Inside/Outside Voice Coil.

The motor of the SRS1500's LF transducer uses an extremely high-flux magnet structure and special 3-inch inside/outside wound voice coil. This bears some explaining.

A speaker voice coil is an electromagnet consisting of copper wire wound onto a round "former." When you put lots of power through wire, it gets hot. If it gets too hot, the voice coil croaks. The wire can burn out, or toast the voice coil former, or melt the adhesive attaching it onto the former... and fly off like a crazed copper slinky. All of these things happen all too often to conventional subwoofer transducers because of the way voice coils are traditionally designed (see drawings below, with wire diameter exaggerated for clarity). Note that two layers of wire are stacked on top of each other on the outside of the voice coil former (Drawing A1).

The only way voice coil wire can cool off is to dissipate heat to the air and surrounding magnet. But because the wire in an LF transducer must be wound two layers thick, the bottom layer makes no contact with the outside air - so terrific heat builds up. This can lead to catastrophic failure (Drawing A2).

Drawings B1 and B2 show the inside/outside voice coil design used in the SRS1500. One layer of wire on the outside of the former and one layer of wire on the inside. Both layers make full contact with the air, transferring heat to both surfaces of the magnet structure. Maximum cooling takes place. The LF transducer can stand ten hours running flat out at a rave in a 100°F warehouse. Or worse.

In addition, this inside/outside configuration creates a sandwich (wire/voice coil former/wire that is far more mechanically strong and less likely to part company during heavy use.

Bottom line: the SRS1500 LF transducer can handle the full power load of its amplifier constantly without burn-out. In fact it can theoretically handle power up to the point of glowing red hot - and adding to your lighting effects.