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A honeycomb acoustic unit is provided, the unit comprising first and second honeycomb layers, the layers being made of honeycomb core, each being formed by metallurgical bonds, and a deformable septum having two opposing sides, the first and second honeycomb layers being metallurgically bonded to th

A honeycomb acoustic unit is provided, the unit comprising first and second honeycomb layers, the layers being made of honeycomb core, each being formed by metallurgical bonds, and a deformable septum having two opposing sides, the first and second honeycomb layers being metallurgically bonded to the two opposing sides of the deformable septum.

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1. A honeycomb acoustic core unit, said unit comprisinga first layer of metal honeycomb core, a deformable metal septum comprising first and second sheet stock surfaces, and a second layer of metal honeycomb core, said first and second layers of honeycomb core each being formed from a metallic foil

1. A honeycomb acoustic core unit, said unit comprisinga first layer of metal honeycomb core, a deformable metal septum comprising first and second sheet stock surfaces, and a second layer of metal honeycomb core, said first and second layers of honeycomb core each being formed from a metallic foil sheet assemblage with a plurality of weldments distributed between the foil sheets, said deformable metal septum being metallurgically bonded at each of its first and second sheet stock surfaces to each of said first and second honeycomb core layers, respectively, said acoustic core unit being useful for sound attenuation. 2. The acoustic core unit of claim 1 wherein said plurality of weldments distributed between said foil sheets of said assemblages are laser weldments.3. The acoustic core unit of claim 1 wherein said first and second honeycomb core layers are each made from at least one material selected from the group consisting of titanium and its alloys; stainless steel alloys; nickel based alloys; non-ferrous alloys; carbon steels; and alloy steels.4. The acoustic core unit of claim 1 wherein said metallurgical bonds between said septum and each of said first and second honeycomb cores are selected from the group consisting of brazing, liquid interface diffusion bonding, diffusion bonding, soldering, laser welding, resistance welding, and friction welding.5. The acoustic core unit of claim 1 wherein said first and second honeycomb cores are each formed of titanium foil sheet assemblages with laser weldments, said septum is titanium, and said septum is bonded to each of said first and second honeycomb core layers by brazing.6. The acoustic core unit of claim 1 wherein said unit is deformable.7. The acoustic core unit of claim 1 wherein said deformable metal septum is perforated.8. A method of making a honeycomb acoustic unit comprisingproviding a first honeycomb layer and a second honeycomb layer, each of said first and second honeycomb layers being formed from a metallic foil sheet assemblage with a plurality of weldments distributed between the foil sheets, providing a deformable metal septum having two opposed sheet stock surfaces; metallurgically bonding said first honeycomb layer to one sheet stock surface of said septum; and metallurgically bonding said second honeycomb layer to the opposite sheet stock surface of said septum, said resulting unit being useful for sound attenuation. 9. The method of claim 8 wherein said plurality of weldments distributed between said foil sheets of said assemblages are laser weldments.10. The method of claim 8 wherein said first and second honeycomb core layers are each made from at least one material selected from the group consisting of titanium and its alloys; stainless steel alloys; nickel based alloys; non-ferrous alloys; carbon steels; and alloy steels.11. The method of claim 8 wherein said metallurgical bonds between said septum and each of said first and second honeycomb cores are selected from the group consisting of brazing, liquid interface diffusion bonding, diffusion bonding, soldering, laser welding, resistance welding, and friction welding.12. The method of claim 8 wherein said first and second honeycomb cores are each formed of titanium foil sheet assemblages with laser weldments, said septum is titanium, and said septum is bonded to each of said first and second honeycomb core layers by brazing.13. The method of claim 8 wherein said unit is deformable.14. The method of claim 8 wherein said deformable metal septum is perforated.15. The method of claim 14 wherein said perforations are present in said septum prior to being bonded to said core layers.16. The method of claim 14 wherein said perforations are provided in said septum after said septum is bonded to at least one of said honeycomb layers.