Simplified REW Setup and Use (USB Mic & HDMI Connection) Including Measurement Techniques and How To Interpret Graphs - Page 407 - AVS Forum
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post #12181 of 12191 Old Yesterday, 03:22 PM
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Originally Posted by artur9 View Post
It depends on what you're trying to achieve. I believe the consensus on this thread is to measure and tweak subs etc with it off. That way Audyssey has a good starting point to work with.

On the other hand, if you just want feedback from the thread participants with it on then that's fine as well.

Just remember to read AustinJerry's guide before doing anything.
Okay that makes sense. Thanks artur9!
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post #12182 of 12191 Old Yesterday, 04:24 PM
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If you turn off Audyssey, it should turn off Dyn EQ & Vol as well. There are some AVRs that allow you to use Dyn EQ & Vol without Audyssey, and yours may be one.

BTW, you should never use Dyn Vol for any critical music listening or movies (unless it's late at night and your trying not to wake the wife/kids).
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post #12183 of 12191 Old Yesterday, 06:05 PM
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Originally Posted by AustinJerry View Post
On the preferences screen, go to the "Timing Reference Output" box on the right, and if HDMI Out 1 is configured as the normal output, select HDMI Out 2 in the timing reference drop-down. This will output a signal to both the left and the right channels simultaneously. Then, when you are in PLII Cinema mode, since the left and right channels have the same signal, they will be combined and output to the center channel, allowing you to take a measurement of that channel.
Thank you very much Jerry.
I will try that out tonight. I also have few more related questions.

1. I believe when "Use subwoofer to check/set levels" is elected in preferences, it will later do sub only measurement.
2. When I do just Left or Right front speaker, should I set those speakers to Full band in the AVR (or leave them at 80 Hz crossover)?
3. When I do Left (or Right or Center) + Sub, what should I select in preferences (Use subwoofer or use Main speaker) to check/set levels ? At this time should I set the Fronts or Center to 80 Hz?

Thanks again for your help and time..
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post #12184 of 12191 Old Today, 12:47 AM
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Quote:
Originally Posted by aaranddeeman View Post
Thank you very much Jerry.
I will try that out tonight. I also have few more related questions.

1. I believe when "Use subwoofer to check/set levels" is elected in preferences, it will later do sub only measurement.
2. When I do just Left or Right front speaker, should I set those speakers to Full band in the AVR (or leave them at 80 Hz crossover)?
3. When I do Left (or Right or Center) + Sub, what should I select in preferences (Use subwoofer or use Main speaker) to check/set levels ? At this time should I set the Fronts or Center to 80 Hz?

Thanks again for your help and time..
The "use xxx to set levels" option just determines what bandwidth of pink noise is used for the signal, IIRC it is 500-2000Hz for the mains and 30-80Hz for the sub. It doesn't change your actual measurements at all. The level check itself is just to help confirm you have input levels set correctly so you don't need to repeat it.

You would set them to large if you want to see their full range response, for example if you are trying to work out which crossover frequency to use.
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post #12185 of 12191 Old Today, 06:29 AM
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Quote:
Originally Posted by 3ll3d00d View Post
The "use xxx to set levels" option just determines what bandwidth of pink noise is used for the signal, IIRC it is 500-2000Hz for the mains and 30-80Hz for the sub. It doesn't change your actual measurements at all. The level check itself is just to help confirm you have input levels set correctly so you don't need to repeat it.

You would set them to large if you want to see their full range response, for example if you are trying to work out which crossover frequency to use.
Thanks.
I still am bit confused about measuring sub only or mixing it with L,R and C.
In other words, What all I need to do to send the signal to sub woofer only using HDMI (when your HDMI supports only 2 channel audio)
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post #12186 of 12191 Old Today, 06:52 AM
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Quote:
Originally Posted by aaranddeeman View Post
Thanks.
I still am bit confused about measuring sub only or mixing it with L,R and C.
In other words, What all I need to do to send the signal to sub woofer only using HDMI (when your HDMI supports only 2 channel audio)
you can either raise the crossover as high as possible and use the L or R channel (with the L or R set to small) or, if you use a separate power amp, you can change preout connections
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post #12187 of 12191 Unread Today, 08:13 AM
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Quote:
Originally Posted by aaranddeeman View Post
Thanks.
I still am bit confused about measuring sub only or mixing it with L,R and C.
In other words, What all I need to do to send the signal to sub woofer only using HDMI (when your HDMI supports only 2 channel audio)
If I could augment d00d's feedback a bit. When you are doing your measurements, there are several objectives.

Objective 1-Use REW to assess the performance of the subs by themselves, which includes moving the subs around to find the best placement. To configure REW for this objective, you need to turn off the main speakers (either by carefully disconnecting their cables, or by turning off your separate power amp, if you use one). Feed the AVR with a signal on both the left and right channels (HDMI 1and 2), and set the AVR to stereo mode. Run sweeps 15-300Hz, and present the results without any smoothing.

Objective 2-Assess overall bass performance, which will include the contributions of the left and right speakers, as well as the center. For these measurements, turn the left and right speakers back on, set the crossover to the normal value (say 80Hz), and take four measurements:

- With the AVR in stereo mode, feed the left channel (HDMI 1 in REW) and measure 15-300Hz. Present the results with no smoothing.

- Repeat for the right channel (HDMI 2 in REW).

- Feed the left and right channels simultaneously, and repeat the measurement a third time (measuring left and right channels)

- And finally, keeping both channels active in REW, change the AVR to PLII Cinema, which allows you to measure the center channel.

These four measurements will give you good insight into how the bass region is performing in your room with your equipment.

You can also run full sweeps 15-20,000 Hz for the left, right and center channel to see how the whole spectrum is being reproduced. These measurements should have smoothing applied (anywhere from 1/24 to 1/6, depending on who you talk to).
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post #12188 of 12191 Unread Today, 08:36 AM
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In addition to what Jerry wrote above, if you're interested in checking how the XO recommended by the AVR looks in your room then you would want to measure the L, C and R separately as full band (large) with the sub turned off and overlay these measurements with the sub(s) response taken with the XO set as high as possible and the LCR either disconnected or separate amps turned off.
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post #12189 of 12191 Unread Today, 09:27 AM
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Quote:
Originally Posted by AustinJerry View Post
If I could augment d00d's feedback a bit. When you are doing your measurements, there are several objectives.

Objective 1-Use REW to assess the performance of the subs by themselves, which includes moving the subs around to find the best placement. To configure REW for this objective, you need to turn off the main speakers (either by carefully disconnecting their cables, or by turning off your separate power amp, if you use one). Feed the AVR with a signal on both the left and right channels (HDMI 1and 2), and set the AVR to stereo mode. Run sweeps 15-300Hz, and present the results without any smoothing.

Objective 2-Assess overall bass performance, which will include the contributions of the left and right speakers, as well as the center. For these measurements, turn the left and right speakers back on, set the crossover to the normal value (say 80Hz), and take four measurements:

- With the AVR in stereo mode, feed the left channel (HDMI 1 in REW) and measure 15-300Hz. Present the results with no smoothing.

- Repeat for the right channel (HDMI 2 in REW).

- Feed the left and right channels simultaneously, and repeat the measurement a third time (measuring left and right channels)

- And finally, keeping both channels active in REW, change the AVR to PLII Cinema, which allows you to measure the center channel.

These four measurements will give you good insight into how the bass region is performing in your room with your equipment.

You can also run full sweeps 15-20,000 Hz for the left, right and center channel to see how the whole spectrum is being reproduced. These measurements should have smoothing applied (anywhere from 1/24 to 1/6, depending on who you talk to).
Thank you so very much Jerry.
This is the precise information I was looking for.
Looks like I have enough work during this weekend..
Once I get the feel of it, I guess I should plan to invest in the USB mic.
Right now I am using RS-SPL in place of mic.
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post #12190 of 12191 Unread Today, 09:29 AM
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Quote:
Originally Posted by jkasanic View Post
In addition to what Jerry wrote above, if you're interested in checking how the XO recommended by the AVR looks in your room then you would want to measure the L, C and R separately as full band (large) with the sub turned off and overlay these measurements with the sub(s) response taken with the XO set as high as possible and the LCR either disconnected or separate amps turned off.
Thanks.
This is really a valuable TIP.
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post #12191 of 12191 Unread Today, 09:33 AM
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Quote:
Originally Posted by aaranddeeman View Post
Thank you so very much Jerry.
This is the precise information I was looking for.
Looks like I have enough work during this weekend..
Once I get the feel of it, I guess I should plan to invest in the USB mic.
Right now I am using RS-SPL in place of mic.
Yes, get a USB mic for sure. Do you have the correct calibration file for the RS SPL meter??
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