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TABAQ TL for Tang Band
TABAQ TL for Tang Band
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Old 30th June 2020, 07:45 AM   #3051
nas3000 is offline nas3000  Lithuania
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Join Date: Sep 2016
Location: Vilnius
Originally Posted by GM View Post
Translating to nothing........ Per the chart, a shelf vent has a 2.227 'pipe' end correction, though without access to my own calculator based on measurements, not on pipe end corrections per se, I can't say how accurate it is other than it's my understanding that the chart has been vetted/well proven by others, both pro and DIY.

Re when does a reflex, which is presumed to have a uniform particle density air mass 'plug', change to a 1/4 WL resonator [MLTL, etc.], is when simmed using accurate pipe/horn theory, the 'visible' and/or measured turnover point is when the reflex calculated alignment is 'stretched' to a high enough aspect ratio [pipe compression ratio [CR] to my way of viewing it] that the vent is becoming too long for a given vent area [Av], i.e tuning [Fb, Fp] is 'creeping' lower due to increasing 1/4 WL pipe action increasingly damping the vent with increasing CR.

I currently only have Hornresp [HR] loaded, which has no shelf vent option and otherwise WRT accuracy only know that it's good enough when the vent is a reflex [hole in a box], be it just a box or some type of MLTL and one pipe vent MLTL recently done by 'Scottmoose' in MJK's software for comparison.

All that said, historically it was recommended to start with too large and or too long a vent and do final tuning in-room and IME, many times I had to tune each cab individually for best overall in room performance; though admittedly I'm from the era of 'acoustic solutions to acoustic problems' since highest practical acoustic efficiency was a primary goal, whereas today with ~affordable, high SQ, all encompassing DSP, cheap high power; speaker design has become mostly moot in [casual] DIY, consumer HIFI/HT apps.


Dear GM,

It may be my language barrier, but... Are you talking about personal calculator, which differs a little from the publicly known formulas?

Or there is another things to consider vent tuning, when building MLTL?

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Old 30th June 2020, 07:54 AM   #3052
perceval is offline perceval  Taiwan
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Join Date: Feb 2014
Location: Taiwan
So, tilting works fine.
I have the SB65 pushed back 15cm from a plumb line aimed at the base.

It is also great to better time align the woofer to the full range.

Nas, as I have stated, only the frequencies higher than 200Hz were affected, anything under, I guess the wavelengths are just too great to be affected by such a small change.

That room has bass traps in all 4 corners, but I still get dips and peaks in the lower frequencies if I move around the room.
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Old 2nd July 2020, 08:35 AM   #3053
Entas is offline Entas  Lithuania
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Join Date: Jun 2019
Location: Kretinga

I have attached a picture of two TABAQs. Which one looks better for you? Left one has a vent at the bottom and the right one, has a vent in the middle of the CSA (second attachement).
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File Type: jpg Front.jpg (78.1 KB, 76 views)
File Type: jpg Front2.jpg (52.5 KB, 75 views)


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