Romy The Cat idea about Room Acoustics:

I do not believe in acoustic treatment for low frequency, unless you do monumental architectural changes in your room. The existing acoustic treatments do very unproportional treatment as very effective and a higher frequency. So, when you use them to treat your 100 Hertz they make reverberation time at 1000 cycles much shorter than you would like it to be as they're much more effective at higher frequencies. So, for 10% of correction 100 Hertz you create 300% damage at 1kHz. To treat some corners, VERY moderately it still might be OK but it is about it. My approach to dealing with the problem like this is very different and I I have written a lot about it.

This statement is so general that it becomes intrinsically false. Unless we have all the details it just introduces noise in any decent discussion about room treatments. BTW If we want discuss room treatments we should focus on the proper way of doing them, not just enumerating the problems of a few anecdotal cases - every one is an expert on negatives.
 
Thank you very much for taking all the time to write this very detailed, insightful and comprehensive visit report, Al! I know you have a great deal of experience on the sound of acoustic instruments. You know what to listen for in acoustic instruments and can perceive nuance that is literally beyond my recollections of live concert experiences. That's why I was so thrilled that you seemed to like the system!

You now have had the second most visitor ear time on the system, after David Blumenstein who spent over 20 hours in front of the system over eight days.

Honestly, I anticipated before your visit that you would not like the system in certain big ways. I know how sensitive you are to driver discontinuity. I don't hear driver discontinuity between the towers, but I never have been sensitive to driver discontinuity. (How many people owned Martin-Logan Monoliths?)

I assumed the discontinuity was there, and I just wasn't hearing it, or I wasn't consciously bothered by it. So for you to find no material driver discontinuity between the different topology towers was quite a wonderful surprise to me.

I'm glad we experienced Beethoven's Ninth Symphony together, from start to finish! I never had heard the entire performance before on a stereo in one sitting. (On these big classical pieces Kedar always told me to just head straight for the finales -- drop the stylus on the last inch of the record. But on this symphony my favorite movement actually was the first movement.)

Thank you, especially, for the critiques. When people visit I suggest to them that only criticism helps me move the system forward sonically.

I agree that the lower midrange ideally could use a little more oomph. I'm still thinking about replacing the tubes in the amps with KR Audio KT-88s. Also, the more I can eliminate the room boom issue, the slightly higher I can raise the woofer level -- which will tend to fill in and plump up the lower midrange. A third AVAA is on its way.

Yes, less than continuously full ooomph in the lower midrange probably is the weakest sonic attribute of the system. There is just no way to replicate fully with two different topologies (maybe especially at the cross-over point) the oomph of the driver surface area of dynamic drivers chained continuously throughout that frequency range.

Many of us say this -- because it is true -- and it is fine to repeat: yes, we all like the music and we revere the components, but the highest joy for me in this hobby is the camaraderie of the hobby and enjoying the music with friends. Thank you for visiting!

I suspect Kedar has never heard the Beethoven 9th with Chorale live , hence the suggestion to advance to the last bits.

Congrats on finally getting your system and room to its current level Ron , panels are not only very temperamental to room treatments , but are also super response to the smallest of incremental movements making placement of your 4 towers Very difficult not only to the room , but also in relationship to each other.

Regards
 
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panels are not only very temperamental to room treatments , but are also super response to the smallest of incremental movements making placement of your 4 towers Very difficult not only to the room , but also in relationship to each other.

Why do you feel this way? Do you think dipole panels are more temperamental to room treatments than are point source box loudspeakers?

Congrats on finally getting your system and room to its current level Ron

Thank you!
 
I suspect Kedar has never heard the Beethoven 9th with Chorale live , hence the suggestion to advance to the last bits.

No; that was inside joke. A bit too inside as it turned out.
 
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One discrepancy I am finding from your descriptions is your talk about a lower center of gravity and yet the admitted weakness is the lack of umph in the lower mids.

Not a discrepancy; two separate, independent thoughts.
 
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admitted weakness is the lack of umph in the lower mids.

I don't know. That frequency range is the cross-over range of the system, so it is a frequency range which naturally attracts suspicion.

I don't hear on my system the focus on that frequency range that I hear from the videos of Peter's system. But left to my own listening I don't think I would hear any issue.

If Al would like some more oomph in the lower midrange, then I'm sure he's right.
 
Why do you feel this way? Do you think dipole panels are more temperamental to room treatments than are point source box loudspeakers?



Thank you!

Yes they are , point source and line-source speakers are very different in how they interact with the room , then throw in dipole structure and let the games begin ..!


Regards
 
Yes they are , point source and line-source speakers are very different in how they interact with the room , then throw in dipole structure and let the games begin ..!


Regards

Now you are merely saying they are different. I agree they interact with the room differently.
 
I don't know. That frequency range is the cross-over range of the system, so it is a frequency range which naturally attracts suspicion.

I don't hear on my system the focus on that frequency range that I hear from the videos of Peter's system. But left to my own listening I don't think I would hear any issue.

If Al would like some more oomph in the lower midrange, then I'm sure he's right.

Ron, what specific frequency range do you hear as a focus from my videos, and is it across different recordings?

If Al would like to hear more “oomph in the lower midrange” in your system, how does that relate to your concept of “your system’s center of gravity”?
 
Now you are merely saying they are different. I agree they interact with the room differently.

They are different while being more temperamental than monopole’s ..!

Not only to the room but also to the amplification , Electrical phase angles , zmin /max et al ..!


Regards
 
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Hello Amir,

This excerpt is so dogmatic and vague it is almost meaningless.

1) There are many different types of acoustic treatment devices, many different tools for this job. Which particular low frequency acoustic treatment is he talking about?

2) Where does he get his 10% and 300% numbers from? These numbers seem to be made up, especially as he is not talking specifically about a particular acoustic treatment device.

3) The most basic, ubiquitous bass absorber acoustic treatment device is an ASC TubeTrap. Here is the frequency response for the basic TubeTrap:

View attachment 112469


Please tell us how his 10% and 300% figures apply to this device.

4) The PSI AVAA affects frequencies below 100Hz and has no effect effect at 1kHz and above. So the statement is plainly and entirely false with respect to this acoustic treatment device.

In summary, this is a dogmatic, unprofessional and very incomplete (to put it gently) statement.
Ron

What Romy said is upon the subjective hearing experience not objective measurements.
I have the same experience in my room.

I should say the tone damage in mid and high frequency is not just darkening sound and most acoustic panels destroy the tone (harmonics) , simple measurements does not tell you about tone quality.
 
Ron, what specific frequency range do you hear as a focus from my videos

I think I hear either an emphasis in the lower midrange or a de-emphasis in the treble range -- I do not know which it is.

(I go into detail about this in connection with David's Bionors in Post # 1,443, above.)
 
If Al would like to hear more “oomph in the lower midrange” in your system, how does that relate to your concept of “your system’s center of gravity”?

Al's comment tells me that he would like to hear a slightly lower sonic center of gravity.
 
Ron

What Romy said is upon the subjective hearing experience not objective measurements.

Now you are interpreting the excerpt yourself. Even with your interpretation, the points in the excerpt are incomplete and misleading.
 
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I should say the tone damage in mid and high frequency is not just darkening sound and most acoustic panels destroy the tone (harmonics) , simple measurements does not tell you about tone quality.

In my system I am not hearing that the mild absorption above 1000Hz is destroying the tone.

I agree that simple measurements do not tell us about tone quality. But I never suggested that simple measurements tell us anything more than about simple observed energy levels across the audio frequency range.
 
I think I hear either an emphasis in the lower midrange or a de-emphasis in the treble range -- I do not know which it is.

(I go into detail about this in connection with David's Bionors in Post # 1,443, above.)

Thanks Ron. I reread that post to shed light on your comment about my videos, but do not really see the connection. It is an interesting post though. You wrote this:

"I am not trying to maximize naturalness and suspension of disbelief on acoustic instruments. I am trying to maximize naturalness and suspension of disbelief for a vocalist singing to me in my listening room. And for that, to my ears, the openness and transparency of planars gives me more towards believability on vocals than I lose from sacrificing the upper bass/lower midrange sonic center of gravity I enjoy so much, and which I find maximizes naturalness and tonal density and weight, on acoustic instruments."

Are you saying that acoustic instruments and a singer's vocal range cover different frequencies and should be approached differently or are separate goals? Do you have the impression that ddk and I prioritize the sound of acoustic instruments over voices and that our system's sound reflects that preference? Your post #1443 seems to suggest that. Voices have the same frequency range as some instruments. I want voices and all instruments to sound equally convincing on my system. Voices have naturalness and tonal density and weight too, just like acoustic instruments do. I see them as the same challenge.

The comment about a vocalist singing to you in your listening room is also interesting. What if the vocalist is at some acoustic venue such as a night club, a church, or up on stage in a hall somewhere? Do you still want a presentation telling you that he or she is singing to you in your room and not that you are there listening to him or her in the venue where the recording was made? If that is indeed the case, such a goal would likely affect how you treat your listening room. If you prioritize the sound of your room over the ambiance captured on the recording, you would want your room acoustics to overshadow the setting information embedded on the recording. In other words, you would not want your room to disappear, but instead to be clearly audible and to provide the backdrop acoustic for the singer.

Some of the room treatments I tried did indeed move the sound in this general direction. They absorbed much of the subtle, ambient information on the recording and did give me the impression that vocalists were very present in my room. They popped in front of me. It was a very high contrast type of sound with black backgrounds and that solo singer was right there at my fireplace singing for me.
 
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In my system I am not hearing that the mild absorption above 1000Hz is destroying the tone.

I didn't hear that either. In fact, I reported on a harmonic completeness in the presentation that is rarely heard. The orchestral woodwinds alone were incredible in that respect.

Some of the room treatments I tried did indeed move the sound in this general direction. They absorbed much of the subtle, ambient information on the recording and did give me the impression that vocalists were very present in my room. They popped in front of me. It was a very high contrast type of sound with black backgrounds and that solo singer was right there at my fireplace singing for me.

As I wrote in my report, hall information on the recording is very much conveyed in Ron's presentation. There is nothing dry about it.
 

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