![]() As successful as these dark brown plastic films were for most hi-fi voice coils, they also had some less attractive properties, principally their cost, and an unfortunate tendency to soften when hot. In 1955 DuPont developed Kapton, a polyimide plastic film which did not suffer from aluminium's deficiencies, so Kapton, and later Kaneka Apical were widely adopted for voice coils. Motion of the aluminium bobbin in the magnetic gap creates eddy currents within the material, which further increase the temperature, hindering long-term survival. It rather efficiently but inconveniently transfers heat from the voice coil into the adhesive bonds of the loudspeaker, thermally degrading or even burning them. When higher power amplifiers emerged, especially in professional sound, the limitations of aluminium were exposed. "Aluminium was widely used in the speaker industry due to its low cost, ease of bonding, and structural strength. Here is a section from Wikipedia on the subject: it may be that this was caused by the occurring eddy currents? Snug Music wrote:I once wound a coil of aluminum, but there did not make slot, this quickly became hot coil. For example, how is it that the magnetic force is omnipresent within the bobbin and through to the pushrod/feedback bobbin? How is possible that the situation is "directly coupled"? Is not that the force of the magnetic field is localized to the area of the drive coil and 'later' transferred through the medium? This is science, not religionĪnyway, I'm very willing to take your statements as truth, Todd, but up to this point you are saying stuff as truth where my understanding would benefit from evidence/disambiguation. I'm not looking to 'believe', I'm looking to know. You can rest assured that Physicists would agree with me. Do I have this right?īahndahn wrote:Please, engineers or physicians out there, clear this up for me. Please, engineers or physicians out there, clear this up for me. The fact that we are burning down the street together is the LOWEST frequency measurement in the motion system, almost unrelated to the level we are discussing. Each material twisting and binding on the micro MICROscopic level producing 'lag'. This would happen in the car too, force from the motor would travel down the drive shaft at the rate of energy transfer of the drive shaft-material, into the transmission, axel, tires coupled with the road, etc. Freakin fast as ever, yes, but its still a propagation in this way. I thought there was no such thing as direct coupling! As far as I am understanding this: of course we are dealing with wave propagation the coil provides the force and that force travels through the glue, into the bobbin, up the push rod etc. There is space between all of the particles, mannn. We are talking about objects in motion under forces which are directly coupled. Opcode66 wrote:We aren't talking about wave propagation here.
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