Mira 3 manual.qxd 10/12/2002 11:24 Page 1 Contents Introduction.............................................................................1 Design Innovation...................................................................2 Installation..............................................................................3 Ventilation...............................................................................4 DC and Short Circuit Protection.............................................
Mira 3 manual.qxd 10/12/2002 11:24 Page 2 Introduction 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.
Mira 3 manual.qxd 10/12/2002 11:24 Page 3 Design Innovation 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.
Mira 3 manual.qxd 10/12/2002 11:24 Page 4 Installation 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.
Mira 3 manual.qxd 10/12/2002 11:24 Page 5 Ventilation 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.
Mira 3 manual.qxd 10/12/2002 11:24 Page 6 DC Protection 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.
Mira 3 manual.qxd 10/12/2002 11:24 Page 7 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.
Mira 3 manual.qxd 10/12/2002 11:24 Page 8 Input Connections All the inputs and the tape outputs are made via RCA (phono) type connectors. The sockets on the REGA amplifiers are clearly marked red and white. Right: always the lower row and marked in RED. Left: always the upper row and marked in WHITE. IMPORTANT: ALWAYS TURN OFF THE AMPLIFIER WHEN CHANGING LEADS, ESPECIALLY SPEAKER CABLES.
Mira 3 manual.qxd 10/12/2002 11:24 Page 9 Phono Input The Mira 3 can be used with moving magnet (MM) or high output moving coil (MC) cartridges. Earthing Earthing is done via the Phono socket ground for Rega turntables so a separate earth is not necessary. In the unlikely event that your tonearm needs to be earthed to the amplifier, the grounding tag may be connected to the case grounding screw above the input sockets. See Rear Panel Connections drawing (page 7).
Mira 3 manual.qxd 10/12/2002 11:24 Page 10 Tuner Input The tuner input is suitable for use with most types of AM/FM tuners. Line Inputs The Line inputs enable the connection of additional sources, such as a second tape machine, tuner, video recorder etc... Tape Input/Output Almost any tape machine can be used with your Mira amplifier, including compact cassette, video cassette, reel to reel, DAT, and DCC.
Mira 3 manual.qxd 10/12/2002 11:24 Page 11 In Use Power switch & power LED Volume Indicator LED’s Mute switch/ Dimmer function Tape switch Ph ono CD Tape Lin e1 Mu te L ine2 Mira Remote sensor Tun er Heatsink Volume Control/Input selector Switching On The Mira 3 is turned on by depressing the power switch on the left of the control panel. The LED in the power switch will glow red. After several seconds you may hear a gentle click.
Mira 3 manual.qxd 10/12/2002 11:24 Page 12 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 the volume range. The left and right channels are matched and balanced within 0.
Mira 3 manual.qxd 10/12/2002 11:24 Page 13 Input Selection The Input selector is combined with the volume control. To select your input, push the control knob in once. You are now in Input selection mode. You have eight seconds to choose your input. (When the eight seconds are up the control knob will return to the volume function). The inputs are selected by turning the knob to the required input.
Mira 3 manual.qxd 10/12/2002 11:24 Page 14 Loudspeakers The Mira 3 amplifier is capable of driving all normal hi-fi loudspeakers. (Most loudspeakers have a nominal impedance of 8 Ohms). If driving loudspeakers of unusually low impedance (4 Ohms or less), ensure that you check with your dealer for compatibility. Loudspeaker Cable We recommend using good quality cable such as our own, or similar types made by other quality hi-fi companies.
Mira 3 manual.qxd 10/12/2002 11:24 Page 15 Bi-Amping With the use of additional power amplifiers, the Mira 3 integrated amplifier can be used in a bi-amping system, in conjunction with suitable speakers. This system can also be made active by the use of a suitable cross-over unit. Use both pre-amp outputs into a stereo power amplifier, or the right and left outputs into individual mono power amps, to drive bass/midrange; and the speaker outputs on the integrated amplifier to drive the tweeters.
Mira 3 manual.qxd 10/12/2002 11:24 Page 16 Specifications Input Specification (61W into 8Ω) Note - Factory setting of gain range level 2 CD/Tuner/Line 1/Line 2/Tape input sensitivity: 220mV. Load 10KΩ. Phono input sensitivity (moving magnet): 2.1mV. Load 47KΩ. (in parallel with 100pF) Power amplifier input sensitivity = 818mV. load 24KΩ. Pre-Amp Output level (with rated input levels) 818mV @ 470Ω. power amplifier gain = 28.
Mira 3 manual.
Mira 3 manual.
Mira 3 manual.qxd 10/12/2002 11:24 Page 19 Troubleshooting (Power on, sound from one speaker only) Are the connections between the speakers and the amplifier secure and functioning correctly? NO Correct the fault by plugging them in. If the wires are loose or not correctly soldered, contact your Rega dealer YES Are both channels of the speaker connected and working properly? NO Check the source component for faults.
Mira 3 manual.
Mira 3 manual.
Mira 3 manual.qxd 10/12/2002 11:24 Page 22 Input sensitivity and pre-amp gain The Mira 3 amplifier sensitivity or pre-amplifier gain can be set to three different levels; this is performed by putting the amplifier in to a programming mode on turning on the amplifier. Please note the amplifier is set to normal sensitivity (level 2) in the factory, this setting being suitable for all normal Hi-fi requirements.
Mira 3 manual.qxd 10/12/2002 11:24 Page 23 Owners Log (1) Owner....................................................................................... Date.......................................................................................... Where Purchased..................................................................... .................................................................................................. (2) Owner.......................................................................
