Main speakers have lower extension than subwoofers

[raindance]

If the subwoofers have EQ then you could use them to fill in that area and avoid doing it in the mains.

 

[Sokel]

If the subwoofers have EQ then you could use them to fill in that area and avoid doing it in the mains.

The positive gains you're using would need kW for optimal playback, even below reference levels.
Either that or your SNR will plunge to not nice number as the gain staging will suffer.

Find another way to fix the dips (placement, passive treatment, etc) or leave then alone.
And remember, filing a dip at one place creates a problem to another.

 

[kyuu]

And remember, filing a dip at one place creates a problem to another.

That's a good point to bring up. Are these single-point measurements? You might want to try using MMM instead to see if that dip is as big an issue as it appears. You can also simply play a test tone and sweep from just above to just below that frequency range; a 10dB dip that low-Q should be easily perceptible if it's not just an artifact of the measurement method.

The moving microphone method (MMM) for Dummies using REW

After getting a couple of weird results on my first MMM measurements, I went searching around the forums & YouTube for what went wrong. To save others from gathering various bits and pieces of info from a dozen sources, I decided to publish this quick write-up here. You can use it as a rough...

www.audiosciencereview.com

 

[sigbergaudio]

The 90-120hz dip you have now after moving your speakers closer to the wall is pretty normal to see, and not anything to try to fix with EQ, definitely not with +12dB. If you have an app or whatever that suggests that, you should throw it away. If you have the headroom you can add perhaps +3dB. An alternative would be to get an external crossover so that you can highpass the subs and have them to play to 100hz instead. But this dip isn't necessarily something that is very noticeable.

What is perhaps stranger is that the bass looks very lean. 100hz and below should be 3-10dB higher than the rest of the frequency range, here it looks like frequency range below 100hz is lower. This rarely sounds right.

 

[sigbergaudio]

How are the measurements done? From the listening position, or perhaps closer to the speaker? If so, what distance?

 

[raindance]

How are the measurements done? From the listening position, or perhaps closer to the speaker? If so, what distance?

Honestly I think there's a high pass filter in play and he's equalizing to compensate.

 

[unmutual]

Hmmm, if I am not going to attempt to smooth out peaks and walleys, then how does one do room correction at all?

There is no HPF in play. The text on the graph tell you what I measured, and the PEQ filters applied. I have measured from two different listening positions, the most favorable one is appr. 2 meters from the speakers, which are 1.6 meters apart from each other and towed inwards.

 

[unmutual]

And the last measurements are without subs btw, only main speakers.

 

[sigbergaudio]

Hmmm, if I am not going to attempt to smooth out peaks and walleys, then how does one do room correction at all?

There is no HPF in play. The text on the graph tell you what I measured, and the PEQ filters applied. I have measured from two different listening positions, the most favorable one is appr. 2 meters from the speakers, which are 1.6 meters apart from each other and towed inwards.

1. So the graph in post #18 is 2 meters from the loudspeakers?
2. Which microphone are you using, and is it calibrated?
3. How does the bass sound to you?
4. Is this a very small room since you are sitting so close and the speakers are so close together?
5. What are you using to apply EQ?

You can use EQ to smooth out peaks, you should not use EQ to smooth out valleys / dips. From the EQ points listed in that graph, I would (assuming the measurements are accurate):

1. Remove the one at 35hz, the bass level is so low that you don't want to dampen this.
2. Reduce the EQ level of the one at 105hz to maximum 3dB.
3. Reduce the EQ level of the ones at 137hz and 164hz to -3dB.

 

[unmutual]

Thanks sigbergaudio, sent you a PM