HEADPHONE AMPLIFIER
P-700u
HEADPHONE AMPLIFIER P-700u
Contents
Precautions ……………………………………………………………………………………………………………1
Product Characteristic ………………………………………………………………………………………………2
Names and Functions ………………………………………………………………………………………………4
Mem ory ……………………………………………………………………………………………………………… 6
Connections …………………………………………………………………………………………………………7
Before Making Connections …………………………………………………………………………………………8
Block Diagram ………………………………………………………………………………………………………9
Specifications ………………………………………………………………………………………………………10
Troubleshooting ……………………………………………………………………………………………………11
3
Precautions
Installation place
This unit should be installed in a well-ventilated place to
allow for easing air circulation. Do not install this unit at a
place where it would come under direct sunlight or where
the high temperatures are expected like close to a heater.
Keep the unit away from places where humidity level is high
or excessive dust is present, this may cause malfunction of
the unit.
Cautions in connecting input components
When connecting this product to a source like a CD player,
be sure to turn off this device and the connecting source.
Failure to observe this may generate a pop noise resulting
in headphone damage or temporary malfunction.
Make sure to insert the plug-pin firmly in the each input
terminal of this product, failure to do so will give rise to
inadequate grounding resulting in distorted output signals
with a high signal to noise ratio.
Protection circuit
This product is equipped with a protection circuit that guards
against over-current, abnormally high temperatures and DC
drift. When the protection circuit is activated, the output to
the headphone is terminated and the operation light blinks
to indicate the status of the product to be in mute mode.
If the protection circuit is frequently activated after a
lapse of a certain me and turning on the power again,
please consult your dealer.
Repair and adjustment
There are no user servable parts inside the unit, please
do not attempt to open it yourself, doing so will void your
warranty. When repairs or adjustments are needed, please
consult your dealer or the authorized local distributor.
Cleaning
The amplifier should only ever be cleaned with a soft dry
cloth to remove finger marks, etc… Do not use a solvent
like benzene or thinner because such a substance can
often damage the exterior.
Pay attention to use the headphone
For a long time continuous use ear stimulating the volume,
may cause damage to hearing.
Sound is not generated immediately after
the power supply is turned on.
This amplifier is equipped with a mute circuit which is
activated for a short period of time at switch on. Therefore,
no sound is generated shortly after the power supply is
turned on. Please be pati ent and do not increas e the
volume during this period as this will suddenly generate a
highly amplied sound. It is advised that the volume control
be set to a low level at rst and adjusted once you hear the
sound from you headphones.
1
Product Characteristic
HEADPHONE AMPLIFIER P-700u
3 Darlington output section
Made up of Bipolar Transistor’s 3 section Darlington.
Balance: 8 w + 8w (16Ω) and Unbalance: 4w + 4w (8Ω)
rated output.
Can be corresponding to the Balance of
the headphone is high quality Balance/
unbalance headphone
It has the same independent quality of 4 channel discrete
'amplier, corresponding XLR can balance headphone.
Transfer the balance input and output can be straight,
unbalance is L/R2 straight transmission on the channel in
parallel connection, the composition has a strong driving
force.
It can also be corresponding to the balance of input and
unbalance, headphone, unbalance input to the balance of
the headphone.
LECUA – LUXMAN Electric Controlled Ultimate
Attenuator
Mount with Electrically controlled attenuator for gaining
attenuation amount in combination with the resistance.
By using the dedicated solid state IC to control the
attenuator to the sound volume corresponding to the angle
of the volume knob, the operation texture similar with
conventional slide-type volume is realized.
And balance phase of the power amplifier, correlation
of inverse phase error function also is very good, can
accurately control the balance.
High inertia power source
High-inertia elec tronic circuit that combines a large-
capacity OI-core-type power transformer with customizable
10,000μFⅹ2 capacitor blocks.
Parallel speaker relay
Will be used 2 the company merger borne power amplier,
low impedance value of large Speaker relay in parallel,
reduces the headphone output impedance of the line.
B-line construction
Newly designed beeline construction composes the audio
input signal via the optimally shortest route to the output.
Selector relay
Ad opted power amplifier used by t he co mp any c an
improve the high quality of separation and crosstalk
performance Selector relay.
Schottky barrier diode
Application of schottky barrier diode manufactured by
Nihon Inter Electronics Corporation that has less switching
noises and higher conversion efciency to the DC voltage
for the power supply rectier circuit.
Original OFC wire
Our original OFC wires are used in the internal wiring to
achieve smooth signal transmission thanks to the spiral
wrap shielding on each core and the non-plating process
on the core wire.
ODNF – Only Distortion Negative Feedback–
The amplification feedback circuit that has acquired the
high-speed primary slew rate and ultra-high bandwidth by
feeding back only distortion components generated during
amplification to maintain the pure sound quality of the
main-amplier that is almost non-feedback.
The n e wes t ver s ion , 3.0 A , has achi e ved t he lo w
impedance and high S/N ratio of the transmission circuit
by parallelization of the first and second stages of the
error detection circuit are parallelized to moderate the
frequency characteristic and noise.
2
Round pattern circuit board
After careful consideration of delicate audio signal flow,
around pattern board has been applied to achieve smooth
signal transmission.
Sensitivity switch
This machine is equipped with can match the headphone
power used in HIGH/MID/LOW sensitivity selector switch.
Through output switch
The LINE of the input signal can through the output of the
output terminal to set on/off.
Rooess chassis structure
This unit consists of the independent construction of a
loopless chassis to eliminate increased ground impedance
caused by chassis current.
18mm pitch RCA terminal
Introduction of 18mm pitch all RCA input/output terminals
allows even a high-performance line cable with large plug
to be connected.
Balance type headphone terminals
Non-locking type’s high quality XLR terminals have both of
reliability and safety.
Unbalance type headphone terminals
Using two high quality headphone terminal.
New standard size
Using the design is 440mm wide, new size panel height is
80mm high rigid frame (chassis).
AC inlet
This inlet enables the connection with an external power
cable.
About balance type headphone, headphone amplier
※
The balance type of headphone is to point to by positive phase (HOT) and reverse phase (COLD) drive headphone driver unit,
·
congurable L/R earth (COLD) isolated four core type of headphone. Generally USDS is XLR3pin type of balance connector.
Balance headphone amplier has the 4 channel amplier, HOT and COLD in each L ch and R ch, XLR’s balance headphone
·
terminal signal conguration has shown in below.
(1) GROUND
(2) HOT (positive phase)
(3) COLD (inverse phase)
3
1 2 10753 4 8 96
Names and Functions
Front panel
HEADPHONE AMPLIFIER P-700u
1. Operation indicator
Blinks in the time muting mode when the power switch
is turned on and lights up when the operation state is
activated.
2. Power switch (OPERATION)
Toggle the power on and off.
When wiring or connection is performed, be sure to turn off
this switch.
3. Input selector (INPUT)
Selector switch for line or balance input.
4. Through out switch (THROUGH OUT)
Through out on/off switch.
Line input signal pass through to line out in the rear panel,
for connected to other amplier or sources.
5. Headphone jack (UNBAL)
Insert the use headphone plug-in. Two jack can output the
same music signal, please use the impedance for more
than 8 Ω headphone jack. If use two jack at the same time,
please use the impedance for more than 16 Ω headphone.
6. Balance headphone terminals (BAL L/R)
Insert the balance used type of headphone XLR connectors.
Please use the impedance for more than 16 Ω headphone.
This machine is the balance of the output terminal can
output the following signals.
GROUND
①
HOT
②
COLD
③
7. Headphone output switch (OUTPUT MODE)
It can choose a headp ho ne outpu t ter minal’s of the
unbalance (UNBAL) and the balance (BAL) output terminal
of the output switch. Each button can switch the headphone
output of unbalance and balance.
Selec t the unb alanc e (UNBAL) or the b alanc e (BAL),
ingicator will bright lights.
8. Sensitivity switch (SENSITIVITY)
The headphone according to use the power switch can be
HIGH, MID and LOW.
Headphone power is low, if large volume control volume is
still insufcient, can be set to HIGH.
On the other hand, if the headphone power is high, the
volume control is not easy to control, is set to LOW.
The sensitivity of the machine set for the following.
HIGH: 0dB
MID: -6dB
LOW: -12dB
9. Balance control (BALANCE)
Ad just the b alance of so und betwe en r ig ht a nd l eft
channels. Rotating this switch counter clockwise causes the
left sound volume to be enhanced, and rotating the switch
clockwise causes the right sound volume to be enhanced.
This switch shall be set to the centre position under normal
conditions and rotated to make adjustment if necessary.
10. Volume control (VOLUME)
Adjust the sound volume. Sound is not generated when
this control is rotated counter clockwise to the end, and
then, the sound volume gradually becomes higher when the
control is slowly rotated clockwise.
4
151311 14
12
Names and Functions
Rear panel
11. Input terminals (BAL LINE-1, BAL LINE-2)
Are the balance type input terminals of the LINE level for
an XLR connector (Cannon connector)
12. Phase switch (PHASE)
Change the phase when the balance input terminal is
used. The phase shall be corresponding to the phase of
the input device.
Normal position ........①GROUND
②COLD
③HOT
Invert position ...........①GROUND
②HOT
③COLD
13. Input terminal (LINE)
Line input terminals for RCA connector.
14. Output terminal (THROUGH OUT)
Line input signal pass through line output, for connected
to other amplier or sources.
15. AC inlet (AC IN)
Connect the accessory power cable.
The power should be obtained from an AC out let.
5
Memory
Memory
After turn off the power supply of the machine, the
following content will memory.
THROUGH OUT on/off
OUTPUT MODE UNBAL/BAL
HEADPHONE AMPLIFIER P-700u
6
HEADPHONE (UNBAL)
HEADPHONE (BAL)
CONTROL AMP
USB DA
CONVERTER
CONTROL AMP
MAIN AMP
SPEAKER
SYSTEM
CD PLAYER
SACD PLAYER
L
R
L
R
L
R
L
L
R
R
L
R
PC／Mac
L R
Connections
7
Before making connections
Before making connections
Before connecting other devices, connect the accessory
power cable to the AC inlet of this unit. Turn off the power
switch of this unit and the power supplies of the connected
devices to prevent unexpected noise.
How to connect power supply
Use the accessory power cable and insert the AC plug in
an outlet on the wall.
How to connect CD player or other devices
Connect the output terminals of a CD player or TAPE
player (rec out) to line input of this unit, used RCA cables
or BALANCE cables.
Phone out
Connect for headphone with 8ohms or above.
Two sets of headphone can be used.
Through out (line) connection
Input signal pass through line output can be used to
connect with amplier or other devices.
HEADPHONE AMPLIFIER P-700u
8
Block Diagram
→
→
−B2
−B1L
−B1L
−B2'
For μ-Com./Acc.
For AC SENSOR
μ-Computer
LECUA
Protector
DC./OC.
RECTIFIER
Volume/Balance
−1
Buffer
−B2'
−B1L
−B1R
-B1R
−B2
−B2'
−B2
−B2'
−B2
−B2'
Input/Sensitivity
Lch COLD
Rch COLD
→
→
→
→
→
−
−B2'
−B2'
−B2'
−B2'
Volume/Balance
/Sensitivity
−B1R
→
9
Specications
HEADPHONE AMPLIFIER P-700u
Continuous power output
Input sensitivity
Input impedance
Total harmonic distortion
S/N ratio
Frequency response
Accessories
Power supply voltage
Power consumption
Max. external dimensions
Net Weight
UNBAL 4W + 4W (8Ω), 1W + 1W (32Ω)
BAL 8W + 8W (16Ω), 4W + 4W (32Ω)
LINE → UNBAL : 1V (SENSITIVITY HIGH)
BAL LINE → BAL : 2V (SENSITIVITY HIGH)
LINE → UNBAL : 2V (SENSITIVITY HIGH)
BAL LINE → BAL : 1V (SENSITIVITY HIGH)
LINE :15kΩ (THROUGH OUT OFF)
BAL LINE : 40kΩ
LINE
BAL LINE → BAL : 0.0020% (16Ω, 1kHz, 1W)
LINE → UNBAL : >110dB
BAL LINE → BAL : >115dB
LINE → UNBAL : 20Hz~20,000Hz (+0, -0.1dB)
: 10Hz~170,000Hz (+0, <-3dB)
BAL LINE → BAL : 20Hz~20,000Hz (+0, -0.1dB)
: 10Hz~170,000Hz (+0, <-3dB)
owner's manual
safety cautions
230V~50Hz
40W
27W (at no input)
440 (W) x 92 (H) x 400 (D) mm
12.7kg
UNBAL : 0.0035% (8Ω, 1kHz, 1W)
→
* Specications and appearance are subject to change without notice.
10
Troubleshooting
While the unit is used, an unusual phenomenon may be confused as a malfunction for a certain reason. Prior to asking
us for repair services, please check the table below and read the instruction manual for the subsidiary devices. If the
cause of the malfunction cannot be identified, please contact your dealer.
Problem Cause Solution
No power is supplied
even though the power
switch is pressed
No sound is generated
The power plug is disconnected
from the wall outlet, or it is not
completely inserted.
·
The power plug is disconnected
from the AC inlet, or it is not
completely inserted.
·
Insert the power plug in the wall
outlet securely.
·
Insert the power plug in the AC
inlet securely.
·
The volume control is set to
minimum level.
·
Rotate the volume control
clockwise to adjust the sound
volume.
·
Cable connections are incomplete.
·
Make cable connections securely.
·
The input selector is not set to the
input source.
·
Set the input selector to the input
source.
·
The output level of the input device
is set to the minimum.
·
Adjust the output level.
·
No sound is generated
on one side
The balance control of the input
source is fully rotated.
·
The balance control shall be set
to the center.
·
The connecting cable is connected
on one side only.
·
Make cable connections securely.
·
Through out line no
signal
Through out switch set to off.
·
Set the through out switch to on.
·
Humming sound
(boon or zzz noise) is
generated
The ground side of the pin-plug
cable has no contact with the
terminal.
·
Make connection securely so that
the ground side of the pin-plug
cable can be connected.
·
Induction noise is picked up from
another device.
·
Install it distant from other
devices.
·
The power cables are laid too
close to the signal cables.
·
Provide sufficient spacing
between the power cables and
the signal cables.
·
11
LUXMAN CORPORATION, JAPAN
AG00987E08A
Printed in China
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