Impact high elastic bubble

border + thread side, 

Speakers with a better density

of magnets, so that the dB 

level is higher, up to 93dB,

low-power amplifier can be 

launched than the same size

speaker large volume; large

voice coil, water pots, water

pots hardness of course than

ordinary flat basin hardness

To be harder, so that the

vibration of the basin is less

offset; the use of screw-

shaped edge, the edge of the

thread from the United States,

the edge of the edge is the

speaker vibration amplitude is

very small vibration. Because

the low volume is by the horn

vibration basin, to encourage

the air flow inside the box, so

that the speaker basin

agitation of the air more.