Rega Research Mira 3 Owners manual
Mira 3 manual.qxd 10/12/2002 11:24 Page 1
Introduction.............................................................................1
Design Innovation...................................................................2
Installation..............................................................................3
Ventilation...............................................................................4
DC and Short Circuit Protection.............................................5
Pre-amp Output and Power-Amp Input...............................6
Input Connections...........................................................7-9
In Use..............................................................................10-12
Loudspeakers & Cable.........................................................13
Bi-amping....................................................................14
Specifications...........................................................15
Troubleshooting.....................................................16-20
Input sensitivity and pre-amp gain level................................21
Owners Log...........................................................................22
Contents
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Your REGA amplifier has been designed to reproduce music
effectively and easily. The Mira 3 has been built to Rega’s
discriminating standards of reliability and quality to ensure many
years of musical enjoyment.
An amplifiers function is to boost the tiny signal generated by a
cartridge, CD player, or other source so that it can drive the
loudspeakers. It is vital that the amplifier achieves this without
changing the signal, which would distort the music. We have avoided
superfluous gadgets such as tone controls or a headphone socket as
they obstruct the signal path and degrade the produced sound
quality.
The REGA amplifiers incorporate remarkable and innovative design
ideas. For those interested in the technical details, these innovations
are described more fully in this manual.
Alternatively, you can simply switch on, sit back, and let your amplifier
speak for itself...
Introduction
1
Mission Statement
Rega’s philosophy is to make high quality products at sensible prices, as a means
of reproducing music as faithfully as possible. Rega is committed to the design
and development of new and existing products, both in hi-fi and other areas, that
will perpetuate Rega’s values of quality and value for money.
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In common with all REGA products, the Mira 3 amplifier has been
designed without compromise. Our time and money has been spent
on developing the unique circuit design and using unusually high
quality components. However, we have included new useful features
not seen on REGA amplifiers of this price before.
The Mira 3 amplifier has digitally controlled analog switched
resistor network volume control.
The Mira 3 features REGA designed circuitry, developed inhouse with the aid of CAD circuit simulation, computer modeling and
extensive listening.
The Mira 3 has an internal switch to link the pre-amplifier
and power amplifier, giving total flexibility within the REGA range;
highly uncommon for amplifiers of this price.
The Mira 3 includes extremely high quality components not
normally found in an integrated unit. These include high tolerance
polypropylene capacitors, advanced output transistors, and a large
toroidal transformer.
Design Innovation
2
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The Mira 3 will work well on most surfaces, such as a shelf or a table,
provided there is sufficient air around it to prevent overheating.
To avoid magnetic interference, site the Mira 3 as far away from the
turntable as the tonearm lead will allow. If possible, place it to the left
of the turntable.
Keep other equipment, such as tuners, cassette decks or CD players
away from the amplifier. Never stack other hi-fi components on top of
the Mira 3.
Due to the layout of Rega's amplifier circuit designs, they are virtually
insusceptible to Electro Magnetic interference, and by virtue of the
extruded aluminium case, emit practically no Electro Magnetic
radiation.
However, placing any electronic equipment close together may
impair the performance of one or both of the items.
Installation
3
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The heat produced by the Mira 3 is dispersed to the air via the case,
particularly from the extruded heatsink. Ensure that the case has an
unobstructed air passage around it.
Never place the amplifier on carpet, rugs, bedding or other hi-fi
equipment.
Note: If the Mira 3 is driven at high volume for a long period, it will
become quite warm. This is entirely acceptable and as long as there
is sufficient ventilation, the amplifier will continue to work quite
normally.
Ventilation
4
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The Mira 3 has a circuit which protects the speakers from direct
current in the event of a major failure of the system.
Short Circuit Protection
If in the event that the speaker leads are shorted, the fold back short
circuit protection will protect the output stage from excessive
currents. This innovative REGA protection circuit is not placed in the
audio signal path and therefore does not affect sound quality.
DC Protection
5
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Pre-Amp Output and Power-Amp Input
The Mira 3 has a pre-amplifier output & power-amplifier input, giving
total flexibility within the REGA range.
The pre-amplifier can drive at least 5 power amplifiers, sub bass units
etc, and the power amplifier can be used with most pre-amplifiers.
There is an internal link via a DIP switch between the pre-amp output
and power-amp input which can be turned off by moving the DIP
switch to the OFF position. If you are using only the pre-amp stage of
the Mira 3 in conjunction with a separate power-amplifier you may
want your dealer to move the switch to the off position.
The pre-amp outputs and power-amp input use RCA type (phono)
connectors.
Any adjustments made to the power amp link switch and gain must
be carried out by a authorised Rega dealer.
If work is carried out by any person other than a Rega dealer it will
invalidate your warranty.
6
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