New to REW-help

[Mtkluge]

Sorry I am completely new to this software and I'm trying to make a measurement with pink noise, but it's greyed out in the measurement section. I can turn on pink noise in the signal generator section but it turns off when I click the measurement tab. Any help would be greatly appreciated

 

[John Mulcahy]

REW doesn't yet support noise as a measurement stimulus, but you can use the RTA to view the response to pink noise (best using pink periodic) and save the RTA results as measurements.

 

[Mtkluge]

REW doesn't yet support noise as a measurement stimulus, but you can use the RTA to view the response to pink noise (best using pink periodic) and save the RTA results as measurements.

 

[Mtkluge]

Okay gotcha, I’ll try that. Thank you!

 

[Mtkluge]

So I’ve been able to take measurements from the listening position using the sweeps, but I keep getting a weird RTA readout. It looks like it’s referencing the pink noise, but I believe I have the mic setup correctly (the measurements look fine in the measurement tab.)

Any idea why it would look like this in the RTA? I’m trying to do a specific room
Calibration technique (moving mic technique) and I can’t seem to get an accurate RTA readout with pink noise. Any help with this would be great!

 

[John Mulcahy]

You have the mode set to spectrum, it should be set to one of the RTA choices. You have the frequency axis set to linear rather than log, click the button above the graph, 3rd from the right. You also have a very large SPL span, you can set the range using the graph limits button above the graph, 2nd from right.

 

[Mtkluge]

Thank you John! You’re helping me immensely. I have generated an Eq curve, and want your opinion on something. I have a pretty big dip at 75hz, and I’m manually compensating with EQ (+4db). Is that advisable? I’ll attaching two pics, one with the manual compensation and one without.

 

[Mtkluge]

Also that dip around 600-700hz...would you say that’s drastic enough to pay attention to or should I leave it? After all, we only have so many filters

 

[EarlK]

Also that dip around 600-700hz...would you say that’s drastic enough to pay attention to or should I leave it? After all, we only have so many filters

I would say that the "V"-shaped suckout centered on 800hz should be dealt with.
- You'll definitely be missing a lot of content with a hole that's as much as 6db deep and 1 octave wide ( at the shoulders ).

Do you by chance have a crossover point located there for your ( ???, not yet disclosed ) speaker?

If so, try flipping the polarity of the MF//HF unit.

 

[Mtkluge]

I would say that the "V"-shaped suckout centered on 800hz should be dealt with.
- You'll definitely be missing a lot of content with a hole that's as much as 6db deep and 1 octave wide ( at the shoulders ).

Do you by chance have a crossover point located there for your ( ???, not yet disclosed ) speaker?

If so, try flipping the polarity of the MF//HF unit.

Hey Earl! I don’t have a crossover, I’m using Thiel TM3’s through a Hafler P3100 power amp. Here’s a pic of the setup.

 

[Mtkluge]

So you think the dip around 600-800 is more concerning than the large dip @ 75 hz? Trying to find a good compromise

 

[Mtkluge]

Possibly moving them father off the back wall would help? I’d really like to get rid of that huge notch around 75 hz

 

[EarlK]

Sure, pull them further out from the wall and remeasure.

Any symetrical "V"-Shaped suckout like we see at 800hz is very suspect of being caused by extraneous factors ( SBIR, Floor-Bounce, Table-Bounce >> all into the test mic ).

You'll need to be creative to determine it's cause + then to deal appropriately ( if possible ).

The 75hz is going to be a room mode >> moving the speakers.forward might step the speakers out of that room mode >> you'll need to experiment with locations.



PS; both the 75hz and 800hz notches need to be dealt with ( IMHO ).

Their presence will both translate ( badly ) into your mix.

 

[Mtkluge]

Could anyone give me advice about these EQ curves? Good enough to play ball? I have a minidsp 2x4 I will be loading these EQ’s into