High Power Systems Based On Millennium - LC audio Millennium User Manual

High Power Millennium Systems.
A basic Millennium amplifer is designed to run on a 33-0-33 V transformer and put out 120
Watts in 8 Ohms / 240 Watts in 4 Ohms. By adding an extra set of power transistors on an
ext. Module, You may use the Millennium at higher power levels or lower impedances
(right down to 1 Ohm). One extra set of output devices will let the unit run on a 40-0-40 V
transformer and provide 180 Watts in 8 Ohms / Two extra output modules will give You
350Watts in 4 Ohms. 3 Extra sets will give 250 Watts in 8 Ohms / 500 Watts in 4 Ohms
with a 50-0-50 V transformer..
The extra output devices are placed on an ext. Module that also contains emitter resistors
and appropriate bypassing caps to secure stability.
Instead of higher voltages the impedance with the latter system may be sustained at 33-0-
33 V (AC) and more than 800 Watts are available in 1 Ohm loads.
Due to the risk of sound quality deprivation we do not recommend parallelling output
devices that are goind to reproduce treble / midrange frequencies. Parallel devices have
small differences that will result in high order (very audible) distortions, heard as
aggressive sound at high volume levels. The solution is to have separate outputs for bass
and treble/mid. However this requires the speakers to be bi-wirable. Most speakers have
this feature today. One set of output devices drive the treble/mid output, while a number
of additional sets enforces high current output in the bass output where high-order
distortion is removed by the speaker filter.
Separate output terminals are standard issues in out kits of 180W or higher. (Except the
Balanced versions where no parallel output devices are used anyway).
The End Millennium
Ext. board with an extra set of output devices plus emitter resistors and
bypassing caps .Up to 3 ext. Boards can be connected to one main board
using power and signal in/out wires.
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L C Audio Technology