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    The Lost Art of Loudspeaker Design
    The Lost Art of Loudspeaker Design
    The Lost Art of Loudspeaker Design
    Ebook94 pages51 minutes

    The Lost Art of Loudspeaker Design

    By Michael MacLeod

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    About this ebook

    Loudspeaker design, another example of how the myths of the internet have overtaken this hobby and created some exaggerated claims.
    A practical step by step design and construction manual with free software on building a ducted phase inverter or bass reflex speaker.

    What is High Fidelity? It is the ability to re-create the sound that the recording engineer spent half the night trying to perfect and is not a 5 in 1 surround sound movie theater system with the bass cranked to maximum. I firmly believe that the art of loudspeaker design has passed from the engineer to the accountant, who is intent on the bottom line only - the dollar. It is a mass market where quantity rules not quality. So, if you are one of those people seeking the ultimate sound and who would be proud to say, “I built ‘em”, read on. If on the other hand you want to learn about loudspeakers or just want to tweak your existing set, then this is an excellent reference to have. Includes crossover building, coil winding, speaker testing and much more. Plus free software.

    LanguageEnglish
    PublisherMichael MacLeod
    Release dateDec 23, 2020
    ISBN9780463493434
    The Lost Art of Loudspeaker Design
    Author

    Michael MacLeod

    Michael MacLeod was born and educated in Benoni, South Africa. After completing his military training as an infantry soldier at the 2nd South African Infantry Battalion in the deserts of Walvis Bay, Namibia and seeing action in the ‘Border War’, he became an aircraft maintenance engineer and worked for one of the world’s leading international airlines before retiring. He has travelled South Africa extensively. Among his other interests are designing and building of aircraft, electronics, clock making, woodworking and is also a part time inventor.

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      Book preview

      The Lost Art of Loudspeaker Design - Michael MacLeod

      Chapter1 

      In the beginning......

      I love live music and go to a lot of music festivals. Nothing beats that live vibe and it is always disappointing going home and listening to the ol’ hi-fi afterwards. So when I sat down to design my own speakers, the first goal on my list was that the sound had to be as true to live sound as possible. There is nothing worse than symbols or drums sounding as though they were locked away in a cupboard. If someone clanged a symbol next to you, your ears would drop off, or when a bass drum is hit you feel the air vibrate and that is what I wanted! Secondly, the boxes or bins as some would call them, had to be reasonably sized. In other words they weren’t to take up half of the lounge! 

         I’ve always been fascinated by the pyramids and their so-called mysterious powers. While messing around on a notepad one day, I found a unique ratio to them, which allowed me to find a way of dimensioning speaker boxes so that odd harmonics would not colour the sound and which allows good bass response from reasonably small speaker cabinets. I call this the GOLDEN PYRAMIDAL RATIO, or the ‘GP’ ratio for short. 

      Start off by drawing a horizontal line on a pad, say about 80 mm long. Take a drawing compass centred on this line and using a radius of about 30mm draw a circle. Now draw a line perpendicular to the first through the centre point till it bisects the circle. See figure 1. Label the four points on the circle ABCD starting from the l\h side or 9 'o clock position. Draw two lines from the top of the vertical line at point B down either side to A and C. You should now have a pyramid in the upper half of the circle. Mirror the pyramid in the bottom half as you did in the upper half. Take the compass again and keeping the original dimension of the circle (do not disturb this setting at all), draw an arc on side AB using point B as the centre and label this as E. Do the same on side CD on the lower pyramid using point C as the centre and label as F.  Join the two arcs EF with a line which is parallel to BC. Rotate the page 45 degrees and you will see your speaker box. If you now divide the height BC by the width EB you get the figure of 1.4142. This is your GP ratio. Notice how the line EF that you have just drawn bisects the horizontal line AC, label this point as G. Using the compass centred at F, you will note that an arc cuts point G exactly, if you haven’t disturbed the original setting of the compass, that is. Using point C as the centre, draw an arc on BC and label as H. Draw a line between GH and you now have a narrow rectangular box in the upper half of your speaker. This is where the tweeter and midrange speakers are housed. The lower half of the speaker cabinet is perfectly square and is where the woofer fits. See the perfect 3d view of the speaker overleaf. 

      This then is how the correct dimensioning is obtained. The GP ratio can be expressed mathematically as:  

      laold3

      The drawing we have made is my logo.  

      laold2

      Fig1

      Loudspeaker types.

      Let’s have a look at the types of speaker and their construction. The main speaker is the woofer or bass speaker, some people call them drivers, but that’s up to you. Woofers are all basically the same, the main difference being the material used to join the paper cone to the metal frame and is called the surround. There are four materials used, namely: paper (older types), cloth (including reinforced), foam and rubber, the first two are used mainly by musicians. The foam type is used in domestic hi-fi systems, as it has a smoother response and gives good bass reproduction. A newer type of speaker has a cone made from polypropylene, but I prefer the paper cone for it's all round performance as the polypropylene ones are too stiff and are more suited to car sound systems where they can handle sun

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