Aurum Cantus Aluminum Ribbon Tweeter G3 Si $199 for the pair. RRP $399

"Aurum Cantus is a trusted name when it comes to ribbon tweeters, and leads the industry with its neodymium-driven ribbon technology. Each tweeter utilizes a lightweight, pure aluminum diaphragm to provide great high-end extension, exceptional detail, and quick transient response. The G3Si utilizes a longer ribbon length for improved low-end response and higher sensitivity."

Technical data:

Rated impedance: 6 Ω
Rated power: 50 W
Sensitivity: 99dB/w/m
Frequency range: 1400Hz－40KHz
Dimension of aluminum ribbon(WLT): 8.5mm×100mm×0.01mm
Shape of aluminum ribbon: wave
Moving area of aluminum ribbon: 850mm2
Gap flux: 0.6 Tesla
Frequency cut recommended: over 2300Hz
Material of mounting faceplate: aluminum, CNC processing, surface with anodizing electroplating finish.
Dimension of mounting faceplate: W74×H140×T4mm
Outside dimension(WHD): 74×140×77
Weight: 1.33kg/pc

Full specs available from here

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