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23rd June 2011, 04:21 PM
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#1 |
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diyAudio Member
Join Date: Nov 2008
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Can I cheat on cabinet size with porting?
I have a full set of ATC drivers that I will never get around to making cabinets for. The 12" woofers I have are for SCM100 (100 litre cabinets) and I have a nice pair of 75 litre cabinets. The real SCM100 are ported using a 4" wide, 8" long pipe. Can I use some other size or an extra port to make the cabinet "act" bigger? Or do I need to just sell the drivers or build/find the right cabinets?
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23rd June 2011, 05:17 PM
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#2 | |
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diyAudio Member
Join Date: Aug 2002
Location: victoria BC
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Quote:
stuffing can help increase the virtual volume, changing net port dimensions could take the tuning in a misdirection
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you don't really believe everything you think, do you? community sites t-linespeakers.org, frugal-horn.com commercial site planet10-HiFi |
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23rd June 2011, 05:36 PM
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#3 |
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diyAudio Member
Join Date: Jun 2002
Location: USA, MN
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you can make it smaller, just make sure your new port tunes to about the same frequency.
__________________
Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan |
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23rd June 2011, 06:07 PM
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#4 |
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diyAudio Member
Join Date: May 2009
Location: Seattle, WA
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Sub Box Polyester Fiberfill
If you fill it to the point where you get a 40% increase in volume size, then you'll get an effective volume of 105L from you 75L box. 
Last edited by chazdrumzalot; 23rd June 2011 at 06:10 PM. |
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23rd June 2011, 09:50 PM
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#5 |
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diyAudio Member
Join Date: Nov 2010
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You can put the ports external to the box
Ports take up internal space so it would work although the aesthetics are not WAF friendly. The other option is to install flat panel passive radiators instead of ports--tune the passive to smooth response in the final location the speaker. I built a subwoofer out of an existing 3.5 cu ft cabinet, went with the passive radiator so I could easily tune it to it's corner location. Final tuning was 21.4 Hz and smooth... 
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24th June 2011, 02:52 AM
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#6 |
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diyAudio Member
Join Date: Nov 2008
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Is there a favored software for determining or predicting driver performance in differing enclosure volumes? If I were to go by trial and error using polyfill, would a test CD and Ratshack db meter get me pretty close to flat response? Needless to say, audio engineering is not my specialty...
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24th June 2011, 03:02 AM
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#7 |
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diyAudio Member
Join Date: May 2009
Location: Seattle, WA
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24th June 2011, 04:07 AM
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#8 | |
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diyAudio Member
Join Date: Nov 2008
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Quote:
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