T-TQWT subwoofer

[kees52]

Have seen than the exit is different by yours, I have now make that also that way and go measure again.

See the pic of how it is now, I have put on hornresp some stuffing and then the peak/dip do dissapears almost but not with mine sub itself.

(all inside measured so thinkness wood is also automatic calculated).

L12 = 180 cm
L23 = 250,2 cm
L34 = 14,10 cm (Here now some doubt!)

pipe is 375 cm2.

but did exit different (maybe cause?)

regards

 

[kees52]

with stuffing I get this with the box as made it, I can not change that anymore but when do the stuffing it still gets that nasty peak on 52 hz.

Now I go try outside if it is dry there, .

regards

 

[BP1Fanatic]

Kees52, you have wasted space. Bjorno said internal height is 152.9cm. Based on your built height and design, your tap is in a different location than what he modeled.

 

[kees52]

Kees52, you have wasted space. Bjorno said internal height is 152.9cm. Based on your built height and design, your tap is in a different location than what he modeled.

Wasted space I did now, a little, but the sub is build in 2015 and so I can not change much except I have the tap now on the proper place. Further changes is not easy or even not possible because of the glue.

I did some measurements inside with the stuffing Björno advised but I have a nasty room

I go make a new sub because I want to use it with a horn (trynergy), this sub is only made as a test past year but mother need attention because of the age and sickness.

http://www.diyaudio.com/forums/full...-trynergy-full-range-tractrix-synergy-52.html

 

[BP1Fanatic]

Are you using any DSP?

 

[kees52]

Are you using any DSP?

no not a dsp, I use a 24 dB lowpass filter.

But maybe it is needed if room is quite nasty, therefore I do make a new one, that is a tapped horn, or inverter tapped horn.

outside measurement is a option to rule out room, but rain in holland I get for nothing.

The misunderstood what concerns length I have to explane how I did folt it in sketchup. I do always keep internel length and width
in mind, automatic it go right, the inside baffles for example. I do not need then to look at thickness of wood in sketchup.

This way I have also draw this sub in it but never build, it looks good, folding I have some experience with now.. I draw always form inside out so thickness get automatic right.




regards

 

[bjorno]

Wasted space I did now, a little, but the sub is build in 2015 and so I can not change much except I have the tap now on the proper place. Further changes is not easy or even not possible because of the glue.

I did some measurements inside with the stuffing Björno advised but I have a nasty room

I go make a new sub because I want to use it with a horn (trynergy), this sub is only made as a test past year but mother need attention because of the age and sickness.

http://www.diyaudio.com/forums/full...-trynergy-full-range-tractrix-synergy-52.html

Hi Kees,

The first of your submitted Pictures show the Response of your T-QWP
as measured ~ at a point where the Mic. doesn't dip into the Terminus end correction= OK.
Looks like you only have a Room problem.

Note: The T-QWP Terminus should be placed close to the Floor,not at a Height of 147 cm above !

b🙂

 

[kees52]

Hi Bjorno

I have now flip the dbox so terminal is on floor again, do not much different with that.

The canceling however do go up to 80 hz, so there is a fault in length of box, I go however do a tapped horn or a inverted tapped horn, for use with the synergy horn, it needs more efficienty and the visaton pipe do not give enough, however it is a nice learning curve.

I have also buy a volvo 164 so I have to repair so I have transportation.

regards

kees