Operating instructions

EUROBLOCK CONNECTIONS

Insert the wires, and then snug down with the set screw. The entire barrier strip can be removed for

quick service without disconnecting the individual wires.

SIGNAL LEVELS

Signal levels from -10dBu to +4dBu are considered normal with maximum levels of approximately

+22dBu balanced or +16dBu unbalanced. Do not connect microphones directly to the equalizer. Most

Microphones, as well as instrument pickups, require a preamp to get the signal level up to a line level.

The outputs of the equalizer are also designed to connect into line level inputs and should not be

connected into sensitive Microphone or Instrument Inputs for best results.

CHASSIS GROUNDING

The equalizers are equipped with a rear panel Ground Lift switch. This should normally be set to the

Ground position. After set up, if your system exhibits excessive hum or buzzing, the problem may be

a due to a ground differential between your equalizer and other equipment in the same system. The

Ground Lift switch lets you try several combinations to minimize system hum.

NOTE: ALWAYS TURN YOUR AMPLIFIERS DOWN BEFORE CHANGING GROUNDS.

Try different combinations of lifting grounds on units that are supplied with ground lift switches or

make sure all chassis are connected to earth ground, either through the AC Power cord ground or by

the front panel rack mount screws.

If the HD series equalizer is mounted in a grounded rack of equipment, the ground to the case of the

equalizer may be lifted to prevent multiple ground paths, which may cause a ground loop to occur.