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Old 4th September 2013, 09:07 PM   #41
Jim Shearer is offline Jim Shearer  United States
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Forgot to mention: the above curve has 1/12 octave smoothing.
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Old 4th September 2013, 11:47 PM   #42
phivates is offline phivates  United States
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Excellent thread
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Old 6th February 2018, 01:14 PM   #43
srian is offline srian  Sri Lanka
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Hi Jim,
please design a PapasTL for FE206e.
Internal 10".
Height and depth you decide.
Box size is not a problem.
Try to keep fs as close as possible to 39 Hz.
You have MJK 's sheet. Just give the data and calculate
height, depth and throat size keeping internal width to 10".
Will build with 3/4 MDF.

I will take full responsibility if sound bad.
You will only give me basic dimensions.
Please help me.
I am at present listening it in a 42" 10" 14" ported box.
It is driven with a 30 watt 6550 pp amp.
But like to experiment as I am also retired and have time at hand.
Soon I will be starting my 300B se amp.
(Its an Andy Grove design and sounds wonderfull.
I have built one with a friend, who has it now.
By the way my 6550 pp is also Andy Grove build of the good old days of the
Audio Note fame).

What ever information given by you people who know to
work with sheets is highly appreciated.

John.(Srian)

'Life becomes exciting when you listeni to the tube sound'.
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Old 6th February 2018, 04:09 PM   #44
Jim Shearer is offline Jim Shearer  United States
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Hi John,

I'm not sure what you are hoping to achieve with a new cabinet for your FE206e, nor do I have any idea how the current cabinets perform. If what you want is to maximize bass performance, then a BIB is what you want. But if you are hoping for chest thumping bass, then you need a whole different approach, as the FE206e will not do that. I can provide you dimensions for a BIB if you are interested.

If you do not like the idea of a BIB, then perhaps you would like Scottmoose's Half Chang, which was designed for the FE207e, but works very well with the FE206e is you add BSC. I built a pair of these years ago and was very happy with them. For BSC I used 1 mH and 5 ohms, but this depends on room conditions and your preferences. I might be able to find Dave D's old drawings for the Half Chang. Scott also had plans for larger double mouth horns for the FE206e, IIRC.

My PTL was not conceived as a way to extract maximum bass, rather to produce the quality of bass I wanted in my room. Yes, bass performance is highly room dependent!
As for designing a PTL for the FE206e, I really don't want to. It would take me several weeks, and would result in a design which you might or might not want to build--and I doubt anyone else would ever consider it.

Cheers, Jim
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Old 6th February 2018, 07:18 PM   #45
planet10 is offline planet10  Canada
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Quote:
I might be able to find Dave D's old drawings for the Half Chang
Or just email me for the URL. Half-Chang not really recommended for FE206, BSC might make it listenable but will eat up precious excursion.

The FE206 really wants to be in a horn. An optimum BR is 10 litres and barely reaches 100 Hz. Larger might give more lower bass, but will still be thin and have othe issues.

Or as a midTweeter with a helper woofer

dave
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Old 6th February 2018, 08:44 PM   #46
IG81 is offline IG81  Canada
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A driver like FE206e is screaming to be impedance-matched, either acoustically through a horn, electrically through a high-Z amplifier or a mix thereof.

Try it with 8ohm series in any box simulation software. It can look good in sealed or BR as the Qt is brought up to the more typical mid-0.30ies range.
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Old 9th February 2018, 09:07 PM   #47
srian is offline srian  Sri Lanka
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Hi All,
Thanks for the advice.

FE206e was born with a birth defect. That is the screeming mids.
I have seen people run out of audio set ups because they could not bare the higs.
Some go to the behind because the bass is so unbearable in disco's.
I have chased people out of my listning room with just 10 watts of mids played through the 206.
So you could imagine what the 206 mids can do.

What people do is to insert a bsc or a zobel filter to tame the mids.
I do not agree to that.
I have put a phase plug in front of the vizzer cone to disperse the mids.
We love the 206 even with this birth defect.
Its addictive.

I do not want to cut off this superior quality of the 206.
My intension is to find a bride for the 206.
So the pair can perform in harmony as a couple.
In the correct box 206 will sing and be unbeatable.

Last year I helped a friend to build a Woden design Vulcan horn speakers for his 206.
They were very efficient, very tall double mouth horns.
They play very loud and the mid range shrill was not at all present with these.
I was very dissapointed because the bass was orchestral and did not have the punch I craved somuch.
Now one would say "hey man you can't expect that kind of punch from a 206!!! ".
Wait till I tell you.

I have Sony SS-TL5 transmission line speakers.
They are 42 inch tall towers with 71/2 woofers.
First time I saw them at a friends place when he was watching a movie in his 5.1 setup.
Incresitive me, went close to the speaker to investigate what this alien was.
That dirty bugger knowing that a loud scene was about to come increased the volume.
I was thrown 3 feet back.
That was the only time in my life that I was scared by a speaker!

Now back to 206.
I removed the woofer from the Sony and tried to fit the 206 there.
The hole was too small.
I cut an 18 inch circular board with 71/2 hole and fitted the 206 the other way around over the mouth.
Connected directly bypassing the crossover and played music.
Man it was singing.
Punchy bass, no mid range shrill because the bas was adequate to level out the frequency responce with the mids.
Every thing was fine except for the looks.
The WAF was so terrible I had to dismantle the contraption and make them dissapear even before I could make some measurements of the experiment.
Sad memmories of a very short marriage !
Not me,' but 206!

I would have immediately made the hole bigger in the Sony and fixed the 206, but the cabinets are only 11" wide and 206 cannot go in there.
The idea to make new cabinets wide enough to accomodate the 206 was not attempted because
I was scared it woud upset the internal volume and due to that the performance.

So I will not believe anyone who says, that the 206 cannot rock.

That's why my cry for help to you, to design me a TL when I saw Pappas TL.
Thats why I am shy of horns.
Now you know my story.

We will think up something.
If I get lucky finding a bride for 206, I will invite you for the wedding.

good luck

john.
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Old 9th February 2018, 09:34 PM   #48
planet10 is offline planet10  Canada
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According to the spec the TL5 has a single 8” on the back TL loaded, and then a 6.5” sealed on the front + mid and tweteer for a 4-way system.

Most of the FExx6 series from Fostex have some scream, which is why they are often modified, sometimes heavily. Vulcan is an example of the kind of box needed to get maximum bass out of these drivers.

Click the image to open in full size.

dave
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Old 9th February 2018, 11:58 PM   #49
zman01 is offline zman01  Bangladesh
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Quote:
Originally Posted by srian View Post
Now back to 206.
I removed the woofer from the Sony and tried to fit the 206 there.
The hole was too small.
I cut an 18 inch circular board with 71/2 hole and fitted the 206 the other way around over the mouth.
Connected directly bypassing the crossover and played music.
Man it was singing.
Punchy bass, no mid range shrill because the bas was adequate to level out the frequency responce with the mids.
Every thing was fine except for the looks.
John,

Was your friend's HT amp driving the F206E when you had them in the Sony cabinet?

Were the other Sony speakers connected to the amplifier when you did the playback experiment? You mentioned your friend has a 5.1 set up. I am assuming you installed your FE206E to one cabinet only?
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Old 10th February 2018, 08:29 AM   #50
srian is offline srian  Sri Lanka
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Hi Dave,
See the phase plug used to disperse the 206 mids throuhg out the room. Without these mids are concentrated to a perticular area in front. The phase plugs do not attenuate the mids they disperse it in a wider field area.
rgds,

john.
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