Lexicon NT Series Amplifiers User Guide Models 212, 312, 412, 225 and 501
Unpacking and Inspection After unpacking the amplifier, save all packing materials in case you ever need to ship the unit. Thoroughly inspect the amplifier and packing materials for signs of damage. Report any shipment damage to the carrier at once; report equipment malfunction to your dealer. Precautions Save these instructions for later use. Follow all instructions and warnings marked on the unit. Always use with the correct line voltage.
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Contents Introduction Overview .................................................................................... 1 Models 212 and 225.................................................................................. 2 Model 312 .................................................................................................. 2 Model 412 .................................................................................................. 3 Model 501 ...........................................................
Lexicon NT Series Amplifiers Congratulations on your purchase of a Lexicon amplifier. Your amplifier has been designed and manufactured for absolute linearity and stability. Utilizing a unique Quad-Complementary output stage, the NT Series amplifers produce less distortion than even Class A designs, with higher efficiency and better long term reliability.
Lexicon NT Series Amplifiers Overview Models 212 and 225 The 212 stereo amplifier consists of 2 amplifier modules, each with its own power supply. The channels may be operated independently (1=left; 2=right) for stereo at 120 watts/channel @ 8Ω, 200 watts @ 4Ω, or bridged (monaural) to form a single 400 watt amplifier into 8Ω. The 225 stereo amplifier provides 250 watts/channel @ 8Ω, 400 watts @ 4Ω, or it can be bridged (monaural) to form a single 800 watt amplifier into 8Ω.
Lexicon NT Series Amplifiers Model 412 The 412 power amplifier consists of 4 independent amplifier modules, each with its own +55V power supply, and 4 custom power transistors for a total of 16 output devices. The 412 can be configured to drive 2, 3 or 4 speakers: 4 channels at 120 watts into 8Ω, or 2 channels at 120 watts plus 1 channel at 400 watts, or 2 channels at 400 watts. This provides complete flexibility in any present or future audio or video system.
Lexicon NT Series Amplifiers Installation Selecting the appropriate installation location for your amplifier is perhaps the single most important factor in ensuring a long trouble-free service life. Although the amplifier is very conservatively designed, you must provide some airflow around the unit. If you intend to stack multiple amplifiers in an enclosed space, you should consider installing a fan or otherwise assuring adequate airflow around the amps, as they rely on convection cooling.
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.
Lexicon NT Series Amplifiers Operation Front Panel LEDs All amplifiers in the Lexicon NT Series are equipped with sophisticated comparator circuits which detect sources of signal distortion including clipping, excessive DC or supersonic signals, and short circuits in the cabling. Multifunction LEDs on the front panel are provided to alert you to various operational states of the amplifier.
Lexicon NT Series Amplifiers Wire multiple amplifier triggers in parallel. Common “zip cord” wire is adequate. (If you find that using audiophile cable for the trigger signal sounds better, feel free to use it, just don’t tell anyone else.) The pin outs on the CP-3PLUS and DC-1 series have appropriate signals available via the rear panel DIN connectors. Pin 1 is ground and Pin 3 is +5V. (On the DC1, Pin 3 may be +12V, depending on an internal jumper configuration, but either 5V or 12V will work.
Lexicon NT Series Amplifiers Specifications Models 212,312,412 120 Watts per channel @ 8Ω, 200 watts @ 4Ω Bridging channels yields 400 Watts @ 8Ω Model 225 250 Watts per channel @ 8Ω, 400 Watts @ 4Ω Bridging channels yields 800 Watts @ 8Ω Model 501 500 Watts @ 8Ω, 800 Watts @ 4Ω S/N >110dB IM + THD <0.01% Input Sensitivity Input Impedance Slew Rate Damping Factor Radiated Interference Polarity Controls and Indicators Connectors General 1V for 28.
Lexicon Inc. 3 Oak Park Bedford, MA 01730 Tel 781-280-0300 Fax 781-280-0490 www.lexicon.
