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SB Acoustics SB26STAC-C000-4 Tweeter

Spec sheet: SB26STAC-C000-4 PDF

1″ Textile Dome
Frequency Range 2000Hz to 25,000Hz
4 ohm Impedance
91.5dB Efficient
100mm Linear Response Metal Face Plate (3.94″)
Low Reflection Tuned Rear Chamber
Foam Gasket Attached 

Advanced Features

Cast aluminium faceplate
Copper cap for reduced voice coil inductance and minimum phase shift
Non-reflective rear chamber with optimized damping for improved dynamics
Flow optimized vented pole piece for optimum coupling to rear chamber
Fine weave soft fabric dome for smooth frequency response
Saturation controlled motor system for low distortion
CCAW voice coil for low moving mass
Long life silver lead wires
Low resonance frequency

The SB26STAC-C000-4 has been recommended as a very good replacement for the Allison Model AL 120 tweeter.  The outside diameter, cut out and terminal positions are all compatible to the original tweeter.  The customer also did measurement comparisons and found them to be a good match in both frequency and impedance.