1986-1988 Signature, version 1
Same cabinet shape as Qln One but with rounded edges instead of 45 deg edge at front baffle. The entire baffle is covered by wool felt.
1989-1991 Signature, version 2 (Rubber surround and convex dust-cap)
First version of Signature with larger cabinet size.
Woofer from Scan-Speak with yellow Kevlar cone, coated textile convex dust-cap and rubber surround.
1992-1994 Signature. Version 3 (Coated foam surround and convex dust-cap)
Change of surround from rubber to coated foam. New constant impedance crossover.
1995-2003 Signature. Version 4 (Rubber surround and inverted/concave dust-cap)
Updated woofer with new low loss surround, improved magnet system and new inverted/concave dust cap.
From around 1998 new bas tube with rounded edge.
1994-1995 Signature HD II
Same cabinet as ”Signature” (with the yellow cone). New woofer with a black carbon fibre cone and new tweeter.
1996-1999 Signature HD II (ver2)
Updated tweeter and woofer.
1996-1999 Signature HD II Split Field
Signature HD II with an external crossover in separate box. First with metal box but later on with a wooden box.
1999-2002 Signature Typ II
New cabinet shape with slanting top. New woofer Black Kevlar cone with phase plug and new tweeter. Produced in a smaller amount most are sold outside Sweden.