file Eminence 18 Scoop

8 years 7 months ago #12427 by bitzo
Replied by bitzo on topic 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?

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8 years 7 months ago #12429 by tony.a.s.s.
Replied by tony.a.s.s. on topic Eminence 18 Scoop
I would calculate the volume of the chamber ignoring the throat opening.

Peace and goodwill to all speaker builders

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8 years 7 months ago #12431 by levyte357
Replied by levyte357 on topic Eminence 18 Scoop

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.

\"When in Vegas, do as the vegasians do\".

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8 years 7 months ago #12434 by bitzo
Replied by bitzo on topic Eminence 18 Scoop
I'm trying to convert a 68 cm wide emi scoop into a 60cm one ;)

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8 years 7 months ago #12435 by saul
Replied by saul on topic Eminence 18 Scoop
the big width is what makes it work

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8 years 7 months ago #12436 by bitzo
Replied by bitzo on topic Eminence 18 Scoop
ok but if you enlarge the height of the horn section you'll have the same area however I have to play some more

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8 years 7 months ago #12437 by mykey-
Replied by mykey- on topic Eminence 18 Scoop
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

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8 years 7 months ago #12440 by levyte357
Replied by levyte357 on topic Eminence 18 Scoop

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:

\"When in Vegas, do as the vegasians do\".

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8 years 7 months ago #12441 by mykey-
Replied by mykey- on topic Eminence 18 Scoop

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?

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8 years 7 months ago #12579 by levyte357
Replied by levyte357 on topic Eminence 18 Scoop

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.

\"When in Vegas, do as the vegasians do\".
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