Lexicon NT Series Amplifiers
Lexicon amplifiers do not require any specialized line conditioners, as they have special power supply circuitry designed to reject power line problems like line spikes, surges and RFI. Simply plug each amplifier directly into a line socket. In areas where there is a high likelihood of lightning strikes or other potentially catastrophic surges, additional protection may be warranted. Verify that any surge protection device you choose has ample power conducting capabilities. High power installations may benefit from a review of your electrical service to ensure that adequate power is available and to minimize the chance of ground loops.
Amplifiers rated for 120V may be used only on a 60Hz line.
Complete all audio input and output connections and make sure that the front panel power switch is in the OFF (out) position before connecting the AC power cord.
Never make or break any connection unless power to the amplifier has been disconnected. Unless you are bridging channels, make sure the mode switch adjacent to the input is set to individual.
Gain level is automatically matched to the type of input used when you select the unbalanced (RCA type connectors) or balanced mode (XLR or 1/4") with the rear panel switch.
Use high quality speaker cables of at least 16 gauge. For runs longer than 3 meters, thicker (lower AWG#) cable should be used. The total loop resistance of the speaker wire should be less than 0.1Ω. Consult your dealer for specific recommendations.
All input and output connectors are gold plated and should be used with high quality cable with gold plated connectors for optimal
One of the biggest challenges in large audio and video systems is minimizing the audio hum caused by a “ground loop”. Raising the amplifier rear panel Ground Lift switch to its up position puts a 10Ω resistor in series between the system ground and the chassis ground. The chassis is still grounded.
This may reduce the hum. Do NOT leave the ground lifted if it does not make a difference.
Often hum is caused in A/V systems through connection to cable TV cables or other equipment which are at a different ground potential. Addressing this at the source is the most efficient path to a clearer, quieter system.
Power
Requirements
Audio
Connections
Ground Lift Switch
The Ground Lift Switch does not disconnect the chassis from the third prong on the power cord which must be left intact for safety reasons.
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