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Dips vs Peaks in frequency response

poleepkwa, modified 6 Years ago.

Dips vs Peaks in frequency response

Youngling Posts: 6 Join Date: 12/5/12 Recent Posts
This is a repost from the room acoustics forums. I assume that my post was missed, so I am reposting it here.

I was one of the lucky ones this year and the Genelec boys stopped by during the Genelec Kalibrointikiertue 2014
and measured my little home theatre. After an informative discussion I decided to move the speakers (8040a') around and see if I could improve on the big dip I had between 200-300 Hz. I lifted the center up so that all the speakers are now on the same height. All speakers are wallmounted so it took a while. After much experimenting and measuring this was the best I could do.

Now my real question is: Genelec recommended during the calibration that not to use the Bass tilt as it further increased to dip in the bass response. I have now moved the speakers up and the dip is a bit smaller than it used to be. Looking at the measurements of my speakers, which one of the settings are more neutral and why? I am needing some guidance as to what I should be looking at to get a more neutral response. For stereo I use the Fronts without any calibration. Audyssey XT32 does a pretty good job integrating the subwoofer and mains, it however boosts the dips so don't know if that's a good thing or not. Thank you for your time and assistance.

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ilkka-rissanen, modified 9 Years ago.

Re: Dips vs Peaks in frequency response

Yoda Posts: 2564 Join Date: 3/23/09 Recent Posts
Hi,

In general, neutral means relatively flat response but typically totally flat sounds too thin for most of us. Your response is flatter with the -2 dB bass tilt engaged but the difference is so small that I can't say which one sounds best in your room and to your ears. Which one do you prefer?

For center channel I would choose -4 dB bass roll-off and -2 dB bass tilt because you will get more energy below 150 Hz with that setup.
poleepkwa, modified 6 Years ago.

Re: Dips vs Peaks in frequency response

Youngling Posts: 6 Join Date: 12/5/12 Recent Posts
Thank you for your reply.
I will do that and see how it feels on the centre. Actually I prefer it with the BT-2 as the bass seems tighter and less loose. However I am concerned that it deepens the dip in my freq response inbetween 200-300 Hz.I include the measurement for the left and right speakers to its easiers to see.
Does the 1-2 db I lose with the BT-2 outweight the benefits that it brings?
On the big scale of things how good are these measurements? (meaning is this a fairly good measurment result?)
Thank you

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ilkka-rissanen, modified 9 Years ago.

Re: Dips vs Peaks in frequency response

Yoda Posts: 2564 Join Date: 3/23/09 Recent Posts
Unfortunately it is quite impossible for me to say that. Measurements are just a start and should be taken as general guideline but final adjustments should be done by ear.

On a general level your frequency responses are good, especially above ~400 Hz. 5 dB window is a very good result. How does the RT60 curve look like?
poleepkwa, modified 6 Years ago.

Re: Dips vs Peaks in frequency response

Youngling Posts: 6 Join Date: 12/5/12 Recent Posts
Thank you Ilkka, I got so caught up in the measurements I forget to actually listen :lol:
Here is the RT30 from the Genelec calibration round. I can also post the RT60 later if needed.

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