Is there such thing as dynamic EQ? For example I want to decrease 15-20 Hz to avoid port noise, but I want to decrease it only if it's above 80 db

[Multicore]

It seems that what I need is called a multiband compressor or a dynamic EQ. Now I just need to find one that will work well in my case. I've just tried TDR Nova and while it works, the slope that I was able to make is very shallow, even affecting 100 Hz. I was not able to make it steep below 20 Hz (blue line is the dynamic EQ that's applied when the treshold is breached and yellow is static EQ):

View attachment 476788

Nova is pretty good and suitable for your problem. I use it but not for listening. Apart from anything else is has a great UI to help you learn the relationships among settings, technical effects and and sound.

 

[Multicore]

That is still a bandaid fix, to address the bad design issue which is the port chuffing.

Maybe or maybe it is a well designed speaker operated beyond its limits. You could fix it with better speakers but maybe you didn't really want that much bass, in which case limiting it might satisfy.

 

[Pareto Pragmatic]

You can always make a few different presets in eq apo and switch them manually based on volume.

Likely two would be enough for most purposes. Going WAY over 80 would need more.

One thing is for sure, 2 would be a good way to test and see if that's sufficient to address the problem. Quick, easy, free... the perfect first approach to try.

 

[Palmspar]

Selll the subs and go with big sealed ones maybe?
Good sealed subs extend to 10hz flat inroom and no port noise.

 

[PashkaTLT]

That is still a bandaid fix, to address the bad design issue which is the port chuffing.
(Sure, one can stack workarounds on top each other.)

This is not a band aid fix. It can work great. I currently just decreased 10-15 hz permanently and port chuffing has disappeared.

ANY ported subwoofer will have port chuffing at high enough SPL.

 

[Palmer]

A de-esser is what is used to dynamically eq, for example - in this case the frequency is just a lot lower, still does the job. Plenty of info all over the interweb.

 

[PashkaTLT]

Fabfilter Pro Q-4 would be another excellent choice for the dynamic EQ

Thanks a lot! FabFilter Pro Q-4 worked perfectly! It's hands down the best one among like 4 different Dynamic EQs that I tried.

Basically, it only decreases frequencies below 15 Hz when the threshold is breached.
Problem solved!

 

[mhardy6647]

What's that bass/horn/tweeter on the right?

Those are my Frankenaltecs. Started out with 604E Duplexes/MasteringLabs XOs in the enclosure designed by Bill Fortin. Lovely sound, but limited treble dispersion led me to start experimenting (I am an experimental scientist, after all! ). They currently sport 515B woofers, 802D treble drivers on EMILAR EH-500-2 horns (with the proper EMILAR throat adaptors) and B&C DE35 neodymium "bullet" tweeters crossed very high and used as de facto supertweeters ("super" ain't what it used to be, at least for my superannuated ears ).

Billforts Audio Obsession

They don't sound better than the Duplexes, but they do sound better throughout more of the room than the Duplexes did.
They are incredibly satisfying to listen to -- but I am a sucker for that ol' Altec Technicolor midrange.

My friend Mike Berg built the Baltic birch cabinets for me 15 years ago.

Photo taken a few days after MIke delivered them to "House 3.2" (our Massachusetts house, which underwent two fairly substantial tranches of renovation during the 23 years we lived there ).

 

[Holmz]

This is not a band aid fix. It can work great. I currently just decreased 10-15 hz permanently and port chuffing has disappeared.

ANY ported subwoofer will have port chuffing at high enough SPL.

You might be right, but aeroports and passive radiators are also helpful for mitigating chuffing.

 

[teashea]

Yes - there are dynamic EQ's. They are used often in music production. One is part of the SSL Bus+. You can download the user guide to read about it. I have a Bus+ and the dynamic EQ is quite interesting and useful.

However, it will not help you in this instance. Why do you need reproduction of frequencies below 30 Hz? There is virtually no music with content that low except for a pipe organ.

 

[Keith_W]

I'm not even sure if you can do dynamic EQ with FIR? Most probably, the dynamic EQ is just a minimum phase implementation.

Yes you can. The new version of Acourate Convolver allows dynamic EQ:

The author sent me that to test. It will be pushed out to all users shortly, if it hasn't already. This is a linear phase EQ. As you correctly stated, there is a slight delay before the EQ is applied, about half a second. There are VST plugins that are minimum-phase, but the signal still has to go through the FIR pipeline so the latency is unavoidable.

 

[PashkaTLT]

However, it will not help you in this instance. Why do you need reproduction of frequencies below 30 Hz? There is virtually no music with content that low except for a pipe organ.

To be honest, I get annoyed when people tell me this.
If you don't listen or don't know music with frequencies below 30 Hz it doesn't mean there's no such music or nobody listens to such music.
There's PLENTY of music with frequencies below 30 Hz.

 

[Holmz]

To be honest, I get annoyed when people tell me this.
If you don't listen or don't know music with frequencies below 30 Hz it doesn't mean there's no such music or nobody listens to such music.
There's PLENTY of music with frequencies below 30 Hz.

What is it?
Do you have a list for me to check out?

 

[NotInYourHead]

Yes you can. The new version of Acourate Convolver allows dynamic EQ:

View attachment 476947

The author sent me that to test. It will be pushed out to all users shortly, if it hasn't already. This is a linear phase EQ. As you correctly stated, there is a slight delay before the EQ is applied, about half a second. There are VST plugins that are minimum-phase, but the signal still has to go through the FIR pipeline so the latency is unavoidable.

Keith, a bit off-topic, but can I ask what's the best software to apply room corrections on Windows rn, with good UI? I'm using EqualizerAPO

 

[Yasuo]

EqualizerAPO can use VSTs, although there's a limitation of not receiving any visual feedback (like levels, waveform, meters etc) when configuring the plugins. Oh and and sometimes it may crash...

 

[ShadowBoxer]

FabFilter Pro Q-4 worked perfectly! It's hands down the best one among like 4 different Dynamic EQs that I tried.

I would hope so at a cost of $200, correct?

 

[Keith_W]

Keith, a bit off-topic, but can I ask what's the best software to apply room corrections on Windows rn, with good UI? I'm using EqualizerAPO

Hmm, I assume you are talking about FIR and not IIR? IMO the best convolver on the market is Hang Loose Convolver, because it ticks all the boxes for me - easy filter loading, web remote control, ability to take output from a sound card, ability to have filter banks and switch between them instantly. The biggest killer feature for me is that it can host VST's. This simplifies the software chain a lot!

There is also CamillaDSP. It's free, but it's a real bear to install. I also use Acourate Convolver - it's great, has a lot of features, but the major downside is that you need to use Acourate to generate proprietary CPV files for it. I suspect it may be possible to use rePhase to convert .WAV files to .CPV but I haven't tried it, and it's inconvenient.

If you have a JRiver or a Roon license, you can also use those to apply room corrections.

There are a whole bunch of others - EKIO, Audiolense Convolver, etc. I haven't tried any of them so I don't know.

 

[ppataki]

I use Dirac Live and I love it
I need multichannel processing so I use Jriver and apply Dirac Live Processor as a VST plugin combined with other VST plugins (those are pre-Dirac and post-Dirac)

 

[Keith_W]

Yes you can. The new version of Acourate Convolver allows dynamic EQ [...] This is a linear phase EQ.

I need to correct this statement. Uli saw this post, emailed me, and told me it's minimum phase. Apologies to all.

 

[ppataki]

I need to correct this statement. Uli saw this post, emailed me, and told me it's minimum phase. Apologies to all.

Those who need that in linear phase mode can still fall back to Pro Q-4 though