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Old 29th March 2013, 11:34 AM   #4011
kees52 is offline kees52  Netherlands
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Join Date: May 2009
Location: Sprang-capelle Holland.
Hi All


I have did model in akabak a tapped horn, first in hornresp.

in akabak because of putting a filter in, 24dB octave linkwitz.
the peak every tapped horn has around 80 Hz of 10 dB don,t go away
with a analog filter, now I think a filter in akabak is lossless and so
I have to include a resistor in akabak also.

I did make a S1-S2 a duct and add stuffing the peak is from the throat.

Handy tha akabak.


regards
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File Type: jpg tappedtest.jpg (67.9 KB, 270 views)

Last edited by kees52; 29th March 2013 at 11:58 AM.
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Old 29th March 2013, 01:39 PM   #4012
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by kees52 View Post
Hi All


I have did model in akabak a tapped horn, first in hornresp.

in akabak because of putting a filter in, 24dB octave linkwitz.
the peak every tapped horn has around 80 Hz of 10 dB don,t go away
with a analog filter, now I think a filter in akabak is lossless and so
I have to include a resistor in akabak also.

I did make a S1-S2 a duct and add stuffing the peak is from the throat.

Handy tha akabak.


regards
Hi Kees,

I've been very busy for a week but have more time now.

You've posted a lot....I have a suggestion: Always post an input screen or refer(link) to one for each of every posted plot. Your posted AKAbak FR tells me nothing: Its for a TH obviously, thus resembles a summation of two coupled IR's that may be to far apart in time and have summed response that is not minimum phase. If EQ'd using a PEQ: more than one filter would be necessary if you cannot tame the response at the physical place of origin.

I find it's awkward and a bad design for any sub if necessarily needing EQ in the passband but not for global EQ'ing of a whole System setup.

BTW are you confident when adding any type of Filters in AkAbak?

b

PS: By confident I meant: Why not add PEQ Filters to your design and test if you can smooth out the FR?

Last edited by bjorno; 29th March 2013 at 01:45 PM. Reason: Adding text
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Old 29th March 2013, 01:54 PM   #4013
kees52 is offline kees52  Netherlands
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Join Date: May 2009
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Quote:
Originally Posted by bjorno View Post
Hi Kees,

I've been very busy for a week but have more time now.

You've posted a lot....I have a suggestion: Always post an input screen or refer(link) to one for each of every posted plot. Your posted AKAbak FR tells me nothing: Its for a TH obviously, thus resembles a summation of two coupled IR's that may be to far apart in time and have summed response that is not minimum phase. If EQ'd using a PEQ: more than one filter would be necessary if you cannot tame the response at the physical place of origin.

I find it's awkward and a bad design for any sub if necessarily needing EQ in the passband but not for global EQ'ing of a whole System setup.

BTW are you confident when adding any type of Filters in AkAbak?

b

PS: By confident I meant: Why not add PEQ Filters to your design and test if you can smooth out the FR?
Hi Bjorno

I have plans to make a T-TQWT with the infinity with two drivers, so I have a apart THrEAD to post, I go post the anwer there.

T-TQWT subwoofer

if you go there you find more about the T-TQWT who is indeed a lot more forgiving, I go maybe in future actieve crossover for the tapped horn because I am curieus about the bass.

see you on my other thread.

thanks

kees
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Old 29th March 2013, 02:30 PM   #4014
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by kees52 View Post
Hi Bjorno

I have plans to make a T-TQWT with the infinity with two drivers, so I have a apart THrEAD to post, I go post the anwer there.

T-TQWT subwoofer

if you go there you find more about the T-TQWT who is indeed a lot more forgiving, I go maybe in future actieve crossover for the tapped horn because I am curieus about the bass.

see you on my other thread.

thanks

I went to that thread but is still confused as no input(or dimensioning) for the graphs are given and I've noticed that you may have problems to interpret the plots when extrapolation the use of damping material or to use filter simulations(HPF's LPF's PEQ's) to get an idea of a possible plausible final result.

b




kees
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Old 29th March 2013, 05:28 PM   #4015
kees52 is offline kees52  Netherlands
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Hi bjorno


I have set the script in the new thread, I don not use PEQ only a low pass filter analog, I do not use plate amps, I do use mosfet hybride, (own design) have a allfet ready for eventual electronic bass with tapped horn, just now I want build some different boxes because interest how it sound, as I do with amps.

The script where i have done input of coils and caps for filter without the akabak own filter I have lost.

iI think measurements with my microphone will be best simulation is to get close.

If I go test tapped horn I get here again, now for T-tqwt I go y own now, or yours if you have a T-tqwt thread.

regards

kees
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Old 5th April 2013, 10:34 AM   #4016
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by kees52 View Post
...akabak is not difficult but i can,t figure out what a notch filter for the 65 hertz tapped horn peak is to implemented in akabak maybe he can not do that.

nice software it is a pity that it is not supported anymore.
Hi Kees,

Quote:
he can not do that.
He if it's me ? you are referring to can: Ref. your post #3999: I've put TF(Transfer Function) info on how to add PEQ(s) to AKAbak ...or in MathCad that is IMO more convenient...in a picture:

b
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File Type: jpg PEQ-filter.jpg (879.1 KB, 231 views)
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Old 5th April 2013, 11:05 AM   #4017
kees52 is offline kees52  Netherlands
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Quote:
Originally Posted by bjorno View Post
Hi Kees,



He if it's me ? you are referring to can: Ref. your post #3999: I've put TF(Transfer Function) info on how to add PEQ(s) to AKAbak ...or in MathCad that is IMO more convenient...in a picture:

b
Hi Bjorno

Thanks.

I am busy with a T-TQWT with two ifinity woofers, it do good in akabak only how to fold that, the two woofers above each other or do you isobaric (this is not possible here, woofers to deep) I do not need a notch here but I do if I als try a tapped horn in future to cure my curiosity.

L12 and L34 do this end between the two woofers? or have I need a minimum of in my case 33cm for L12 then I am between the two woofers.

regards

kees
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Old 5th April 2013, 11:48 AM   #4018
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by kees52 View Post
Hi Bjorno

Thanks.

I am busy with a T-TQWT with two ifinity woofers, it do good in akabak only how to fold that, the two woofers above each other or do you isobaric (this is not possible here, woofers to deep) I do not need a notch here but I do if I als try a tapped horn in future to cure my curiosity.

L12 and L34 do this end between the two woofers? or have I need a minimum of in my case 33cm for L12 then I am between the two woofers.

regards

kees
Hi Kees,

I prefer to put the Drivers above each other thus not isobaric as your drivers are of good quality and if L12 when simulating appear being on the outside of the box where S4 intersects one of the drivers:
In order to preserve correct distance to the junction L12/L34 =the point between the Drivers:
You have to move S4 to one of the longer side of the box as L12 is short.

In practice: This implies you have to add a small distance X to L12= to be the Driver frame width + a very small clearance, not shown in HR and close the original S4.
Then place the new S4 with a L12= What HR shows in your simulation: I.e. at a distance= S4/(Driver frame width - X) in front of the Drivers, located on the Lid you need for to access Speaker drivers.

b
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Old 5th April 2013, 01:03 PM   #4019
kees52 is offline kees52  Netherlands
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Thank you bjorno, this is what I need, I hav also download some tangband designs who explane also some things

I do see that a 1/4 alignment do widen the bandwith but give a peak on the low and high end, I did see when I do stuff it in akabak it do lower, also this is the case in the martin sheets, two woofers give a better vas/sd abd so better box action.

These woofers are indeed good made and not expensive, also did good in a tapped horn.

I have design already a allfet amplifier, fast one with current feedback, maybe later it go then active crossover.

picture example of the T-TQWT maybe you look at it.



regards

kees
Attached Images
File Type: jpg ScreenHunter_01 Apr. 05 15.06.jpg (61.2 KB, 171 views)
File Type: jpg ScreenHunter_02 Apr. 05 15.08.jpg (43.6 KB, 152 views)

Last edited by kees52; 5th April 2013 at 01:11 PM.
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Old 5th April 2013, 05:40 PM   #4020
kees52 is offline kees52  Netherlands
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Join Date: May 2009
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Bjorno, can you go to my T-TQWT thread there I have a message now.

T-TQWT subwoofer

thanks

kees

Last edited by kees52; 5th April 2013 at 05:45 PM.
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