« previous next »
Pages: [1]   Go Down

Is Polyfill needed when using no-rez? (sealed sub)

0 Members and 1 Guest are viewing this topic. Read 1098 times.

makdoogle

  • Jr. Member
  • Posts: 16
Is Polyfill needed when using no-rez? (sealed sub)
« on: 13 Mar 2013, 11:58 pm »
Do I need to use polyfill in a 12" sealed sub enclosure built to Danny's specs when lined with no-rez?
Logged

Danny Richie

  • Facilitator
  • Posts: 14354
    • http://www.gr-research.com
Re: Is Polyfill needed when using no-rez? (sealed sub)
« Reply #1 on: 14 Mar 2013, 12:37 am »
Quote from: makdoogle on 13 Mar 2013, 11:58 pm
Do I need to use polyfill in a 12" sealed sub enclosure built to Danny's specs when lined with no-rez?

I like to use a little to cover the amp in the back.
Logged

harley52

  • Full Member
  • Posts: 318
Re: Is Polyfill needed when using no-rez? (sealed sub)
« Reply #2 on: 14 Mar 2013, 12:49 am »
Polyfill fools the driver into looking as if it is in a larger enclosure. There is a formula for the amount of polyfill to cubic inches/feet of the enclosure. Off hand I don't recall what the formula is, but it can be found in The Loudspeaker Design Cookbook by Vance Dickason. Having said that, if you built the enclosure to the size Danny suggests then the answer is no.
Logged
Pages: [1]   Go Up
« previous next »