Yamaha XM4220, XM6150 User Manual
POWER AMPLIFIER
XM6150
XM4220
Owner’s Manual
E
Introduction
Thank you for purchasing a Yamaha 6150, or 4220 XM Series Power Amplifier.
The XM Series of power amplifiers was developed from Yamaha’s wealth of experience in
building PA equipment and its tradition of careful attention to every detail of circuit design. These
power amplifiers feature high power and superb quality together with superior reliability and
stability, guaranteeing the highest possible audio performance.
Main features include
• Six amplifiers (four on the 4220) that can be used independently or in stereo pairs. Channel
pairs can also be bridged.
• Balanced XLR and Euroblock connector inputs, 5-way binding post outputs.
• Each channel features a switchable HPF, which filters frequencies below 80 Hz, a detented
attenuator, and SIGNAL and CLIP indicators.
• The input signal connected to channel A can easily be fed to the other channels using the
CH A TO ALL CH switch.
• Protection includes power on/off muting, DC detection, temperature, and protection
indicator.
• Variable-speed, low-noise cooling fan system ensures high reliability even under the most
demanding conditions.
This Owner’s Manual applies to the XM6150 6CH and XM4220 4CH power amplifier. In order
to take full advantage of your power amplifier and enjoy long and trouble-free operation, please
read this Owner’s Manual carefully before using your XM Series Power Amplifier.
WARNING: THIS APPARATUS MUST BE EARTHED
IMPORTANT
THE WIRES IN THIS MAINS LEAD ARE COLOURED IN
ACCORDANCE WITH THE FOLLOWING CODE:
GREEN-AND-YELLOW : EARTH
BLUE : NEUTRAL
BROWN : LIVE
As the colours of the wires in the mains lead of this apparatus may
not correspond with the coloured markings identifying the terminals in
your plug, proceed as follows:
The wire which is coloured GREEN and YELLOW must be
connected to the terminal in the plug which is marked by the letter E
or by the safety earth symbol or coloured GREEN and YELLOW.
The wire which is coloured BLUE must be connected to the terminal
which is marked with the letter N or coloured BLACK.
The wire which is coloured BROWN must be connected to the
terminal which is marked with the letter L or coloured RED.
* This applies only to products distributed by YAMAHA KEMBLE
MUSIC (U.K.) LTD.
2
Precautions
Warnings
• Do not allow water to enter this unit or allow the unit to
become wet. Fire or electrical shock may result.
• Connect this unit’s power cord only to an AC outlet of the
type stated in this Owner’s Manual or as marked on the unit.
Failure to do so is a fire and electrical shock hazard.
• Do not scratch, bend, twist, pull, or heat the power cord. A
damaged power cord is a fire and electrical shock hazard.
• Do not place heavy objects, including this unit, on top of the
power cord. A damaged power cord is a fire and electrical
shock hazard. In particular, be careful not to place heavy
objects on a power cord covered by a carpet.
• If you notice any abnormality, such as smoke, odor, or
noise, or if a foreign object or liquid gets inside the unit,
turn it off immediately. Remove the power cord from the
AC outlet. Consult your dealer for repair. Using the unit in
this condition is a fire and electrical shock hazard.
• Should this unit/AC adapter/power supply be dropped or the
cabinet be damaged, turn the power switch off, remove the
power plug from the AC outlet, and contact your dealer. If
you continue using the unit without heeding this instruction,
fire or electrical shock may result.
• If the power cord is damaged (i.e., cut or a bare wire is
exposed), ask your dealer for a replacement. Using the unit
with a damaged power cord is a fire and electrical shock
hazard.
• Do not remove the unit’s cover. You could receive an
electrical shock. If you think internal inspection, maintenance, or repair is necessary, contact your dealer.
• Do not modify the unit. Doing so is a fire and electrical
shock hazard.
Cautions
• When rack-mounting the unit, allow enough free space
around the unit for normal ventilation. This should be: 10
cm at the sides, 30 cm behind, and 20 cm above.
For normal ventilation during use, remove the rear of the
rack or open a ventilation hole.
If the airflow is not adequate, the unit will heat up inside and
may cause a fire.
• To mount several of these units in an EIA-compliant rack,
refer to the rack mounting instructions on page 8.
• This unit has ventilation holes at the (top, bottom, front,
rear, and sides) to prevent the internal temperature rising too
high. Do not block them. Blocked ventilation holes are a fire
hazard.
• Clean the contacts of the phone plug before connecting it to
the SPEAKERS jack of this unit. Dirty contacts may
generate heat.
• Use only speaker cables when connecting speakers to
amplifier outputs. Using other types of cables is a fire
hazard.
• Hold the power cord plug when disconnecting it from an AC
outlet. Never pull the cord. A damaged power cord is a
potential fire and electrical shock hazard.
• Do not touch the power plug with wet hands. Doing so is a
potential electrical shock hazard.
• Do not use this amplifier for any purpose other than driving
loudspeakers.
Usage
• Using a mobile telephone near this unit may induce noise. If
noise occurs, use the telephone away from the unit.
• XLR-type connectors are wired as follows: pin 1: ground,
pin 2: hot (+), and pin 3: cold (–).
Contents
Controls and Functions .............................................4
Front Panel .......................................................... 4
Rear Panel...........................................................5
Connection ................................................................ 7
Using a Euroblock connector...............................7
Speaker Connection ............................................7
Air Flow .....................................................................8
Rack Mounting ..........................................................8
Specifications ............................................................ 9
General Specifications......................................... 9
Block Diagram ...................................................10
Dimensions ........................................................ 11
Troubleshooting ...................................................... 12
3
Controls and Functions
■ Front Panel
1
2
1 POWER switch and indicator
This is the main POWER switch. Press to turn on the
amplifier. Press it again to turn off. The POWER
indicator lights up when the amplifier it turned on.
2 PROTECTION indicator
When the protection system is active, the PROTECTION indicator lights up and the speakers are automatically disconnected from the amplifier’s outputs.
The protection system activates in the following
situations:
• When the amplifier is turned on
The protection system activates for approximately
three seconds when the amplifier is turned on. After
three seconds, the protection system deactivates
automatically and the amplifier is ready for normal
operation.
• If a DC voltage is detected at the amplifier’s
outputs
The protection system activates if a DC voltage is
detected at the amplifier’s outputs. Once the DC
voltage problem is corrected, the protection system
deactivates automatically and the amplifier is ready
for normal operation.
• If the amplifier overheats
If the amplifier overheats, the protection system
activates. In this case, you should turn off the amplifier and allow it time to cool down. When it has
cooled down, the protection system deactivates
automatically and the amplifier can be turned on again
ready for normal operation. See the Precautions
section of this Owner’s Manual for ways to prevent
the amplifier overheating.
4
3
* The illustration shows model XM6150.
3 CLIP indicator
A channel’s CLIP indicator lights up when its output
distortion exceeds 1% (i.e., clipping). Output signal
clipping is typically caused by excessive input signal
levels.
4 SIGNAL indicator
A channel’s SIGNAL indicator lights up when its
output exceeds 2 V rms, which is equivalent to 1/2
watt into 8 ohms, or 1 watt into 4 ohms.
4
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