Scanspeak D3806/820000 Mid Tweeter - Classic Range
Upper midrange unit for Spendor SP1/2.
Featuring the unique Symmetrical Drive (SD-2) motor system with copper capped pole piece, a 38mm critically treated soft textile dome and a low resonance damped rear chamber. Optimised for the upper midband, this superbly engineered unit conveys excellent depth of detail and resolution.
Symmetrical drive is a system incorporating copper caps / sleeve around the pole piece - this effectively forms a very low impedance shorted turn (called a Faraday ring) within the magnet circuit, the net result being that the tweeter voice coil impedance remains largely constant across it's operating frequency range, resulting in a more linear output with greater top end extension.
A very highly regarded unit capable of true high end results.