It might be easier to go with a full range ribbon and cross over at 200Hz to the NS15s.
The 1616m would have enough outputs to allow CUDA FIR processing for every transducer.
In addition, since the mass of the ribbon is negligible, a viscoelastic damping layer between the CF panels should minimize any resonances present.
The only issue would be dealing with the off-axis response since the baffle width will have to be non-negligible.
9" baffle + magnetic circuit + 9" baffle
For the ribbon,
320 1" x 1/2" x 1/4" N52 magnets should suffice (BX084-N52 @ K&J magnetics)
K&J Magnetics - Products
A 1/2" x 80" 10 micron length of aluminum foil should have a resistance around ~.5ohm
Would any of the Pass Class A amplifiers be able to drive a .5ohm impedance?
Aussieamplifiers has some very interesting options. I believe Shinobiwan used them in his reference design. The HPA-nxV200 is able to drive 2ohm loads. 4x HPA-nxV200s could be bridged together to drive a .5ohm impedance.
If this isn't an option, the foil could be segmented into 4 elements, laminated to Teonex, and connected in series for a ~2ohm impedance.
Any thoughts on where to purchase a quantity of C1010 steel? 4x 8' bars would suffice.
The 1616m would have enough outputs to allow CUDA FIR processing for every transducer.
In addition, since the mass of the ribbon is negligible, a viscoelastic damping layer between the CF panels should minimize any resonances present.
The only issue would be dealing with the off-axis response since the baffle width will have to be non-negligible.
9" baffle + magnetic circuit + 9" baffle
For the ribbon,
320 1" x 1/2" x 1/4" N52 magnets should suffice (BX084-N52 @ K&J magnetics)
K&J Magnetics - Products
A 1/2" x 80" 10 micron length of aluminum foil should have a resistance around ~.5ohm
Would any of the Pass Class A amplifiers be able to drive a .5ohm impedance?
Aussieamplifiers has some very interesting options. I believe Shinobiwan used them in his reference design. The HPA-nxV200 is able to drive 2ohm loads. 4x HPA-nxV200s could be bridged together to drive a .5ohm impedance.
If this isn't an option, the foil could be segmented into 4 elements, laminated to Teonex, and connected in series for a ~2ohm impedance.
Any thoughts on where to purchase a quantity of C1010 steel? 4x 8' bars would suffice.
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Maybe that's the wrong approach. The best thing about carbon fiber is it doesn't stretch. A solid, rather than a soft, core might raise the resonance beyond audibility. Just throwing ideas out, of course. You won't really know 'til you try. But that's the fun of experimenting with something different.
I've just learned the carbon fiber is Hexcel im7-a552
http://www.hexcel.com/NR/rdonlyres/BD219725-D46D-4884-A3B3-AFC86020EFDA/0/HexTow_IM7_5000.pdf
density = 1.78 g/cm^3
tensile modulus = 276GPa
tensile strength = 5310MPa
flexural modulus = 152GPa
flexural strength = 1862MPa
coefficient of thermal expansion = -0.64 ppm/*C
thermal conductivity = 5.4W/m-*K
specific heat = .21 Cal/g-*C
fiber volume = 60%
http://www.hexcel.com/NR/rdonlyres/BD219725-D46D-4884-A3B3-AFC86020EFDA/0/HexTow_IM7_5000.pdf
density = 1.78 g/cm^3
tensile modulus = 276GPa
tensile strength = 5310MPa
flexural modulus = 152GPa
flexural strength = 1862MPa
coefficient of thermal expansion = -0.64 ppm/*C
thermal conductivity = 5.4W/m-*K
specific heat = .21 Cal/g-*C
fiber volume = 60%
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