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Old 31st January 2011, 06:33 PM   #21
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IIRC = if i recall correctly.

No one has researched the optimum Karlson slot size. If i ever build one of these (with no corners not any time soon), i would make the slot with drilled holes, start slow, and grow the slot until i was happy.

dave
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Old 31st January 2011, 06:35 PM   #22
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Bet me re the 126. It does if you want to get LF out of it with any semblence of dynamic BW in a back-load.

Anyway, I didn't get chance to do any detailed tests, but like GM, I found under certain conditions the mass loaded tapped horn (BIB) was notably superior; particularly (and as you would expect) regarding their upper corner roll-off. Incidentally, properly executed chokes in horns are nothing new; Harry Olson advocated them back in the late 1930s & I don't recall many complaints about his designs.

Last edited by Scottmoose; 31st January 2011 at 06:47 PM.
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Old 31st January 2011, 06:47 PM   #23
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Bet me re the 126. It does if you want to get any LF out of it with any semblence of dynamic BW.
But there is a limit to how far you can go. IIRC the BIB calc says the minimum horn for a FE126 should be about the 2 m. Going much over that will get you deeper but more attenuated bass and maybe get resonances.

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Anyway, I didn't get chance to do any detailed tests, but like GM, I found under certain conditions the mass loaded tapped horn (BIB) was notably superior; particularly (and as you would expect) regarding their upper corner roll-off. Incidentally, properly executed chokes in horns are nothing new; Harry Olson advocated them back in the late 1930s & I don't recall many complaints about his designs.
I don't recall seeing many others use it in the meantime. If it is such a fast and easy win win way, why doesn't everyone use it?

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Old 31st January 2011, 06:58 PM   #24
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But there is a limit to how far you can go. IIRC the BIB calc says the minimum horn for a FE126 should be about the 2 m. Going much over that will get you deeper but more attenuated bass and maybe get resonances.
I wasn't refering to the BIB. I know its limits well, I was the one who triggered off that monster thread, & did a lot of the text on the 'Zilla site, while GM was the one who came up with a workable T/S based Vb alignment for it. Either way, generally not a good idea to tune below 0.707Fs in it, whatever the driver.

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I don't recall seeing many others use it in the meantime. If it is such a fast and easy win win way, why doesn't everyone use it?
But you do see it. It's quite common in DIY circles. What do you think the type of box that has become known as an ML-TQWT is? A mass loaded tapped horn, that's what.

Last edited by Scottmoose; 31st January 2011 at 07:02 PM.
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Old 31st January 2011, 07:39 PM   #25
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Well, thanks for explanation on Bib and iBiB.

Anyway I do not explain well about area of Karlson hole. In the unique iBiBk plan area is 27 in^2. From where does this value exit?
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Old 31st January 2011, 07:45 PM   #26
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In the unique iBiBk plan area is 27 in^2. From where does this value exit?
That value was pulled from the air, and choosen small enuff that it could be grown if needed.

Some historical, empirical info suggests that the length of the slot could be as long as a 3rd the length of the entire line.

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Old 31st January 2011, 08:03 PM   #27
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Some historical, empirical info suggests that the length of the slot could be as long as a 3rd the length of the entire line.
Yup. From Norman Fulmar's 1952 Patent application (granted 1957):
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Old 31st January 2011, 10:53 PM   #28
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I was going to add this to the last, but ran out of time. Whatever you wish to call them, an Av=Sd vent on a BIB style pipe horn as GM described & we were discussing before things became diverted can be an effective thing to try.
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Old 1st February 2011, 01:36 AM   #29
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Digression split off to here

Line restrictions in horns & pipes

dave
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Old 2nd February 2011, 04:10 AM   #30
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Well you get higher efficiency in a smaller box, and the small BR hump before the LF extension falls off a cliff, that gives the illusion of lower extension.
The trade-off is lack of precision and lack of extended smooth roll-off.
Who said anything about a smaller box? Mine were acoustically quite large and the HR sims adding reverse cone 'tophats' I did were BIBs that were calculated using the BIB Excel WS and had already been built and favorably reviewed by others.

Yes, the roll off is a bit steeper, but again, if tuned low enough it's no where near the big deal you're implying due to our hearing acuity being so poor in the LF where the room dominates anyway.

GM
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