Can wiim do the following? High and low passing

[alaios]

So pick the most advanced wiim device and then help me understand if the below are possible.

Can i high pass my main speakers and relieve them from having to try to go too low?
Then can I high pass (yes high pass) my sub (sub out) as these are smallish and do not got really below 40Hz. I would like also to relieve them of having to try to play 30 or 20Hz.

Are such things possible with wiim ? If yes where I can read before buying the guides/tutorials

Regards,
Alex

 

[hgo58]

He wants the sub to work between 40Hz and 80Hz and the main speakers to work at 80Hz and above. So a crossover at 80Hz and a High Pass PEQ filter at 40Hz if that is possible.

Yes. That is what @Wiimer explained in comment #5. Don't look like being the wanted answer.

 

[slartibartfast]

Yes. That is what @Wiimer explained in comment #5. Don't look like being the wanted answer.

Or a misunderstood answer

 

[Wiimer]

So pick the most advanced wiim device and then help me understand if the below are possible.

Can i high pass my main speakers and relieve them from having to try to go too low?
Then can I high pass (yes high pass) my sub (sub out) as these are smallish and do not got really below 40Hz. I would like also to relieve them of having to try to play 30 or 20Hz.

Are such things possible with wiim ? If yes where I can read before buying the guides/tutorials

Regards,
Alex

To achieve what you want to do, set it up like this.

1) Set the crossover to 80hz (or higher) in the subwoofer settings.


2) As indicated in post #5, use PEQ to reduce gain below 40hz.


The result of this,
Main speakers are highpassed at 80hz.
The sub is low-passed at 80hz.
The sub is (pseudo) highpassed at 40Hz.

 

[harkpabst]

I should have quoted only this part to make it perfectly clear. So, let's try again.

1. I can put a crossover frequency for the sub that does also a high pass for main speakers

Yes, exactly. That's how it works.

When you enable the subwoofer output (available on WiiM Ultra, WiiM Amp Pro and WiiM Amp) you find a crossover frequency slider like so:


You can freely set the crossover frequency between mains and sub from 30 Hz to 250 Hz. No matter which value you choose, the result will always be both, a 4th order Linkwitz-Riley low pass for the sub and a matching 4th order LR high pass filter for the mains.

This is ideal if you have small main speakers or full range speakers.

2. The sub gets all frequencies below the cutoff frequency and the PEQ where you did this example above

Correct again. With no additional PEQ applied the sub will get all the frequencies below e.g. 80 Hz. More precisely, the sub level will be down by 6 dB at 80 Hz and higher frequencies are attenuated by 24 dB per octave.

When combined, the frequency response of mains and sub is perfectly flat again.

I understand that you not only want to relieve your main speakers from the low frequencies fed to the subwoofer. You also want to make sure your small sub doesn't have to cope with the lowest frequencies, which it cannot reproduce anyway, but just cause distortion. And yes, another high pass filter at 30 to 40 Hz would be the natural choice here.

WiiM PEQ cannot exactly do that, but it can do something that serves the same purpose. While PEQ filters cannot be of type "high pass", you can e.g. employ a low shelf filter like this:


The result is not a true high pass filter, but it will dramatically reduce the low frequencies fed into the subwoofer. If you want even more attenuation, just add one more low shelf filter, e.g. like this:


This will be as effective as a high pass filter

@Wiimer has shown an alternative approach in posting #5 using just peak filters. This will also work.

Is this more clear?

 

[Mr Ee]

Is this more clear?

What I wrote in post #2, but with pictures

 

[Wiimer]

View attachment 17594

The result is not a true high pass filter, but it will dramatically reduce the low frequcies fed into the subwoofer. If you want even more attenuation, just add one more low shelf filter, e.g. like this:
View attachment 17595

My post looks like a child's composition .

Off topic, when were the LS and HS graphics fixed? I finally noticed it when I saw your screenshot .

 

[harkpabst]

What I wrote in post #2, but with pictures

Yep, I know. Didn't get through.

Off topic, when were the LS and HS graphics fixed? I finally noticed it when I saw your screenshot .

Unfortunately not. I wanted to check this before saving my post, but then forgot. A Q of 0.25 (as shown in my pictures) might not do what it says on the tin. I'd have to measure if the shown frequency response rather fits a Q of 0.7.

 

[canard]

So pick the most advanced wiim device and then help me understand if the below are possible.

Can i high pass my main speakers and relieve them from having to try to go too low?
Then can I high pass (yes high pass) my sub (sub out) as these are smallish and do not got really below 40Hz. I would like also to relieve them of having to try to play 30 or 20Hz.

Are such things possible with wiim ? If yes where I can read before buying the guides/tutorials

Regards,
Alex

I understand your idea of a cut below 30hz ( less of 30hz)...but basically you don't have much to worry about because quite simply your subwoofer will barely be used in terms of level at these frequencies...so it's not an effort for it... (except in rare cases on the music side, or problems with vinyl etc.)... not that it can't be useful to have these frequencies, but their level will be very low.... I'm talking about music here, not home cinema
(This is actually a funny and misunderstood thing... in the case of acoustic music for example it is quite possible to support the extreme bass (<35hz)with a small subwoofer......except in special and quite rare cases)

 

[harkpabst]

When measured Shows Lot of distortion. I want to high pass it

 

[canard]

don't mean anything
what mesures?
We must understand the real levels encountered in what we listen to...and at what frequencies...
(ps non-musicians very rarely manage to locate the frequency of what they hear... )

 

[Wiimer]

Unfortunately not. I wanted to check this before saving my post, but then forgot. A Q of 0.25 (as shown in my pictures) might not do what it says on the tin. I'd have to measure if the shown frequency response rather fits a Q of 0.7.

Yeah, I was mistaken .

 

[harkpabst]

don't mean anything
what mesures?
We must understand the real levels encountered in what we listen to...and at what frequencies...
(ps non-musicians very rarely manage to locate the frequency of what they hear... )

Why would we?

Somebody asks if he can high pass filter his subwoofer. The answer is: Yes, but it needs a little bit of trickery.

Why should the user have to prove the usefulness of his request before he deserves an answer? This is not about sub localisation at all, btw.

 

[canard]

Yeah, I was mistaken .

View attachment 17601

It would be good if Wiim finally looked into this subject of the real graphic representation of the corrections, or even allowed a full screen landscape mode etc. and with autogain of course... (just talking about the peq modes)

 

[canard]

Why would we?

Somebody asks if he can high pass filter his subwoofer. The answer is: Yes, but it needs a little bit of trickery.

Why should the user have to prove the usefulness of his request before he deserves an answer? This is not about sub localisation at all, btw.

I was just talking about the general topic of the idea of needing to cut below 30hz...with a small subwoofer
("Then can I high pass (yes high pass) my sub (sub out) as these are smallish and do not got really below 40Hz. I would like also to relieve them of having to try to play 30 or 20Hz.")

 

[harkpabst]

(ps non-musicians very rarely manage to locate the frequency of what they hear... )

This is not about cutting below 30 Hz, or is it?

 

[canard]

there is no need to simply relieve them...because they will not be solicited, with level, in general at these frequencies...simply..
i react a the first post of the thread
end for me...

don't want any misunderstandings due to language between us..

 

[slartibartfast]

Why would we?

Somebody asks if he can high pass filter his subwoofer. The answer is: Yes, but it needs a little bit of trickery.

Why should the user have to prove the usefulness of his request before he deserves an answer? This is not about sub localisation at all, btw.

I don't think he meant sub location, I think he meant they can't tell which frequency they are listening to

 

[canard]

I don't think he meant sub location, I think he meant they can't tell which frequency they are listening to

place on the frequency scale
;-)
(the "musical" extreme bass (<35hz) is very useful, in acoustics in particular, but is not difficult to reproduce because, except in special cases, there is no level...between 45 and 100hz...there it is complicated ;-)
you really have to decorrelate what is happening "to measure" constant full band high level...and reality in audio use...( not effects hc) )

good luck with the "remote assistance"..and congratulations for "your" generosity in helping...
;-)

 

[alaios]

Sorry I don't understand why you want that. Then there will be no sound.

I think you're misunderstanding something. Please read the FAQs!

There are 10 PEQ settings.

I want the following.
Main Speakers play all frequencies from 80Hz and above.
Subwoofers play all frequencies in the range of 40-80Hz.

How can I Implement the above?

 

[alaios]

And post #2 already explained that this is not possible.

However, a high shelf filter or even a low frequency peak filter will achieve basically the same result.

It's all been explained before.

what is a high shelf filter