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Old 12th February 2018, 12:24 PM   #61
Vix is offline Vix  Yugoslavia
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Probably Karlson 12 will provide some "thump" with Fostex 206, or a Dallas 2 horn; I hardly believe that any TL can do that...
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Old 13th February 2018, 08:56 AM   #62
srian is offline srian  Sri Lanka
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20th December 2008, 10:12 PM #9

MJK


Re: Re: MLTL v. ML TQWT



[I]So a quarter wave enclosure can be defined by a length, an area at the closed end S0, and an area at the open end SL. Assuming that the area varies linearly between S0 and SL (this is a simplification for this discussion, the area could vary exponentially or conically without impacting the explanation) then the resonant frequencies of the 1/4. 3/4, 5/4, .... are defined by these three geometric values. Mass loading refers to an intentional severe restriction placed at the open end that dramatically reduces the area from SL. This restriction can be a round port, a square or rectangular opening, or a narrow slot. The length of the restriction can be just the wall thickness of the enclosure or it can be significantly longer. The mass loading refers to the slug of air in the restriction since it acts like a concentrated moving mass. The benefit of mass loading a quarter wave enclosure is that it can now be made shorter in length for the same tuning frequency and the slug of air that is the mass load tends to reduce the output from the harmonics of the fundamental standing wave that is used to augment the bass output of the system. The fiber damping does not provide any mass load, it just provides damping of the internal standing wave resonances of the air in the enclosure.

Mass loading can be applied to a tapered TL, a straight TL, or a expanding TL which is commonly refered to as a TQWT. It works by the same principle for each geometry. In my opinion one geometry is not better then the other two if the designs are done correctly. Optimum driver position is a finction of the shape of the enclosure and the driver is typically placed at about 0.5 x L for a TQWT and between 1/3 to 1/5 x L for a straight or tapered TL. Depending on the degree of taper or expansion there will be an optimum position for the driver that will minimize the output from the higher harmonics.

Therefore, I would go for the Sony MLTL over PappasTL specially since it has the flexibality to be tuned by the port.

Vix,
The difference between a MLTL and a horn is when you hear a back loaded horn you dance the ball room with your partner while when you play the same music through MLTL you tend to shake your body to disco movements to what you feel through your body. My dream is to try and come as close as possible to that goal with the full ranger 206 by augmenting the lower bass to tame the excess mids and reach an excited state to escape from the usual boaring mellow moods
Now dont tell me to switch on my subwoofers which I packed away long time ago.

May be I am trying the impossibe, but thats what DIY is for!

john.
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Old 13th February 2018, 10:13 AM   #63
Vix is offline Vix  Yugoslavia
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John,
This is my MLTL with Fostex FE206e, a long time ago (2005 maybe). I could not get the sound I wanted from that one, as it is not a "natural" box for that driver; it is much better suited to Fe207.
So, I just dont't want that you go through the hassle of building a TL of any sort with Fe206, only to be disapointed. Either build a horn, or find another, more suitable driver. By the way, it did go low, but sounded thin in the upper bass...
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Old 13th February 2018, 10:52 AM   #64
zman01 is offline zman01  Bangladesh
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Pappa's TL
Quote:
Originally Posted by Vix View Post
By the way, it did go low, but sounded thin in the upper bass...
Good point Vix... if the cabinet is tuned too low/incorrectly then the mid-bass tends to suffer - software modelling shows the same.
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Old 13th February 2018, 11:52 AM   #65
srian is offline srian  Sri Lanka
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Hi Vix,
Does your cabinet have a folded TL inside it?
Look at the drawing at post #54 where I have drawn the Sony cabinet. It contains folded chamber of length of 95" or so.
To create that you need to have a separator inside the cabinet separating the front and back chambers with a fold at the top and a port at the bottom.
I think this long line is responsible for the low to mid bass frequencies in the Sony box.
If you have the drawings or measurements of your cab please give it here so that I will keep away from repeating the same design.

regards,
john.
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Old 13th February 2018, 12:07 PM   #66
srian is offline srian  Sri Lanka
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The original Sony driver along side the 206.

john.
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Old 13th February 2018, 01:21 PM   #67
Vix is offline Vix  Yugoslavia
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Quote:
Originally Posted by srian View Post
Hi Vix,
Does your cabinet have a folded TL inside it?

regards,
john.
Nope. It is an ML TL. The drawing used to be here:
Quarter Wavelength Loudspeaker Design

I no longer have them
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Old 13th February 2018, 02:58 PM   #68
srian is offline srian  Sri Lanka
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Hi Vix,
If I tell you that the speaker you built for the 206 did not contain a long separator panel inside the main cabinet of at least 40" between the front and the rear chambers, am I correct ?

john.
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Old 13th February 2018, 04:50 PM   #69
phivates is offline phivates  United States
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That is what he told you.
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Old 14th February 2018, 06:52 AM   #70
srian is offline srian  Sri Lanka
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Hi phivates & Vix,
I thought as much.
Thats the box I am using currently with the 206.
I have tried many different boxes wich I came across with 8" hole with the 206.
The above box is the only one which came close to my expectations.
But it has a major flaw as you need mid rang attenuation to use with 206.
The plans, the BSC, and the description is found in the link bellow.

Project 5 : Virtual Fostex FE-206E and FE-207E ML TL Design

I think using a cab like the Sony SS-TL40 will correct all the flaws inherent to the 206.
Looks like no one is prepared to test the above box for me with the software.
I am scared to replace a driver of Sd= 206cm into a cab designed for Sd= 156cm.

Your valued response is most wellcome.

john.
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