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Old 11th May 2009, 08:52 PM   #1
paba is offline paba  Canada
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Default this may be a stupid Q on Spawn Family

Hi all,

these double horn cabs... spawn family.... would it be completely wrong to close the horn openings with speaker cloth? Like does that stop the air flow and the whole point of horns? Or is it just like speaker cloth in front of a driver... i.e. some loss but still acceptable?

Just trying to see if the WAF could be improved that's all.

thanks
paba
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Old 11th May 2009, 11:10 PM   #2
badman is offline badman  United States
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Perfectly acceptable, though you can expect some 'flap' if you're cranking the right kind of tunes (probably run out of driver Xmax or powerhandling before this is an issue though).
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Old 11th May 2009, 11:19 PM   #3
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Default Re: this may be a stupid Q on Spawn Family

Quote:
Originally posted by paba
these double horn cabs... spawn family.... would it be completely wrong to close the horn openings with speaker cloth? Like does that stop the air flow and the whole point of horns? Or is it just like speaker cloth in front of a driver... i.e. some loss but still acceptable?

Just trying to see if the WAF could be improved that's all.
Another possibility that has been mentioned, but no-one that i know have has tried, is to mount the drivers on the back and make that the front. Then the ports are rear-firing. Many of the spawn are deep enuff that this will affect the way they play in a room, and any midrange leakage thru the port will be obscured (just saw that mentioned wrt a Jaguar build). You will also need to use 2 triangular port "anti-interference" blocks, 1 above & 1 below the driver.

dave
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Old 12th May 2009, 03:45 PM   #4
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Default "anti-interference" blocks?

What are "anti-interference" blocks?
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Old 12th May 2009, 04:09 PM   #5
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Default Re: "anti-interference" blocks?

Quote:
Originally posted by les winter
What are "anti-interference" blocks?
A freshly invented term for the triangular shaped piece(s) on the back that prevent a direct path from one slot vent to the other.

dave
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Old 12th May 2009, 04:11 PM   #6
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Thanks.
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Old 12th May 2009, 08:32 PM   #7
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Default Re: Re: "anti-interferaence" blocks?

Quote:
Originally posted by planet10


A freshly invented term for the triangular shaped piece(s) on the back that prevent a direct path from one slot vent to the other.

dave
Would it be OK if we spelled it "anti-interference"? I hate those squiggly red lines under my words.

Related to this topic, I was wondering what are the critical aspects of the Spawn BVR enclosures? I look at them and see these huge empty triangles at either end. What if the woofer volume shape incorporated the angles (see profile ASCII art below)? Or would this result something bad? The advantage would be a smaller overall size.

Code:
 ----------
 | \
 |   \
 |     \
 |      |
 |      <
 |      |
 |     /
 |   /
 | /
 ----------
- John
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Old 12th May 2009, 08:55 PM   #8
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My horrid typing skills strike again

The voids at top and bottom are artifacts of a predominantely rectangular box world we live in.
They can be left out or can be used as part of a woofer enclosure, filled, or whatever creative uses you want to put to them.

Here is a variation on the theme...

Click the image to open in full size.

dave
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Old 13th May 2009, 07:11 AM   #9
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Cool Sketch-Up diagrams. Wish I had half those skills.

But I don't think you understand what I'm asking. Instead of a rectangular woofer volume, it's trapezoidal and the ends are horizontal. What concerns me is that the port throat is at the points of the trapezoid. The effect on the Lotus BVR would be to decrease the overall height by ~9" (~height of one port mouth).

Code:
 ----------  }-- Port edge & enclosure end
 | \
 |   \         }-- Port Mouth
 |     \
 |      |
 |      |
 |      |
 |      |
 |    <(     }--- Driver
 |      |
 |      |
 |      |
 |      |
 |     /
 |   /        }-- Port Mouth
 | /
 ----------
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Old 13th May 2009, 07:15 AM   #10
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OK, i get it... it should be doable...

dave
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