Is it possible to create XV Ice

Here is an interesting article: http://www.wired.com/wiredscience/2009/09/sn_icexv/

Based upon what I'm reading, for it to exist ice XV must be maintained at very low temperature and very high pressure. It is also extremely dense. Which suggests to me that if it were to be placed into your enclosure and then allowed to warm up to say, room temperature, the speaker would probably explode with considerable force. This strikes me as a Bad Thing.

Have I missed something?

Definitely, it is impossible to understand what you tried to describe. Cavity filled with water and ice XV? Both together? What is the purpose of filling this cavity with a very dense material? Absorption? Reflection? I think there is a number of other simpler, less expensive and widely available options to consider, even if you wish to build a completely transparent device. As already said here, you may use fiberglass. With the correct resin, it becomes transparent. BTW, you stated "this amorphous kind of ice..." - all ice types are "amorphous" in this way, i.e., do not retain a specific structure at large scale (meaning, something like 0,1 micron... hehehe).

Only three are amorphous; the rest of the 16 are crystalline in some way or another. The densest is Ice X at 2.51, versus Ice XV at 1.30.

Snowflakes are larger than 0.1 microns, and rather clearly crystalline rather than amorphous.

I too would like to know more about what the OP really has in mind.

Thanks for the tips. The problem is that I am used to deal with steel. For me, amorphous and crystalline structures are a bit different things... I think I was caught by that hydrogen bridges...

"How is it possible to replicate conditions in this manner to create this amorphorus Ice." Let's just say that it isn't practical, now, outside the laboratory.

What property of ice xv makes it desirable for your application?

And, although I've been around speakers for a while, I've never heard the word carcass used in any context other than to describe something that is dead and useless. Please enlighten me.

I am curious and impressed by your manufacturing plant. Not many facilities can reach these temperatures and pressures. Please tell me more - I am fascinated.

Thank you all very much for your answers and for giving me a gentle cuff to the back of my head. The reason for the ice was to create a very dense material for the speaker. Quite rightly i completely forgot about heat transfer although that can be achieved. I was wondering if ther was more light to be shed. As i do work for a high audio outlet it is just as well i have an alias, and the fact that i attend LSBU, will try and find my way over to the laboratory...thanks for your time.

ps. is there material that morphosis to that of ice, as this is theme of the speaker which will be made of glass