| gychang |
GM states:
"Tangband W3-871S 3" full range - Designed by GM
L = (Line length) 70"
Zdriver = Driver 15.2" down from sealed end of cabinet
Sm = 22.5"^2
Due to the high Fs and driver position, floor loading recommended"
I am estimating following inside dimensions:
height:35"
width: 4"
length: 5.5"
speaker: 15.2" from open top
what I don't understand is, "floor loading"...
thanks,
gychang |
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| gychang |
does the "floor loading" mean, the open end, usually located on the top in the BIB cabinet is actually on the bottm?. Is there a detail drawing on how the bottom should be "exposed"?
gychang |
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| edjosh23 |
I've build a BIB for my w3 871s. Here is my webpage . Honestly, haven't heard them yet. I left to go to college so i never finished painting them and gluing the suprabaffle. They look good atleast...
Here is a picture of the cabs unpainted.
My plans are on my website also.
Thanks,
Josh
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| gychang |
Josh:
I enjoyed the pictures, thanks, I learned what is meant to be "floor mounted". I predict the sound will be good. Let us know how it sounds.
thanks,
gychang |
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| edjosh23 |
Since I'm at school, I won't be home before the semester ends except for Thanksgiving, so perhaps late December i can finish them up.
Josh |
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| gychang |
| quote: | Originally posted by edjosh23
Since I'm at school, I won't be home before the semester ends except for Thanksgiving, so perhaps late December i can finish them up.
Josh |
I received the speakers yesterday and I will use your figures/dimensions, but will be waiting for sound opinion from u.
gychang |
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| gychang |
I have built with Cyburg Needles with the same speaker, and thinking about building BIB per GM's recommendation on his site.
I am not sure if anyone has heard of this combo. Wonder if the base wil be better in BIB...
gychang |
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| Scottmoose |
Now let me take a guess -you're thinking about building a BIB for the Tang Band 871, right? ;)
Yup, invert them. Cut away the rear panel at an angle to allow it to vent properly, as it'd be a trifle difficult for it to vent if its physically sitting on the floor. A nice block of wood to the rear like a post will prevent them from falling over. Best to let them angle backward slightly though as the driver position is necessarily very low as-is.
However -with these cabinets, you could actually lift the driver to a better position 29.125in from the sealed end, which will improve the response -this is actually closer to being the 'ideal' position for the driver, but it can't normally be done with upward firing BIBs as it'd put the driver practically on the floor. And inverting taller BIBs would put it about 3 1/2ft over your head. But it can be done for short, inverted BIBs like this. Gives less ripple.
An alternative is not to fold them at all. Build a box 70in tall, upward-venting, with a sloping internal baffle. Mass load the half of the cabinet you don't use with sand or something similar. Again, use a driver position 29.125in from the sealed end as we can still use that. Job's a good 'un. |
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| gychang |
| quote: | Originally posted by Scottmoose
Now let me take a guess -you're thinking about building a BIB for the Tang Band 871, right? ;)
An alternative is not to fold them at all. Build a box 70in tall, upward-venting, with a sloping internal baffle. Mass load the half of the cabinet you don't use with sand or something similar. Again, use a driver position 29.125in from the sealed end as we can still use that. Job's a good 'un. |
Scott, I want to build BIB with TB 871.
I want to build upward venting (tall ash tray as my wife calls it). I don't understand the rest of the statement. I gather.
1. driver 29" from the floor (sealed end).
2. do I need an internal baffle as in "regular BIB"?
3. does the Sm remain same?, like slim and deep, recommend size?
4. does the top (which is vented) remain same Sm size as the sealed end?
thanks,
gychang |
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| Scottmoose |
| It's not difficult to understand. It's just a tall cabinet open at the top, a sloping baffle dividing it into two sections, the rear section being unused and sealed off, preferably filled with something to stop it resonating. WxD remain unaltered. See rubbish drawing attached. |
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| gychang |
| quote: | Originally posted by Scottmoose
It's not difficult to understand. It's just a tall cabinet open at the top, a sloping baffle dividing it into two sections, the rear section being unused and sealed off, preferably filled with something to stop it resonating. WxD remain unaltered. See rubbish drawing attached. |
great stuff, u gave me an idea, how about just legs behind the speaker as support? (forgot how to draw straight line in photoshop...)
Sm: 22.5: W:4, L:6 too big?
gychang |
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| Godzilla |
Straight line in Photoshop.
Simply click on the brush tool. Click where you want the line to begin. Hold down the shift key and click where you want the line to end.
Easy.
Looking forward to how you solve the upside down BIB stand. |
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| gychang |
| quote: | Originally posted by Godzilla
Straight line in Photoshop.
Simply click on the brush tool. Click where you want the line to begin. Hold down the shift key and click where you want the line to end.
Easy.
Looking forward to how you solve the upside down BIB stand. |
I used to know these things... Age sucks.
gychang |
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| Scottmoose |
| Should be interesting. |
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| gychang |
For Sm= 22.5
W:4, L:6", is this close enough?
thanks,
gychang |
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| Scottmoose |
| Should do. It's not ideal, but the differences will be relatively minor. |
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| gychang |
| quote: | Originally posted by Scottmoose
Should do. It's not ideal, but the differences will be relatively minor. |
as we say in the States, much obliged.
gychang |
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| Scottmoose |
| No worries -we're all here to help each other. I'll look forward to seeing how they work out. Stroop already has a pair like this (albeit somewhat taller) for his FE108ESigmas and loves them. |
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