Simplified REW Setup and Use (USB Mic & HDMI Connection) Including Measurement Techniques and How To Interpret Graphs - Page 641 - AVS Forum | Home Theater Discussions And Reviews
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post #19201 of 19218 Old Today, 12:15 PM
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Quote:
Originally Posted by jkasanic View Post
Been trying to follow along so perhaps I missed something but that C measurement appears as though a XO is engaged around 60Hz. Just wanted to confirm that when taking the C only (no sub), he's changing the speaker to large or at least lowering the XO to the lowest possible value?
measuring the high passed C is, in this case, a useful bit of info
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post #19202 of 19218 Old Today, 12:24 PM
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Just ran my first measurement with Center + Sub. Here it is. Not sure why its so much higher at the beginning. I did change crossover from 80hz to 100hz and one of the early frequency dips came up a bit but not too much change.

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FS: Proficient GL6 Center Channel Speaker
==============================

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==============================
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post #19203 of 19218 Old Today, 12:48 PM
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Quote:
Originally Posted by 3ll3d00d View Post
measuring the high passed C is, in this case, a useful bit of info
Don't disagree but I thought OP (indus1) was also trying to evaluate best XO?

Last edited by jkasanic; Today at 12:51 PM.
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post #19204 of 19218 Old Today, 01:05 PM
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Quote:
Originally Posted by jkasanic View Post
Don't disagree but I thought OP (indus1) was also trying to evaluate best XO?
he's not at that point yet albeit the data says he needs to deal with it
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post #19205 of 19218 Old Today, 01:10 PM
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Quote:
Originally Posted by citsur86 View Post
Just ran my first measurement with Center + Sub. Here it is. Not sure why its so much higher at the beginning. I did change crossover from 80hz to 100hz and one of the early frequency dips came up a bit but not too much change.

That ~32Hz peak needs to be brought down either via placement or EQ or both. That is the bass managed portion of the cc+sub measurement and will show up in the LFE channel too. It might also be related to the blown fuse yesterday with the intro of EOT.
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post #19206 of 19218 Old Today, 01:13 PM
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That peak is also masking everything under it, which makes the ULF basically non-existent...

I wouldn't bother playing with crossovers until the sub frequency response/placement is optimized.

Is this measurement with EQ (MCACC) on?

Try measuring LFE channel next.

Last edited by PlasmaPZ80U; Today at 01:18 PM.
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post #19207 of 19218 Old Today, 01:21 PM
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Quote:
Originally Posted by PlasmaPZ80U View Post
That peak is also masking everything under it, which makes the ULF basically non-existent...

I wouldn't bother playing with crossovers until the sub frequency response/placement is optimized.

Is this measurement with EQ (MCACC) on?

Try measuring LFE channel next.
Yeah this is with EQ on. I turned it off and there was not a lot of change in that peak from 25-35hz. I do notice there is a rattle down low when running MCACC that didn't used to be there. This time I'm 100% sure it is coming from inside the sub, as opposed to before where it was coming from rattling picture frames. I recorded the sound its making here. This is durning MCACC Analyze.

https://1drv.ms/u/s!AqCwvEUzj5tPn2m17LA7IQ2uoYNE

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post #19208 of 19218 Old Today, 01:38 PM
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Quote:
Originally Posted by indus1 View Post
I've attached an image to show what I mean. I've had to take a photo as snippet wouldn't let me click to show the drop down menu.


Thanks
Getting a screen capture that shows the contents of a drop-down menu is tricky, because the minute you launch the Snipping Tool, the drop-down closes. However, here is a procedure that works:

1. Open the drop-down.
2. Press the "Print Scrn" key (assuming a Windows PC). This captures the current screen state, including the open drop-down.
3. Open MSPAINT and click Shift-Insert, which copies the current screen state into the app.
4. While the image of the screen, including the open drop-down, is displayed, use the Snipping Tool to capture the image of the open drop-down.
5. Save the Snipping Tool capture.
6. Add it to your post.

Easy-peasy.
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post #19209 of 19218 Old Today, 01:42 PM
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Quote:
Originally Posted by citsur86 View Post
Just ran my first measurement with Center + Sub. Here it is. Not sure why its so much higher at the beginning. I did change crossover from 80hz to 100hz and one of the early frequency dips came up a bit but not too much change.
Not looking too bad except for that giant mountain of a peak at 30hz.

Can we see the graph scaled from 15-300hz only, no smoothing?
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post #19210 of 19218 Old Today, 01:43 PM
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Quote:
Originally Posted by citsur86 View Post
Quote:
Originally Posted by PlasmaPZ80U View Post
That peak is also masking everything under it, which makes the ULF basically non-existent...

I wouldn't bother playing with crossovers until the sub frequency response/placement is optimized.

Is this measurement with EQ (MCACC) on?

Try measuring LFE channel next.
Yeah this is with EQ on. I turned it off and there was not a lot of change in that peak from 25-35hz. I do notice there is a rattle down low when running MCACC that didn't used to be there. This time I'm 100% sure it is coming from inside the sub, as opposed to before where it was coming from rattling picture frames. I recorded the sound its making here. This is durning MCACC Analyze.

https://1drv.ms/u/s!AqCwvEUzj5tPn2m17LA7IQ2uoYNE
I would contact Rythmik and you might have to take a close look at the driver in case it was damaged yesterday.

I don't think that peak is a result of any potential driver damage, though. Likely a modal peak caused by room acoustics. I have 2 big ones before sub EQ via MiniDSP 2x4 on mine.

In any case, I don't think MCACC is doing much for the sub. Try measuring LFE (ch 4) and check the distortion tab to see if gives you insight on the driver/rattling sound inside sub.
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post #19211 of 19218 Old Today, 02:04 PM
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Hmm looks like somehow it got worse since I did it last..

Here is what you guys asked for - i think.



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==============================
FS: Proficient GL6 Center Channel Speaker
==============================

My Current "Living Room" Home Theater!
==============================
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post #19212 of 19218 Old Today, 02:10 PM
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Quote:
Originally Posted by citsur86 View Post
Hmm looks like somehow it got worse since I did it last..

Here is what you guys asked for - i think.



It might not be worse, just different scaling and unsmoothed.
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post #19213 of 19218 Old Today, 02:17 PM
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It does appear that CC+sub can be improved at crossover region via sub distance tweak.

However, I would sort out any sub issues first, including the peak and the rattling.
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post #19214 of 19218 Old Today, 02:22 PM
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Quote:
Originally Posted by indus1 View Post
I've attached an image to show what I mean. I've had to take a photo as snippet wouldn't let me click to show the drop down menu.


Thanks

Could somebody please confirm that I have selected the correct timing reference option?

I've asked a few times over the last few days but nobody has commented. I just want to make sure that I haven't made a basic error in the REW set up.

Thanks
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post #19215 of 19218 Old Today, 02:24 PM
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Quote:
Originally Posted by indus1 View Post
Could somebody please confirm that I have selected the correct timing reference option?

I've asked a few times over the last few days but nobody has commented. I just want to make sure that I haven't made a basic error in the REW set up.

Thanks
Only you can verify this.

if you want to measure with a timing reference then the signal needs to go to an actual channel that contains a tweeter. If it isn't doing this then it won't have a valid timing reference. I am still not a computer with REW so what does the IR look like for your C measurement?
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post #19216 of 19218 Old Today, 02:31 PM
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Quote:
Originally Posted by PlasmaPZ80U View Post
It does appear that CC+sub can be improved at crossover region via sub distance tweak.

However, I would sort out any sub issues first, including the peak and the rattling.
Agreed Plasma.

If he can tame that 30hz peak (Audyssey would do it, or a MiniDSP) and with the sub distance tweak that response would be very respectable IMO.

There is another slight issue around 60hz, but it's quite narrow so is probably inaudible during actual content.


BTW Plasma, I just wanted to tell you that I'm proud of how far you've come since you first came to the subwoofer section of the forum. I see you contribute a lot now, and from what I have seen, it has all been very good advice!
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post #19217 of 19218 Old Today, 02:34 PM
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Quote:
Originally Posted by 3ll3d00d View Post
Only you can verify this.

if you want to measure with a timing reference then the signal needs to go to an actual channel that contains a tweeter. If it isn't doing this then it won't have a valid timing reference. I am still not a computer with REW so what does the IR look like for your C measurement?

Hi

Its not a matter of wanting to use a timing reference, as far as I can gather you HAVE to choose a timing reference under 'preferences. The default is HD audio 1 but I'm not quite sure what this refers to.

Anybody using hdmi measurements must be having the same options.

Perhaps its irrelevant what one chooses under this heading but I need to confirm that I'm on making an error in this part of the set up.

So I need to try and find out what I should choose from the timing references options when measuring ch3 or ch4.

Thanks
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post #19218 of 19218 Old Today, 02:36 PM
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Quote:
Originally Posted by indus1 View Post
Hi

Its not a matter of wanting to use a timing reference, as far as I can gather you HAVE to choose a timing reference under 'preferences. The default is HD audio 1 but I'm not quite sure what this refers to.

Anybody using hdmi measurements must be having the same options.

Perhaps its irrelevant what one chooses under this heading but I need to confirm that I'm on making an error in this part of the set up.

So I need to try and find out what I should choose from the timing references options when measuring ch3 or ch4.

Thanks
you don't have to choose one, go to preferences/analysis and you can see the options for whether you need a timing reference or not (the one where you don't is something like "set impulse at T=0")
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