Blocking up ports to make sealed box. |
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PolymorphicMark
Registered User Joined: 27 May 2004 Location: United Kingdom Status: Offline Points: 444 |
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Posted: 05 May 2018 at 1:01pm |
I have a pair of bass reflex cabs using dual RCF L15P200's at 158L. I want o experiment using them as sealed cabs above some double 18 bass flex. My question is whats the best way to block up shelf ports temporarily? I was thinks about some sort of closed cell solid foam. I don’t want to screw board across the front as it will look naff.
If I just block the exit of port does the port does the volume of the port become part of the box volume? or will it just become a half wave resonator? |
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midas
Old Croc Joined: 27 October 2011 Location: Cumbria Status: Offline Points: 2117 |
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foam is the easy way. But also entertaining if it is not quite tight enough, pops out like a champagne cork.
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In bass no one can hear you scream!
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LunchieTey
Young Croc Joined: 06 February 2005 Location: Australia Status: Offline Points: 934 |
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yes, get a very large piece of closed cell foam you have to very firmly squash and pack in the slot!
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Speaker addict
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PolymorphicMark
Registered User Joined: 27 May 2004 Location: United Kingdom Status: Offline Points: 444 |
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Thanks for the answers
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Free to do what i WANT
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Hemisphere
Old Croc Joined: 21 April 2008 Status: Offline Points: 2272 |
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How the port behaves as part of the enclosure volume will depend on how wide and how long it is. I would guess it's a sliding scale between acting fully as part of the enclosure volume (for a big open shelf) and hardly at all for a long thin bendy tube, but how the scale slides I have no idea.
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midas
Old Croc Joined: 27 October 2011 Location: Cumbria Status: Offline Points: 2117 |
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oh I miss read that.
If they are big rectangular ports, I would think about big foam block, squeezed in from inside the box. It won’t matter if there is any not squeezed in the port, it should help remove some of the boominess that wadding does. You could staple it from inside too, to help keep it in place.
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In bass no one can hear you scream!
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