CYRUS III Stereo Integrated Amplifier Instruction Manual
- June 3, 2024
- CYRUS
Table of Contents
User Instructions Cyrus Ⅲ
Cyrus Ⅲ Amplifier
INTRODUCTION
Congratulations on the purchase of your Cyrus III Amplifier. This piece of equipment is a precision manufactured state-of-art product, constructed to the highest standards and specifications. This manual contains installation and operating instructions to enable the user to connect up and operate the amplifier correctly, thus ensuring the greatest satisfaction and long term use. This instruction manual is divided into eight sections.
- Cautions
- Installation
- Operation
- Remote Control
- Additional Information
- Trouble Shooting
- Specifications
- Guarantee
To enable you to make full use of the comprehensive facilities of the
amplifier we suggest that you read these sections which will explain the
fundamental operations of the unit.
CAUTION POLARISED CAUTION POLARISED CONNECTOR (115V PRODUCTS ONL To
prevent electrical shock, match wide blade of plug to wide slot and fully
insert
Your Cyrus HI Amplifier is factory set to operate from a fixed mains supply
voltage, which is marked on a label at the rear of the unit. Before
connecting, check that this voltage is the same as your mains supply, i.e.
230V Products Voltage Range 220V-240V
115V Products Voltage Range 110V-120V
UNPACKING
Always follow the instruction handbook and retain it in a safe place for
future reference. Before proceeding with installing the Cyrus III Amplifier,
ensure that the following items are included in the accessory box:
- Instruction Manual
- Power Cable
- Remote Handset
- 4 Loudspeaker Plugs
- Guarantee Card After removing these items, please retain the packing for future use.
LOCATION
Install the amplifier in a well ventilated location where it will not be exposed to high temperature or humidity.
Avoid installing the Cyrus HI Amplifier in a location which is exposed to
direct rays of the sun, or near to hot appliances or radiators. Placing and
using the amplifier for long periods on heat-generating sources will affect
performance and may damage the cabinet. Installation in a damp or dusty
environment may result in malfunction or accident.
RE-LOCATING
The Cyrus III Amplifier is supplied ready for use in your location. Care has
been taken to ensure that the power supply requirements are correctly set.
Consult your Mission distributor to arrange for conversion of your Cyrus III
should you move to another area with a different mains voltage supply.
PRECAUTIONS REGARDING INSTALLATION
It is important not to allow any liquid or foreign object fall into this unit.
When muting the power cord avoid running it over or near sharp objects. If the
amplifier is not to be used for a long period of time, unplug the unit from
the mains power supply. This unit contains no user serviceable parts,
therefore never remove any panels from the unit or attempt to service the
unit. In the unlikely event of failure, please refer to qualified service
personnel.
INSTALLATION
Fig.1 Amplifier (rear view)
- Right Speaker Output
- Left Speaker Output
- Pre-Amplifier Output
- Tape Recorder Output
- Tape Input
- Aux Input
- CD Input
- Phono Input
- Tuner Input
- Video Input
- MC-BUS System Connection
- PSX-R Connection
- Turntable Ground
- Power Inlet
- Mains Fuse
- Power Switch
POSITIONING THE UNIT
The Cyrus III may be positioned as a free standing unit or alongside another
piece of audio equipment. Never stand the Cyrus III under another unit. This
may adversely affect the efficient cooling of the Cyrus III. Never place the
Cyrus III on a carpet or similar material which may hamper normal ventilation.
CONNECTING THE UNIT
The Mains Supply The moulded IEC connector of the mains lead supplied should
be plugged in to the power inlet 0 on the rear of the unit. The mains fuse ®
is located on the rear panel next to the power switch. It must only be
replaced with the following types: U.K. / Europe – 230V T1A/20mm N. America /
Far East – 115V T2A/20mm
In the U.K., the Cyrus III comes with the mains plug fitted. In the unlikely
event that the plug fuse should need replacing ensure that it is only replaced
with a 3 Amp Fuse.
IMPORTANT
NOTE TO USERS OF PSX-R WITH CYRUS III
In order to use a PSX-R regulated power supply with the Cyrus III Amplifier,
certain internal adjustments must be made to the Cyrus III which can only be
carried out by an authorised Mission distributor or his agent. Connection of
the PSX-R to a Cyrus III which is not correctly adjusted will result in fault
condition display on the Cyrus III. The Cyrus III fault indication system is
fully described in the Cyrus III handbook.
Connecting a PSX-R Power Supply (Optional)
If a PSX-R is to be used with the Cyrus III, proceed to connect the umbilical
cord of the PSX-R to the 5-pin Cannon input socket of the Cyrus III. When
correctly fitted, the connector will latch into place in the socket. Note that
when a PSX-R is in use, both the PSX-R power supply and the Cyrus III will
require mains power.
Note: For more details on the PSX-R, please refer to the Cyrus PSX-R
Instruction Manual.
Connecting a Turntable
Connect the phono cable from the turntable to the phono input – PH ®. Be sure
to follow colour coding of the plugs to keep left and right channels correctly
ordered. If the turntable has a ground wire fitted, connect this to the
Turntable ground connection 0 of the amplifier. Note that the phono pre-
amplifier of the Cyrus III is suitable for use with a pick-up cartridge of
either moving magnet or high output moving coil design. A low output moving
coil cartridge will require a step-up transformer or pre-amplifier to be used
externally. Your dealer can advise if this is necessary.
Connecting other Inputs
Connect a phono cable between each system component and the rear panel sockets
as marked on the rear panel diagram. At all times observe the colour coding of
the phono cable for left and right channel identification. The Cyrus III
provides for connection of a CD Player -CD 0, a tuner – TU ®, a video recorder
or video disc player – VI 0 and an auxiliary input – AU ®. The AU input can be
used for connection of a wide variety of products such as a second CD player,
tuner or VCR, an electronic keyboard, an organ or a second tape deck if only
replay is necessary. Always check the technical
specification of these products before connecting to your Cyrus III. Consult
your dealer if in doubt.
Connecting a Tape Recorder
Two phono cables are necessary for connection of a tape recorder when used.
Firstly, connect a phono cable from the Output or Playback sockets of the tape
recorder to the Tape Input – TP IN 0 of the Cyrus III. Then connect a second
phono cable from the Input or Record sockets of the tape recorder to the Tape
Record Output – TP OUT 0 sockets of the Cyrus III.
Connecting Loudspeakers
The left and right loudspeakers are connected to the rear panel sockets Q and
0 of the Cyrus III respectively using the plugs provided. First, fit the plugs
to the loudspeaker cables. Carefully note that the cable carries marking or
colours for polarity, (+ and -) may also be marked for direction with an
arrow. For correct operation, it is essential that the (+ and – ) terminals of
the amplifier are connected to the corresponding (+ and -) terminals of the
loudspeakers. When fitting the plugs to the cables be sure to line up (+ and
-) at each end. The loudspeaker plugs can now be fitted to the amplifier
sockets.
OPERATION
Fig.2 Amplifier (rear view)
- Standby Switch
- Standby Light
- Balance
- Remote Eye
- Volume Level
- Tape
- Auxiliary
- Video
- Tuner
- CD
- Phono
- Mute
POWER
The mains power switch 0 is located on the rear panel of the amplifier
(refer to the rear panel drawing on partgfrtrgfrgfrtgfrgtrerrfh mode of
operation.
Remote Control Handset as supplied with Cyrus III only
Volume Control In normal mode the rotary knob of the Cyrus III controls the
volume in 1 dB steps from its maximum level down to the minimum. The light
ring around the knob is calibrated to give the correct loudness scale to the
changes in the volume level. When the volume is set to the minimum level the
first L.E.D. indicator on the light ring will be RED. The currently set volume
is preserved when the unit is put into standby mode. Should the level be set
abnormally high when standby is selected, this will be automatically adjusted
down to a safer level on switch-on. Balance Control Your Cyrus III is equipped
with a Balance control key 0 which is used to change the operation mode of the
rotary knob to that of Left – Right Balance. When selected, the light ring
will change function to work in “reverse -video” format with the unlit section
indicating the position of L-R balance.
When in this mode, you can control the L-R balance by up to +/-4dB as well as
switching one channel off completely when the control is turned to an extreme.
The balance mode is automatically reset after 5 seconds of inactivity of the
rotary knob. It can also be reset by pressing the balance key again. Mute
Pressing the Mute Key 0 will fade out the volume to minimum level without
disturbing the existing setting. When muted the minimum level indicator light,
RED will light as well as the existing GREEN light to show that the output is
muted. Changing the volume knob or pressing the Mute key will reset the mute,
fading in the original volume setting.
REMOTE CONTROL
Controls for Cyrus HI Amplifier
Controls for Cyrus FM7 Tuner
Power Off Control for Cyrus /H and Cyrus FM7
- Power Off
- Numeric Keypad
- Mono
- Mute
- Tape Monitor
- Balance
- CD Select
- Tuner Select
- Video Select
- Aux Select
- Volume Control
- Seek Down
- Seek Up
- Store
- Display
REMOTE OPERATION
Power
Your Cyrus III may be turned on by selecting any Input Select Key ®- io on the
Cyrus amp – tuner handset. If an FM7 is used, then pressing the Tuner Select
Key – TUN ® will also switch the tuner on. To switch the power off from the
remote position, press the “Cyrus System Off” RED Key on the handset.
Cyrus III Controls
The remote control handset of the Cyrus III serves a dual purpose of
controlling your amplifier as well as the Cyrus FM7 Tuner should you own one.
The top three rows of keys on the handset replicate the front panel of the
Cyrus III making it possible to have full control of the amplifier from a
remote position.
FM7 Controls
Your FM7’s functionality is greatly enhanced when using it with your Cyrus amp
– tuner handset. The following paragraphs describe the FM7 remote control
functions in detail. Read the subsequent paragraphs if you own a Cyrus FM7.
Auto Tuning In addition to the normal SEEK UP tuning facility available on the
FM7 front panel, the remote control handset provides the possibility of
scanning down the broadcast band providing additional flexibility.
Preset Storage
Building onto the seven presets available on the front panel, the remote
control handset gives access to 29 preset locations in total. To store a
preset, select a station using AUTO or MANUAL tuning and press the STORE key a
The preset digits on the display will flash prompting you to enter a two-digit
preset location number. For location numbers under 9 the digit must be
preceded by a zero.
Preset Selection
The numeric keypad of the handset enables direct entry of the preset location
number. To select a preset enter a two-digit number up to 29. Exceptions to
this are location numbers 3 to 9 which can be accessed by a single digit
entry.
Mono Operation
The tuner may be forced into mono operation using the MONO key QQ on the
handset. This is useful in cutting the background noise substantially when
tuned to weak transmissions. This function may also be beneficial in improving
quality of centre-image broadcasts such as news, sports, etc. Should you wish
to permanently receive a particular in MONO proceed as follows. Tune to the
desired station and press the MONO key a The mono symbol ‘ ! ‘ will be
displayed on the front panel in place of the stereo symbol 0. Press the STORE
key 0 and dial in the preset location number as required.
Display Control
The DISPLAY key 15 on the handset can be used to switch the display of the FM7
off should this be preferred. Pressing this key again restores the display to
its normal mode. Switching the display off reduces the power consumption of
the unit and eliminates the digital traffic related to the display update
function. This can improve the overall quality of reception without adversely
affecting the normal functions of your FM7.
KNOW YOUR CYRUS III
Power
-
When first powered up from the mains switch on the rear panel, the Cyrus III will run a self-test, checking the internal functions and all the front panel indicators in sequence. After completion of this cycle the amplifier will revert to Standby mode. When first switched on from standby the CD input is automatically selected and the volume is set to minimum.
-
When set to Standby the front panel settings for input selection and Volume/Balance will be retained until next used. If the unit is put in standby mode while set to abnormally high volume levels, the Cyrus III will power on at the safe level of -15dB when next switched on.
-
When switched to Standby, the power amplifier section of the Cyrus III is shut down to ensure minimal power consumption and reduced heat generation.
-
If other Cyrus products are used with the Cyrus III, they can be connected via the MC-BUS as shown on page 15. This will ensure that the power ON/OFF will function in unison between all Cyrus products, locally as well as via the remote control handset. For
example, if the tuner input – TUN of the Cyrus III is selected, them the FM7 tuner will automatically turn on. Conversely if the Standby key on the Cyrus III is pressed, then all Cyrus products connected via the MC-BUS will turn off. -
The Cyrus III runs at a high quiescent current setting to ensure deep operation into class AB. This naturally results in the enclosure to be warm to the touch and therefore should not be a cause for concern.
Volume and Balance -
The volume control system of your Cyrus III is a precision 1 dB – step attenuator design which is musically transparent. One major advantage of this design is its absolute accuracy, which unlike conventional volume pots maintains +/-0.1 dB tolerance throughout 63 steps of attenuation available.
-
The volume setting of your Cyrus III is achieved independently for the Left and Right channels. The L-R channel balance can therefore be controlled by applying an offset to the attenuation of one channel with respect to the other with the same degree of precision. The channel balance is maintained within +/- 0.2dB across the full volume control range.
Signal Processors
ADDITIONAL INFORMATION
-
A multitude of signal/sound processing components such as Dolby Pro-Logic sound processors may be used with the Cyrus III by connection inside the “Tape Loop” of the amplifier. In this case the tape recorder is normally connected to the processor instead. For detailed connectivity refer to the relevant component’s manual.
Bi-amping / Tri-amping -
The buffered pm-amplifier output of the Cyrus III may be used in conjunction with added power amplifier blocks to upgrade your loudspeaker system through Bi-amping or Tri-amping. In this case you should check that the sensitivity of the power amplifier modules are compatible with the output level of the Cyrus III.
External Regulated Power Supply – PSX-R -
Addition of a PSX-R which is a highly regulated DC power supply will upgrade the sonic performance of your Cyrus III as well as enhancing its current drive ability into difficult loudspeaker loads. Should you decide to add this optional extra to your system, be sure to have your Cyrus III converted by your dealer or an authorised Cyrus Service Organisation.
-
When Cyrus III / PSX-R combination is installed all analogue and signal related sections of the Cyrus III are powered from this clean and highly stable power source, while the remaining power requirements are supplied internally. This technique ensures complete isolation of the sensitive analogue sections from the control side as well as the AC mains-borne noise and power supply ripple which of course, enhances the delicacy and transparency of the reproduced music programme.
MC-BUS System Connection -
This is an optional connection via the MC-Bus sockets 0 (see rear panel drawing on page 4), which can provide unified power control of a complete Cyrus system from your Cyrus III. The MC-Bus connections should be wired as a ‘loop’ using single RCA phono interconnects. The diagram on the next page shows a typical Cyrus system of Cyrus DAD7, Cyrus FM7, Cyrus III and Cyrus Power with such an MC-Bus loop connected. Referring to this diagram, connect the first cable between the MC-Bus output of the Cyrus HI and the MC-Bus input of the next Cyrus component. Continue to wire each product MC-Bus output to the next input, finally returning to the Cyrus III input to complete the loop. Operating a system with MC-Bus connected
- When the above connections have been made it will now be possible to control the power function of the entire system from the Cyrus III, either from the front panel or by remote control. Selecting ‘CD’ from the Cyrus III front panel will then switch on the Cyrus III, the Cyrus Power and the Cyrus DAD7 CD player. When the Cyrus HI is set to Standby, all system components will also switch off.
- Another important function of the MC-Bus system is to enable Micro-processor controlled testing and calibration to be applied during the production phase of the Cyrus range of products. Using the MC-Bus all possible tests relating to the correct operation of the system are performed in a relatively short period of time. Such rigorous tests are only possible with the aid of this proprietary communication bus system 1
which ensures consistency and quality levels hitherto impossible to achieve in an audio product of this price range.
AMPLIFIER MAINTENANCE
There are no user serviceable parts in the Cyrus III so there is no reason to remove any of the panels. After disconnecting the mains power supply, the cabinet may be cleaned using a chamois leather, slightly moistened with water. DO NOT use cleaning agents containing alcohol, spirits, ammonia or abrasives.
THE MISSION/CYRUS GROUP MANUFACTURE
- Loudspeakers
- Loudspeaker Stands
- Loudspeaker Cables
- Compact Disc Players
- D-to-A Converters
- Amplifiers
- Tuners
- Home Theatre Processors
- Regulated Audio Power Supplies
- Isoplat (Vibration Isolation Platform)
TROUBLESHOOTING
TROUBLESHOOTING GUIDE
If you suspect that your Cyrus III is not operating to specification please
read through this section before returning the amplifier to your local dealer.
No Sound from either Speaker
-
Check that the amplifier is on. Green power light should be “ON”.
-
Check that the amplifier responds to different front panel commands.
-
Check that the MUTE light on the volume control light ring is “OFF”.
-
Check that the relevant programme source is selected and is working. For example the CD Player is playing.
-
Check that the Tape Monitor is not selected inadvertently, RED light above the TP key is “OFF”.
-
Check that the loudspeakers are not inadvertently disconnected.
-
Check that the installation is correct according to the installation guide in this booklet.
-
Check that there is not fault indication on your Cyrus HI front panel. If so refer to the next section.
No Sound from one Speaker -
Check the Balance Control is not set to left or right limits.
-
If your loudspeakers are fitted with protection fuses, check that the fuse is intact.
-
Check the interconnect cable integrity on the rear panel and at source. If possible use another interconnect cable.
-
Check the speaker cable connection integrity of the missing channel.
If the problem persists proceed as follows: -
Change the programme source using the suspected interconnect cable and check that the problem still exists. If the fault is removed by doing this then the original source is at fault.
-
Interchange the left and right connection of the interconnect cable at SOURCE. If the missing channel switches over then there is a problem in one channel of the source or the interconnect. If the sound disappears totally then there may be two problems present in your system.
-
Change over the left and right channels of your loudspeaker on the Cyrus III rear panel. If the problem stays in the same channel, then there is a fault in the loudspeaker cable or the loudspeaker. Now switch the cable at the loudspeaker end and if the problem switches then the loudspeaker is faulty, otherwise it is the loudspeaker cable which may be defective.
Note: Be sure to restore the system to its original configuration after completion of the above series of tests. Spurious Sounds from the Loudspeakers If you experience strange or unnatural noises from your system proceed as follows: -
Select another source to ensure that this is not a common problem. If the problem remains switch the Cyrus III off at the rear panel and turn it on again after a few seconds.
-
If the problem is limited to a single source, check the integrity of the interconnection to the source and in the case of a phono turntable, check that the phono ground wire is secured at the rear panel of the Cyrus III
FAULT INDICATION SYSTEM
The Cyrus III has a unique fault indication system, built in to help you to
diagnose the possible cause of a problem. All fault indications are presented
by the Standby light on the front panel of your Cyrus III.
FAULT INDICATION AT FIRST INSTALLATION
Flashing RED
-
This indicates that the Cyrus III has been adjusted for use with a PSX-R power supply, but a PSX-R has not been connected correctly. In this case, check that the PSX-R umbilical cord is connected to the rear panel PSX-R socket and that the mains power is connected securely to both products. If the connections are in order and the indication persists, return the unit(s) to your Mission distributor.
Flashing GREEN -
This indicates that a PSX-R power supply has been connected to a Cyrus HI without the correct preparation for PSX-R use. In this case, remove the PSX-R cable and re-test the Cyrus III. If the Cyrus III functions correctly, return the amplifier to a Mission distributor for PSX-R adjustment.
FAULT INDICATION WHEN IN USE
Flashing GREEN / YELLOW -
This indicates an overload condition in at least one channel. If the problem is of a temporary nature (for example excessive volume setting), normal operation will resume after four seconds. If the fault indication persists, there may be a problem with the loudspeakers or their connections. In this case, switch off the power at the rear of the Cyrus III and disconnect the speaker cables from the rear panel. If the fault indication has now cleared, check the loudspeakers, cables and plugs carefully for loose strands of wire which may cause a short circuit.
Flashing RED -
This indicates an internal problem with the Cyrus III or PSX-R (where used). If the problem does not clear when the amplifier power is reset, return the unit(s) to your Mission distributor for checking.
Flashing GREEN -
This indicates a fault reported from the PSX-R. In this case, switch off the power to both the Cyrus III and the PSX-R and switch on again. If the problem does not clear, return both units to your Mission distributor for checking.
AUDIO PERFORMANCE
Input Sensitivity Line 200mV (50W/812) Phono 2.75mV
Input Impedance Line 22k0 Phono 47k0 +50pF
Volume Control Accuracy +/-0.1dB OdB to – 63dB
Channel Balance +/-0.2dB 0dB to -63dB
Frequency Response (-3dB). Line 2Hz, 80kHz RIAA accuracy Phono +/-0.2dB Signal
to Noise Ratio Line 98dBA (A-WTD) Phono 80dBA Power Output 8 Ohms 50W (both
channels driven) 4 Ohms 70W THD+N (PRE – AMP) Line 0.004% !kHz Phono 0.03%
THD+N (AMP) (both channels driven) 8 Ohms 0.02% (1kHz half power) 4 Ohm 0.03%
POWER SUPPLY
Voltage See the plate attached to the rear of unit
Power Consumption Standby (12W) ON (No Load) (23W) ON (2 x 50W/Ch) (185W)
Safety Requirements IEC 65
ENCLOSURE
Dimensions (WxHxD) 215 x 75 x 365 mm Weight 4.6Kg Material Magnesium alloy and
Aluminium alloy
The company reserves the right to change this specification without prior
notice.
Part No. AM-MANUUIss.02-95 I I File:7AEN5B I I.WIM
GUARANTEE
This guarantee only becomes effective if the guarantee card enclosed is
completed by the Dealer and the purchaser and returned to MISSION or
Distributor within 8 days of purchase. This guarantee excludes:
i) All damage caused through accident, misuse, wear and tear, neglect or
through incorrect installation, adjustment or repair by unauthorised
personnel.
ii) Liability for damage or loss occurring in transit to or from the
purchaser. Claims under this guarantee must, whenever possible, be made
through the Dealer from whom the equipment was purchased or if that is not
convenient, through another authorised MISSION/CYRUS dealer.
MISSION shall not be liable for any consequential damage, loss or injury
whatsoever, arising from or in conjunction with this equipment.
The cost of carriage (to or from the Dealer) shall be borne by the purchaser.
This guarantee is personal to the original Purchaser and is not transferable.
If equipment is found on examination to comply with the published
specification, MISSION reserves the right to make a charge for examination and
for return carriage.
No Dealer or Distributor has any authority to vary the tenns of this
guarantee. Any unauthorised servicing will result in loss of guarantee.
We strongly recommend that you retain the sales receipt for your CYRUS
equipment in case of any warranty claim. The above conditions do not affect
your statutory rights as a consumer.
NOTES
Documents / Resources
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CYRUS III Stereo Integrated
Amplifier
[pdf] Instruction Manual
III Stereo Integrated Amplifier, III Amplifier, Stereo Integrated Amplifier,
Integrated Amplifier, Stereo Amplifier, Amplifier
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