Celestion Contest Entry, Dual CF1840 TH

[sine143]

So Celestion recently hosted a speaker design contest (ended yesterday) for their CF1840JD 18" drivers.

now... overall, this driver looks like an ideal 40hz bassreflex dual 18, (volume aroune 375 liters) with a fairly low driver mass, but that seemed a bit too simple to win a contest, so I designed a dual tapped horn in about 4 days.

Its pretty big (no where near as big as a FLH would be for this cut off) but the results are decent, about 2 to 3 db in sensitivity advantage. dimensions (external) are 60w X 38d X 24h. limit is around 73 v.

Anyways... If I DO win... I'll probably just build bass reflex boxes, but it was a fun exercise in speed of design/fold with an unknown driver. 🙂

 

[Brian Steele]

Did the design call for the use of two of the drivers?

 

[sine143]

yep... required you use 2... thus, the behemoth.

 

[Zero D]

@ sine143

Hi & well done, looks good 🙂

Architechs Specs 😀

All the best with it 😉

 

[sine143]

yeah I kinda figure i'm doomed though cause IDK if Celestion will want to ship a prize to the USA lol.

 

[Zero D]

Why doomed ?

Celestion are also in the USA & have dealers there too 🙂

 

[sebDIY]

Interesting design, even if it's big. But why 2.83 volts 4 Ohms? It is two watts not one. It would make more sense to provide sensitivity at 1 watt so 2 volts 4 ohms.

 

[sine143]

Danley precedent. Post everything at 2.83v regardless of impedance

 

[Rik_bS]

I c a typo 😛

 

[sine143]

Exursion lol

 

[MartinQ]

Was just looking for info on this driver and found this thread. As an update, the contest winner is here with an f3 of about 45hz:
Build This! Dual Subwoofer - Celestion Speaker World


In depth review of the driver is here:
CF1840JD In-Depth Analysis and Review - Celestion Speaker World

 

[sine143]

yeah yeah, the contest winner uploaded a slightly modded version of his own design he's had publicly available on the web for years with no data.