EQ Wizard-Ethan

[skiroy]

Hey Ethan,
I know this seems to be a subject you are familar with so Im going to try and ask you.I have a Behringer measurement mic and EQ Wizard.

1.Do I still need to calibrate in the section that says "SPL Meter"?

2.Do When I calibrate or do the level check, the default is car subwoofer?Should that be set to full range speaker or in the case of calibration,"REW speaker cal signal"?

3.Do I have to do level check everytime I move the mic to a different location?

4.Where in the room should be checked?Just in front of the monitors?In each corner?What about the corner where my sub is placed?Wouldnt that read an excessive amount of low end because the sub is there?In the middle of the room?

5. When I take the measurement, a window comes up where I can adjust the start Freq,End Freq,Length,# of sweeps. What should the end Freq be?The default is 200 hz,but that doesnt test the high freq range.What do you set these parameters as?

6.What signal type should be used?Pink Noise,white PN,Sine wave?Would you use one for reflection points and a different one for bass response or is there no such test for reflection points?

7. Finally, when my measurement signal is low, sould I increase my monitor's volume or increase my measurement mic's pre-amp gain?How do I know what volume level to have my monitors at for the whole room?

I know this is a lot of questions but I appreciate your responses tremendously.

Thankx

[Ethan Winer]

Originally Posted by skiroy

Do I still need to calibrate in the section that says "SPL Meter"?

No, that's needed only for absolute SPL measurements. Room testing cares only about the relative difference at various frequencies.

Should that be set to full range speaker or in the case of calibration,"REW speaker cal signal"?

I think so.

Do I have to do level check everytime I move the mic to a different location?

No, but watch the reported levels and make sure it never gets too low or clips.

Where in the room should be checked?

What really matters is at the listening position.

When I take the measurement, a window comes up where I can adjust the start Freq,End Freq,Length,# of sweeps.

One sweep from 20 Hz to 20 KHz ought to do fine. For low frequencies you only need up to 300 Hz or so.

What signal type should be used?

REW provides its own sweep tone. That's what you use.

Finally, when my measurement signal is low, sould I increase my monitor's volume or increase my measurement mic's pre-amp gain?

I doubt it matters as long as you're using normal gain-staging.

How do I know what volume level to have my monitors at for the whole room?

The sweep should be reasonably loud, but not so loud it hurts your ears or risks harming your speakers. If it's not loud enough you won't see the true extent of nulls because they could be below the acoustic noise floor of your room.

I know this is a lot of questions but I appreciate your responses tremendously.

No problem, I already mailed you my bill.

And thanks for moving this to the public forum.

--Ethan

[skiroy]

Originally Posted by Ethan Winer

No, that's needed only for absolute SPL measurements. Room testing cares only about the relative difference at various frequencies.



I think so.



No, but watch the reported levels and make sure it never gets too low or clips.



What really matters is at the listening position.



One sweep from 20 Hz to 20 KHz ought to do fine. For low frequencies you only need up to 300 Hz or so.



REW provides its own sweep tone. That's what you use.



I doubt it matters as long as you're using normal gain-staging.



The sweep should be reasonably loud, but not so loud it hurts your ears or risks harming your speakers. If it's not loud enough you won't see the true extent of nulls because they could be below the acoustic noise floor of your room.



No problem, I already mailed you my bill.

And thanks for moving this to the public forum.

--Ethan

Thankx Ethan.You and this site are priceless!!

[skiroy]

Where in the room should be checked?
What really matters is at the listening position.

Do this go for bass response as well?


Also, far as reflection go, do you also look at the data in the listening position in order to determine if comb filtering and other problems, related to the need for absorption panels at reflection points,are present?

Could you place the measurment mic at suspected reflection points to determine if it is an reflection point?

[Ethan Winer]

Originally Posted by skiroy

Do this go for bass response as well?

Especially for bass response.

Also, far as reflection go, do you also look at the data in the listening position in order to determine if comb filtering and other problems, related to the need for absorption panels at reflection points,are present?

Yes, listening position. Where you listen.

Could you place the measurment mic at suspected reflection points to determine if it is an reflection point?

No, a microphone will pick up sound anywhere in the room. Use amirror as described here:

Early Reflections

Or calculate as shown here:

How to set up a room

--Ethan

[skiroy]

Now what about the difference between checking with and qithout extra monitor sub.Obviously I will have a higher bass level with the sub on so what is the normal db and Freq range, I should be in whether the sub is on or off?

Also here is my results without the sub on and the mic is at my head,s listening position.My monitors are the Event ASP8s.Can anyone help make sense of this.








Sorry took awhile.First time posting pics froma host!

[skiroy]

Ethan?

[Ethan Winer]

Originally Posted by skiroy

Ethan?

What, am I supposed to be on call 24/7?

You should test with your sub engaged since (I assume) that's how you listen.

Also, you should adjust the display range for the graphs to have a total vertical span of maybe 40 dB or so. At 30 dB per division it's difficult to see the detail. Yes, the response will look much worse that way, but you want The Truth yes?

--Ethan

[ez135]

Originally Posted by Ethan Winer

What, am I supposed to be on call 24/7?

Of course! Don't forget that some people are used to have everything for free now: music, software, advice...

Ethan, I just want to thank you for all the great tips you give us around here. It's priceless. I'm sure the OP thinks the same way.

Skiroy, good luck with your room!

[skiroy]

Absolutely.I have learned more in the last 4months than in the last 4 years.Partly because I decuded to make this more than a hobby and mostly because of this site and people like Ethan.