Eminence 18 Scoop

Sorry for reviving this thread but I'm studying a bit more the eminence scoop. Should be stupid but how much is the compression chamber? If I calc the vtc where this end so when horn start to expand really, it reaches about 100 liters without driver. am I wrong?

I would calculate the volume of the chamber ignoring the throat opening.

bitzo wrote: Sorry for reviving this thread but I'm studying a bit more the eminence scoop. Should be stupid but how much is the compression chamber? If I calc the vtc where this end so when horn start to expand really, it reaches about 100 liters without driver. am I wrong?

EDIT: Wow, have learnt a lot since originally posting this.. :lol:

Removed estimate of this being "approx 67L" chamber, as is more likely to be around 80L.

Seems large, however know of another scoop with similiar chamber and throat, and with tmax 1200 it pounds, still being in control with 1kw input.

I'm trying to convert a 68 cm wide emi scoop into a 60cm one

the big width is what makes it work

ok but if you enlarge the height of the horn section you'll have the same area however I have to play some more

Lev gave me the link to this drawing and I drew it up because someone was complaining about negative expansion

the out come was that the schematic was right and the sizes were a typo error, so lots of peeps are using the Emi scoop with neg expansion because of a silly printing mistake :lol:

don't you just love audio smiley20

mykey- wrote: Lev gave me the link to this drawing and I drew it up because someone was complaining about negative expansion

the out come was that the schematic was right and the sizes were a typo error, so lots of peeps are using the Emi scoop with neg expansion because of a silly printing mistake :lol:

don't you just love audio smiley20

Well, if it works... :lol:

levyte357 wrote:

mykey- wrote: Lev gave me the link to this drawing and I drew it up because someone was complaining about negative expansion

the out come was that the schematic was right and the sizes were a typo error, so lots of peeps are using the Emi scoop with neg expansion because of a silly printing mistake :lol:

don't you just love audio smiley20

Well, if it works... :lol:

:lol:

but what could we have built with the pointless extra wood inside.... a stand for their cabinet design books?

bitzo wrote: Prototyping is the definitive way to learn but a bit expensive for just an hobby.

Bitzo, have an idea.

Take a look at this "original" Eminence 18 scoop plan.


[attachment=0:2lf9csma]<!-- ia0 -->original_emmy_scoop_plan.JPG<!-- ia0 -->[/attachment:2lf9csma]

When this cab is built H48", W24", 29"D, with approx 5" gap below rear baffle + corner bracing/deflectors, it gives stunning performance with these drivers and many similiar,

PD1850
V18-1000
PD186

Maybe you could draw this up and sim it, and I can tell if your sim results tally with real world observations.