Spec Sheet Preview: The power supply/amplifier shall be Alpha Communications® / S.T.R.™ model VCU6, or approved equal. Amplifier shall operate from a 16VAC (40VA) AND a 12VAC (20VA) U.L. Listed transformer (T1640 and T1240 respectively). All wiring to power supply/ amplifier shall be low-voltage Class II wiring, installed as per all federal, state, and local electrical codes. Power supply/amplifier shall surface mount right to the finished wall and shall be installed in a suitable environment that is free from excessive dirt, dust, tempera …