A few insight from the Wolf von Langa Field Coil loudspeaker history. Above A594 - built between 2009 and 2011.
A594 - raw unit assembled - inspired by James B. Lansing Signature 375.
A154S - inspired by James B. Lansing Signature 150-4C.
A154 - inspired by James B. Lansing Signature 150-4C.