REAR PANEL
ON-OFF SWITCH: This switch turns the HA-6AB on and off. For convenience, it is recommended that the HA-6AB and any other rack-mount equipment be powered through a switchable outlet box, such as the Furman Sound PL-8 or PL-PLUS Power Conditioner and Light Module. The PL Series provides an easy way to power up the whole rack with one front-panel switch, and provides discreet illumination on dark stages and studios as well. If you do use a switchable outlet box, leave the HA-6AB’s on-off switch in the ON position at all times.
GROUND LIFT SWITCH: In many installations, hum-causing ground loops are formed by the common connection of various pieces of equip- ment to the power line ground, and by contact between chassis, as in a rack with metal rails. Sliding the Ground Lift switch up completely isolates all signal grounds from the chassis, breaking any ground loops. The chassis always remains connected to the ground pin on the AC cord for safety and to provide shielding against RF interference. Try both positions of the Ground Lift switch, and leave the switch in the position that results in the least hum in your system.
Note: The ground lift can be rendered ineffective by 3 pin audio connectors that tie pin 1 (signal ground) to the metal shell of the connector (chas-
sis ground). The connection from pin 1 to the shell is optional on all 3 pin connectors, and can be removed if present, by opening up the connector on the cable and disconnecting it.
SPEAKER A OUTPUTS: These outputs should be used when a pair of speakers is used as an alternative to headphones, since the headphones are switched off when the speakers are switched on. The connections are 5-way binding posts, which can accommodate dual banana plugs, bare wires, or wires terminated in spade lugs.
SPEAKER B SATELLITE/REMOTE OUTPUT: This output is a single male XLR connector con- taining both the left and right channel outputs. It is wired as follows: Pin 3-left (high); Pin 2-right (high); and Pin 1-low, common to both channels. This output should be used as the starting point for a chain of HR-2 Remote Stations (satellites). It will receive signal whenever the front panel SPEAKER B button is depressed. If necessary, it may also be used to connect a second set of speakers. However, if it is used for speakers, note that depressing the SPEAKER B button will not switch off the front panel headphone jacks in the way that the SPEAKER A button does.
INPUTS: Quarter-inch (mono) phone jacks are in- tended for line level signals such as the outputs of a mixer. Microphones and/or instrument pickups may not have strong enough outputs to drive the
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