Odougbo I try to make something myself, yours are looking good but I have to lay my border somewhere (do I say this oke) I have not so much space and it is not needed to shake the house and the nabure to see waves in the glass cola.
Thanks ODougbo for the link. At first glance, I reckon that the SilverFlute 6 1/2" drivers would work just as well as these subwoofers. So I would still be interested in your THs and folds. Thanks.
Can't believe you mentioned SF, woofers (a bit of a SF frenzy going on now). Yeah, they would probably work, but you'll need all new plans/box.
I'll send you a PM with a link to a SF build.
I'll send you a PM with a link to a SF build.
I have made the T-TQWT with two inifinty 1260W reference woofers, Nice to say that these woofers do well in the Lab12 tapped horn when change L12 to 20 and L34 to 80 L23 to 450. woofers are not expensive.
see picture for the T-TQWT with help also of Bjorno, thanks, Folding I get now, after try, try, try, again. But you can maybe do a look at it tell if something is wrong, so I learn the most.
Bjorn you did make a sample box for me, you remember based on the infinity, but unfortanely these woofers are very deep, and it do not fit wel, to big magnet also, so I did make the S1 bigger for now 680 cm2 then I have space and air.
regards
kees
see picture for the T-TQWT with help also of Bjorno, thanks, Folding I get now, after try, try, try, again. But you can maybe do a look at it tell if something is wrong, so I learn the most.
Bjorn you did make a sample box for me, you remember based on the infinity, but unfortanely these woofers are very deep, and it do not fit wel, to big magnet also, so I did make the S1 bigger for now 680 cm2 then I have space and air.
regards
kees
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Here I get 50 volts 12 mm xmax, 0.5-1-2 PI picture.
The lab 12 tapped horn max voltage is 25 volts before reach xmax, but in half space it reach then 130 dB what is painfull loud. these tapped horn is a nice candidate for a tube amp system with bass solid state and a fostex horn with tube gear, very nice system.
in 2.0 space 110 dB with 25 volts before reach xmax, 1 space 122 dB with 25 volts but a tapped horn is best in 0.5 or 1 space I think, mayve the infinity is 13 mm xmax in half, so it do 26 mm, but I do not now, I do mail the manufaturer...
regards
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Okay
I have done the simulation and build now the wood part, I do use two wsp26s woofers in isobaric to hlave the big vas for this woofer to crimp the T-TQWT itselfs. the box is 172 liters big, delay 39 milliseconds on resonance (20Hz).
I am curieus about what it does, this the first one, and the next is a tapped horn who have exp flare for better respons, (a lot of panels;-))
I have done the simulation and build now the wood part, I do use two wsp26s woofers in isobaric to hlave the big vas for this woofer to crimp the T-TQWT itselfs. the box is 172 liters big, delay 39 milliseconds on resonance (20Hz).
I am curieus about what it does, this the first one, and the next is a tapped horn who have exp flare for better respons, (a lot of panels;-))
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You should model the TH with a parabolic flare unless you are going to truly build an exponential horn.
Post #27
Hi kees52,
The picture of the inside of the box in Post #27 shows two drivers in an isobaric configuration. The Hornresp Input screen shows: TH 2P 2p; I think this means two parallel connected isobaric pairs in parallel with each other, or in other words four drivers.
Regards,
Hi kees52,
The picture of the inside of the box in Post #27 shows two drivers in an isobaric configuration. The Hornresp Input screen shows: TH 2P 2p; I think this means two parallel connected isobaric pairs in parallel with each other, or in other words four drivers.
Regards,
Hi TB46
Yes you are right I did use the wrong export pics.
this are the good ones, the other was a test only not a build..
The two peaks are on purpose because of the needen damping, when damped
see the akabak plot with 24dB octave low pass filter, a T-TQWT feel happy with a analog filter, this box is fine with a open baffle mid high..
regards
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Wel I have did a measurement, I see it do fall of from 40 hz -10 dB on 20 Hz.
I did it without damping, with it it fals af even higher, I do not now if leaks in the
box will cause this, I think yes, I need really a airtight box Am I right?
one measurement 1 meter away fro port and the other was close to the port.
akabak predict a better measurement.
thanks.
kees
I did it without damping, with it it fals af even higher, I do not now if leaks in the
box will cause this, I think yes, I need really a airtight box Am I right?
one measurement 1 meter away fro port and the other was close to the port.
akabak predict a better measurement.
thanks.
kees
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Oke
I have now make al the leaks fixed, and put the sub in a corner.
this are the measurements after that, looks a lot better but still a
peak in the 55 hz, the fall off starts around 20 hz so it is close to
hornresp prediction, leaks where the cause of the big fall off around
45 hz before fixing..
I have a isobaric box, I ask myself can I use the two woofers each
on a amplifier channel output? with two low pass filters? if bass notes
to 100 hz is mono afcourse.
Or exist there a filter who can put between two channels of the amp,
I have read something about that somewhere long ago I think that this was elector speaker book.
I do now, the house is shaking very easely, efficienty of sub is exactly
oke for the open baffles, it sounds very well with them.
I have now make al the leaks fixed, and put the sub in a corner.
this are the measurements after that, looks a lot better but still a
peak in the 55 hz, the fall off starts around 20 hz so it is close to
hornresp prediction, leaks where the cause of the big fall off around
45 hz before fixing..
I have a isobaric box, I ask myself can I use the two woofers each
on a amplifier channel output? with two low pass filters? if bass notes
to 100 hz is mono afcourse.
Or exist there a filter who can put between two channels of the amp,
I have read something about that somewhere long ago I think that this was elector speaker book.
I do now, the house is shaking very easely, efficienty of sub is exactly
oke for the open baffles, it sounds very well with them.
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Kees,
That 50hz bump, is it always like that on every measurement?
I had a bump on my measurement too but occasionally and it turned out to be my fridge humming away...
Now the fridge has moved to another location in the house and the bump is gone in my measurement!
That 50hz bump, is it always like that on every measurement?
I had a bump on my measurement too but occasionally and it turned out to be my fridge humming away...
Now the fridge has moved to another location in the house and the bump is gone in my measurement!
Well I did consider some day that it can be a 50 hz from the grid. I use the pc input and also this is not the way but i am
not ready yet with the mic amp.
Thanks consider that to me, I go test it soon.
regards
kees
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Hi
The subwoofer do go bump from 55 hz to 85 hz, I measure in the mouth, I need damping
on that place but where exacly, it need be done in S2.
I can do damping in the S2 area calculating that length.
regards
The subwoofer do go bump from 55 hz to 85 hz, I measure in the mouth, I need damping
on that place but where exacly, it need be done in S2.
I can do damping in the S2 area calculating that length.
regards
Hi Björno
Here I try to explane what happens when try to measure it, I have also try outside with no succes, this is also why the box give a very strong bass on 50 hz followed by a dip.
one of the two ports are not oke I think but hornresp give a well outcome with trimming the box with stuffing except here, it cancels around 50 hz.
But when measuring in the mouth things go well, I has thought of leakage of the box, but I am not shure because I can not see it, leakage inside between channels will give cancel I think.
see the pictures what I mean, there is also tekst in it. the middle picture is measured in the mouth, there the peak is just slighty visible, but when furter away it give problem what looks like canceling or something.
thanks for help, you are the man for T-TQWT,s
PS I have the mouth high from the ground, (box unside down so it can radiate freely in room). I think a slight leak can already ruin the box. pictures are from only that problem box. measuring is 2 x pi.
regards
kees
Here I try to explane what happens when try to measure it, I have also try outside with no succes, this is also why the box give a very strong bass on 50 hz followed by a dip.
one of the two ports are not oke I think but hornresp give a well outcome with trimming the box with stuffing except here, it cancels around 50 hz.
But when measuring in the mouth things go well, I has thought of leakage of the box, but I am not shure because I can not see it, leakage inside between channels will give cancel I think.
see the pictures what I mean, there is also tekst in it. the middle picture is measured in the mouth, there the peak is just slighty visible, but when furter away it give problem what looks like canceling or something.
thanks for help, you are the man for T-TQWT,s
PS I have the mouth high from the ground, (box unside down so it can radiate freely in room). I think a slight leak can already ruin the box. pictures are from only that problem box. measuring is 2 x pi.
regards
kees
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Às you can see on pic 1 and pic 3 on previous post hornresp is quite precise, this dip/peak is a problem thought.
Strange is that it only occurs when mic is 20 to 60 cm from mouth and further giving all different measurements
as normal happen (roommodes).
regards
Strange is that it only occurs when mic is 20 to 60 cm from mouth and further giving all different measurements
as normal happen (roommodes).
regards
Hi Kees,
You should not measure to close to the Terminus of the T-QWP
I have no clue but if there is a Dip: Besides any Air-leak: Something is wrong with the dimensioning and/or Stuffing.
I cant read the Numbers in your Drawing
:It's a mess.😕
Have a look at my interpretation of a T-QWP using your Driver:
b🙂
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Hi Bjorno
the numbers in the picture are the dimensions, as she are in the hornresp pic.
If I measure furhter away I get strange peaks, I go measure outside, and let you see the measurements later on.
Here a better pic with the numbers or if you have sketchup you can load the skp file.
Did put a pic in who I did a time ago for a infinity woofer, did quite oke but never build it because did start with
horns, I go also to a tapped horn, or a inverted tapped horn together with the trynergy.
regards
the numbers in the picture are the dimensions, as she are in the hornresp pic.
If I measure furhter away I get strange peaks, I go measure outside, and let you see the measurements later on.
Here a better pic with the numbers or if you have sketchup you can load the skp file.
Did put a pic in who I did a time ago for a infinity woofer, did quite oke but never build it because did start with
horns, I go also to a tapped horn, or a inverted tapped horn together with the trynergy.
regards
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