Dayton Audio's ND25FN-4 is a versatile 2.54cm (1") diameter tweeter for use in DIY applications requiring smooth, clean treble reproduction. The treated silk dome diaphragm provides excellent detail and smoothness, while the high-resistance neodymium magnet provides high efficiency in an extremely compact size. The rear-mounted heatsink and ferrofluid-filled magnetic air gap provide enhanced heat dissipation for reduced power compression at high levels. This model is ideally suited for installation within a horn (waveguide) or on a custom mounting plate.