Audio Dynamics speakers were designed to reproduce music with ultimate accuracy. They spent countless listening hours examining the tonal qualities of many different materials and ultimately decided transparent silk was the best material to use for the new 4000 series tweeter due to its extended frequency response and overall amazing detail. 
 
Specifications:
Highest quality transparent silk
1″ (25.4 mm) voice coil
Integrated hexagonal designed grill
Cast aluminum case
Optimal bandwidth: 3.5 kHz – 20 kHz
150 Watts RMS power handling
* All power ratings are figured using an electronic high pass crossover with a minimum crossover point of 3000Hz at 24dB/Octave, 3400Hz at 18dB/Octave, or 3700Hz at 12dB/Octave.
 
Tweeter Dimensions:
Outer Case Diameter 2" (50.2mm)
Flush Mounting Depth 5/8" (15mm) 
Flush Mounting Diameter 1 3/4" (43mm)
Flush Mount Protrusion 1/4" (6mm)
 
Tweeter T/S Parameters:
Fs 1742.000 Hz
Qms 1.672
Qes 3.498
Re 3.177 Ω
Le 0.050 mH
Z 3.8124 Ω
Qts 1.131