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View Full Version : Port size vs Cabinet Volume


mbottz
10-31-2005, 09:00 PM
This Bass tuning thing has got me confused, The L-100, L166, and the L65 all share the same bass port, with enclosures that are different volumes. How can this be? They each use a 12" Woofer. Is it the difference in woofer characteristics?
I am sure most of you understand this tuning stuff very well. Can someone explain this to me in simple terms that a layman such as myself can understand?:confused:

Thanks


Mike
boputnam
10-31-2005, 09:41 PM
The L-100, L166, and the L65 all share the same bass port... Is that true? Do you mean port only, or duct, too?
'nother words, is their duct volume identical? :dont-know If so...


Is it the difference in woofer characteristics? Partly, :yes: , and also in the tuning (Fb) of the cabinet.

To know what Fb is (without prior knowledge...), you can model the various factory cabinet dimensions, with the factory port(s)/ducts and woofers, in a number of pretty slick packages, including BassBox Pro, and the freeware WinISD (http://www.linearteam.dk/ (http://www.linearteam.dk/)) which has the Thiele-Small parameters of the transducers preloaded, and where you can input all other cabinet and duct/port variables - make a donation if ever you can... :applaud:
Ian Mackenzie
10-31-2005, 10:29 PM
Is that true? Do you mean port only, or duct, too?
'nother words, is their duct volume identical? :dont-know If so...

Partly, :yes: , and also in the tuning (Fb) of the cabinet.

To know what Fb is (without prior knowledge...), you can model the various factory cabinet dimensions, with the factory port(s)/ducts and woofers, in a number of pretty slick packages, including BassBox Pro, and the freeware WinISD (http://www.linearteam.dk/ (http://www.linearteam.dk/)) which has the Thiele-Small parameters of the transducers preloaded, and where you can input all other cabinet and duct/port variables - make a donation if ever you can... :applaud:

Hey Bo's a dang Expoit on ports...you better listen up.

Dude, How is that young bucks Alpine car subs we fitted to them dang boxes in his Yankee pickup truck? Has he upgraded to JBL's yet?

Man that was an amazing experience watchin you work your magic with them there ports...T/L paramters and all. Gotta watch them oval ports though ain't ya reckon.:applaud: Dang cracks me up everytime..thinkin of you in your garage. Hell I think I wet myself..again. Damn Yankee:rotfl:



Ian
Ian Mackenzie
10-31-2005, 10:33 PM
Mike,

Your avatar looks familiar....I do recall spending an rather enjoyable evening in that lounge room!

Ian
rek50
11-01-2005, 06:01 AM
"Gotta watch them oval ports though ain't ya reckon.:applaud:" Listen to the "Doc" lookin at a women from "Down Under"...
boputnam
11-01-2005, 08:21 AM
Dude, How is that young bucks Alpine car subs we fitted to them dang boxes in his Yankee pickup truck? Has he upgraded to JBL's yet?
Likely stacked high with flats of (warm or empty...) coldies, long ago. He couldn't hear then - noway that's improved! :p
Ian Mackenzie
11-01-2005, 12:59 PM
Likely stacked high with flats of (warm or empty...) coldies, long ago. He couldn't hear then - noway that's improved! :p

I had to translate your terminology - flats - slabs.

The most I've ever stacked is 35 (dozen) flats for the Bathurst Race meet..dang car was on a tilt all way up the mountain.....well worth the effort.