Hey Lostcause, can you post a picture of the room and settee? That might help us picture what you're trying to do. 6" depth is definitely not a project killer.
By the way, depending on the settee, a front-firing sub might fire right through it reasonably well. We used to do that in cars, a classic Olds Cutlass in particular.
By the way, depending on the settee, a front-firing sub might fire right through it reasonably well. We used to do that in cars, a classic Olds Cutlass in particular.
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Bjorno
This one is looking favourite now as the others just wont fit.... and I like it😀
So now I just need to find an appropriate driver that's still available and calculate the box dimensions... this is going to take me some time unless one of you experts could help 😱...🙂
I have downloaded that software and had a few goes..... not for the novice this is it🙁
Cheers guys
Lee
Hi,
Here is a source for drivers:
http://www.lautsprechershop.de/pdf/wavecor/wavecor_sw178wa01.pdf
http://www.lautsprechershop.de/pdf/wavecor/wavecor_sw182bd02.pdf
=The Wavecor SW178WA01 8Ohm I used in the_TQWT and the Wavecor SW182BD-01 4 Ohm or SW182BD-02 8Ohm that also could be used with minor box adjustments, i.e. by adding 0.4cm to the width and 1.3 cm to the depth but keeping the box height constant. The dividing paned should be doubled = +1.6 cm.
The picture contains the wizard input for both drivers where it should be noted that the SW178WA01 has the T/S parameters after my burn in of the driver and typical burn in data is entered into HR for the Wavecor SW182BD-02 driver as well.
The gain of using the slightly larger driver is ~5 dB, almost doubling the possible sound output power: One SW182BD-02 T-TQWT = ~2 SW178WA01 T-TQWT's.
b🙂
Attachments
Thanks bjorno, thanks for the work you've done, very much appreciated.
I'll do some drawings to make sure I've got it right but I'm not too sure about the divider dimensions. If I use the alternative driver, you say double the divider.. so it's 32mm thick ?
Cheers
Lee
OK here's a draft sketch.... not sure of the divider length and the bottom fold width (drawn @ 50mm)
EDIT: This is in 18mm MDF....
EDIT: This is in 18mm MDF....
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OK.. worked out the fold width to get the right horn length... still not sure of the divider though.....
Your drawings looks good but you forgot to slant the dividing panel a bit as the CSA:s should have ~ Parabolic tapering from S1 to S4.
b 🙂
Attachments
keep trying
Thanks bjorno, thanks again for your input.
I've revised the design to accommodate the S1 & S4 area you have. I have not shown the support braces on this one yet though.
Talking of the support braces; do these not reduce the internal volume and therefore change the tuning? Could I put thicker support braces in and reduce the divider/baffle?
I have sunken the magnet into the back panel a little more so that I can use a 25mm divider/baffle. This is a material width I can readily buy.
What do you think?
regards
Lee
Thanks bjorno, thanks again for your input.
I've revised the design to accommodate the S1 & S4 area you have. I have not shown the support braces on this one yet though.
Talking of the support braces; do these not reduce the internal volume and therefore change the tuning? Could I put thicker support braces in and reduce the divider/baffle?
I have sunken the magnet into the back panel a little more so that I can use a 25mm divider/baffle. This is a material width I can readily buy.
What do you think?
regards
Lee
Hi Lee,
You've done a great job..
As long there is enough of clearance behind the driver magnet: at least ~1/2 to 1" for both the suggested types of drivers counted from the coil ventilation hole to the wood, its quite OK.
Of course, you're' right again : It would be far easier to use 25 mm wood for the divider instead of the proposed 2 16 mm panels.
They do reduce the volume but to a lesser extent that easily can be counteracted with the impact from damping material.
So when using thin wood like <= 1/2" wood, the volume loss can be ignored but if you choose thicker material for bracing it's wise to include the volume of bracing when calculating the required cross sections volumes.
b 🙂
Hi Lee,
You've done a great job..
As long there is enough of clearance behind the driver magnet: at least ~1/2 to 1" for both the suggested types of drivers counted from the coil ventilation hole to the wood, its quite OK.
Of course, you're' right again : It would be far easier to use 25 mm wood for the divider instead of the proposed 2 16 mm panels.
They do reduce the volume but to a lesser extent that easily can be counteracted with the impact from damping material.
So when using thin wood like <= 1/2" wood, the volume loss can be ignored but if you choose thicker material for bracing it's wise to include the volume of bracing when calculating the required cross sections volumes.
b 🙂
Thanks bjorno, you've been an inspiration!
I've included 1/2" braces and Dacron fill as per your original design as well
Now I wait for the driver to arrive and I may have an early Christmas present
I too am looking at the SW182BD Wavecor woofer mated to Wavecor WF182BD woofer and TW030WA07 tweeter in a tower speaker resembling the Focal Electra (see link below).
http://www.excelia-hifi.cz/focal/focal-electra-1000-2.pdf
http://focal-reproduktory.cz/focal-electra-1000.pdf
I discussed this on another thread but got no response
http://www.diyaudio.com/forums/multi-way/138121-woofers-working-together-3db-6db-2.html
How good is the Wavecor WF182BD woofer compared to even their own WF182BD woofer or other 7" woofers in the same price range?
Does it more sense to use 3 SW182s mated to a single WF182?
or
3 WF 182s mated to a smaller WF 120BD or 152BD midwoofer?
I removed the stuffing extending beyond the fold, thus only half-ways is quite sufficient.
....Waiting for the 'as built' pictures...😀
PS: BTW: Do you have any means to take measurement when finished?
b🙂
Hi Navin,
A lot of questions...Really don't understand what you worry about.
Here are my take on towers:
I dislike Phantom that hangs down that isn't centered at the ear-height.
Hang-down effects(phantom spread mirroring with the floor) is very well known to occur.
Cure:
Never XO above 145 Hz(LR4): Concerning the driver next to the floor.
Drivers that are XO:d at or above ~250 Hz should be placed as high as possible.
b🙂
a little help...
Hi Bjorno,
I'm trying to model the Wavecor SW182BD- in HR with your data, but I got a
"invalid TH data"...😕
Could you help ?😀
Thx !!
This design looks good to me : WAF is hard today !!
Cheers.
Hi Bjorno,
I'm trying to model the Wavecor SW182BD- in HR with your data, but I got a
"invalid TH data"...😕
Could you help ?😀
Thx !!
This design looks good to me : WAF is hard today !!
Cheers.
😱
never mind... I found my mistake...
BTW, how many Watts did you give to this baby ?
And you model it 0.5pi ?
Cheers.
never mind... I found my mistake...
BTW, how many Watts did you give to this baby ?
And you model it 0.5pi ?
Cheers.
(Eg)^2/8 (W)...I modeled in 0.5xPi but sometimes it's wise to use 1.0xPi if the T-TQWT is placed far away from room corners.
b🙂
There's always this
SW26DAC76-8 - SB Acoustics shallow 10 inch subwoofer - Europe Audio
from SB acoustics, expensive, but then again it is a proper 'sub' driver and designed specifically for narrow installations.
SW26DAC76-8 - SB Acoustics shallow 10 inch subwoofer - Europe Audio
from SB acoustics, expensive, but then again it is a proper 'sub' driver and designed specifically for narrow installations.
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