Please help me!
Based on this project, which contains two driver 300w RMS each.
I would take the same project, and use only one driver.
How would the measures?
Considering the driver specifications:
Modelo 12SW3D6 12" Diametro: 12"
Pot. RMS: 300 WRMS
FS: 23.40 Hz
Qes: 0.347
Qms: 3.908
Qts: 0.318
Vas: 175.5 Lts.
Xmax: 13 mm
No: 0.631 %
Sens.: 90.02 W/m
Sd: 53.093 m²
Le: 1.9 mH
Re: 2.4 ohm
Bl: 10.36 Tm
Based on this project, which contains two driver 300w RMS each.
I would take the same project, and use only one driver.
How would the measures?
Considering the driver specifications:
Modelo 12SW3D6 12"
Pot. RMS: 300 WRMS
FS: 23.40 Hz
Qes: 0.347
Qms: 3.908
Qts: 0.318
Vas: 175.5 Lts.
Xmax: 13 mm
No: 0.631 %
Sens.: 90.02 W/m
Sd: 53.093 m²
Le: 1.9 mH
Re: 2.4 ohm
Bl: 10.36 Tm
Attachments
Hi,
If the design is any good, and I'm not saying it is, half the internal
depth dimensions and the front opening and leave everything else
as it is for one driver.
More succinctly half the effective CSA and volumes for one driver,
if you make it narrower don't reduce the depth so much. Having
said that the design doesn't look right to me, YMMV.
rgds, sreten.
If the design is any good, and I'm not saying it is, half the internal
depth dimensions and the front opening and leave everything else
as it is for one driver.
More succinctly half the effective CSA and volumes for one driver,
if you make it narrower don't reduce the depth so much. Having
said that the design doesn't look right to me, YMMV.
rgds, sreten.
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So I figured halve the measures of the original design.
Now, I am in doubt.
My idea would be so! (photo attached)
Considering the parameters of the drive, is it correct ?
Attachments
Hi,
It seems to be a correct length of the internal airways but the cross sectional areas don't suit your driver at all even if cut in half.
BTW. You have to completely re-design the two driver enclosure because the drivers are lined vertically not horizontally.
If the drivers had correct T/S parameters and if were paced horizontally you could have divided(vertically) the enclosure cut in two equal halves.
Have a look at the submitted picture where an OD-TL of similar length is shown at the bottom using your driver T/S.
This TL starts with an area(S1) equal to the driver Sd and is terminated with an area of Sd/3(= S4) and a total air-ways length of 16+255+16 = 287 cm counted from the S1 area ending at the terminating port(S4) . The FR is shown too.
Compare: IMO a much better use of your driver would be to convert the OD-TL to a T-TQWT= the rest of the simulations.
b
Attachments
Hi,
This is a DIY forum. Why not help yourself ....Here are a couple of hints on how to interpret the HR layout dimensions for one driver:
b
Attachments
Hi,
This is a DIY forum. Why not help yourself ....Here are a couple of hints on how to interpret the HR layout dimensions for one driver:
b
bjorno!
You are a man of good will to teach!
Makes two hours I'm racking my brain with its layout.
I apologize for my ignorance. But I'm learning from you.
And this is very good, therefore, does require a lot of intelligence.
About the size of the transmission line I understood.
Now do not get on S1, S2, S3 and S4. These measurements are in centimeters?
For the time being grateful for its lessons and dedication, but if you can help me!
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BJORNO!
Many thanks. But even so grateful!
I apologize for your time employee in my project.
However, I think this is all very gratifying.
Tell me one thing:
To calculate the size of the line, the correct calculation would be as follows:
row length = speed of sound / FS / 4
In our case would be>
row length = 344 / 23.80 / 4 = 3.613 cm
In the calculation made by softerware line length was 2.87 cm in
this is just a curiosity.
Another thing:
For graphical analysis box "T-TQWT", the waves were better than the OD-TL?
Many thanks. But even so grateful!
I apologize for your time employee in my project.
However, I think this is all very gratifying.
Tell me one thing:
To calculate the size of the line, the correct calculation would be as follows:
row length = speed of sound / FS / 4
In our case would be>
row length = 344 / 23.80 / 4 = 3.613 cm
In the calculation made by softerware line length was 2.87 cm in
this is just a curiosity.
Another thing:
For graphical analysis box "T-TQWT", the waves were better than the OD-TL?
Last edited:
Both are but when you draw imaginary sound rays as in # "1": This gives a false
impression that the sound travels through the Lid, it doesn't !
You have to detach= here remove the Lid in order to convert the T-TQWT into an OD-TL.
Corrected picture here:
b
Attachments
Bjorno, the question of T-TQWT, I get this straight.You'll receive answers to post # 13 no earlier than tomorrow, my time.
b
Let's talk only of the T-TQWT.
This cover you're talking about, is merely to maintain the driver. However, in normal circumstance, is closed? would that be!
As in the drawing?
Attachments
Yes! And if you remove the cover(Lid) you have an OD-TL as simple as that.
In OB-TL mode the In-Band FR sloops gently towards lower frequencies = sometimes handy to invoke if room boundary gain considered to high ( corner placements).
The summing of the driver and terminus will be in the far-field for a OD-TL( picking up boundary from the vicinity too) but a T-TQWT can be considered as a Omni-point-pressure-source with comparable low sensitivity for external boundaries interactions.
b
That lesson you gave me into a friend. I would like to understand the transmission line just like you! Tell me how you have any digital book?
As for the softer you use, would be fully trusted?
That same month I will make this T-suboover TQWT, and when you are ready, post here, with special thanks to you!
Thank you and I apologize for my impatience!
a hug
As for the softer you use, would be fully trusted?
That same month I will make this T-suboover TQWT, and when you are ready, post here, with special thanks to you!
Thank you and I apologize for my impatience!
a hug
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