1 cu ft sealed sub design

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Bill poster

Bill poster

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Joined 2008
#1
Work in progress design for a 2 part moulded enclosure. The plate amp is mounted at the rear.

Dimensions
Diameter 44cm Height 42cm(2cm off the underside to create a flat)
Depth 31cm.
Not sure if to use the SB 10" or the Dayton RSS265HF. 241012_1.jpg
 
#5
Well, what is the Q of the two drivers mentioned in that volume. Very small for a sub. Model it and see which works better.

Why the cost of CF or kevlar? Are you planning on launching it? How thick? Half an inch? Any internal core?
 
#6
Its just one driver with the amp plate mounted at the back, dimensions are 44x31cm atm. I'm making it in Thailand so the costs of composites are less than UK. The thickness is only a few mm and curvature makes it very stiff but I would brace if needed
 
#7
How about a 1 cu foot enclosure with a 10" driver on each horizontal face? (4 of them) And about a 50% fill of activated coconut charcoal (with a good desiccant like 'molecular sieve') which should essentially double the internal compliance? That's something I might try if I was into that type of SW.
 
#8
looks hard to make that shape

I have worked allot with both CF and Kevlar in my high power rocket building endeavors (in a past life).
I must say, the shape that you are going to try looks quite hard to do.
You may want to make a styrofoam core, cover it and melt the styrofoam out with Acetone.
I built a custom nosecone that way.
Anyway, good luck.

It looks like it will be a fast sub😀

fusterCluck12-15-01.jpg


Bob Evans farm in the backround
Dave
 
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#9
Not easy but I'll get the shape RP'd in 2 pieces then take a mold off - I love laying up carbon fibre, it stinks but its more fun than working in MDF

btw those rockets look great fun

Coconut charcoal?? I'll look into it 😉
 
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#10
All this concern with building a round box, but nothing on modeling the driver in a volume to determine which driver is best suited, if either, for this box. Then no discussion of building a conventional prototype to confirm the design before embarking on an exotic build. Please, work through the design in the right order.
 
#11
thoriated said:
How about a 1 cu foot enclosure with a 10" driver on each horizontal face? (4 of them) And about a 50% fill of activated coconut charcoal (with a good desiccant like 'molecular sieve') which should essentially double the internal compliance? That's something I might try if I was into that type of SW.
Click to expand...

I guess you have not had the time yet to study the relationship of T/S parameters and how it relates to a box volume. I really encourage you do do a bit of background reading, or show me a 10 inch sub driver that can work in a quarter cubic foot. One foot is pretty small for a SINGLE 10 inch drier. No stuffing identified so far is going to give more than about 10 to 15% volume equivalent. A Q of 2 and massive eq does not a high fidelity system make. Sunfire proved that.
 
#12
either the RSS265HF or SB acoustics SW26DAC76-4 both work well just under 1 cuft sealed but will probably got for the Dayton; rough calculations inc amp, driver and some bracing internal vol comes out around 25litres

I've modelled about 50 drivers
 
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