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Discussion Starter #1
Hi guys,

Somewhat dazed and confused at the moment after battling with REW. More specifically this relates to "check levels".

All right I have gone down the path of wanting to 3 way active on a pair of Tympani 1D speakers.

Yes I know these were traditionally a 2 way speaker but the addition of a pair of Version 2 ribbons means I can now go 3 way.

I purchased an ECM Behnringer 8000 mic which seems to be a regular for this type of measurement use along with a Focusrite Scarlett Solo ( 2nd gen).

Okay I am testing 1 channel at a time so have gone for the first test the right hand side.

This means that I have gone RCA out R to RCA in on a minidsp.

The mic is connected XLR to XLR input on the focusrite.

I have tapped on the mic until it goes red or goes into clipping and determined what to set the gain or at least I think its set properly.

For the preferences I have left the driver as Java although there is the option of ASIO when setting preferences in REW. I have changed the speaker so its no longer
set at subwoofer.

I have also set the input and output devices as focusrite.

When I go to measurement I set the frequency range from 20 to 20,000.

I rang Behringer up to ensure there was no issue with the mic and we established there was nothing wrong as it would flash green when talking and I turned the gain all the way up it would go red.

I even used windows voice recorder and spoke in the mic and watched the meter go up and down.

I feel confident there are no issues with the mic.

The chap from Behringer suggested the real problem was signal was not getting routed back to REW properly.

When I check levels I get a consistent reading of -95dB and level too low.

If I actually disconnect the mic from the focusrite I get the same response.

Sound comes out of the speakers and is very audible. It goes up and down in line with changing the volume control on the preamp to the minidsp.

Not really sure what to do
 

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If you open the preferences window again, & look at it long enough ( especially the input selection ), you'll have one of those "doh" moments.

- Hint; the default state of REW's preferences leaves many single channel soundcards ( such as yours >> even though it's on the recommended list on the home-page ) disconnected at input.


:)
 

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Discussion Starter #3
If you open the preferences window again, & look at it long enough ( especially the input selection ), you'll have one of those "doh" moments.

- Hint; the default state of REW's preferences leaves many single channel soundcards ( such as yours >> even though it's on the recommended list on the home-page ) disconnected at input.


:)
Hi mate thanks for your response.

I am still a bit unsure so I have included photos of the relevant parts.

It shows the photo of the scarlett which I believe is 2 channel if I am not mistaken?

As you can see I have the 48v button pressed.

The gain is set about 12 oclock.

I am not sure if any further information is required.

Seem to be very much stuck here.
 

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If you plug your guitar into that Focusrite, & switch it's input type to "instrument", you'll get good guitar signal inputting into REW ( otherwise, the way you've currently configured REWs input select, means you'll get nada / just like you've already experienced ).

:)
 

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Discussion Starter #5
Hi mate,

Sorry but you have lost me.

At the moment I have as the photo suggests button clicked to line and NOT instrument since I am using the mic and NOT a guitar.

I have the monitor switched to off.

I've been onto this for the last couple of days and just cant seem to see the forest from the trees.

I tried using the ASIO driver instead of Java and got no sound out of the speakers.

With the current setup I have sound coming out of the speakers. The mic is definately picking up but its not routing properly to REW.

I think from what you say I need to go back into the REW preferences and see if I can make a change there.

Thats why I included the photo so everyone could visually see what I was doing as opposed to saying something which didnt reflect what was really happening.

Unfortunately right now not having that doh experience.

Thanks for responding. I appreciate it. I know I am doing something wrong but cant figure it out at the minute.
 

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Discussion Starter #6 (Edited)
Earl,

Here is a photo I just took of the available options for input device.

I have tried them all but to no avail.

If I choose the bottom option that is microphone the check level comes out to -45dB. Obviously still too low.
 

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Ozzie,
In REW Soundcard/preferences it shows 'right' as input channel for the REW input.
Channel 1 is the left channel and channel 2 is the right channel on the Solo.
The mic is plugged into channel 1 - the left input channel on the Solo.

Select the 'left' input channel in REW soundcard/preferences and see if that helps.
 

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Discussion Starter #8
Ozzie,
In REW Soundcard/preferences it shows 'right' as input channel for the REW input.
Channel 1 is the left channel and channel 2 is the right channel on the Solo.
The mic is plugged into channel 1 - the left input channel on the Solo.

Select the 'left' input channel in REW soundcard/preferences and see if that helps.
Hi mate just to be clear if you look at the included photo in Preferences there is Input Device and Output device.

I have set that to Focusrite for BOTH.

Underneath that there is Input and Output.

I have set BOTH to left.

Are you saying I should set just Input to left and and leave output to left as well?

I have done this and I now get NO sound coming out of my magnepan speakers and the level is once again too low although this time
it is approximately -65dB.

I am at a loss as to what to do. Could it be that the focusrite and behringer simply dont couple with the laptop I am using?

I have gone into the sound card settings on the laptop and set it to focusrite. I have basically run out of options.

Thanks for your help.
 

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I may be confused.
The image in post 3 shows the input channel to be 'right'.
The image in Post 6 does not show which channel is chosen as it is obscured by the dropdown above.
My post clearly indicates the input is to be set to channel 1 / 'Left".
My post did not mention the output as you were successfully getting output from your chosen output channel i.e. 'Right.
My thought was:
Input = Left
Output = right (as shown)

I you indeed have left chosen for input now (instead of the right channel as shown in post 3) then the problem must be elsewhere.
 

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Discussion Starter #10
I may be confused.
The image in post 3 shows the input channel to be 'right'.
The image in Post 6 does not show which channel is chosen as it is obscured by the dropdown above.
My post clearly indicates the input is to be set to channel 1 / 'Left".
My post did not mention the output as you were successfully getting output from your chosen output channel i.e. 'Right.
My thought was:
Input = Left
Output = right (as shown)

I you indeed have left chosen for input now (instead of the right channel as shown in post 3) then the problem must be elsewhere.
Hi mate,

Good pickup.

I have made some progress although still not there.

What I have now done is as you said. The input is set to LEFT and the output is set to RIGHT.

I have experimented with ASIO as the drive instead of Java and I now get the following result:

Level Okay -22db.

Now I know the sound getting outputted from the speaker is well over that so whilst the original problem of "level too low -95db" has
been improved dramatically to an ok status I know that the speakers is giving sound which should be picked up more than what is happening.

What do you think?

I have kept input and output devices as Focusrite USB audio.

The mic is a metre away from the speaker and horizontal to the ground.

Both horizontal and vertical positioning gives the same figure.

I am experimenting with gain on the Focusrite where its levelled to just before clipping( flashing red on the dial) and turned the volume up on the minidsp
without the HF noise coming through if its too loud.

Cheers and thanks for your help.
 

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ASIO is the better choice for that setup in my opinion, but Java will work just fine also. We should be sure to avoid any red flashing on the Solo input as that means the signal is being clipped. A setting of 12:00 O'clock on the Solo input gain as shown in Post 3 is okay. A setting between 12 and 3 O'clock is a good setting for the Solo. The reported headroom of -22 dB during a measurement is good also. It's pretty normal to take measurements with the measurement headroom reported somewhere between -28 to -18 dB.
If the REW SPL meter is calibrated per the REW Help instructions the REW charts will show the correct SPL level. If the REW SPL meter is not calibrated then the SPL level on the charts may be shifted higher or lower than actual, but the shape of the curve is still correct and the data is useful. Be careful if the REW SPL meter calibration has not been done - a low reading on the chart may occur when the actual level is much higher! That may be the current situation.
 

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Discussion Starter #12
ASIO is the better choice for that setup in my opinion, but Java will work just fine also. We should be sure to avoid any red flashing on the Solo input as that means the signal is being clipped. A setting of 12:00 O'clock on the Solo input gain as shown in Post 3 is okay. A setting between 12 and 3 O'clock is a good setting for the Solo. The reported headroom of -22 dB during a measurement is good also. It's pretty normal to take measurements with the measurement headroom reported somewhere between -28 to -18 dB.
If the REW SPL meter is calibrated per the REW Help instructions the REW charts will show the correct SPL level. If the REW SPL meter is not calibrated then the SPL level on the charts may be shifted higher or lower than actual, but the shape of the curve is still correct and the data is useful. Be careful if the REW SPL meter calibration has not been done - a low reading on the chart may occur when the actual level is much higher! That may be the current situation.
Hi mate,

Just so we are on the same page I have included the following photos for clarity.

The first photo refers to CHECK LEVEL. The reading comes up as -22dB as depicted.

Are you saying this is a headroom check. I was of the understanding when you check level that it would be 75dB as a result. Am I wrong here?

The second photo refers to START MEASURING which is the button next to check level.

In that photo it shows a Headroom figure of 10.5dB.

The photo after that is a graph that comes right after that figure.

Are these results okay in your opinion for me to now to do a SPL calibration?

Cheers and thankyou.
 

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Sorry Ozzie

I had to dash to work ( & therefore left you hanging / aren't forums just grand ? ) .

I was hoping the clues given within my first posts (to your input dilemma) would allow you to "puzzle-out the solution" ( & so give to you the satisfaction of arriving at your own "a-ha moment" ) .

Clearly John ( ie; jtalden ) saw you struggling & offered the solution on a platter ( which still managed to give you pause ).

FYI, REW is pretty complicated software, and its made more so by combining it's steep learning curve with first use of a soundcard ( that's not a recommended situation by me if at all avoidable ).

Ozzie said:
Are these results okay in your opinion for me to now to do a SPL calibration?
Yes your REW output & record levels are fine and you can move onto the next step of setting up REW's SPL Meter.


:)
 

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Discussion Starter #14
Sorry Ozzie

I had to dash to work ( & therefore left you hanging / aren't forums just grand ? ) .

I was hoping the clues given within my first posts (to your input dilemma) would allow you to "puzzle-out the solution" ( & so give to you the satisfaction of arriving at your own "a-ha moment" ) .

Clearly John ( ie; jtalden ) saw you struggling & offered the solution on a platter ( which still managed to give you pause ).

FYI, REW is pretty complicated software, and its made more so by combining it's steep learning curve with first use of a soundcard ( that's not a recommended situation by me if at all avoidable ).



Yes your REW output & record levels are fine and you can move onto the next step of setting up REW's SPL Meter.


:)
Thankyou.

I appreciate all the support one can get.
 
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