The pipe with the new 53mm straight lengths comes a little short of the planned box enclosure end……
I’d calculated the ‘missing’ 57.5mm length based upon the centre path of the diameter having a diameter of 95mm……
The pipe itself has a diameter of 85mm
So, the actual pipe itself will need an additional 42.5mm either side of the path it follows………..
Which means, a new sketch………Something like this.
- R47.5 is the 95mm diameter of the centre of the pipe
- R90 is the outer diameter of the 85mm diameter pipe
- 10 is the thickness of the speaker enclosure
Finally, we have at least one outer enclosure dimension sorted! – 200mm – Err, that’s a bit bigger than planned! – The speaker itself is only 98.2mm diameter……Looks like some more iterating needed, BUT, now I understand the dimensions, I can experiment a little with the Tube’s cross sectional area and therfore diameter…….
In hindsight, the speaker enclosure dimension was fairly obvious…….
- enclosure thickness ( 10mm ) +
- Transmission Line Diameter ( 85mm ) +
- enclosure thickness ( 10mm ) +
- Transmission Line Diameter ( 85mm ) +
- enclosure thickness ( 10mm ) +
= 200mm!
The smallest enclosure possible has a Transmission Line area the same as the speaker – i.e.
- SD of 28.3 gives a Diameter of 6cm….
- 10mm + 60mm + 10mm + 60mm + 10mm
Smallest possible size = 150mm
More fun to follow………..
Lets look
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