Matt, thanks again for the interview and opportunity to discuss some of what I do. To be clear, in the end one must listen, hopefully enjoy. With some luck I will eventually set up some blind/controlled speaker listening sessions for folks to really decide with their ears ;-)

@PoesAcoustics

5 ай бұрын

Always a pleasure AJ and I hope you do.

@KING_DRANZER

5 ай бұрын

I agree with you on majority of the stuff you said. Awesome information laid down for us. But man speakers in a surround config in a well treated room can be made to output sound so enveloping with even the depth of field that one be hard to point out that sound is coming from a specific source. Like KEF theater setup those got the most depth of field and enveloping effect I ever heard to. The speakers at that point just disappear and sound just simply envelops us.

@ajsoundfield9652

5 ай бұрын

We agree 🙂. @@KING_DRANZER At around 17:50 I explain that for 2ch stereo music (99.9% of music recordings for decades), this type of discrete MCH speaker arrangement is not necessarily optimal...for 2ch upmixing etc. and treatments for discrete MCH is fine

@howardskeivys4184

5 ай бұрын

Please A J read the comments I left under the video. Basically, you almost perfectly echoed my own convictions.

@ajsoundfield9652

5 ай бұрын

Thanks Howard, read your post. Just to be clear, I also try to make attributions for the science I use, everything I am speaking about related to "science", is as the result of control blind listening tests via AES. There are papers for every aspect of what I discuss, way too long to list here. This is the opposite of merely citing opinions.@@howardskeivys4184

I’m not an acoustician, neither am I a loudspeaker designer or engineer. I am however very well grounded in the sciences, particularly, physics. I’m also blessed with a scientific and logical brain. I also have over 40 years of attentive listening to music experience and have allowed my 2 channel hifi system to evolve over that time. Have ignored good advice and heeded bad advice. Ive learned from my mistakes. This video proved so fascinating that I watched it 3 times in succession. A j’s words mirrored almost exactly my own thoughts and personal conclusions. A few quotes from the video, if I may? “You’ll see almost no treatment in my rooms”! I have never been an advocate of room treatment. Whatever room I’ve set up my hifi in, it is unquestionably the hifi that has dictated the characteristics of the sonic picture, not the room. “I firmly believe that the loudspeakers should treat the room and not the room be treated for the loudspeaker’s inadequacy”! Brilliantly expressed. If your speakers, backed up by the rest of your gear, are doing their right? The need for acoustic correction is negated. “You speak the language that I want my audience to understand”. Well, this member of the audience, understood a J’s language, perfectly! Great content. Can’t wait to see more of it. I think that with hifi, quite often, costly solutions are manufactured to solve trivial or even insignificant issues. Most of all, enjoy the music.

Excellent stuff. I like the nuanced approach and I recognize the reasoning, and the studies upon which it's based. Soundfield Audio makes interesting products that seem oriented to not only measurement based development but also expanding choice how the product is used. Flexibility. I like your interviewing, too, letting AJ speak and clarify his approach and then augmenting with your perspective. Thanks for posting this.

@PoesAcoustics

5 ай бұрын

Thanks for the compliments. I think AJ is a smart guy and I like that his approach to sound is grounded in psychoacoustic research and not just the basic engineering principles many know. Many of the things he focuses on are ignored by others and arguably to their detriment.

Verry interesting approach. Food for thought.

Great discussion! Very interesting and enlightening

Hi Mathew . I absolutely luv your channel. My questions is off topic but it’s in relation to your 2nd part livestream with Shane concerning insulation products. I recently purchased some Umiaccoustic panels from Amazon. I want to further darken my walls closest to my screen wall and I saw this product reviewed on AV Nirvana. They are 4 x 2 polyester panels. They appear to be quite safe after my research and they are only .4 inches thick. They do have a fire retardant coating built into them which I think most panels do. I just wanted to get your opinion on the safety of this product before I hang them. Thanks again

This guy is insane. Loved seeing this video and information. Very enlightening. Thanks.

Danny Richie from GR Research has been developing speakers with a scientific based approach for many years. Would be great to see Matthew interview Danny.

@user-br2vc3sz9h

5 ай бұрын

🤣

@PoesAcoustics

5 ай бұрын

I wouldn’t hold your breath. I don’t think we see eye to eye on what is science there.

@njrumenos

5 ай бұрын

@@PoesAcoustics I’m confused, what is it then?

@njrumenos

5 ай бұрын

@@PoesAcousticsmost of what this guy in your video is explaining is exactly what Danny has been developing for many years, so I’m very confused 🫤

@williamkramer9069

5 ай бұрын

No. 😂

Measurements are important to help work more efficiently

I.e like a Kii 3 or Dutch& Dutch. both of which are active cartiod speakers.

@PoesAcoustics

5 ай бұрын

Sure those are great speakers too. These are also fully active.

Holy crap this was refreshing. It was a new take without throwing the baby out with the bath water. The second he said he doesn't like treatment I almost lost it. It's the single most overlooked component of a system these days. Dudes with these 100K systems and zero treatment in their bay windowed, tiled floored beautiful homes. It hurts my audio soul! But.....then he also talked about cardioid and reverb time. I completely loved having no treatment for 2 channel because the reflections AND out of phase sounds made it sound like it was surround sound. Truly amazing. I love that you guys differentiated between two channel and Atmos because I think that gets neglected. I recently went from 5.2.1 to 7.1 and am missing that enveloping height channel separation. At the same time I think you need at least a .4 system to really enjoy it. I am very happy with my bed layer system 7.1 now and also have come to the conclusion that when you have surround sound you want the speaker to take place of those early reflections. Not only that....they are spreading sound in so many different directions and bouncing off of so many different walls, you NEED to have lots of absorption so as not to overwhelm the listening spot with "reflections" from the speakers and reflections from the walls. I really want to look more into cardiod bass and I still want you to address questions of poor bass decay and multisub. I think I get cleaner bass from a single sub than the 4 I had. The four subs (all corners) could dig deaper and get a flatter FR response without eq but decay was much much longer and therefore not as clean and precise. Please do some measurements with single or dual vs 4 subs and show decay times. the four subs did shake the entire house and listening position which was amazing for movies but too much for music even with the same measured frequency response. What gives there. Please enlighten. Keep sharing my man!

@PoesAcoustics

5 ай бұрын

I can certainly do some experiments to help show this, but...there is no reason for four subwoofers that are time aligned and setup correctly to increase decay time. Assuming a response shape and level matched system with accurate integration and time alignment, the bass would decay the same. The room would dominate that in fact. Setting up multiple subwoofers is really not trivial, it's exponentially more difficult than a single subwoofer, and I think that contributes to a lot of the negativity around subwoofers. Even the negativity toward a single subwoofer, I believe, is because of poor setup and integration and not an inherent problem with subwoofers. The reality is that a subwoofer is a perfect bass reproduction device, if you look at the subwoofer as a system for producing bass, compare that to a speaker, there is no doubt that the subwoofer is more optimized for that job. Yet commonly audiophiles discuss the benefits of full range speakers, which places bass sources in sub-optimal locations and those sources are underpowered and significantly weaker. It can't be that the subwoofer is a worse bass reproduction system, that is factually wrong, so it must then be that it isn't setup right, and if setup correctly, would in fact give better sound. Which is what I have experienced. Similarly, the problems with a single subwoofer is well known, so if it is sounding superior to multiples, it isn't likely to be one vs four. It's more likely to be either differences in the subs themselves or setup issues.

@NakeanWickliff

5 ай бұрын

@@PoesAcoustics I may have to revisit. I had 3 sb2000 and a 15 sealed diy sub for a while with mini dsp. I might try again with impulse response measurements and time align the way I aligned my active three way. I time aligned by FR for the flattest response last time.

@NakeanWickliff

5 ай бұрын

@@PoesAcoustics I do not believe in full range even though I run open baffles with 2 15 subs each. I like overhead though.

@PoesAcoustics

5 ай бұрын

@@NakeanWickliff time aligning by impulse can be tricky. Because a subwoofer is bandwidth limited, the impulse is much longer. The initial peak is broader and not as sharp. That makes precise alignment tricky. A better approach is to use phase alignment mixed with a wavelet. Wavelets let you examine the peak energy time and push the subwoofer such that it is better aligned with the main speakers. This is a concept that is catching on with others so I probably need to give some love to it in a video.

@NakeanWickliff

5 ай бұрын

yes please! Any other info on this method? I want to try again with mulit sub before I let these other 3 sb2000's go. @@PoesAcoustics

First reflections are similar to SBIR in that it causes interference aka “comb filtering”. I think I’ll leave my first reflections treated

@PoesAcoustics

5 ай бұрын

It's your system and you should do what you think is best for you. However, this really isn't what the science tells us about reflections off the sidewall. Lateral reflections are not creating detrimental combfiltering, they are providing the brain with cues that give us the perception of envelopment, increase appratent source width, as well as create reflections that help drown out the comb filtering. It was actually found that combfiltering wasn't audible in reflective rooms, but was quite audible in anechoic chambers. Selectively absorbing critical reflections is creating a detriment to the sound, not an enhancement. That is what AJ was discussing and what I believe as well.

@dougleydorite

4 ай бұрын

@@PoesAcoustics do you think the same is true even in a spall room, where the side walls are only 6 feet away?

@PoesAcoustics

4 ай бұрын

@@dougleydorite Yes it would still be true at 6 feet. Where it might be more of an issue is if the speaker is right next to the walls and we only have maybe 1 foot between the speaker and wall. Even then, the interference it creates wouldn't be that problematic. On the other hand, the image widening effect of the lateral reflections would be quite great.

@dougleydorite

4 ай бұрын

@@PoesAcoustics interesting. Have you ever considered getting involved in the world of recording, speakers and acoustics? HiFi audio and Pro Audio has always clashed, but more and more, people are joining forces because of the measurements and technology provides proof and corrections, respectively. I’ve learned a lot from folks like yourself and Erin’s audio Corner

@PoesAcoustics

4 ай бұрын

@@dougleydorite I am not sure what you are saying. Have you looked at what I do? I am an acoustic consultant. I have helped design speakers before. Making a good speaker is easier said than done. Not sure I want to move too heavily into that direction. I do a lot of work in acoustic design. I engineer rooms. I have engineered recording studios. That’s a service I offer. I have quite a good reputation in the industry overall. I work with and surround myself with many of the top people and they all think highly of me and what I bring to the table.

" I never listen to my speakers ". Could the reason for that be because they sound so bad ?

@PoesAcoustics

5 ай бұрын

That isn’t a quote from AJ. What he said was he doesn’t listen during the initial crossover design. He builds it’s so it measures well and then listens. AJ needs to speak for himself but I would be surprised if he doesn’t make tweaks after the fact. Sometimes small tweaks yield notable improvements but the relative benefit to the measurements is small enough it can be missed during the initial development.

@PoesAcoustics

4 ай бұрын

@JohnSmith-xo7jk yes I understand. Look at AJs comment that he added. I think he got caught up on the interview and overstated his own approach. It isn’t that he doesn’t listen. It’s that he can develop it totally with measurments and be confident it will sound good having never heard it. Which is true. But you still need to eventually listen. And in my opinion and experience, you may hear things you want to tweak. I assume AJ does this but can’t speak for him. Dan Roemer very much designs with a scientific approach. He starts with measurements and does most of the core design work in simulation. At some point you have to listen. He told me that with the S7T LE they went through something like 50 prototype iterations before landing on the final product.