Voice Coil
- Low efficiency ~ 3-5% power convert: electric → 3-5% acoustic power + Heat
- generating heat
Coil
- Copper wire
- Eg AWG31 4 layer DCR 3.5 Ohm
- Copper clade aluminum wire
Form
heat management
- fiber glass
- Aluminum
- poly MI film (Capton)
Cone
- Paper → most common
- craft paper abaca fiber
- polypropylene → out-door mostly woofer
- carbon fiber → out-door in-door durable
- acrylic treat fiber
Magnet
Ferrite - heavy, low cost, common Neodymium - 10 time power of ferrite and also the cost Alnico - (Aluminum + Nickel + Cobalt) very high cost, find in guitar amp
T-Yoke
Front plate
Demodulating ring / Short turn / Faraday loop
Because of the pole piece of T-yoke act like a iron core of the inductance (voice coil), when the voice coil extrude out the area of iron core inside the voice coil will be reduced. That will cause a distortion, called inductance distortion
Basket
Stamp Steel - Cast Aluminum - higher end
Spider
- treated cloth
Surround
Rubber polyether foam cloth
Tinsel wire
copper wire wrap around keplar
Dust cap
Gasket
- compatible form
Tweeter
Dome
-
aluminium
-
aluminium-magnesium alloys
-
titanium
-
beryllium (hazardous)
-
polyester film
-
silk
-
polyester fabric
-
[add] polymer resin