Myryad mi 120 User manual

mi 120
Remote Controlled
Stereo Intregated Amplifier
Owner’s manual
Myryad Systems Ltd
2 Piper’s Wood
Waterberry Drive
Waterlooville PO7 7XU
Tel [phone]
Fax [phone]
[email protected]
For further information,
please contact
Myryad direct or visit:
www.myryad.co.uk
MI 120 Integrated Amplifier
English MI 120 ok 29/1/01 10:17 am Page 2

3
rear panel
connections
1Power inlet
Before making any connection, check that
the mains voltage setting printed on the rear
panel is the same as your local mains supply.
Plug the female (socket) end of the power
cord into the power inlet on the rear of the
amplifier. Plug the male (plug) end of the
cord into a “live” wall socket or a suitable
heavy duty extension cable.
UK version: The mains plug is supplied fitted
with a 5A fuse. It should only be replaced
with a fuse of the same rating (5A) which
complies with BS1362.
2Power switch
Press one side of this rocker switch (the side
nearer the edge of the rear panel) to switch
the amplifier ON and the other side (towards
the speaker terminals) to switch it OFF. When
the POWER switch is in the OFF position
all power is disconnected from the amplifier.
In this condition the amplifier cannot be
powered up from the front panel or the
remote control. When the POWER switch
is in the ON position (and the power cord
correctly inserted and plugged in to a live
wall socket) the amplifier will power up
in standby mode (see FRONT PANEL
CONTROLS, STANDBY, page 5).
It is recommended that the POWER switch is
turned OFF if the amplifier is not going to be
used for an extended period of time.
3My-link input/output
When the MI 120 is used in a system with
other Myryad products all may be joined
together via the My-Link. This will allow
all the different products to be remotely-
controlled via the infra-red receiver on the
MI 120. My-Link offers two benefits. Firstly,
only the MI 120 infra red receiver needs to
be in “line-of-sight” from the remote handset.
Secondly, the My-Link allows remote control
of some Myryad products which do not have
their own infra-red receiver.
4BI-AMP output
Many loudspeakers today are made so that
the bass and treble sections can be separated
and fed from two sets of speaker cables.
This is known as “bi-wiring” and can yield
a significant improvement in sound quality.
A further sound quality gain may be made
by “bi-amplifying” the loudspeaker – using
two separate power amplifiers to drive the
bass and treble sections.
The MI 120 makes provision for this
with its “BI-AMP” output, which can be
used to feed a separate MA 120 Power
Amplifier. The MI 120 loudspeaker outputs
should be connected to the bass sections
of the loudspeakers (left and right) while
the MA 120 drives the treble. This mode of
operation is described in more detail in
the MA 120 Owner’s Manual, or visit
www.myryad.co.uk/technology.html
5Loudspeaker outputs
The loudspeaker outputs are capable of
driving all loudspeakers with rated
impedances in the range 4Ω to 16 Ω. The
loudspeaker terminals are high – current
binding – posts, coded red or black. The
terminals on the left side of the amplifier
(viewed from the front) and marked “L”
should be wired to the left hand loudspeaker.
Those on the right, marked “R”, should be
wired to the right hand loudspeaker.
For correct stereo imaging it is important that
the two loudspeakers are wired “in phase”.
To ensure correct phasing wire the black (–)
terminal on the amplifier to the black or “–”
terminal on the loudspeaker. The red (+)
terminal on the amplifier should be wired to
the red or “+” terminal on the loudspeaker.
The loudspeakers should be positioned
as recommended by the loudspeaker
manufacturer. The two loudspeakers should
always be placed at equal distances from
the main listening position and usually
spaced a similar distance apart. It is generally
best to keep the loudspeakers away from
room corners and many loudspeakers work
best away from all walls.
6Tape 1input/output
These connectors are suited to any type of
tape recorder, including high-quality “3-head”
types which allow you to monitor the signal
off the tape whilst it is being recorded.
Connect a stereo cable from the TAPE 1 REC
output sockets of the amplifier to the LINE IN
or RECORD IN sockets on your tape deck.
Connect a second stereo cable from the TAPE
1 PLAY input sockets of the amplifier to the
LINE OUT or PLAY OUT sockets on your
tape deck.
Any source selected for listening on the MI
120 will automatically be fed to the TAPE 1
REC output sockets for recording. If the
2
contents
• Introduction 2
• Installation and safety notes 2
• Accessories 2
• Setting up your system 3
• Rear panel connections 3
• Operating your system 5
• Front panel controls 5
• Loudspeaker output protection 6
and muting
• Remote control handset operation 6
• Installing and replacing batteries 6
• Trouble-shooting guide 7
• Specifications 7
introduction
The Myryad MI 120 Stereo Integrated
Amplifier has been designed to offer
a combination of high quality sound
reproduction and elegant styling.
The amplifier can accept up to six line-level
input sources, including two tape recorders.
Outputs are provided for one pair of
loudspeakers and for headphones. All
functions – input selection, volume and
standby – can be operated using the infra-
red remote control handset.
The MI 120 offers a range of expansion
possibilities:
• The AUX. input can be converted to accept
the output from a phono cartridge by
installing a Myryad Phono Cartridge
Pre-Amp Module.
• A low-level “Bi-amp” output is provided
to feed the Myryad MA 120 Power
Amplifier, allowing bi-amplified drive
of suitable loudspeakers.
• The “My-Link” input/output can be
coupled to other Myryad products which
can then be remote-controlled via the
MI 120’s infra-red receiver.
installation and
safety notes
This amplifier generates a modest amount of
heat and thus requires ventilation. Do not
place it on a rug or other soft surface into
which it could sink, obstructing the air inlets
in its underside. Do not allow papers or cloth
to obstruct the ventilation grille in the top
cover. The amplifier should not be placed in
a built-in installation such as a bookcase or
rack unless proper ventilation is provided.
CAUTION:TO PREVENT A FIRE OR SHOCK
HAZARD, DO NOT PERMIT THIS PRODUCT TO
BECOME WET. IF LIQUID IS ACCIDENTALLY
SPILLED ON IT, IMMEDIATELY SHUT OFF ITS
POWER AT THE WALL SOCKET AND UNPLUG
THE AC POWER CORD. ALLOW SUFFICIENT
TIME FOR COMPLETE EVAPORATION TO OCCUR
BEFORE OPERATING THE AMPLIFIER AGAIN.
IF THE LIQUID IS ANYTHING BUT WATER
AND/OR ALCOHOL,THE AMPLIFIER SHOULD
BE EXAMINED BY A QUALIFIED SERVICE
TECHNICIAN BEFORE IT IS USED AGAIN.
Do not remove the cover, or attempt to
modify or repair the amplifier yourself.
Refer all servicing to a qualified technician.
accessories
Your MI 120 is supplied complete with the
following accessories:
• Separate mains power cord to suit
country of sale.
• Remote control handset.
• Four AAA batteries for handset
(not in some countries).
play
rec
aux
tuner
cd
video
gnd
tape 2
tape 1
play
rec
rl r l
power
onoff
bi-amp out
9
10
11
12
rl
out in
my-link
setting up your
system
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5
front panel
controls
1Standby
When the amplifier is plugged into a live wall
socket and the POWER switch is turned ON,
it will power up in “standby” mode and the
LED (Light Emitting Diode) in the STANDBY
button will illuminate. In this mode the
internal circuitry of the MI 120 is powered
up, but disabled so that it consumes very
little power and is isolated by relays at its
inputs and outputs.
When the STANDBY button is pressed the
amplifier circuitry will be activated, the input
used last automatically selected and, after a
few seconds delay, the loudspeaker outputs
will be connected to the amplifier. The LED
in the STANDBY button will change to blue
and the LEDs in the button of the selected
input and the volume control will both light
up. When first switched out of STANDBY
after POWER ON, the CD input will be
selected by default.
When the STANDBY button is pressed again
the amplifier will be returned to standby
mode. The LED in the STANDBY button will
illuminate again and all other LEDs on the
amplifier will be extinguished.
CAUTION:WHEN IN STANDBY MODE THE
INTERNAL CIRCUITRY OF THE MI 120 IS STILL
LIVE, SO ALL SAFETY PRECAUTIONS MUST
BE FOLLOWED.
2Infra-red receiver window
The infra-red (IR) remote control receiver is
mounted behind this circular window. It must
therefore not be obscured when the amplifier
is to be operated using the remote control
handset. Where possible it is best to arrange
that the IR window is in “line-of-sight” of the
remote handset.
3Volume control
The volume control adjusts the sound level
for both loudspeakers and headphones. It
does not affect the signals fed to the TAPE 1
and TAPE 2 REC sockets so it can safely be
adjusted whilst making a recording.
The blue LED pointer in the volume control
illuminates when the amplifier is operating.
The pointer may also be used to facilitate
manual operation of the control. When the
MUTE mode is engaged using the remote
control, the volume control pointer will flash
repeatedly to indicate this condition. Always
press MUTE on the remote handset again to
disengage the function before advancing the
volume control setting.
4Headphones socket
The headphones socket will accept a stan-
dard (6 mm) stereo jack plug or adapter.
All types of headphones of any impedance
may be used, with one exception: electro-
static headphones are usually supplied with
an adapter unit which must be connected
directly to the loudspeaker terminals.
Insertion of a plug into the headphones
socket automatically disconnects the loud-
speakers, silencing them. In order to resume
listening to loudspeakers you must unplug
the headphones from this socket.
The headphones output is not muted when
switching in and out of STANDBY mode,
so it is recommended that headphones
are unplugged from the amplifier before
switching to standby mode and plugged
in again after switch-on.
5Tape 1(Monitor)
When you press the TAPE 1 button you can
hear the output signal from a tape deck
connected to the TAPE 1 PLAY sockets on the
rear panel. This is a “toggle” function switch:
you press it once to engage and press again
to disengage. The blue LED in the centre of
the TAPE 1 button illuminates to indicate
that TAPE 1 is engaged. Pressing the TAPE 1
button has no effect on the other input select
buttons. The signal source selected by the
other input select buttons will be fed to the
TAPE 1 REC output sockets, irrespective of
whether the TAPE 1 button is engaged or not.
Thus, if you have a “three-head” tape deck
that permits off-tape monitoring you can
use the TAPE 1 button to switch back and
forth between the source signal and the off-
tape signal, to check its quality, whilst the
recording is in progress.
NOTE: IF THE TAPE 1BUTTON IS ENGAGED
WITH NO SIGNAL SOURCE CONNECTED TO
THE TAPE 1PLAY SOCKETS, OR WITH NO
TAPE RUNNING, THEN YOU WILL HEAR ONLY
SILENCE, REGARDLESS OF THE SETTINGS OF
ANY OF THE OTHER CONTROLS.
6Tape 2input select
When you press the TAPE 2 button you can
hear the output signal from a tape deck
connected to the TAPE 2 PLAY sockets on the
rear panel. The same signal will also be fed to
the TAPE 1 REC output sockets, so allowing a
standby phones tape 1cd video tuner aux
tape 2
4
operating your
system
TAPE 2 input is selected then tape copies
may be made from TAPE 2 to TAPE 1. It is
NOT possible to copy from TAPE 1 to TAPE 2.
7Tape 2input/output
These connectors are suited to any type of
tape recorder, but “off-tape” monitoring is
not possible using TAPE 2. The wiring from
TAPE 2 to your tape deck is identical to the
TAPE 1 wiring described above.
Any source selected for listening, except TAPE
1, will automatically be fed to the TAPE 2
REC output sockets for recording. It is NOT
possible to record from TAPE 1 to TAPE 2.
8CD input
Connect the audio output cables from a
CD player to these sockets. (Note: this input
is for an audio signal, not for the digital
output from your player.)
If you do not have a CD player then any
other line level source may be connected
to this input.
9Video input
Connect the audio signal output cables
from a video-related source such as video
cassette recorder or TV set to these sockets.
Alternatively any other line level source
may be connected to this input.
10 Tuner input
Connect the audio output cables from a radio
tuner to these sockets. If you do not have a
tuner then any other line level source may be
connected to this input.
11 AUX input
The audio output from any line level source
may be connected to this input. Alternatively
a Myryad Module may be fitted internally in
your MI 120 to convert this input for other
applications – such as phono cartridge input
for a record player. Your Myryad dealer can
advise you on what Modules are currently
available. Please follow the instructions
supplied with the Module when making
all connections.
12 Ground terminal
This terminal (marked GND) is provided for
grounding a record player connected to the
AUX. input when a Myryad Phono Cartridge
Pre-Amp Module is fitted (see page 3).
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6
trouble-shooting
guide
some of the most common problems
No sound:
•Power turned off or system in standby
mode. Check that the green pointer LED in
the volume control knob is illuminated.
• An inoperative input has been selected
(e.g. CD input with no CD playing or
TUNER input with the tuner switched off).
• An input has been selected with no
source connected.
• TAPE 1 or TAPE 2 has been selected with
no tape playing.
• Protection relay has operated because of a
short circuit loudspeaker wire or amplifier
overheating. Carefully check all wiring after
switching the amplifier POWER OFF to
allow it to cool.
• The fuse in the power cord inlet has failed.
Unplug the power cord from both the wall
socket and the amplifier and pull out the
small receptacle below the power cord
inlet. Two fuses should be visible. The
further fuse is the operative one and
should be checked. If it has failed, replace
it with the nearer (spare) fuse. If this too
fails, then return the amplifier to your
dealer for service.
• UK version only: The fuse in the
mains plug has failed. Check and
replace if necessary.
Sound in one channel only:
• Loudspeaker cable pulled loose. Check
all connections, both at the loudspeakers
and amplifier.
• Interconnect cable pulled loose or making
poor contact. Check and, if necessary,
un-plug and re-plug all relevant cables.
Loud buzz or hum:
• Interconnect cable pulled partially out
of its socket.
• Defective interconnect cable.
Hum in tape playback:
• Tape deck too close to the amplifier
(e.g. directly above or below).
• Plugs making poor contact with sockets.
Incorrect operation – some functions
not working:
• Control processor latched. Switch of
POWER switch on rear panel and wait for
at least one minute. Then switch POWER
switch on and press STANDBY button.
Normal operation should resume.
For further help please visit
www.myryad.co.uk/faqs.html
specifications
Continuous rated power output .….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….…8Ω:60W
(Min. power per channel, 20Hz – 20kHz, both channels, <0.05% THD)
Rated distortion (THD 20Hz – 20kHz).….….….….….….….….….….….….….….….….….….….….….….….….….….….….….…<0.05%
IHF dynamic power .….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….…8Ω:80
.….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….…4Ω:120W
.….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….…2Ω:160W
Slew rate .….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….…>60V/µsec
Damping factor (ref.8Ω, 50Hz) .….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….…>100
THD, SMPTE I.M. and IHF I.M..….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….…<0.05%
Line Level Inputs (Tape 1, Tape 2, CD, Video,Tuner, AUX)
Input impedance (R and C).….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….…10kΩ/420pF
Input sensitivity (ref. 60 watts).….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….…250mV
Maximum input signal.….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….…>10V
Signal/Noise ratio A-weighted (ref. 60W).….….….….….….….….….….….….….….….….….….….….….….….….….….….….…>104dB
Signal/Noise ratio A-weighted (ref. 1W) .….….….….….….….….….….….….….….….….….….….….….….….….….….….….….…>86dB
Frequency response (20Hz – 20kHz) .….….….….….….….….….….….….….….….….….….….….….….….….….….….….….…+0/-0.3dB
Line Level Outputs
Bi-amp output impedance.….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….…450Ω
Output level .….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….…775mV
Tape output impedance .….….….….….….….….….….….….….….….….….….….….….….….….….….….….…2kΩ + source impedance
Physical Specification
Dimensions (width x height x depth) .….….….….….….….….….….….….….….….….….….….….….….….….….…436 x 95 x 303mm
Weight, Net .….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….…8.75kg
Power requirements
Voltage (set by internal wiring).….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….….…120/230V
Stock No: OST 0011270
Revision A
tape to be copied from a playback tape deck
connected to TAPE 2 to a recording tape deck
connected to TAPE 1. The blue LED in the
centre of the TAPE 2 button illuminates to
indicate that TAPE 2 is engaged.
Pressing the TAPE 2 button disconnects all
signals from the TAPE 2 REC output sockets.
It is therefore not possible to make a recording
onto a tape deck connected to the TAPE 2
sockets when the TAPE 2 button is engaged.
7CD, Video, Tuner and AUX.
input selects
When you press one of these buttons you
can hear the output signal from the source
connected to respective input sockets on the
rear panel. The same signal will also be fed
to the TAPE 1 REC and TAPE 2 REC output
sockets for recording. The green LED in the
centre of the chosen button illuminates to
indicate which source has been selected.
Pressing any one of these buttons, or TAPE 2,
will disengage whichever input was previously
selected and extinguish its LED.
loudspeaker
output
protection and
muting
When the amplifier is in standby mode all
the input connectors and the loudspeaker
output terminals are isolated from the
amplifier by high quality relays. When the
amplifier is first switched on from standby
mode the loudspeaker outputs remain
disconnected for a few seconds to allow the
internal voltage levels to settle. The same
process occurs when the amplifier is switched
back into standby mode. This power-on mute
does not disconnect the headphone socket,
so it is recommended that headphones are
unplugged from the amplifier before
switching to standby mode and plugged
in again after switch-on.
The same loudspeaker mute relay is used
to protect both the amplifier and your
loudspeakers against possible damage.
If any one of a number of fault modes is
detected (loudspeaker outputs short circuit,
amplifier overheating, amplifier DC fault) the
loudspeakers will be disconnected from the
amplifier to protect both. In the case of a
short circuit or DC fault the loudspeakers will
be re-connected after a few seconds, but will
be disconnected again if the fault persists. If
overheating has caused the protection system
to operate, then it will take some time for
the heatsinks to cool sufficiently to allow the
loudspeakers to be re-connected (probably
between five and fifteen minutes depending
upon the room temperature and ventilation).
The amplifier will cool more quickly if it is
switched to standby mode, or if the POWER
is switched OFF.
remote control
handset operation
The nine keys at the top of the handset
operate the MI 120. The first six keys
(CD, TUNER, AUX, TV, TAPE 1 and TAPE 2)
function in exactly the same way as their
counterparts on the front panel, allowing
any input source to be selected for listening
or recording.
Pressing one of the VOLUME 5or 6
buttons will cause the motorised volume
control in the amplifier to rotate clockwise
or anti-clockwise respectively. There is one
aspect in which the remote operation of the
volume control is different from manual
operation. If the amplifier is in mute mode
(after pressing MUTE on the R/C handset)
then pressing the VOLUME 5button will
automatically disengage mute mode and
re-connect the loudspeakers. This prevents
an excessively high volume level from being
set by mistake.
Pressing the MUTE button on the handset
will engage mute mode. The loudspeakers
will be disconnected and the blue LED in the
volume control knob will flash slowly. MUTE
is a “toggle” function, so pressing the button
again will disengage the mute mode.
The green STANDBY button at the bottom
left of the handset can be used to toggle the
MI 120 into STANDBY mode (see page 5,
Front Panel Controls, section 1).
Operation of Myryad CD Players
and Tuners
The Myryad System Remote handset will also
control Myryad CD Players and Tuners. The
PLAY, PAUSE, STOP, SHUFFLE, TIME,
REPEAT, SKIP4and SKIP3keys are for CD
Player operation only. The PRESET, MANUAL,
SEARCH, MONO, STORE, TUNE 5and
TUNE 6are for Tuner operation only.
The remaining keys, the digits 0 to 9 and
DIM, can operate either a CD Player or a
Tuner. To control a CD Player, press the CD
input source select button. Then “0-9” and
DIM will control only the CD Player until the
TUNER input source select button is pressed.
To control a Tuner, press the TUNER input
source select button. Then “0-9” and DIM
will control only the Tuner until the CD
input source select button is pressed.
installing and
replacing
batteries
The remote handset uses four 1.5V type AAA
batteries. To fit new batteries first open
the battery compartment in the rear of the
handset and remove any existing batteries.
Fit the new ones as directed by the symbols
moulded inside the battery compartment,
then replace the battery compartment cover.
The batteries should always be removed if
they are flat (indicated by no remote control
operation or by operation only at very short
range), or if the remote control is not going
to be used for an extended period.
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