4" Carpenter memory foam behide your speakers ???

If I may ask, what is carpenter memory foam?

its that foam thats used in many highend pillows for the most comfort for neck pain...foam that is squishy and then returns to its original form. You can get them at most bed,bath and beyond stores also targets and walmarts now carry them. You might be able to buy it in larger sheets.

PS the properties of the material make it hard to hang on the wall as the force of gravity might have a tendancy to deform the material over time.

Schipo-So it is the "Temper-pedic" (sp) bed foam- thank you.

Yes basically that's it. They come in all sizes and also very large style body pillows. I would think that the larger size body type could be made into a very good tube trap.