Place an Order? Toll Free: 1-800-511-3343
Shopping Cart -
0 item(s)
Search by
Hello Guest, Login

Diaphragm for Foster Fostex Speaker D-420-4 (4 PACK)

Part Number:D-420-4
Diaphragm for Foster Fostex Speaker D-420-4 (4 PACK)
SS Audio Speaker Diaphragm D-420 (4 PACK)
Diaphragm for Foster Fostex Speaker D-420-4 (4 PACK)
Your Price:$60.00
List Price:$96.00
You Save:$36.00


In Stock
Foster & Fostex Speaker Diaphragm 4-Pack Part # D-420-4
Foster Fostex N30 Diaphragm
  • Foster & Fostex Speaker Diaphragm 4-Pack Part # D-420-4
  • Includes 4 x D-420 Diaphragms for Foster & Fostex speaker horn drivers 
  • Voice coil: 1" (25mm)
  • Diameter: 1-3/4" (45mm)
  • Length: 2-7/8" (72mm)
  • Impedance: 8 ohm, DCR: 7 ohm
  • Phenolic dome with copper voice coil on Nomex former.
  • Our most popular replacement diaphragm!
  • Fits Foster & Fostex N30, 025H30, H025N30, H025N27, H025N28, FT300H drivers and many others including:

    Foster: N-30, N30, N 30, N08, 025H30, H025N30, H025N27, 025N27, H025N28, FT-300H, FT 300H, FT-500H, FT 500H, FT500H, HT 404, HT-405, HT 405, HT-406, HT 406, HT-407, HT 407, HT-408, HT 408, HT-410, HT 410, HT 411, HT-412, HT 413, PHT-404, PHT 404, PHT-405, PHT 405, PHT-406, PHT 406, PHT-408, PHT 408, PHT-408, PHT 408, PHT-410, PHT 410, Fostex: FT300H, HT404, HT-404, HT411, HT-411, HT413, HT-413, Ampeg: 86-515-08, Crate: PE-15H, PE 15H, Carvin: 025N01D, Community, Cerwin Vega: C-8G, C8G, C 8G, X-Tealth, Roland: KC-500, KC 500, KC-550, KC 550, Selenium: RP-DT150, RP DT150, SHS, Sunn, SWR: SWR Goliath, SWR Redhead, SWR Megoliath, Sound Tech, Yorkville, P-Audio: HT-406, HT406, Yamaha: JAY-68625 JAY 68625, Tosh TE 12H, TE12H, and many more!

    Please check your model and style before ordering to be sure you are getting the correct speaker diaphragm.
Foster Fostex Diaphragm
  • We sell the long shaft Cerwin Vega version of this diaphragm. See our Cerwin Vega diaphragms page for details.
5 Stars
High quality fast Shipping
Did you find this helpful? 
Reviewed by:  from israel. on 6/17/2016
5 Stars
Just Like The Original!
These tweeters not only sound great, they can bring your sound back to life by turning a dead cabinet into one that will give off those brilliant highs every musician looks for. Easy to install and fits like a glove. I recommend this product to anyone looking to replace their blown or damaged tweeter in a fostex horn Thanks Simply Speakers for making an outstanding quality product and for making it so easy to get my hands on 'em!
Did you find this helpful? 
Reviewed by:  from Vancouver, BC. on 1/27/2015


  • Speaker Repair Videos
  • SS Apparel
  • Diaphragms & Parts
  • New-Edge-It Foam Kits
  • Pro Cloth Edge Kits
  • Rubber Edge Kits
  • Ferro Fluid Kits
  • Speaker Repair Parts
  • Advent - AR - NHT Parts
  • Genuine Eminence Parts
  • JBL Factory Parts
  • ESS Factory Parts
  • EV Factory Parts
  • Peavey Factory Parts
  • Replacement Speakers
  • Tweeters
  • Midranges
  • Woofers
  • Full Range
  • Speaker Grill Cloth
  • Speaker Grills
  • SS Audio Recone Kits
  • Speaker Adhesives
  • Speaker Dust Caps
  • Speaker Gaskets
  • Online Instructions
  • Speaker Accessories
  • Crossovers
  • Specials
  • Scratch and Dent - Open Box
  • Customer Photos & Videos*
  • Speaker Repair Photos
  • Special Order Parts
  • Top Sellers
    New Releases