Lexicon 312 Manuel D’Utilisation

3

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 8

Ω

, 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.

With 4 discrete channels available, the 412 is an excellent choice to bi-amplify
your audio or video system, either actively using an electronic crossover, or
passively,  using  independent  connectors  for  the  high  and  low  frequency
drivers.

The 501 power amplifier consists of 2 amplifier modules, each with its own +60V
power supply and 8 custom power transistors, for a total of 16, or 32 per stereo
pair. The 2 modules can be configured in either Series or Parallel* mode to form
a single mono power amplifier capable of up to 800 watts. The Series mode
connects the modules in a bridged configuration. The output voltage swing is
thus additive, and is appropriate for driving loads from 3-8

Ω

. Parallel mode

yields the voltage swing of a single amplifier module, but the current available
is additive, and is appropriate for driving loads from 1-3

Ω

.

* As the impedance ranges describe 

nominal, not minimum, impedance, it is almost never advisable

to use Parallel mode for direct connection to a speaker. Parallel mode is generally only useful when
abnormally low impedances (1

Ω

 or less) are created from parallel wiring of multiple speakers.