MHB-46

yes you're right, it doesn't make much difference in this design

also your volume, I drew this up in Autocad, and the internal volume of the rear chamber should be nearly spot on

@JJD, have you reduced for the volume of the driver has taken up?

with a standard 18'' ferrite magnet I normally use 11 litres, say 9 for a neo

the internal cone volume of a 18'' driver is roughly between 4-4.5 litres


the rectangular throat area is 22.2 x 36 x 1.8 = 1.43 litre

baffle hole/excursion plate is 42.2 dia 21.2 x 21.2 x 3.142 = 141 x 1.8 = 2.53
cone volume, 4/4.5 litres

4.5 + 2.53 + 1.43 = 8.46 litres for throat chamber volume

very little in the graph anyway between the two

I have updated the Full Size Plan with the latest revision of the design.

Sensitivity: 105 dB 1w/1m (half space 2pi)

Also check hornplans.free.fr/mhb46.html for some build pics and a lot of other designs.

Yes I have reduced volume of the driver. RCF say 5.5 liters for front mounting on 18mm thick board: www.rcf.it/fr_FR/c/document_libr ... E-2219.pdf

The 22.2x36 area is not throat chamber, it is the start of the horn.

nice to see a plan only for italian driver :lol:
however... JJD the rcf value for the cone don't fit in this case you have to add the baffle cutout volume. However don't change so much.

cheers jjd it was l8t lol...... i had my sleepy head on after the weekend. sorry guys for the wrong plot... smiley13

bitzo wrote: nice to see a plan only for italian driver :lol:
however... JJD the rcf value for the cone don't fit in this case you have to add the baffle cutout volume. However don't change so much.

I have a lot of Italian friends here, and when I tell them that Italy make the best speakers they end up wit a big smile on their face smiley4

hi all

i have simmed different drivers in hr.iam getting weird phase resp
this is with 18lw1400.rcf18g401 is also giving the same.
resonant masked path difference 0.


thanks

ravs



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