 of 10 Old 06-27-13, 09:20 AM
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Re: REW room measured, 6 Crossovers to choose from (6 graphes provided)

Quote:
Two subwoofers all set to direct and managed by Audyssey, LFE 120Hz
about sums up what you are looking at; mains likely roll of rapidly below 60Hz.

Crossing 80Hz or higher with improve IM performance of mains.

Looks like Audyssey is working quite well.

Response of above 80Hz is dominated by room modes/standing waves.
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post #6 of 10 Old 06-27-13, 09:04 PM Thread Starter
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Re: REW room measured, 6 Crossovers to choose from (6 graphes provided)

If the purpose of the measurement is to find the proper subwoofer crossover which yield the smoothest FR for optimal bass in movie watching experience.

1-) Should I completely turn off Dynamic EQ, Audyssey XT32 and feed the AVR a mono signal to measure FR of all 9.2 channels playing at once? (and trying crossover of the front channels from full band to 120 Hz)

2-) I must complete Audyssey XT32 Calibration, turn on Dynamic EQ and then measure FR of all 9.2 channels playing at once? (and trying crossover of the front channels from full band to 120 Hz)

or

3-) I just have to measure only FR the interaction between two front speakers and two subwoofers?
I do measure FR of all 9.2 channels driven, and another one is FR of 2 front speakers and 2 subwoofers

4-) or any measurement without Audyssey XT32 turned on (and speakers delayed compensated) will be wrong?

--------------------------------------------------------------------------



Picture Above
XT32 on, Dynamic EQ on, All 9.2 channels driven from 20-20,000Hz
Front channels : full band
Center Channel : 70Hz




Picture Above
XT32 on, Dynamic EQ on, All 9.2 channels driven from 20-20,000Hz
Front channels : 40-Hz
Center Channel : 70Hz


Picture Above
XT32 on, Dynamic EQ on, All 9.2 channels driven from 20-20,000Hz
Front channels : 50-Hz
Center Channel : 70Hz


Picture Above
XT32 on, Dynamic EQ on, All 9.2 channels driven from 20-20,000Hz
Front channels : 60-Hz
Center Channel : 70Hz


Picture Above
XT32 on, Dynamic EQ on, All 9.2 channels driven from 20-20,000Hz
Front channels : 70-Hz
Center Channel : 70Hz


Picture Above
XT32 on, Dynamic EQ on, All 9.2 channels driven from 20-20,000Hz
Front channels : 80-Hz
Center Channel : 70Hz


Picture Above
XT32 on, Dynamic EQ on, All 9.2 channels driven from 20-20,000Hz
Front channels : 90-Hz
Center Channel : 70Hz


Picture Above
XT32 on, Dynamic EQ on, All 9.2 channels driven from 20-20,000Hz
Front channels : 100-Hz
Center Channel : 70Hz


Picture Above
XT32 on, Dynamic EQ on, All 9.2 channels driven from 20-20,000Hz
Front channels : 120-Hz
Center Channel : 70Hz

--------------------------------------------

Picture Above
XT32 off, Dynamic off, Two front speakers and two subwoofers driven from 20-20,000Hz
Front channels : Full Band


Picture Above
XT32 off, Dynamic off, Two front speakers and two subwoofers driven from 20-20,000Hz
Front channels : crossovered at 40-Hz


Picture Above
XT32 off, Dynamic off, Two front speakers and two subwoofers driven from 20-20,000Hz
Front channels : crossovered at 50-Hz


Picture Above
XT32 off, Dynamic off, Two front speakers and two subwoofers driven from 20-20,000Hz
Front channels : crossovered at 60-Hz


Picture Above
XT32 off, Dynamic off, Two front speakers and two subwoofers driven from 20-20,000Hz
Front channels : crossovered at 70-Hz


Picture Above
XT32 off, Dynamic off, Two front speakers and two subwoofers driven from 20-20,000Hz
Front channels : crossovered at 80-Hz


Picture Above
XT32 off, Dynamic off, Two front speakers and two subwoofers driven from 20-20,000Hz
Front channels : crossovered at 90-Hz


Picture Above
XT32 off, Dynamic off, Two front speakers and two subwoofers driven from 20-20,000Hz
Front channels : crossovered at 100-Hz


Picture Above
XT32 off, Dynamic off, Two front speakers and two subwoofers driven from 20-20,000Hz
Front channels : crossovered at 120-Hz
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post #7 of 10 Old 06-28-13, 02:19 AM
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Re: REW room measured, 6 Crossovers to choose from (6 graphes provided)

I would stick with #1. Turn off all enhancements. Integrate your sub with your mains as these have the greatest impact on bass performance for your system, especially for music. Play with your crossover settings first, then tweak with the sub distance setting for final smoothing. Like it was mentioned earlier, Audyssey seems to have done quite well in your case.

Once the fr looks good, turn Dynamic EQ on and measure to see the effect. I actually measured at the different volume levels I typically listen at to see what Dynamic EQ was doing, keeping in mind "perceived loudness" effects.

From a practical standpoint, I wouldn't spend much time measuring total system response (all 9 speakers). Unless you plan on listening to everything in All Channel Stereo you shouldn't be too concerned with the response of all 9(?) speakers playing at the same time.
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post #8 of 10 Old 06-28-13, 10:27 AM
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Re: REW room measured, 6 Crossovers to choose from (6 graphes provided)

Quote:
mc_lover wrote: View Post

Picture Above
XT32 off, Dynamic off, Two front speakers and two subwoofers driven from 20-20,000Hz
Front channels : crossovered at 90-Hz
I agree. First, make sure your subs and mains are integrated properly. Do this by turning off Audyssey (or being lazy and measuring in Pure Direct) and finding the optimal phase and crossover points for the mains and sub. Your 2.1/2.2 part of the system is the most important IMO. Then once that is as good as you can get the old fashioned way, let Audyssey loose on the whole 9.2 system and see what improves. From the looks of your last batch of plots, I think the mains crossed at 90Hz is a good bet.


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post #9 of 10 Old 06-28-13, 09:26 PM Thread Starter
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Re: REW room measured, 6 Crossovers to choose from (6 graphes provided)

I'll try to measure it tonight.
From what I saw in Onkyo loudspeaker.
If I am to measure the LCR+Subs. it must be in Prologic II mode.

Will see the result asap.
Thank you for all valuable comments.
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post #10 of 10 Old 06-30-13, 08:15 PM
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Re: REW room measured, 6 Crossovers to choose from (6 graphes provided)

i thought 80hz was it.

does anybody know if audyssey has a limit on the number of bands it can use for correction?
for example.. when REW does the generic equalizer filters, it always stops at 20 bands of correction.

if audyssey doesn't have unlimited filters... then it is wise to get the frequency response as flat as it can go before running the system.. that way you are making more corrections in other places.


the question is..
does the flattest frequency response also come with the flattest phase response?

flat frequency versus flat phase sounds like a topic worth reading about on these forums.


since subwoofers fill a room with its output.. it might be worth noting it's phase response & if you can get it to hover around zero.

it's like traveling a maze over here, all dead ends noted before getting out... and how it sounds with an attempt to flatten the phase would be the A or B choice for me.
(one an all effort for phase .. the other an all effort for flat frequency response)
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