maxg Posted June 18, 2001 Share Posted June 18, 2001 A friend of mine has decided to build his own speakers. The target is to build a set of bookshelf speakers on a par with the Heresy 2's I have (or better - so much optimism) with more bass (27 Hz cut off). Anyway he is off building boxes and whatnot and talking unintelligibly about drivers, crossovers and the like. Who knows what it will sound like in the end but it keeps him happy in the meantime. During the process I asked a question which has been on my mind for a while. Why are most speakers box shaped? I cannot imagine this is the optimum shape for a speaker (presumably Norh agrees with me). Anyway my idea was to take a single tree stump about 50 cm (19.5") in diameter and 1 metre (39") high. Cut the thing in half for 2 speakers and hollow out in each 3 separate comparments as follows: Thickness of wood to be retained 2cm (3/4") all round. Section 1 : For tweeter (horn of course) 15 litres volume required, therefore 10 cm high. Section 2 : For Midrange horn - 15 litres volume, therefore again 10 cm high. Section 3 : 24 cm remaining space for the woofer, or, about 39 litres of air. This should be enough for a 12 inch woofer in a sealed (not base reflex) setup. This leaves a 2 cm top and bottom with similar between each section to ensure proper isolation. Internally there will be no corners as each space is cylindrical (and curved up to the sidewalls if I can). Questions: 1. Anyone care to guess what this would sound like? 2. Would I need any further insulation between tweeter / mid / woofer? 3. Would I need any sound absorbing materials inside at all? 4. How come no-one else is doing this? 5. Am I barking mad? 6. Presumably no 2 speakers would sound exactly the same and all would be influenced by the choice of wood. Do you think that could be a marketing angle? 7. Do I have too much time on my hands? Quote Link to comment Share on other sites More sharing options...
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