Single ID CTX 12" sub won't be sufficient in the ANHC. Myself auditioned ID CTX single sub sealed in my NHC. It is a rocking sub, great SQ, Bass response pretty good, but output/loudness is too low on a single sub. Two ID CTX is awesome, IMO.
__________________ NHC Gxi | Kenwood KDC-MP 6539U | Image Dynamics CTX 6.5 | JBL GTO 937 | JBL CS1204T | Blaupunkt GT4MKII | Eclipse XA 1000 |