Thread: Cornu horn built as a sub. Crazy idea?

That is my sub pictured on my site. I had the 15mm glass top cut to order with a cutout for the vol/xover controls.

The glass is sitting on a rubber "gasket" and stuck down with a rubber adhesive used for car windscreen installations. The glass top can be removed for any "maintenance". The drivers are mounted in on a removeable panel which is attached from behind. See the drawing on the website. The seal peels of and new sealer is used to reattach.

Originally Posted by soundman

crokey you should be able to get 100 to 150 litres out of a coffee table no problems.

The amount of litres is not really relevant UNLESS the specific design calls for such a size. You can obtain fantastic bass from very small boxes eg 25-30 litres.

I agree. The volume of the two sealed chambers where the drivers are were calculated according to the t/s parameters of the 10" drivers which came out to just over 30 litres each.

Yup modern sub design's have miniaturized the big boxes of yesteryear.
The 10" Kicker square sub in my car only needs 20ltrs sealed, starts rolling off at 45Hz... and being in a hatchback the resonance starts boosting around 50Hz, she's pretty well flat down too 30Hz(tested).

Very true that many of the bass cabinet designs these days are very compact.
But there is a price to be paid....... efficiency.

lots of the hifi drivers I see these days have efficiencies in the 80db/W at 1 metre range..... 89 is considered sensitive..... a good pro driver or a hi fi driver of some time ago would have a sensitivity in the high nineties, perhaps breaking the 100.

This is why alll these huge amps are needed these days.

add to that the other price to be paid.... high frequency resoponse.
Most of these modern bass drivers have such heavy cones coverd in so much dope that you are flat out getting 1Khz oyt of them
so you ahve to have your three way system with a sub as as well.

100 to 120 litres is a good sized box for a traditional 12" hi fi driver or a pro 15".
I have a design that takes two 400 watt ( rms real ones) 15 inch drivers, that goes 220 litres and gets to -3db @ 35 Hz, with a sensitivity arround 95db/watt at 1m. two of these is plenty for 250 seat at tables room.
and it will run two way to a large format horn crossed at 2KHz if thats waht you want.

Half that design would go into a 110 litre coffee table quite nicely. stick 200watts up its tail & that will be enough bottom end for most mortals.

Yep 100 to 150 litres is very relivent.







if you are serious.

cheers

" But there is a price to be paid....... efficiency."

Yup, thats why there's 350wrms driving the car sub, the amp has a "2gauge welding cable" for power directly from the battery(120amp fuse at the battery incase of an accident))
Efficiency is easier to get around in a home/car environment... totally opposite to Prosound.

" Most of these modern bass drivers have such heavy cones coverd in so much dope that you are flat out getting 1Khz oyt of them
so you ahve to have your three way system with a sub as as well."

Yup#2, although a decent 2 way optimised to run with a sub works good... hopefully needing only a low order Xover between them!