*Driver Heat Dissipation Thread* |
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neilpoints
Young Croc Joined: 03 March 2010 Location: Cornwall Status: Offline Points: 976 |
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Please can you tell me about other alloy drivers from the past? < id="gwProxy" ="">< ="jsCall;" id="jsProxy" =""> |
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former Eurovision contestant
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S DeXter
Young Croc Joined: 12 May 2008 Location: Moon Status: Offline Points: 1268 |
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That is true for certain enclosures, it really depends on what type.... I have seen a few small sealed rear chamber drivers suffer from extreme effects of heat with no cone stress / failure. I remember opening an F218 up and the whole coil had unwound off the former into a big bundle of tumbleweed in the back of the chamber..... but the cone was fine.... Yes if you keep increasing coil cooling eventually the next thing to break will be the suspension/cone. |
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Enjoy your self...... It's later than you think.......
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Meat
Old Croc Joined: 05 June 2009 Location: Manc Status: Offline Points: 1514 |
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Anyone got any links to moving magnet transducer designs? Someone must have done it, probably back in the days when everything was untested and new probably.
In terms of phono carts the moving coil is the less sensitive of the two designs... Anyone ever done multiple concentric coils or coil arrays in the motor? |
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rich_gale
Old Croc Joined: 18 February 2008 Status: Offline Points: 2697 |
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i see heatsinking as a way of limiting the electrical power required by lowering the power compression. and less of an attempt to increase power handling. lets assume a pd1850 loaded scoop is kicking out 130db at its 800w rated power. imagine you could gain 0.5db or 1.0db on top of that, per cabinet, using exactly the same power input. id imagine it would make a huge difference to the listener once cabinets are in multiples. that would be like the difference between giving the driver 800w and giving it 1000w. or with 5 cabinets you are looking at a difference of it sounding 1kw worth of amps louder. |
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REFLEX ALL THE WAY.... (however, im playing with horns again...) That ok Mister Valiant? :)
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S DeXter
Young Croc Joined: 12 May 2008 Location: Moon Status: Offline Points: 1268 |
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Moving magnets would add large weight to the diaphragm and reduce efficiency somewhat. Radial coiled electromagnets have been talked of before instead of permanent magnets (to increase BL), there is a patent somewhere. I think cone strength vs weight will always be a major issue... |
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Enjoy your self...... It's later than you think.......
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S DeXter
Young Croc Joined: 12 May 2008 Location: Moon Status: Offline Points: 1268 |
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Yes chamber heatsinking most certainly is. |
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Enjoy your self...... It's later than you think.......
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madboffin
Old Croc Joined: 03 July 2009 Location: Milton Keynes Status: Offline Points: 1537 |
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I'm sure I have seen some Throne Shakers which used fixed coils and moving magnets. For really high powered low frequency drivers, take a look at the designs used in shakers for vibration testing. Big moving coils and specialised suspensions. There must be some inspiration, and perhaps technology transfer, to be had there. |
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nineleaves
Young Croc Joined: 31 August 2007 Status: Offline Points: 1327 |
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Grooans.. im staying out of this.. so much facepalm :/
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