Go to their site- it explains everything there, but.
The ACS stands for "Adcock Cross Section", and is the term that O. L. has applied to his extraordinary bow limb design. The CX stands for "Carbon Extreme", because the limbs utilize carbon fiber facing and backing. It is, however, neither the facing and backing material nor the limb's core materials which, in large measure, sets the ACS CX's performance apart from other bows. It is the limb's design; the Adcock Cross Section.
A&H - i believe was for OL Adcock and Larry Hanify co-owners (could be wrong)
just click on their link up above
jer Bear