Dirac bass control not fixing peaks and nulls

[hardcore_gamer99]

I also tried to bump up frequency range 20 to 36hz by 6db and decreased peak at 42hz by 6db then saved filter but still REW shows same curve exact though i can hear now more SPL in low end. But rew showing up same curve. with dip and peak

 

[Trell]

Bumping up bass frequencies dips is an iffy proposition and very often does not bring anything to the table. For my HT (two subs) I did try to bump up the sides of the nulls to make them more narrow but kindof meh for me in my setup in my room.

Like you I did measure, but also listen.

 

[j_garcia]

That is a pretty big dip. Seems you have a room or placement issue. I'd start with adjusting the location of the speakers.

Cutting a peak is usually not so bad, but I agree, increasing in an attempt to smooth a big dip usually does not work. I had a crazy null like that when I had a square room. I ended up moving the listening position to mitigate it, but you could walk around the room and easily hear the spots where the nulls were.

 

[Verdinut]

Several years ago, I had built an 8 cf enclosure for a 15 inch subwoofer. It was placed in the center of the living room and used as a coffee table as well. I still remember its smooth low frequency response. Of course, it was well designed but this smooth response was also not affected by room gain.

IMO, the center area of a room location is the best spot when you can do it, especially for an audio system using only one subwoofer. It's worth a try!

 

[hardcore_gamer99]

Bumping up bass frequencies dips is an iffy proposition and very often does not bring anything to the table. For my HT (two subs) I did try to bump up the sides of the nulls to make them more narrow but kindof meh for me in my setup in my room.

Like you I did measure, but also listen.

i can hear more spl with ears but rew shows exact same curve

 

[hardcore_gamer99]

That is a pretty big dip. Seems you have a room or placement issue. I'd start with adjusting the location of the speakers.

Cutting a peak is usually not so bad, but I agree, increasing in an attempt to smooth a big dip usually does not work. I had a crazy null like that when I had a square room. I ended up moving the listening position to mitigate it, but you could walk around the room and easily hear the spots where the nulls were.

i dont have space so can put in front only but i am worried about 23 to 36hz area a bit of dip i wish could smoothen it

 

[hardcore_gamer99]

Several years ago, I had built an 8 cf enclosure for a 15 inch subwoofer. It was placed in the center of the living room and used as a coffee table as well. I still remember its smooth low frequency response. Of course, it was well designed but this smooth response was also not affected by room gain.

IMO, the center area of a room location is the best spot when you can do it, especially for an audio system using only one subwoofer. It's worth a try!

i have square room

 

[j_garcia]

Square room is tough. You might need some treatments, basic bass traps for the corners if possible.

 

[Trell]

Square room is tough. You might need some treatments, basic bass traps for the corners if possible.

Moving the speakers and listening position can help as well.

 

[hardcore_gamer99]

Moving the speakers and listening position can help as well.

nothing is helping. i tried many mlps and subwoofer as well. guess have room modes

 

[Trell]

nothing is helping. i tried many mlps and subwoofer as well. guess have room modes

I've a small room too and it is a challenge with many compromises.

 

[Verdinut]

i have square room

With that square room, you would probably still avoid some of the room gain which boosts the low frequencies. Acoustically, its the worst horizontal room dimensions. Unfortunately, you would be better off with good headphones.

 

[hardcore_gamer99]

I can confirm that older version of dirac for windows is not having these issues. But what latest dirac live version doing is that with bass control filter it is killing the bass but will dirac only there is no such issue. Anyone can confirm this if using latest version? For example spectre opening scene has huge sound pressure for my room but with bass control it was killling bass there was not much that pressure. But now with old dirac software its all good for all movies. I hope dirac will do something to this.

 

[William Lemmerhirt]

I also tried to bump up frequency range 20 to 36hz by 6db and decreased peak at 42hz by 6db then saved filter but still REW shows same curve exact though i can hear now more SPL in low end. But rew showing up same curve. with dip and peak

Well this is fun! My take after looking at the two graphs, it looks like the same shape, but the peak came down a bit, and the null( more of a recessed area)came up. It is hard to tell somewhat because the scale of each graph is different from each other.(vertical scale should be 45-105 for a 60db window).
The main thing is to use positional eq first which it sounds like you have. Secondly, focus on removing peaks first. This will flatten the curve, and provide more balance overall.

Square rooms are horrible for bass, and the worst thing you can do is try to boost nulls too far. While you normally can get some improvement, the reason it’s a null in the first place is because it’s a cancellation due to the sound waves interacting with the room. When adding boost, it causes the subwoofer to work harder to compensate, but it is still cancelled at the MLP so even though the subwoofer is providing more output, you can’t hear it so all you’re doing is reducing headroom, and adding distortion. That’s why it’s better to reduce peaks to meet the nulls. It’s also why, if using some type of EQ that corner loading can help. Because it excites ALL the room modes at once, then you just have to pull down the peaks.
So if it were me, I would try and pull down those peaks and remeasure. You may have to double check the DB level afterwards.

 

[William Lemmerhirt]

i can hear more spl with ears but rew shows exact same curve

It looks like the same shape, but from what I can tell from the REW sweep, it looks like the scooped area did come up. That’s why you would hear more even though the response shape looks the same.

 

[isolar8001]

I can confirm that older version of dirac for windows is not having these issues. But what latest dirac live version doing is that with bass control filter it is killing the bass but will dirac only there is no such issue. Anyone can confirm this if using latest version? For example spectre opening scene has huge sound pressure for my room but with bass control it was killling bass there was not much that pressure. But now with old dirac software its all good for all movies. I hope dirac will do something to this.

Just use the older version and be happy then...what works, works.

Developers often screw up perfectly fine software in attempts to update and refine it to keep the business model rolling.
For what Dirac charges for their software, they should send someone out to do all of this for you !

 

[hardcore_gamer99]

Just use the older version and be happy then...what works, works.

Developers often screw up perfectly fine software in attempts to update and refine it to keep the business model rolling.
For what Dirac charges for their software, they should send someone out to do all of this for you !

Yes after using old dirac checked movies like spectre twister no time to die fast x etc all have good spl now

 

[TLS Guy]

I have been following this thread. You have not provided nearly enough information for sensible comment.

What are you speakers and where are they placed?

Those dips are very narrow and probably not highly audible. That 90 Hz dip looks to me as if your mains and sub are out of phase at crossover. I say that as it is what that would look like with a crossover around 80 Hz. Reverse the phase of your sub 180 degrees and see what happens.

What is the distance from the wall behind your front speakers? I have a hunch that the higher frequency dip is antiphase reflection from the back wall behind the speakers causing cancellation.