MCN Audio U4410 User manual

MCN AUDIO
U4410
HEADPHONES AMPLIFIER
USER’S MANUAL
OPTIONS
Option 96 Service Manual.
Option 80 FRB Mains Connector
Option 81 CEI Mains Connector
ACCESSORIES
W1101-80 Power cord 2.5m length / FRB connector
W1101-81 Power cord 2.5m length / CEI connector
SERIAL NUMBER

MCN AUDIO - U4410 - HEADPHONES AMPLIFIER 2
CONTENT
GENERALITIES 3
WARRANTY 4
SPECIFICATIONS 5
PRECAUTIONS 6
HEADPHONES - Safety Warning 6
SYNOPTIC 7
FRONT PANEL 8
REAR PANEL - Option 81 9
INPUT AND OUTPUT LEVELS 10
BANDWIDTH 10
INDEX 11
Due to permanent technical improvements, specifications listed here can change
without prior notification.

MCN AUDIO - U4410 - HEADPHONES AMPLIFIER 3
GENERALITIES
The U4410 is a stereophonic headphones amplifier designed for monitoring applications.
Its three independent outputs are fed by three stereophonic amplifiers, each with its own level
adjustment on the front panel. An internal switch adjusts the impedance (50 ohms or 600 ohms) to
match the headphone specification. A specific amplifier design provides a large power headroom and
a high signal to noise ratio. The U4410 can handle all the dynamics of today’s digital recordings
without distortion.
Two indicators (OVER LEFT/RIGHT) monitor the input signal. They light up when the input level
reaches 6dB below clipping, if a DC offset is present in the input signal or in case of output stage
overload.
Thanks to two combo style inputs (XLR balanced or 6.35 mm JACK unbalanced) located on the rear
panel, the amplifier U4410 is easily connected to any modulation source, such as mixing equipment,
dispatching, or even to another headphones output.

MCN AUDIO - U4410 - HEADPHONES AMPLIFIER 4
WARRANTY
This equipment is warranted against defects in material and workmanship for a period of five (5)
years from date of delivery.
The warranty will be voided if the unit is tampered with or serviced by unauthorized personnel.

MCN AUDIO - U4410 - HEADPHONES AMPLIFIER 5
SPECIFICATIONS
INPUTS
Balanced:
Two channels transformerless left and right inputs.
Nominal level +4 dBm, 1.2 Vrms
Maximum level +28 dBm, 19.4 Vrms.
Balanced impedance 10 kOhms.
Common mode impedance 5 kOhms.
Protection Against phantom power.
Connectors 3 point female XLR.
Unbalanced:
Two channel independant stereophonic inputs.
Nominal level +4 dBm, 1.2 Vrms.
Maximal level +14 dBm, 3.9 Vrms.
Impedance 2 kOhms.
Connectors 2 stereophonic 6.35mm JACK.
OUTPUTS
Unbalanced:
Maximum level for 0.5 % distorsion:
+ 19.2 dBm, 7.0 Vrms, 1000 mWatt on 50 Ohms.
+ 21.7 dBm, 9.5 Vrms, 600 mWatt on 150 Ohms.
+ 21.8 dBm, 9.6 Vrms, 310 mWatt on 300 Ohms.
+ 22.0 dBm, 9.8 Vrms, 160 mWatt on 600 Ohms.
Nominal level + 13.9 dBm, 3.8 Vrms, 300 mWatt on 50 Ohms.
+ 18.7 dBm, 6.7 Vrms, 300 mWatt on 150 Ohms.
+ 21.7 dBm, 9.4 Vrms, 300 mWatt on 300 Ohms.
+ 21.7 dBm, 9.4 Vrms, 150 mWatt on 600 Ohms.
Impedance less than 0.5 Ohm at 1 kHz.
Connectors 3 stereophonic 6.35 mm JACK.
TRANSFER
Bandwidth 20 Hz/20 kHz at +/- 0.3 dB
Rise/Fall time 2 µs
Phase shift < -1˚ from 20Hz to 1 kHz
< -8˚ at 10 kHz
< -13˚ at 20 kHz
Maximum gain 16 dB on balanced inputs
Distorsion at 1kHz 0.020 % on 50 Ohms at 300 mWatt output.
0.015 % on 150 Ohms at 300 mWatt output.
0.015 % on 300 Ohms at 300 mWatt output.
0.015 % on 600 Ohms at 150 mWatt output.
Signal to noise ratio 110 dB at +4 dBm input, 20 Hz/20 kHz, potentiometer on median position.
125 dB at +20 dBm input, 20 Hz/20 kHz, potentiometer on median position.
Residual noise - 115 dBm, 20 Hz/20 kHz, potentiometer on median position.
- 100 dBm, 20 Hz/20 kHz, potentiometer on maximum position.
GENERAL
Power Supply 230 Vac or 120 Vac mains voltage (set internally).
45 to 65 Hz frequency.
consumption < 10W.
FRB connector. (option 80)
CEI connector. (option 81)
Indicators left and right overload, 6 dB before clipping.
input DC voltage greater than 100mV.
Operating temperature -10 ˚C to 40 ˚C.
Storage temperature -20 ˚C to 60 ˚C.
Size 220x170x55 mm.
Weight 1600 g.

MCN AUDIO - U4410 - HEADPHONES AMPLIFIER 6
PRECAUTIONS
WARNING
To avoid risk of fire or electrical shock, do no expose this equipment to rain or excessive humidity.
Service must be performed by a qualified technician.
MAIN VOLTAGE SETTING
The mains voltage is preset to the value indicated on the rear panel.
Please check that the voltage value indicated on the rear panel matches the main network voltage.
Main voltage is set internally. To change this setting, please contact your local dealer or MCN AUDIO
technical support.
MAIN CONNECTION
Connect the power cable at the rear of the units, and check that the connector is fully inserted and
locked. Then plug the cable on a main network socket providing an earth connection.
Do not use the equipement if the power cord is damaged, if the equipment as experienced a severe
mechanial shock or if it is visually damaged.
This equipment is protected by an internal fuse. Use a fuse of the same rating in case of replacement.
SWITCHING ON
The power is applied to the amplifier by toggling the rear power switch.
In the OFF position, the unit is completely disconnected from the mains network. It can stay
connected without risk.
TEMPERATURE IN OPERATION
An increase of the case temperature is normal when the instrument is connected to the power
network and switched on.
HEADPHONES - SAFETY WARNING
The sound pressure headphones can deliver when connected to this amplifier is very high.
Avoid using headphones at a high level for a long period, as it may permanently damage
your hearing.
When used at a high level, external sounds become undetectable, specifically on closed
frame headphones. Avoid using headphones at a high level if missing external sound
signals can impair your safety.
Never connect headphones you are wearing to any output whose level is not adjusted to
zero. Residual noise at the outputs of the U4410 is almost imperceptible. Do not assume
that this absence of noise means volume controls are set to zero.
GROUND CONNECTIONS
This equipment is designed to be used with an earth connection. It must be connected only
to a main socket providing a functional earth connection.
The metallic case and the electronic ground potential of this equipment are connected to
the earth.
Even if stereophonic inputs A and B on the rear panel are independent, the ground
connection is common for both A and B connectors, and linked to the metallic case of the
instrument.

LEVEL
TO LEFT
CHANNEL
STEREO
IN RIGHT
-6dB TO CLIP LEVEL DETECTION
OVER LEFT/RIGHT
IN LEFT
LED LAMPS
AMPLIFIERS
POWER ON
POWER
SUPPLY
INPUTS
PHONES
OUTPUTS
A
B
MAINS
MCN AUDIO - U4410 - HEADPHONES AMPLIFIER 7
SYNOPTIC
Left and Right channels are identical.

LEFT
RIGHT
GROUND
MCN AUDIO - U4410 - HEADPHONES AMPLIFIER 8
FRONT PANEL
POWER ON The blue ON pilot light is lit when the unit is ON.
When the rear power switch is set to OFF, the unit is disconnected from the
power. The power cable can stay plugged in without risk.
OVER LEFT Channel LEFT overload pilot light.
This led lights when:
• the signal is 6 dB below clipping, corresponding to a 14 dBm signal on
the balanced inputs,
• the output amplifier is clipping,
• the input signal carries a DC level greater than 100mV.
OVER RIGHT Channel RIGHT overload pilot light.
This led lights when:
• the signal is 6 dB below clipping, corresponding to a 14 dBm signal on
the balanced inputs,
• the output amplifier is clipping,
• the input signal carries a DC level greater than 100 mV.
PHONES OUTPUTS Headphones 6.35 mm JACK output connectors.
Three headphones can be connected simultaneously, fed by three
independent amplifiers with independent volume controls. An internal
setting allows low impedance (50 ohms) or high impedance (600 ohms)
headphones configuration. High impedance is the default setting.

LEFT
RIGHT
GROUND
MCN AUDIO - U4410 - HEADPHONES AMPLIFIER 9
REAR PANEL - Option 81
Male XLR or 6.35 mm JACK connectors can be plugged in the input sockets.
STEREO A Stereophonic 6.35 mm JACK connector for unbalanced stereophonic input A.
STEREO B Stereophonic 6.35 mm JACK connecfor for unbalanced stereophonic input B.
Stereophonic inputs A and B are independent.
Two programs can be fed on stereophonic inputs A and B.
In such case, the sum (the mix) of these programs will be
heard on the headphones.
Even if stereophonic inputs A and B are independent, the ground connection is common
for both sockets A and B and linked to the metallic case of the unit.
IN RIGHT Balanced XLR male connector for right channel.
1 GROUND
2 HOT (+)
3 COLD (-)
IN LEFT Balanced XLR male connector for left channel.
1 GROUND
2 HOT (+)
3 COLD (-)
POWER Main power switch
CEI main input connector.
This equipment is designed to be used with an earth connection. It must be connected
only to a main socket providing a functional earth connection. The metallic case and the
electronic ground potential of this equipment are connected to the earth.

MCN AUDIO - U4410 - HEADPHONES AMPLIFIER 10
INPUT AND OUTPUT LEVELS
BALANCED INPUTS
The maximum level that can be applied on the balanced inputs is 28 dBm. Above this level, the signal
is limited by the input protection network. The purpose of this network is an active protection in case
phantom power is accidentally applied to the amplifier. The nominal input level is the standard 4 dBm.
UNBALANCED STEREOPHONIC INPUTS
The maximum level that can be applied on the unbalanced stereophonic inputs is 20 dBm.
The nominal level is 10 dBm.
These inputs can be directly connected to headphones outputs of almost any equipment with their
output level set to their midrange position.
HEADPHONES OUTPUTS
Outputs are short-circuit protected.
According to the impedance of the headphones connected, the available power ranges from 150 to
300 mWatts. An internal setting allows compensation for the level difference which is encountered
when using high and low impedances headphones of this amplifier.
BANDWIDTH
The bandwidth of the U4410 is deliberately very large, so as to minimize gain and phase alterations
which normally occur at the limits of the audible range.
An internal control loop automatically trims the bias point of the amplifiers.
This function is able to cancel a residual DC input voltage up to 200 mV. Above 100 mV of input DC
voltage, the OVER pilot lamp lights up, even if no audio signal is applied at the input.
In case the OVER pilot lamps light up as soon as the amplifier is connected to a source, even if no
audio signal is present, check for DC residual voltage at the source output. Using the U4410 on such
source can cause damage to your headphones.

MCN AUDIO - U4410 - HEADPHONES AMPLIFIER 11
INDEX
B
Balanced, 9
BALANCED INPUTS, 10
Bandwidth, 10
Bias point, 10
C
Combo, 3
Clipping, 8
D
DC level, 8
DC residual voltage, 10
E
Earth connection, 6, 9
G
Gain differences, 10
Ground, 6
GROUND CONNECTIONS, 6
H
Headphones, 8
HEADPHONES Safety Warning, 6
HEADPHONES OUTPUTS, 10
Hearing damages, 6
High impedance, 8, 10
I
Independent outputs, 3
Indicators, 3
IN LEFT, 9
Input protection, 10
IN RIGHT, 9
Internal fuse, 6
L
Low impedance, 8, 10
M
Mains network voltage, 6
Mains power switch, 9
Mains voltage, 6
Maximum level, 10
Metallic case, 6, 9
Mix, 9
N
Nominal input level, 10
O
ON pilot light, 8
Outputs, 10
OVER LEFT, 8
Overload pilot light, 8
OVER RIGHT, 8
P
Phantom power, 10
Phase shift, 10
PHONES OUTPUTS, 8
POWER, 9
Power cable, 6
Power cord, 6
POWER ON, 8
R
Rear power switch, 6
Residual noise, 6
S
Safety, 6
Short-circuit protected, 10
Sound pressure, 6
STEREO A, 9
STEREO B, 9
Stereophonic headphones, 3
Stereophonic input A, 9
Stereophonic input B, 9
T
Temperature, 6
U
UNBALANCED, 10
W
Warranty, 4
Warning, 6

MCN AUDIO - U4410 - HEADPHONES AMPLIFIER 12
MCN AUDIO
On line:
www.mcn-audio.com
Document Code : UM-EV-U4410D-V4