Recommended crossover frequency is 3000 Hz, 24 dB Linkwitz-Riley.
Impedance is 5 ohms and sensitivity is 90 dB at 1 meter with 2.83 volts.
In cabinet frequency response with crossover network is +/- 1.5 dB to over 40 kHz.

The 0.5 inch thick aluminum face plate is a 150 degree wave guide that greatly reduces cabinet edge diffraction!
The ribbon is 22mm behind the cabinet face for excellent time alignment with a 5.25 or 6.5 inch woofer.

The face opening is 30 mm x 30 mm so it has a radiation pattern similar to a 28 mm dome tweeter.
The emissive ribbon area is 15mm wide by 30mm long + 12m long suspension on each end to eliminate fatigue failure.

The rear chamber is 3 inch deep by 2.5 inch wide to absorb the rear wave without reflections and for a low resonance frequency.
It is aperiodic damped with 21 mm thick real wool felt.
The water fall decay and impulse response are excellent! 

The face is 3.5 inch tall by 5.25 wide by 0.55 thick, 0.25 inch corner radius.
Cabinet cut out hole is 2.875 inch high by 4.0 inch wide.
The magnet assembly is 4 inch deep and 4 inch wide.
Weight is 2.3 kg.

The transformer is internal.
It has good magnetic shielding and can be within 12 inch of a CRT television

All parts are cast aluminum and have a black powder coat fine texture finish.

We are trying very hard to make this the best tweeter in the world!