used.
Referring to FIG. 21, the electro-dynamic loudspeaker 100, according to the prior art, typically includes a voice coil 102, a magnet 104 and a cone 106. The voice coil 102 is an electrical conductor, and is placed in the magnetic field of the magnet 104. By applying an electrical current to the voice coil 102, a mechanical vibration of the cone 106 is produced due to the interaction between the electromagnetic field produced by the voice coil 102 and the magnetic field of the magnets 104, thus producing sound waves by kinetically pushing the air. However, the structure of the electric-powered loudspeaker 100 is dependent on magnetic fields and often weighty magnets.
Thermoacoustic effect is a conversion between heat and acoustic signals. The thermoacoustic effect is distinct from theand so I missed her light. Here was this unbelievably strong woman, who was pregnant with their third child when he was arrested for abusing her niece, now raising three girls on her own. Just by being with her and the girls made me realise I needed to be brave too, I needed to testify. It was the very least I could do. And so I answered the phone and before I knew it I was staying in a bare little hotel room across from the police station, terrified of what was to come.

During those days, memories played like films on repeat in my head. Late night drives with my arm dangling out the window, a cigarette dangling out of his mouth and my favourite songs playing too