Hi everyone. Just a quick question.  If i have a dip at 120htz , will it benefit if I go into the lpf for lfe setting in the avr and change it from default 120htz to 100 htz.? Also if I go into the audussey app and change the multi frequency range for the subs from 250htz to 100?

Thankyou. 

 

On 13/10/2025 at 8:43 AM, jmouss said:

Hi everyone. Just a quick question.  If i have a dip at 120htz , will it benefit if I go into the lpf for lfe setting in the avr and change it from default 120htz to 100 htz?

I don't see why doing that would reduce a dip at 120Hz.

 

On 13/10/2025 at 8:43 AM, jmouss said:

Also if I go into the audussey app and change the multi frequency range for the subs from 250htz to 100?

 

Are you referring to the crossover frequency between subwoofer(s) and speakers?

14 minutes ago, Satanica said:

I don't see why doing that would reduce a dip at 120Hz.

 

 

Are you referring to the crossover frequency between subwoofer(s) and speakers?

Hi.  After running audussey through the app.  Audussey has tried adding correction to the subs from  250htz and under.  I might be able to share a pick. 

OK, well I think if you change the correction range from 250Hz to 100Hz then that would be going backwards about addressing the 120Hz dip, because then it would not be in the range of correction. I think is 250Hz is a good correction range and I use similar myself with Dirac Live.

Just now, Satanica said:

OK, well I think if you change the correction range from 250Hz to 100Hz then that would be going backwards about addressing the 120Hz dip, because then it would not be in the range of correction. I think is 250Hz is a good correction range and I use similar myself with Dirac Live.

Ok.  Do you suggest i should maybe invest in a minidsp or purchasing dirac live. Then I need to learn how to use them.  

Just now, jmouss said:

Ok.  Do you suggest i should maybe invest in a minidsp or purchasing dirac live. Then I need to learn how to use them.  

I won't suggest that at this point. But, if you were wanting to go with Dirac Live, then also include Dirac Live Bass Control if your audio processor supports it. What do you think are your deficiencies or areas that could be improved with your sound system now?

Thanks for your replies.  To be honest I'm all about the bass.  I have a 2 channel set up.  Two book shelf speakers,  and your gonna probably think I'm nuts,  but I have 3 power sound audio 15 inch monsters in a small bedroom.  It sounds really nice.  I hate when one movie scene sounds so nice, but then in another scene it doesn't.  Could that be because my room might be too small or it's how that particular scene is recorded? 

A dip at 120Hz may be due to XO phase cancellation or it may be due to a room mode. The way to tell the difference is to measure at 1m, 2m, and 3m. If it's a room mode, it will shift. If it's XO phase cancellation, it will stubbornly remain at 120Hz. 

 

I have no idea why one movie sounds great and another doesn't. To answer that question, I would need to see an MDAT. I have been frustrated by dozens of people posting poorly taken measurements on another forum, so I have been writing a free REW guide. I will make an announcement when it is ready. 

3 minutes ago, Keith_W said:

A dip at 120Hz may be due to XO phase cancellation or it may be due to a room mode. The way to tell the difference is to measure at 1m, 2m, and 3m. If it's a room mode, it will shift. If it's XO phase cancellation, it will stubbornly remain at 120Hz. 

 

I have no idea why one movie sounds great and another doesn't. To answer that question, I would need to see an MDAT. I have been frustrated by dozens of people posting poorly taken measurements on another forum, so I have been writing a free REW guide. I will make an announcement when it is ready. 

Thanks Keith. I had a guy named Chris come to my house the other day,  a real nice guy.  And he helped me set up rew and we took a measurement.  What we got was a dip at 120 and one around 68htz.

That's normal. Diagnosing the cause is a bit more difficult, deciding what to do about it is even harder. 

For some reason,  I feel like it's not just me,  but many struggle to find that perfect blend. 

5 hours ago, jmouss said:

Thanks for your replies.  To be honest I'm all about the bass.  I have a 2 channel set up.  Two book shelf speakers,  and your gonna probably think I'm nuts,  but I have 3 power sound audio 15 inch monsters in a small bedroom.  It sounds really nice.  I hate when one movie scene sounds so nice, but then in another scene it doesn't.  Could that be because my room might be too small or it's how that particular scene is recorded? 

When a movie scene does not sound nice, is it because it sounds like there is too much bass, or not enough, or something else?

It might be the room, a way a scene is recorded, or a combination of both, and/or something else. 🙂 Sorry at the moment I think there are more questions than answers, but I'll try and Keith_W is very knowledgeable and experienced.

Edited October 14, 2025Oct 14 by Satanica

On 13/10/2025 at 10:13 AM, jmouss said:

Hi everyone. Just a quick question.  If i have a dip at 120ht

Hello

 

Dips in bass, usually accompanied by a peak up the frequency range within the listening room, below the point where sound is omnidirectional is normally explainable with access to,

 

Position of measurement mic in the room, measurement graphs can change dramatically across the room., especially bass.

Room dimensions, all rooms will create a resonance with cancellation and addition sound magnitude across the space. Nulls in the middle areas of room and peaks in corners and room boundaries are the usual experience.

Position of subwoofers, normally addition of subwoofers are of benefit, however if not positioned correctly may well cause a magnitude cancellation at the listening position.

Personally experienced the same thing with 2 pairs of 21" drivers in 650 liter enclosures, where as at the listening position there was a literal null point at 22Hz, peak at 52Hz and another peak at 110Hz.

 

No amount of equalization did anything to remedy this situation, even out to + / - 12dB. with powerful new processors and multiple measurements. Real head scratcher.

 

The only way the problem was partly fixed was to move the large enclosures to an optimal position in room, moving the listening position away from the rear wall and apply copious amounts of room treatments aimed at the lowest possible treatable frequencies, with hand made, tuned, weighted limp membranes, air chambered multiple layer bass traps of in excess of 12m2 across 3 walls, which to be fair took weeks of full time work, lots of money and months to calibrate to where it is now.

 

If you have time please describe in detail the dimensions listening room  and the amount of room furniture, position of speakers and subwoofers, any measurements performed, is there any room treatments ? 😊

The aim is not so much to blurt out a remedy but to help understand how subwoofer positioning can work wonders, just for a start.

 

I'm a bass first type listener as well ,what movie are you watching ?

 

Cheers

Good luck.

 

 

 

Edited October 14, 2025Oct 14 by playdough

16 hours ago, jmouss said:

For some reason,  I feel like it's not just me,  but many struggle to find that perfect blend. 

 

Do you have a measurement microphone and REW? The reason so many people struggle is because they try to blend subwoofers with their ears. It's a futile exercise. Doing a level match is easy, doing time and phase alignment is a little bit harder. Achieving perfection - that's a struggle. 

Yeah Keith, I measured the response a few days ago.  That's how I got those results. 

In that case, the answer as to why one movie sounds good and another doesn't is hidden somewhere. Your measurements may already explain it, or you may need to take new measurements. You may need to extract the audio from your movies and compare the spectrograms with Audacity. It all depends on how much it bothers you and how determined you are to get to the bottom of it. But I guarantee you - if it's real, the answer will be in there somewhere. 

how have you related the difference in sound quality between movies to the 120hz dip?

 

will