Dedicated Thread for Subwoofer Knowldge -

[Beat_Dominator 5,000+ posts]

The Titanium former in my Diamond M6 was sweet.

 

[osix 10+ year member]

It would be Great if you can Support your Info wiith Graphic , Photo , or Url link .

This way . is will slowly grow into a Database of Subwoofer anatomy //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Many Thanks to those who had reply and posted . //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[osix 10+ year member]

Voice core can be also build using ,

paper , kapton , mylar, aluminum , copper , silver ,Titanium or fiberglass, even ceramic .

anyone can touch on this more ? or any other related topic

 

[PESteele 10+ year member]

that vid was very informative. I would like to know more about cooling.

 

[HannaS10 10+ year member]

That was an interesting vid.

 

[btlking 10+ year member]

Discovery Channel "How It's Made"http://www.realmofexcursion.com/videos/Various/loudspeaker.wmv

good call on the video tyler very informative

 

[osix 10+ year member]

Correct me if i am wrong ,

heat is produce during movement of the voice coil .

thus special glue is use to endure the heat . - usually Vents is drill to allow air onto the voice coil section to cool it down . which some in the industry call it air cool or air flow .

The dust cap movement itself is a form of cooling . as every motion will create flowing air . in return cooling the voice coil .

- some design even go to extent to have liquid metal in the voicecoil to help cool it down .

and of cos the force from the action itself plus alot of vent or drill hole can also act as cooling for the sub itself .

feel free to correct me if i am wrong or you can add more info to it .

 

[Patrick Simmons 10+ year member]

Nice video and great thread as well. This should be an interesting discussion.

 

[jimrhit 10+ year member]

The dustcap is both for cone strength/breakup taming as well as a seal to force air back down through the gap to cool the coil.

The steel plate and pole themselves are also heatscapes for the excess heat from the voice coil, so a moving coil (air movement aside) is better cooled than a static coil. The steel is not very quick to absorb heat, so many manufacturers add aluminum plates/vanes to aid in the cooling.

As said before too, an Aluminum former is a very efficient method of VC cooiling too. This design, when thermally coupled with an Aluminum cone (think Pioneer VCCS) can increase power handing twofold in certain cases.

Vent holes in the former and in the spider can be used in a few ways ... they can aid in cooling by allowing for more air flow ... and they can also slow down airflow/compression so that the mechanial compliance is more symmetrical in both directions, since forced air cooling can sometimes add too much distortion into the mix, so you have to sacrafice power handling for sound quality.

 

[osix 10+ year member]

There are also some that use Liquid cool . which add a tube of liquid on the inner part of the T-Yoke -but is not commonly used .

the T-Yoke and the Pole act like a heatsink . to pull heat away from the VoiceCoil

but also the Washer ( Top plate ) is also offen drill with vent or holes to help Ventilation

Different type of Former for the Voice coil can also act as Heat conduct to help cool down the Voicecoil .

nano technological product which had some company making ceramic coated stuff and other mix compound .

but does not alway give you better Sound or loudness. - it all depend what you need in your subwoofer.

 

[jimrhit 10+ year member]

The steel parts of the motor do act as heatsink, however, the are 4 times less thermally conductive as Aluminum....hence the use of Aluminum fins and such for cooling purposes.

Al can simultaneously act as a shorting ring in a motor (it needs to be quite large in subwoofers .. ~3x larger than a copper one) ... so you can double dip on this ... you get better power handling as well as lower distortion

 

[osix 10+ year member]

Aluminum had been a good choice for former ( voice coil )

for a few reason , Cost is relatively low , and is light , and is also stronger then Paper and kapton

Alot of major brand is using it .

To add to some info on Cooling . and touching on Voice coil

here a Quote from WIKI - attach with a link right below

Voice coil cooling occurs by several means: conversion of electrical energy to mechanical energy (conversion efficiency), forced air cooling and blackbody radiation. The diameter of the coil also determines, to a degree, its power handling capacity. Modern voice coil technology employs high temperature dielectric materials to withstand operating temperatures up to 500ºF in professional sound reinforcement installations. One manufacturer uses anodized aluminium flat wire, which is effectively insulated against shorting between turns of the coil, but which is not subject to dielectric breakdown as is the case with various enamel coatings used on most voice coils. One of the leading failures of voice coils is breakdown of the enamel coating of the windings due to excessive heating, which causes the coil to "fracture", producing a rupture in the windings as the adhesive qualities of the enamel are lost and the coil literally becomes unwound in portions of its length. This is the most common voice coil failure mode. Manufacturers meet the challenges of high power dissipation through the use of advanced materials in the voice coil former, some using aluminum and Kapton laminates, in conjunction with high temperature adhesives and dielectric insulators.

http://en.wikipedia.org/wiki/Voice_coil

Feeel free to touch on any topic related to Subwoofer- and if at any one point you find it wrong please feel free to correct me . //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[snoopdan 5,000+ posts]

Here are some more breakdown images. The animated video is an Elemental Designs sub, and of course the other one is some photos of me disecting an older Type R.

Speaking of cooling, ive seen some people run air conditioner lines to magnets and cool them with antifreeze as well. Really any method of getting rid of heat is just fine.

 

[bigbassman Premium Member]

we used to use alot of dry ice at shows...

Loyd L.

 

[xterra_on_22s 10+ year member]

wow good info thanks