[. . . ] CITATION a madrigal audio labs company CITATION 7. 0 TO ADP 303 HOOK-UP INSTRUCTIONS The following are some specific instructions to connect your Citation 7. 0 A/V Controller with the Harman Kardon ADP 303 digital decoder. [. . . ] You should configure the 7. 0 A/V Controller to also use the mono sub-woofer output. If your system uses two Subwoofers, connect a "Y" adapter to the sub out of the ADP 303 to drive left and right sub-woofer channels. The ADP includes high pass filters which are engaged on the back of the unit. For most speaker configurations, switch this "speaker mode" setting to "small" on all channels. The "small" position should be used for all Citation speaker combinations. Too high of a bass level will cause your sub-woofers to "POP" or worse, damage your subwoofers. Start the level in the full counter clockwise position and slowly raise it to the desired bass level. 3. CALIBRATION The calibration of the ADP 303 is performed independently of the Citation 7. 0 A/V Controller. [. . . ] This is necessary if both side and back channels of the 7. 0 are used in the system. [. . . ]