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The Rega Mira 3 Amplifier is a high performance audio amplifier
using the Improved “type 3” Rega Alpha-Encoder control
system comprising of high quality loss-less relays, plus a digitally
controlled analog switched resistor network volume control. The
Mira 3 is housed in the Rega custom-built extruded aluminium case
incorporating a high thermal efficiency heat sink. Rega has kept
the same level of performance and synergy between stages as in the
original Mira 2000 amplifier with a better level of functionality
& controllability in the volume control user interface.
The Mira 3 is a 60 Watt integrated amplifier with full flexibility
within the range. It has a Pre-amplifier output and Power amplifier
input. The gain of the power amplifier is 28dB for full output,
and thus enables the amplifier to be expanded to drive Bi-amplifier
or active speaker systems (Sub Bass etc). It can also drive multiple
speakers if required or be part of a high performance AV system.
The amplifier has a fully short circuit and DC protected output
stage and high quality Evox film capacitors have been used in the
signal path throughout.
Volume control
The volume level is controlled via a microprocessor, which in turn
takes its information from the volume digital encoder on the front
panel or remote control handset.
The volume control has a resolution of 1dB per step, giving a total
range of 80 steps over the available gain or volume range of 80dB.
There is a calibrated LED display comprising of 20 LED's, which
indicates the gain level or relative position of the volume control;
this is calibrated in 4dB steps, across the total gain of volume
range. The left and right channels are matched and balanced within
0.2dB, ensuring a centrally placed soundstage no matter what the
volume position or which gain level has been set.
The stepped resistive networks of the volume control are placed
in the feedback and input circuits of the ic based line amplifier,
thereby optimizing the gain of the line amplifier for a good signal
to noise ratio. Also, the stepped resistive network provides the
amplifier input with constant input impedance, providing the source
component (CD, tuner, tape etc) with a constant impedance load and
eliminating the possible changes in sound quality with different
volume control positions.
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