Active Compliance Management (ACM) Patent Pending
ACM is a unique hybrid design that combines the attributes of direct radiating and band-pass configurations to reduce distortion and optimize amplitude and phase response
hs-28 Dual 18 inch ACM Subwoofer ? VUE Audiotechnik
Sounds like they are using some type of Positive Feedback arrangement, as in ACEBass etc to alter the T/S.
From the specs i saw, it's not as effecient, nor produces as much SPL as some designs we're familiar with ! Still, i havn't heard it, so it "might" sound ok ?
Is HR capable of simming this ?