this may be a stupid Q on Spawn Family

[paba]

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

[badman]

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).

[planet10]

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

[Altecboy]

What are "anti-interference" blocks?

[planet10]

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

[Altecboy]

Thanks.

[HareBrained]

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.

 ----------
 | \
 |   \
 |     \
 |      |
 |      <
 |      |
 |     /
 |   /
 | /
 ----------

- John

[planet10]

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...



dave

[HareBrained]

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).

 ----------  }-- Port edge & enclosure end
 | \
 |   \         }-- Port Mouth
 |     \
 |      |
 |      |
 |      |
 |      |
 |    <(     }--- Driver
 |      |
 |      |
 |      |
 |      |
 |     /
 |   /        }-- Port Mouth
 | /
 ----------

[planet10]

OK, i get it... it should be doable...

dave