Luxman L-550AXII Owner's Manual
Luxman L-550AXII is a high-fidelity integrated amplifier that delivers pure, detailed sound with a wide range of connectivity options for various audio sources. Equipped with advanced technologies like LECUA-WM, ODNF, and a high-inertia power supply, it ensures exceptional audio performance. With its selector switch IC and parallel speaker relays, the L-550AXII provides precise volume control and efficient power distribution.
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INTEGRATED AMPLIFIER
L-550AX
Owner`s Manual
Contents
Precautions·············································································································· 1
Features·of·This·Unit································································································· 2
Names·and·Functions······························································································· 4
Connections··········································································································· 12
Operations·············································································································· 16
How·to·Use·Remote·Control··················································································· 18
Block·Diagram········································································································ 20
Specifications········································································································· 21
Before·Asking·for·Repair·Services··········································································· 22
Precautions
INTEGRATED AMPLIFIER L-550AX
Installation place
This·unit·shall·be·installed·in·a·well-ventilated·and·effectively· heat-released·place·because·this·unit·is·an·A-class·amplifier· and·generates·considerable·heat.·
Especially,· installation· of· this· unit· where· direct· sunlight· is· present,·where·the·temperature·rises·excessively·high·such· as·close·to·a·heater,·or·where·it·is·humid·or·dusty·may·cause· a·malfunction·even·if·heat·is·efficiently·released.·Therefore,·do· not·install·this·unit·in·such·places.·
Ventilation holes
The·ventilation·holes·on·the·top·and·bottom·boards·of·this· product·must·not·be·blocked·because·this·unit·is·an·A-class· amplifier·and·generates·considerable·heat.·If·the·amplifier·is· installed·on·a·rack·or·the·like,·secure·ample·space·for·cooling· and·leave·the·door·open.·Do·not·pile·up·other·things·on·the· amplifier·and·never·put·articles·on·it.·Failure·to·observe·this· may·cause·a·malfunction.·
Note:
For·heat·dispersal,·do·not·install·this·equipment·in·a·confined· space·such·as·a·book·case·or·similar·unit.
*
*
Note
*
*
Wall
Precautions in connecting with other components
When· connecting· this· unit· to· input· devices· such· as· a· CD· player,·an·SACD·player,·a·tuner,·and·a·recorder,·be·sure·to· turn·off·the·power·of·this·unit·and·all·other·connected·devices.·
Failure·to·observe·this·may·generate·a·strong·noise·resulting· in·speaker·damage·or·cause·a·malfunction.·
The·pin-plug·to·be·inserted·in·each·input·terminal·of·this·unit· shall· be· pushed· in· firmly.· If· the· grounding· terminal· is· inadequately·connected,·noises·including·hum·may·be·generated,· resulting·in·an·adverse·S/N·ratio.·
Cautions in connecting speakers
When· making· speaker· system· connections,· exercise· extra· care·not·to·short-circuit·between·!·and·@·of·the·speaker·terminals·and·speaker·input·terminals·of·this·unit.·If·a·large·signal· is·applied·to·the·amplifier·with·its·circuit·left·short-circuited,·a· large·current·may·be·passed·through·the·output·circuit·and· cause·a·malfunction.
The sound is not generated shortly after the power supply is turned on.
This·amplifier·is·equipped·with·a·time·muting·circuit·in·order·to· separate·the·output·circuit.··Therefore,·no·sound·is·generated· shortly·after·the·power·supply·is·turned·on.·
If·the·volume·control·is·moved·to·a·high·sound·level·before· the·time·muting·circuit·is·canceled,·a·large·sound·is·suddenly· generated.·Please·be·advised·that·the·volume·control·shall·be· set·to·a·low·level·at·first·and·adjusted·after·sound·comes·out· of·the·speakers.·
Protection circuit
This·product·is·equipped·with·a·protection·circuit·that·is·activated·upon·detection·of·overcurrent,·abnormally·high·temperature,·and·DC·drift·to·protect·the·amplifier·and·speakers.·
When· the· protection· circuit· is· activated,· the· output· to· the· speaker·terminal·is·shut·off·and·the·standby·indicator·blinks·to· show·that·this·unit·is·in·the·muting·state.·If·the·protection·circuit·is·frequently·activated·even·when·disconnecting·the·power·plug·from·the·wall·outlet·and·turning·on·the·power·again· after·a·lapse·of·a·certain·time,·please·consult·your·dealer.·
Batteries
Caution:
Batteries·used·for·remote·controller·shall·not·be·exposed·to· excessive·heat·such·as·sunshine,·fire·or·the·like.
Repair and adjustment
When· repairs· or· adjustments· are· needed,· please· ask· the· dealer·where·you·bought·the·unit.·
Cleaning
For·cleaning,·use·a·piece·of·soft·cloth·to·wipe·the·unit·such·as· cleaning·cloth·available·on·the·market.·If·the·unit·has·become· very·dirty,·remove·the·dirt·with·soft·cloth·absorbing·a·small· amount·of·neutral·detergent,·and·then·wipe·the·unit·with·dry· cloth.·Do·not·use·a·solvent·like·benzine·or·thinner·because· such·a·substance·can·often·damage·the·exterior.
1
2
Features of This Unit
LECUA-WM - LUXMAN Electric Controlled
Ultimate Attenuator - Waiting Matrix
Application·of·the·system·to·obtain·attenuation·by·combining·2·fixed·resistances·connected·to·this·product·series·has· improved·efficiency·of·the·LECUA1000·attenuator·used·in·our· flagship·model,·C-1000f.·
The· shortest· signaling· route· has· been· achieved· by· the· integrated· amplifier· circuit· thanks· to· the· 3D· structure· of· the· mounting·boards.·
Controlling·LECUA-WM·to·the·level·equal·to·the·volume·position· detected· by· a· microprocessor· has· achieved· the· operation·feeling·similar·to·our·conventional·sliding-type·volume· controls.·
ODNF - Only Distortion Negative Feedback -
The·amplification·feedback·circuit·that·has·acquired·the·highspeed·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-amplifier· that·is·almost·non-feedback.·
The·newest·version,·3.0A,·has·achieved·the·low·impedance· and·high·S/N·ratio·of·the·transmission·circuit·by·parallelization· of·the·first·and·second·stages·of·the·amplifier·circuit.·
In·addition,·the·input·stages·of·the·error·detection·circuit·are· parallelized· to· moderate· the· frequency· characteristic· and· noise.·
2 parallel push-pull output stages
2·parallel·push-pull·structure·of·bipolar·transistor.
Pure·class·A·rated·output·20W+20W·(8Ω).·
High-inertia power supply
High-inertia·electronic·circuit·that·combines·a·large-capacity·
EI-core-type·power·transformer·with·customizable·10,000μF·
×·4·capacitor·blocks.·
Parallel speaker relays
This·unit·is·equipped·with·large·type·of·2·parallel·speaker·relays·with·a·low·resistance·value·to·reduce·the·impedance·of· the·speaker·output·lines.·
Beeline construction
Newly· designed· beeline· construction· composes· the· audio· input· signal· via· the· optimally· shortest· route· to· the· speaker· output.·
Selector switch IC
Selector·switch·IC·with·high·sound·quality,·which·is·used·in· the·top-end·control·amplifier,·C-1000f,·improves·the·separation·and·crosstalk·performances.·
Schottky barrier diode
Application·of·schottky·barrier·diode·manufactured·by·Nihon·
Inter·Electronics·Corporation·that·has·less·switching·noises· and· higher· conversion· efficiency· to· the· DC· voltage· for· the· power·supply·rectifier·circuit.·
LUXMAN’s original OFC wires
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.·
INTEGRATED AMPLIFIER L-550AX
Round pattern board
After· careful· consideration· of· delicate· audio· signal· flow,· a· round·pattern·board·has·been·applied·to·achieve·smooth·signal·transmission.·
Phono amplifier
This·unit·is·equipped·with·a·phono·amplifier·that·is·compatible·with·the·MM/MC·cartridge·to·achieve·analog·record·reproduction·in·a·high-grade·level·without·adding·a·dedicated· phono·amplifier.·
Separate function
This·unit·is·equipped·with·a·separate·switch·to·separate·the· pre-amplifier·and·power-amplifier·each·other·that·enables·the· bi-amp·connection·adding·a·power-amplifier·and·the·coexistence·with·an·AV·system.·
Loopless chassis structure
This· unit· consists· of· the· independent· construction· of· a· loopless· chassis· to· eliminate· increased· ground· impedance· caused·by·chassis·current.·
18 mm pitch RCA terminal
Introduction· of· 18· mm· pitch· all· RCA· input/output· terminals· allows·even·a·high-performance·line·cable·with·large·plug·to· be·connected.·
Large type of speaker terminals
Speaker· terminals· (A· and· B· systems)· of· inline· layout· (with· same·characteristics·for·right·and·left),·which·is·compatible· with·Y·lugs·and·banana·plugs·to·enable·easy·connection·with· extra-thick·speaker·cables.·
New standard size
This·unit·has·been·manufactured·based·on·LUXMAN's·new· standard·size·(440mm·wide,·common·with·a·series·of·separate·amplifiers·and·a·series·of·SACD·players.·
Headphone output terminal
This·terminal·allows·you·to·casually·enjoy·sound·even·at·midnight.
AC inlet
This·inlet·enables·the·connection·with·an·external·power·cable.·
Needle-type meter
This· unit· is· equipped· with· needle-type· meters· lighted· with·
LED,·which·improves·the·visibility·in·the·room·where·the·unit· will·be·installed.·
Remote control encased in aluminum
The· high-grade· remote· control,· which· is· encased· in· aluminum,·can·control·applicable·CD/SACD·players.
3
Names and Functions
Front panel
1 2 3 4 5 6 7
4
17 16 15 14 13 12 11 10 9 8
1. Operation switch (OPERATION)
Toggles·the·power·on·and·off.·
When·wiring·or·connection·is·performed,·be·sure·to·turn·off· this·switch.·
2. Operation indicator (OPERATION)
Blinks· in· the· time· of· muting· mode· when· the· operation· switch·is·turned·on·and·lights·up·when·the·operation·state· is·activated·afterward.·This·indicator·blinks·when·the·unit·is· in·the·muting·mode·or·when·the·volume·is·adjusted·with·the· remote·control.·
3. Input selector (INPUT SELECTOR)
Selects·an·input·device·from·the·devices·such·as·a·CD·player,·an·SACD·player·and·a·tuner·connected·to·each·input· terminal.·
The· input· selector· has· 6· positions· consisting· of· LINE-4,·
LINE-3,·LINE-2,·LINE-1,·BAL·LINE,·and·PHONO·from·left· to·right·that·correspond·to·each·input·terminal·on·the·rear· panel.·The·knob·is·rotated·to·light·the·input·indicator·of·the· input·device·to·be·selected.
4. Input indicator
Lights·up·at·the·input·device·to·be·selected·with·the·input· selector·or·remote·control.
INTEGRATED AMPLIFIER L-550AX
5. Display
Displays·the·operation·status·of·this·unit.
This·display·is·composed·of·7·indicators·and·2·power·meters.·
6. Remote control infrared receiver
(REMOTE)
This·is·a·sensor·to·receive·signals·from·the·accessory·remote·control.·
7. Volume control (VOLUME CONTROL)
Adjusts· the· sound· volume.· Sound· is· not· generated· when· this· control· is· rotated· counterclockwise· to· the· end,· and· then,·the·sound·volume·gradually·becomes·higher·when·the· control·is·slowly·rotated·clockwise.·
8. Headphone jack (PHONES)
Insert·the·headphone·plug·into·this·output·jack.·Even·when· the·plug·is·inserted,·signals·to·the·speaker·output·terminal· are·not·interrupted.·Accordingly,·to·listen·to·sound·with·only· use·of·headphones,·set·the·speaker·selector·to·off.·
9. Separate switch (SEPARATE)
Separates·the·pre-amplifier·and·main-amplifier·each·other.· off·:·
(separate·· indicator·off) on·:·
(separate·· indicator·on)
·Uses·this·unit·as·a·normal·pre-main·amplifier.
·Feeds·external·signals·from·the·MAIN·IN·terminal·on·the·rear·panel·to·the·main-amplifier·section.
•
··Every·pressing·of·this·switch·toggles·the·separate·on·and· off.·
The·separate·indicator·lights·up·when·the·separate·switch· is·on.
When the separate switch is set to on, the volume control of this unit cannot adjust the volume of the speakers connected to this unit. Volume adjustment shall be performed at the input device side such as the control amplifier connected to the MAIN IN terminal.
Entry of direct output into the MAIN IN terminal from a CD player or other devices that cannot adjust sound volume constantly provides a full power state and accordingly results in the risk of speaker damage.
For such input devices, be sure to use a control amplifier equipped with the sound volume adjustment function as a relay, generate sound through the speakers with volume lowered, and adjust the volume to your favorite level.
When arranging the wiring, be sure to turn off the power of this unit.
5
Names and Functions
Front panel
1 2 3 4 5 6 7
17 16 15 14 13 12 11 10 9 8
6
10. Line straight switch (LINE STRAIGHT)
Enhances·the·purity·of·the·sound·quality·by·bypassing·the· balance·control·circuit,·tone·control·circuit,·or·the·like.· off·:·
(line·straight·· indicator·off)
·Line·straight·off/bypass·off on·:·
(line·straight·· indicator·on)
·Line·straight·on/bypass·on
•··Every·pressing·of·this·switch·toggles·the·line·straight·on· and·off.
The·line·straight·indicator·lights·up·when·the·line·straight· switch·is·on.·
When the line straight switch is set to on, the balance control, tone control, subsonic, monaural and loudness cannot be adjusted and the mode selector does not function.
11. Balance control (BALANCE)
Adjusts·the·balance·of·sound·volume·between·right·and·left· channels.·
Rotating·this·switch·counterclockwise·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·center·position·under·normal· conditions,·and·rotated·to·make·adjustment·if·necessary.·
When·the·line·straight·switch·is·set·to·on,·this·switch·does· not·function.·
12. Tone control for treble (TREBLE)
Controls·the·frequency·characteristics·in·the·high-frequency· range.·
When·this·switch·is·set·to·the·center·position,·flat·frequency· characteristic· is· obtained.· Rotating· the· switch· clockwise· causes· the· high-frequency· range· to· be· enhanced,· and· rotating· the· switch· counterclockwise· causes· the· high-frequency·range·to·be·attenuated.·
When·the·line·straight·switch·is·set·to·on,·this·switch·does· not·function.·
INTEGRATED AMPLIFIER L-550AX
13. Tone control for bass (BASS)
Controls·the·frequency·characteristics·in·the·low-frequency· range.·
When·this·switch·is·set·to·the·center·position,·flat·frequency· characteristic· is· obtained.· Rotating· the· switch· clockwise· causes·the·low-frequency·range·to·be·enhanced,·and·rotating·the·switch·counterclockwise·causes·the·low-frequency· range·to·be·attenuated.·
When·the·line·straight·switch·is·set·to·on,·this·switch·does· not·function.·
14. Speaker selector (SPEAKERS)
Selects·either·of·2·speaker·systems,·A·or·B,·located·at·the· rear·panel.·
OFF:· ·Activates· only· headphones.· No· sound· is· generated·from·any·speakers.·
A:·
(center)
B:·
Selects·the·A·system·speaker·terminal.·
Selects·the·B·system·speaker·terminal.·
A+B:· ·Simultaneously· activates· both· A· and· B· system· speakers.· When· both· speaker· terminals· are· simultaneously·used,·select·speakers·with·impedance· of· 8· ohms· or· more· because· both· output· terminals·are·connected·in·parallel.·
15. Recording switch (REC OUT)
Sends·recording·signals·to·the·recorder·connected·to·this· unit.·
·
OFF:·· ·Does·not·send·recording·signals·to·the·recorder· output·terminals·on·the·rear·panel.·
·When· not· using· the· recorder,· set· the· recording· switch·to·this·position.·
ON:· ·Selects·an·input·source·to·be·recorded·with·the· input·selector·and·sends·recording·signals·to·the· recorder·connected·the·recorder·output·terminals· of·this·unit.·
16. Cartridge selector (CARTRIDGE)
Changes·the·gain·level·of·the·equalizer·amplifier·(amplifier· circuit·required·to·play·an·analog·record).
·
MC:·
MM:·
·Selects·an·MC·(moving·coil)·type·cartridge·of·low· output·voltage.·
·Be·aware·that·the·sound·volume·becomes·higher· and·unbalanced·sound·without·high·frequencies· is·generated·owing·to·the·impedance·when·“MC”· is·selected·during·use·of·the·MM·type·cartridge.·
·Selects·an·MM·(moving·magnet)·type·cartridge·of· high·output·voltage.·
17. Monitor switch (MONITOR)
Toggles·between·use·and·nonuse·of·the·monitor·input·terminals·(MONITOR)·on·the·rear·panel.
on·:·
(monitor·· indicator·off)
Enables·to·reproduce·the·data·from·the·recorder.· off·:·
(monitor·· indicator·on)
·Enables·to·reproduce·the·data·from·the·source· selected·with·the·input·selector.
•··Every·pressing·of·this·switch·toggles·the·monitor·on·and· off.
The·monitor·indicator·lights·up·when·the·monitor·switch· is·on.
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8
Names and Functions
Display
2 6 2
1 3 4 5 7 8 9
1. Monitor indicator (MONITOR)
Lights·up·when·the·monitor·switch·is·on.·
2. Power meters
The·left·meter·reads·the·output·of·the·L·channel,·and·the· right·meter·reads·the·output·of·the·R·channel.·The·meters· read·the·level·in·decibels.
The·meters·light·when·the·power·is·on.·
3. Subsonic indicator (SUBSONIC)
Lights·up·when·the·subsonic·switch·is·on.·
4. Monaural indicator (MONO)
Lights·up·when·the·monaural·switch·is·on.·
The subsonic, monaural and loudness can be toggled only from the accessory remote control (RA-17).
INTEGRATED AMPLIFIER L-550AX
5. Standby indicator (STAND BY)
Lights·up·when·the·AC·plug·is·plugged·into·a·wall·socket· and·the·operation·switch·is·set·to·off.·
This·indicator·turns·off·when·the·AC·plug·is·disconnected· from·the·wall·socket·or·the·power·switch·is·set·to·on.·This· indicator·blinks·when·the·protection·circuit·is·activated.·
6. Remote sensor (REMOTE)
Receives·signals·from·the·accessory·remote·control.·
7. Loudness indicator (LOUDNESS)
Lights·up·when·the·loudness·switch·is·on.·
8. Line straight indicator (LINE STRAIGHT)
Lights·up·when·the·line·straight·switch·is·on.·
When the line straight switch is set to on, the subsonic, monaural and loudness cannot be adjusted from the accessory remote control.
When one of these switches is pressed, the line straight indicator blinks for 3 seconds to show that this unit cannot be operated.
Adjust the subsonic, monaural or loudness after setting the line straight switch to off.
9. Separate indicator (SEPARATE)
Lights·up·when·the·separate·switch·is·on.·
The subsonic, monaural and loudness can be toggled only from the accessory remote control (RA-17).
9
10
Names and Functions
Rear panel
1 2 3 4 5 6 7
8
10 9
1. Signal ground (ground terminal)
(SIGNAL GROUND)
Is·a·ground·terminal·for·devices·to·be·connected·to·this·unit.·
This·terminal·is·used·to·reduce·noise·when·other·devices· are·connected.·This·terminal·is·designed·not·for·safety.·
2. Phono input terminal (PHONO)
Is·an·input·terminal·to·connect·an·analog·record·player.·
Do not connect a CD player or other devices whose output level is high.
Normal playback cannot be achieved due to sound crack.
3. LINE-1, LINE-2, LINE-3, and LINE-4 input terminals (unbalance)
(LINE-1, LINE-2, LINE-3, LINE-4)
Are·used·for·high-level·signal·inputs·from·a·CD·player,·an·
SACD·player,·a·tuner,·a·DVD·player,·a·TV,·and·other·such· devices.·The·input·sensitivity·is·180·mV,·and·the·impedance· is·42·kohms.·These·input·terminals·offer·the·same·functions.·
4. Recorder input/output terminals (REC)
Connect· the· audio· input/output· of· a· recorder.· The· audio· input·of·a·recorder·is·connected·to·REC·OUT,·and·the·audio· output·of·a·recorder·is·connected·to·MONITOR.·
Do not insert shortpin plugs into REC OUT.
No sound is generated.
INTEGRATED AMPLIFIER L-550AX
5. Pre-out terminal (PRE OUT)
This·terminal·is·used·to·obtain·the·output·of·the·preamplifier.·
A·bi-amp·connection·can·be·performed·with·a·combination· of·an·external·power·amplifier·because·this·terminal·always· provides·output·regardless·of·the·separate·switch·setting.
Do not insert shortpin plugs into PRE OUT.
No sound is generated.
6. Main in terminal (MAIN IN)
Provides·input·to·the·main-amplifier·section·when·the·preamplifier· and· main-amplifier· are· separated· by· setting· the· separate·switch·to·on.·
7. Balance input terminals (BAL LINE)
Are·the·balance·type·input·terminals·of·the·LINE·level·for·an·
XLR·connector·(Cannon·connector).
8. Phase inverters (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· â‘ ·GROUND
②·COLD
·Invert·position·
③·HOT
â‘ ·GROUND
②·HOT
③·COLD
9. AC inlet (AC IN)
Connects·the·accessory·power·cable.·The·power·shall·be· supplied·from·a·household·wall·socket.·
10. Speaker terminals (SPEAKERS)
Connects·a·speaker·system.·
The·right·speaker·terminal·shall·be·connected·to·the·R·side,· and· the· left· speaker· terminal· shall· be· connected· to· the· L· side·in·consideration·of·the·polarity.
General type terminal
* It is possible to insert cables from below as well as from above.
11
Connections
CD/SACD PLAYER CD/SACD PLAYER
RECORDER
12
+ – + – + – + –
ANALOG PLAYER
L R
SPEAKER SYSTEM(A)
L R
SPEAKER SYSTEM(B)
INTEGRATED AMPLIFIER L-550AX
How to connect power supply
Use·the·accessory·power·cable·and·insert·the·AC·plug·in·an· outlet·on·the·wall·in·the·room·where·the·unit·will·be·installed.
How to connect CD player, SACD player, tuner, or other devices
Connect·between·the·output·terminals·of·a·CD·player,·an·
SACD·player,·a·tuner,·or·other·such·input·devices·and·the·
LINE-1·input·terminals·of·this·unit·with·2·(R·and·L)·pin-plug· cables·or·balanced·cables.
For·LINE-2,·LINE-3,·and·LINE-4·input·terminals,·connection· in· the· same· fashion· as· the· LINE-1· terminals· provides· the· reproduction·likewise.·
How to connect speakers
Connect· the· left-channel· speaker· to· the· LEFT· SPEAKER· terminal· of· this· unit· and· the· right-channel· speaker· to· the·
RIGHT·SPEAKER·terminal.·
Securely·connect·the·!·terminal·of·the·speaker·system·to· the·speaker·terminal·!·(red)·of·this·unit,·and·the·@·terminal· of·the·speaker·system·to·the·speaker·terminal·@·(black)·of· this·unit.·
If·the·!·and·@·terminals·are·reversely·connected·to·either· of·the·right·and·left·speaker·systems,·the·acoustic·phases· of· the· sound· reproduced· from· the· right· and· left· speaker· systems·are·also·reversed.·In·such·a·case,·be·aware·that· the· sound· level· in· the· low· range· will· be· reduced· and· the· acoustic· stability· will· worsen,· thus· failing· in· normal· stereo· playback.
13
Connections
CD/SACD PLAYER CD/SACD PLAYER
RECORDER
14
+ – + – + – + –
ANALOG PLAYER
L R
SPEAKER SYSTEM(A)
L R
SPEAKER SYSTEM(B)
INTEGRATED AMPLIFIER L-550AX
How to connect record player
Connect·between·the·output·terminal·of·an·analog·record· player·and·the·PHONO·terminal·of·this·unit·with·2·(R·and·L)· pin-plug·cables.
For·some·types·of·players,·the·ground·wire·from·the·phono· motor·or·the·tone·arm·should·be·connected·to·the·ground· terminal·of·this·unit.·
The·phono·equalizer·of·this·unit·uses·the·MM·or·MC·cartridge.·If·an·MC·cartridge·with·low·output·voltage·is·used,· set·the·cartridge·selector·on·the·front·panel·to·the·MC·position.
The output from a record player equipped with a phono equalizer or from an independent phono equalizer shall be connected to the line input terminals of this unit.
How to connect recorder
1. Connection to monitor terminal
(playing)
Connect·between·the·line·output·terminals·(LINE·OUT)·of·a· recorder·and·the·monitor·terminals·of·this·unit·with·pin-plug· cables·in·consideration·of·R·and·L.·Now,·setting·the·monitor· switch· on· the· front· panel· or· the· remote· control· to· on· provides·playback.
2. Connection to REC OUT terminal
(recording)
When·the·sound·source·from·the·various·input·devices·is· reproduced,·which·are·connected·to·the·PHONO·or·LINE· terminals·of·this·unit,·setting·the·recording·switch·to·on·allows·users·to·provide·the·REC·OUT·terminal·with·the·signal.·
Connection·between·the·REC·OUT·terminal·of·this·unit·and· the·line·input·terminals·(LINE·IN)·of·the·recorder·with·pinplug·cables·is·required·for·recording·on·the·recorder.·After· the·connection,·you·can·enjoy·listening·to·the·sound·from· the·speaker·system·and·record·the·sound·at·the·same·time.·
These·output·signals·for·recording·are·not·affected·by·the· control·functions·such·as·the·volume·control·and·tone·control·functions.
When you need not toggle an input source to be recorded
(especially when a recorder connected to the recorder output terminals is recording), do not operate this switch.
Do not insert shortpin plugs into REC OUT. No sound is generated.
When a CD recorder, tape recorder, or other devices are connected, be aware that the playback sound volume becomes low or no sound is generated if the device extremely decreases the impedance of the line input terminals of the recorder or causes short-circuit on the line input terminals or if the recording switch is set to on.
How to connect PRE OUT/MAIN IN terminal
Either·the·pre-amplifier·or·main-amplifier·can·be·separately· used.
When·the·pre-amplifier·or·main-amplifier·is·separately·used,· set·the·separate·switch·on·the·front·panel·to·on.·
When·only·the·pre-amplifier·is·used,·connect·the·PRE·OUT· terminal·of·this·unit·to·the·input·terminal·of·another·poweramplifier,·and·when·only·the·main-amplifier·is·used,·connect· the·MAIN·IN·terminal·of·this·unit·to·the·output·terminal·of· another·power-amplifier.
When this amplifier is used without separating between preamplifier and main-amplifier, set the separate switch on the front panel to off, or no sound is generated.
Do not insert shortpin plugs into PRE OUT. No sound is generated.
15
16
Operations
Before operation
1.· Ensure· that· the· connections· are· correctly· performed.·
(Normal· playback· cannot· be· achieved· with· wrong· connection·of·R,·L,·!,·or·@)
2.··When· the· power· is· toggled· between· on· and· off· or· the· input·selector·is·changed·over,·set·the·volume·control·to· the·minimum·position·in·advance.
Playback procedure
1.· Press·the·operation·switch·after·ensuring·that·the·volume· control·is·set·to·the·minimum·position.
2.··Select·a·source·to·be·reproduced·with·the·input·selector.
3.··Adjust·the·sound·level·with·the·volume·control.
4.··Operate·the·line·straight·switch,·balance·control,·and·tone· control·according·to·the·reproduced·source.
How to operate line straight switch
The·line·straight·switch·is·used·to·play·sound·with·the·shortest·signaling·route·for·enhancing·the·purity·of·the·source·selected·with·the·input·selector.·When·this·switch·is·set·to·on,· the· balance· control,· tone· control,· subsonic,· monaural· and· loudness·are·bypassed.
How to operate balance control
The· balance· control· allows· users· to· adjust· the· balance· of· sound·volume·between·right·and·left·channels.·
When· the· balance· adjustment· is· not· required,· the· balance· control·is·set·to·the·center·position.
When the line straight switch is set to on, the balance control does not function.
How to operate the tone control
This·unit·has·the·tone·control·function·for·the·low-frequency· and·high-frequency·ranges.·
The·low-frequency·range·type·works·in·the·300·Hz·or·lower.·
The·tone·control·is·set·to·flat·frequency·characteristic·at·the· center· position.· Rotating· the· control· clockwise· causes· the· low-frequency·range·to·be·enhanced,·and·rotating·the·control·counterclockwise·causes·the·low-frequency·range·to·be· attenuated.·
The·high-frequency·range·type·works·in·the·3·kHz·or·higher.·
As·with·the·low-frequency·range·type,·the·tone·control·is·set· to·flat·frequency·characteristic·at·the·center·position.·Rotating· the·control·clockwise·causes·the·high–frequency·range·to·be· enhanced,·and·rotating·the·control·counterclockwise·causes· the·high-frequency·range·to·be·attenuated.·
For·both·the·low-frequency·and·high-frequency·ranges,·the· right·and·left·channels·interlockingly·function.
When the line straight switch is set to on, the tone control does not function.
How to record a source
1.· Select·a·source·to·be·recorded·with·the·input·selector.
2.· Set·the·recording·switch·to·on.
3.· Play·the·source·to·be·recorded·and·set·the·recorder·to·the· recording·state.
*·· Operation·of·the·tone·control·or·balance·control·does·not· affect·the·recording·signals.·
*·· The·recording·switch·works·when·the·power·is·on.
INTEGRATED AMPLIFIER L-550AX
Procedure of timer-controlled recording
1.· Turn·on·the·operation·switch·to·activate·this·unit.
2.· Select·a·source·to·be·recorded·under·timer·control·with· the·input·selector.
3.· Set·the·recording·switch·to·on.
4.· Perform· time· setting· for· start· and· stop· times· with· your· timer.
5.· Refer·to·the·operating·instructions·of·the·timer·and·other· connected·devices·for·further·information.
If the volume control is not set to low levels, the source selected with the input selector may be reproduced from the speakers. Be sure to set the volume control to a low level.
When timer-controlled recording is performed, operations of the amplifier are the same as regular use.
Procedure of timer-controlled playing
1.· Turn·on·the·operation·switch·to·activate·this·unit.·
2.· Select·a·source·to·be·reproduced·under·timer·control·with· the·input·selector.·
3.· Adjust·the·volume·level·with·the·volume·control.
4.· Perform· time· setting· for· start· and· stop· times· with· your· timer.·
5.· Refer·to·the·operating·instructions·of·the·timer·and·other· connected·devices·for·further·information.
Memory
This·unit·stores·the·following·items·when·the·power·is·off:
Item
INPUT
METER
MONITOR
SUBSONIC
MONO
LOUDNESS
LINE·STRAIGHT
SEPARATE
To·be·stored
Selected·source on/off on/off on/off on/off on/off on/off on/off
Memory reset
The·following·operations·restore·all·the·settings·to·the·factory· defaults.
(1)·Turn·off·the·power·of·this·unit.
(2)·Hold· down· the· operation· switch· on· the· main· unit· for· 5· seconds·or·more·and·press·the·line·straight·switch·on·the· main·unit·once,·and·the·power·state·switches·from·on·to· off.·
That’s·all·for·memory·reset.
·Factory·default
Item
INPUT
METER
MONITOR
SUBSONIC
MONO
LOUDNESS
LINE·STRAIGHT
SEPARATE
Default off off off off
LINE-1 on off off
17
How to Use Remote Control
Remote control (RA-17)
1
2
3
4
6
7
8
9
10
11
5
18
1. Operation switch (OPERATION)
Toggles·the·power·on·and·off.·
When·wiring·or·connection·is·performed,·be·sure·to·turn·off· this·switch.·
2. Input selector
(LINE-1, LINE-2, LINE-3, LINE-4, BAL-1,
BAL-2, PHONO, MONITOR)
Selects·an·input·terminal·from·among·the·unbalanced·input· terminals· on· the· rear· panel· consisting· of· LINE-1,· LINE-2,·
LINE-3,·LINE-4,·PHONO,·and·MONITOR·or·the·balanced· input·terminal·consisting·of·BAL·LINE.·
*··The·balanced·input·terminal·(BAL·LINE)·can·be·selected· by·pressing·either·of·BAL-1·or·BAL-2.
3. Monaural switch (MONO)
Mixes·the·signals·from·right·and·left·channels.·The·monaural· indicator·lights·up·when·this·switch·is·pressed.·
Pressing·this·button·again·to·turn·off·the·monaural·switch· allows·regular·stereophonic·reproduction.·
*··When·the·line·straight·switch·is·set·to·on,·this·switch·does· not·function.·
4. Separate switch (SEPARATE)
Separates·the·pre-amplifier·and·main-amplifier·each·other.· off·:·
(separate·· indicator·off)
·Uses·this·unit·as·a·normal·pre-main·amplifier.· on·:·
(separate·· indicator·on)
·Feeds·external·signals·from·the·MAIN·IN·terminal·on·the·rear·panel·to·the·main-amplifier·section.·
•··Holding·down·this·switch·for·1·second·toggles·the·separate·switch·on·and·off.·
·The·separate·indicator·lights·up·when·the·separate·switch· is·on.·
5. Mute switch (MUTE)
Activates·the·mute·function·and·blinks·the·power-on·indicator·resulting·in·no·sound·generated.·
Pressing· this· button· again· to· set· the· mute· function· to· off· allows·sound·to·be·generated.·
6. Meter switch (METER)
Turns·off·the·meter·lights.
Pressing·this·switch·again·turns·on·the·meter·lights·again.·
INTEGRATED AMPLIFIER L-550AX
7. Subsonic switch (SUBSONIC)
Cuts·ultra-low·frequencies·out·of·audible·range·to·prevent· ultra-low·range·noise·from·adversely·affecting·audible·range.·
This·function·is·significantly·effective·especially·when·a·record· is· warped· or· a· woofer· is· shaking· owing· to· ultra-low· range·vibration.
•··Every·pressing·of·this·switch·toggles·the·subsonic·on·and· off.
The· subsonic· indicator· lights· up· when· the· subsonic· switch·is·on.·
*· ·When·the·line·straight·switch·is·set·to·on,·this·switch·does· not·function.·
8. Loudness switch (LOUDNESS)
Psychoacoustically·compensates·the·frequency·characteristics·when·the·volume·control·is·set·to·the·center·position· or·lower.·
This·compensation·allows·listeners·to·complement·human· listening· characteristics· when· the· sound· volume· is· in· the· low·level.
•··Every·pressing·of·this·switch·toggles·the·loudness·on·and· off.·
The· loudness· indicator· lights· up· when· the· loudness· switch·is·on.·
*· ·When·the·line·straight·switch·is·set·to·on,·this·switch·does· not·function.·
9. Line straight switch (LINE STRAIGHT)
Enhances·the·purity·of·the·sound·quality·by·bypassing·the· balance·control·circuit,·tone·control·circuit,·or·the·like.· off·:·
(line·straight·· indicator·off)
Line·straight·off/bypass·off on·:·
(line·straight·· indicator·on)
Line·straight·on/bypass·on
•··Every·pressing·of·this·switch·toggles·the·line·straight·on· and·off.
The·line·straight·indicator·lights·up·when·the·line·straight· switch·is·on.·
10. CD/SACD player operation switch
(CD/SACD PLAYER)
This·switch·is·used·to·control·the·corresponding·CD/SACD· players.·
As of October 2010, the corresponding CD/SACD players are
D-08, D-06, D-05, D-10, D-7, D-600, and D-700S.
11. Volume (VOLUME, i, o)
This·button·is·used·to·adjust·the·sound·volume.·The·sound· volume·is·lowered·with·o·and·raised·with·i.
Remote control
The·remote·control·shall·be·aimed·at·the·remote·sensor·of· this·unit·within·the·specified·angle·range·shown·in·the·illustration·when·used.
30° 30°
Effective distance: approx. 5 m
Dry cell
[How to load batteries]
1.··Put·your·finger·on·the·battery·cover·claw·on·the·rear·of·the· remote·control,·and·slide·the·cover·downward·to·open·it.·
2.··Put· 2· AAA· batteries· in· the· battery· case· as· shown· in· the· illustration.
3.··Close·the·battery·cover.
*·· When· the· batteries· start· to· lose· power,· the· effective· distance· becomes· shorter· or· the· unit· does· not· function· even·though·the·switch·is·pressed.·In·such·a·case,·both·of· the·batteries·shall·be·replaced·with·new·ones·at·the·same· time.
*·· If· the· remote· control· is· not· used· for· a· long· time,· the· batteries·shall·be·removed·from·the·case.·
19
20
Block Diagram
RECTIFIER RECTIFIER RECTIFIER RECTIFIER RECTIFIER
REG.
REG.
REG.
Specifications
INTEGRATED AMPLIFIER L-550AX
Continuous power output
Total harmonic distortion
Pre-amplifier
Input sensitivity/input impedance
20·W·+·20·W·(8·Ω)
40·W·+·40·W·(4·Ω)
0.007%·(8·Ω,·1·kHz·both·channels·simultaneous·drive,·line·straight·on)
0.02%·(8·Ω,·20·Hz·to·20·kHz·both·channels·simultaneous·drive,·line·straight·on)
PHONO·(MM)·
PHONO·(MC)·
LINE·
MONITOR·
BAL.·LINE·
MAIN-IN·
:·2.5·mV·/·47·kΩ
:·0.3·mV·/·100·Ω
:·180·mV·/·42·kΩ
:·180·mV·/·42·kΩ
:·180·mV·/·79·kΩ
:·450·mV·/·47·kΩ Main-amplifier
Input sensitivity/input impedance
Output voltage
S/N ratio
Frequency response
Tone control
Loudness control
Damping factor
Accessories
Power supply voltage
Power consumption
Max. external dimensions
Weight
REC·OUT·
PRE-OUT·
PHONO·(MM)·
PHONO·(MC)·
LINE·
PHONO·(MM)·
PHONO·(MC)·
LINE·
:·180·mV
:·1·V
:··91·dB·or·more
(IHF-A·weighted,·5·mV·input,·line·straight·on)
:··75·dB·or·more
(IHF-A·weighted,·0.5·mV·input,·line·straight·on)
:··105·dB·or·more
(IHF-A·weighted,·input·shorted,·line·straight·on)
:·20·Hz·to·20,000·Hz·(±0.5·dB,·line·straight·on)
:·20·Hz·to·20,000·Hz·(±0.5·dB,·line·straight·on)
:·20·Hz·to·100,000·Hz·(within·–3·dB,·line·straight·on)
·
·
Max.·amount·of·change· BASS· :·±8·dB·at·100·Hz
· TREBLE· :·±8·dB·at·10·kHz
100·Hz·
10·kHz·
·
·
:·+7·dB
:·+5·dB
:·160
··Remote·control·RA-17·
··Owner’s·Manual·
··size·“AAA”·batteries·(2)·
230·V· ∼·(50·Hz)
··Power·cable
··Safety·cautions
230·W
0.4·W·(at·standby),·170·W·(at·no·input)
440·(W)·×·178·(H)·×·454·(D)·mm
24.3kg·(main·unit·only)
·····*·Specifications·and·appearance·are·subject·to·change·without·notice.
21
Before Asking for Repair Services
22
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.
Cause Solution Problem
No·power·is·supplied·even· though·the·operation·switch·is· pressed.
No·sound·is·generated.
No·sound·is·generated·on·one· side.
···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.
···The· volume· control· is· set· to· the· minimum· level.·
···The·input·selector·is·not·set·to·the·source·to· be·reproduced.·
···Cable·connections·are·incomplete.
···The·output·level·of·the·input·device·is·set·to· the·minimum·position.
···The·separate·switch·is·set·to·on.
···The· mute· switch· of· the· remote· control· is· set·to·on.
···The·balance·control·is·fully·rotated.
curely.
curely.· just·the·sound·volume.
···Set· the· input· selector· to· the· source· to· be· reproduced.
···Make·cable·connections·securely.
···Adjust·the·output·level.
···Set·the·separate·switch·to·off.
···Set·the·mute·switch·to·off.
ter·position·under·normal·conditions.·
···Make·cable·connections·securely.
Humming·sound·(boon·or·zzz· noise)·is·generated.
···The·connecting·cable·is·not·connected·on· one·side·only.
···The·ground·side·of·the·pin-plug·cable·has· no·contact·with·the·terminal.
···The·ground·wire·of·the·record·player·is·not· connected.·
···Make· connections· securely· so· that· the· ground· side· of· the· pin-plug· cable· can· be· connected.
···Connect·the·ground·wire·of·the·record·player·to·the·GND·terminal.
···Connect·(or·mount)·the·cartridge,·shell,·and· tone·arm·securely.
complete· between· the· cartridge· and· shell,· or· between· the· shell· and· tone· arm· of· the· record·player.
···The·line·straight·switch·is·set·to·on.
No·effect·of·tone·control·or·balance·control·is·observed.
The·subsonic,·monaural·or· loudness·is·not·activated.·
The·lights·of·the·power·meters· are·not·turned·on.
The·separate·switch·of·the· remote·control·is·not·activated.·
···The·line·straight·switch·is·set·to·on.
···The·meter·switch·is·set·to·off.
···To·prevent·incorrect·operations,·this·unit·is· designed· to· toggle· the· separate· on/off· by· holding·down·the·separate·switch·approximately·for·approx.·1·second.·
···When·tone·control·or·balance·control·is·used,· the·line·straight·switch·shall·be·set·to·off.·
···When·the·subsonic,·monaural·or·loudness· is·used,·the·line·straight·switch·shall·be·set· to·off.
···Set·the·meter·switch·of·the·remote·control· to·on.
···Hold· down· the· separate· switch· of· the· remote·control·for·approx.·1·second.·
MEMO
INTEGRATED AMPLIFIER L-550AX
23
24
MEMO
LUXMAN CORPORATION, JAPAN
AG00987C82A
Printed in Japan
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