Room acousics & Interaction with speakers (from Harman)

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Room acousics & Interaction with speakers (from Harman)

Postby Dan Nelson » Wed Mar 10, 2004 5:05 am

Room acousics & Interaction with speakers - VERY GOOD


VERY GOOD: Loudspeakers and Rooms for Multichannel Audio Reproduction - Feb 2002
This 74 page, three-part article is a compendium of lectures given at various teaching and training sessions. It takes the form of PowerPoint slides illustrations accompanied by text explanations. Although primarily aimed at multichannel applications, most of the theory applies equally to stereo systems.

    Part 1: How many loudspeakers? What kind? Where do we put them? - Feb 12 2002 - 15 pages
    The basic history and theory of multichannel sound is used to help understand how many channels and loudspeakers are necessary, what kinds of loudspeakers work best in different applications, where to place them in a room, and the effects of adjacent room boundaries on sound quality. There is discussion of how careless placement and use of audio cabinetry can spoil the sound of a good loudspeaker. Finally, we take a look at in-wall and in-ceiling loudspeaker options.
    http://www.harman.com/wp/pdf/Loudspeakers&RoomsPt1.pdf


    Part 2: Making a good loudspeaker - imaging, space and great sound in rooms. - Feb 11 2002 - 26 pages
    This section begins with an explanation of the "circle of confusion" that pervades the audio industry, showing how important loudspeakers are in the preservation of audio artistry. However, loudspeakers are technical devices, and engineers need the appropriate science to design them properly. The situation is complicated by the fact that we listen in rooms, all of which are different, and all of which influence what we hear from the loudspeakers. There is a discussion of some of the important measured parameters of loudspeakers, and how it is possible to design loudspeakers in ways that makes them inherently more "room friendly" - having the potential of sounding good in a variety of different room settings.
    http://www.harman.com/wp/pdf/Loudspeakers&RoomsPt2.pdf


    Part 3: Getting the bass right! - Feb 10 2002 - 33 pages
    We all dream of having deep, powerful, tight, articulate bass, but amazingly few ever achieve it. Some audiophiles gave up trying, and reverted to small speakers, thus avoiding annoying bass boom, but also abandoning the low fundamental notes of the music. There are several problems, and most of them have nothing to do with the loudspeaker. The room, and the arrangement of loudspeakers and listeners within it, dominate what we hear. It is a problem that cannot be completely solved by good loudspeaker design, or by electronic equalization, although both of these can help. A complete solution requires the input of somebody who understands the fundamentals of room acoustics. We don't yet have all the answers, but you may be surprised how much is utterly and easily predictable.
    http://www.harman.com/wp/pdf/Loudspeakers&RoomsPt3.pdf



AUDIO-SCIENCE IN THE SERVICE OF ART - Feb 5 2002 - 23 pages
Music and movies are art. The audio equipment and techniques, used in capturing, storing and reproducing this art, are developed using scientific principles and engineering methodologies. The audio industry is truly an example of science in the service of audible artistry. We have come a long way towards our goal of perfection, and almost all of the consequential progress has been the result of improvements in our knowledge of physical principles, measurements, and our understanding of the psychoacoustical rules that relate what we measure to what we hear.
http://www.harman.com/wp/pdf/AudioScience.pdf


AUDIO-SCIENCE IN THE SERVICE OF ART - Feb 5 2002 - 23 pages
Identical paper but MS Word document
http://www.harman.com/wp/pdf/AudioScience.doc


Loudspeakers and Rooms - Working Together - Dec 2 1999 - 20 pages
The paper "Maximizing Loudspeaker Performance in Rooms" sets the stage for this one. Here we get down to the nuts and bolts of what is going on in rooms: standing waves, reflections, diffusion, and dimensional ratios. In the complex interaction of loudspeakers and rooms, most of us end up with audible problems in the bass region. Eventually we get tired of whatever it is, and look for solutions. In most cases, the problem is not with the woofer or subwoofer, it is in how it, or they, interact with the room.
http://www.harman.com/wp/pdf/Loudspeake ... gether.pdf


Maximizing Loudspeaker Performance in Rooms - Dec 4 1999 - 24 pages
Why do loudspeakers sound the way they do? What makes a good loudspeaker? How can we get more and better sounding bass in our rooms? These are key questions for all audiophiles. It turns out that there are some things that can only be done by the loudspeaker manufacturer. If he fails, there is little or nothing that can be done in the home, to make things better. In contrast, there are some things that can only be done after you get the loudspeakers installed in your room.
http://www.harman.com/wp/pdf/MaximizingLoudspeaker.pdf
Dan Nelson
 
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