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  1. B

    Post your Horn pics

    RTx measurements are only valid for large rooms like concert halls etc. But even there, at many locations, it's not.
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    Post your Horn pics

    Nice, but an RT60 measurement is invalid in such a small room as it doesn't have a diffuse soundfield. That's one of the biggest myths still alive in acoustics. Those who are experts in small room acoustics know this well.
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    Post your Horn pics

    Is that RPG Expo on the walls?
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    Best Acoustic Products for First Reflection Points

    The better treatment depends on areas like distance (time of flight) and that acoustic principle one is following. However, there are some areas which are important to consider when treating early arriving reflections which I've pointed out to some degree here...
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    Why do many Acousticians recommend absorption for non-bass freq: Valid OR prefer dead room & Dogma?

    Many areas that come into play here. Especially the size of the room and distance from ears to the surfaces. Diffusion lower in frequency requires distance. Which in many cases aren't met in several small rooms. Using primarily high frequency diffusion will only treat part of the specular...
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    What amp/ preamp combo has the most Gorgeous, Lifelike Tonality?

    Near field monitors? Nothing of what I mentioned implies near field monitors.
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    What amp/ preamp combo has the most Gorgeous, Lifelike Tonality?

    Isn't this in reality yesterdays hifi approach? Today we have both EQ and EQ plugins (like valve sound) that can alter the sound the way you want it. This can be implemented by pressing a button and remove it the same way. Why lock oneself to one tonality or distortion and also pay a lot of...
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    What amp/ preamp combo has the most Gorgeous, Lifelike Tonality?

    While there may be some euphoric distortion that generally sound pleasant; the sound from the speakers and the room (acoustics) contribute so much to the overall result that what one person experience has little relevance for others.
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    Bass traps. Advice wanted.

    EQ works well in the response which is minimum phase. However, even if the 69 Hz resonance should be minimum phase behavior using only EQ is a compromise compared to remove it with physical treatment. With acoustic treatment you don't loose any dynamics. The important thing is to first move out...
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    What are the biggest audio shows in USA?

    Hi guys. What are the biggest and considered the best audio shows in the States? I understand "best" can be subjective, but I'm mainly thinking in lines of quality of rooms (acoustics) and number of exhibitors.
  11. B

    Can I fix a room decay of 1500ms?

    The frequency response is a derivative of the time domain. So to say that the time domain doesn't matter is like saying the earth is flat. He couldn't be more mistaken. Every knowledgeably acoustician works primarily with the time domain in the room. The frequency response will follow. Your...
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    Can I fix a room decay of 1500ms?

    It can be minimum phase. Wow! No pun intended, but if that's general statement on the time domain in the room it's very wrong and you must have misunderstood something. That would imply that decades of psychoacoustic researchers were a waste.
  13. B

    Can I fix a room decay of 1500ms?

    If one only cares about frequency response, DSP or multiple subs will work well. However, the time domain is equally if not more important. And in order to achieve a great time domain in the bass, physical treatment is necessary. DSP/room correction will actually introduce phase wraps where...
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    Can I fix a room decay of 1500ms?

    Why not contact RPG in Kent, which are close to you. They have bass traps that are both effective at low frequencies and quite broadband. Sure, they aren't cheap as porous material but it's an investment for life. http://www.rpgeurope.com/ The room should be measured first to find the right...
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    Post your Horn pics

    Thanks. This is a prototype and simply painted. Using thick plywood and constrained layer damping in rear chamber. It should be dead.
  16. B

    Post your Horn pics

    Here's a midbass horn we're working on.
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    SMT Wing Diffusors vs. QRD Diffusors? Effective?

    I have both seen them and heard the result in many rooms. And after that I've even more convinced that they are not diffusers but simple scattering units without an even distribution and where the result is frequencies that sticks out in a negative way. That's what both I'm hearing and my...
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    Don Keele on Constant Beam Transducer (CBT) Speakers and then some

    With a linear phase crossover, the CBT gives square wave response. Perhaps not perfect square waves but pretty close. Don has a paper on this: http://www.aes.org/e-lib/browse.cfm?elib=17944
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    SMT Wing Diffusors vs. QRD Diffusors? Effective?

    Though I sell acoustic products, there are a few things worth mentioning. Common diffusers are based on BEM simulations and this is widely recognized in the industry. The SMT diffusers do not use BEM simulations but CATT simulations. No one else in the industry, at least that I'm aware of...
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    Anyone hear the new Wilson Audio Sabrinas?

    I listened to them at the Copenhagen show. The sound there was ok. Not among the best, nor among the worst.
  21. B

    Diffusers?

    RPG has a product called Pyramid & Silent Pyramid that looks similar. We sell RPG products to scandinavian countries. However, there are far better diffusers than these. These are mostly scattering units.
  22. B

    RPG Modex Plates-"Free" Bass Traps

    Modex Broadband would be better, but the absorption stops around 5KHz. So there would still be some high frequency specular reflections. Absorbents in front of Modex Plate (type 1) don't need to be very thick though, considering the Modex Plate absorbs well up to around 300 Hz. I've done this...
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    RPG Modex Plates-"Free" Bass Traps

    Just came over this thread. I sell RPG products in Europe. Diffusers need space between the listener and the units to work well. The general rule is that the distance should be minimum 3 wavelengths of the diffused energy. That means if the QRD diffuses down to 500 Hz, the wavelength is...
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    Any thoughts on Verity Audio Lohengrin II

    Tell me MylesBAstor, where does these so called high-end companies publish a polar response? I haven't seen one on their websites. Read: Published So where are they? Please show me so you can refute what I'm actually saying and not a misinterpreation of what I said. Why does it matter whether...
  25. B

    Any thoughts on Verity Audio Lohengrin II

    @MylesBAstor Why are you twisting my words? Did I say high-end companies never conducted measurement for a polar? No. I said so called "high-end" brands never published one. That excludes of course true high-end and it's related to what's published. Of course they can do a polar if they have...
  26. B

    Any thoughts on Verity Audio Lohengrin II

    It's well know from researches that speakers that are correct and with a well behaved power response are preferrred. But of course that's when testet blindly. Sighted tests don't always speak the truth and bias come into place. A polar response is seldom published and never by these so called...
  27. B

    Any thoughts on Verity Audio Lohengrin II

    Firstly; A speaker and a room can't be separated. In order to achieve an even response (not flat!) in small rooms like we're talking about you need both speakers that have a good power response, work on placement in the room, do acoustic treatment and in most cases separate subwoofers is needed...
  28. B

    Any thoughts on Verity Audio Lohengrin II

    Speakers that measures very unevenly will never sound good with a variety of music IMO. They may impress you at the first. But in the long run they will end up favoring some type of music which one easily gets bored of and not come close to a speaker that meausures correctly. I've heard enough...
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    Any thoughts on Verity Audio Lohengrin II

    Looking at how other Verity speakers measures (Stereophile reviews) I would advice you to stay far away. Even some PSB speakers, which are very well designed, should blow them away. At least if people listen blindly....

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