Luxman DA-250 User Manual

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USB D/A CONVERTER

DA-250

Owner`s Manual

USB D/A CONVERTER DA-250

Contents

Precautions ············································································································· 1

Features of This Unit ································································································ 3

Names and Functions ······························································································ 5

Connections ·········································································································· 15

Operations ············································································································· 18

Block Diagram ······································································································· 20

Specifications ········································································································ 21

Before Asking for Repair Services ·········································································· 23

Precautions

Installation place

• Choose a stable place near the devices that are to be

used in combination with this unit.

• Do not install this unit near a television or color monitor.

Keep this unit away from such devices as cassette decks

that are susceptible to magnetic.

Avoid the following locations for installation.

• Locations exposed to direct sunlight

• Places subject to humidity and with less ventilation

• Places where it is extremely hot or cold

• Places subject to strong vibration

• Places subject to dust

• Places subject to oil, steam, and heat (such as kitchens)

To avoid heat emission

Do not place this unit on such device as an amplifier that

may emit heat. If the unit is installed on a rack, install the unit

as distantly as possible from where the amplifier is installed

so as to avoid heat emission from the amplifier and other

audio devices.

Turn off this unit when it is not used.

Depending on the condition of radio waves emitted during

television broadcasting, interference fringes may appear on

the television monitor, but that is not a malfunction. In such

a case, turn off the unit. There may also be a case where

noises are heard on the radio due to radio wave interfer-

ence.

Notice when handling optical digital cables

• Do not fold the cables. For storage, wind each cable to

make a coil whose diameter is approx.15 cm or larger.

• For connection, insert the cable connectors firmly into the

terminals of this unit and the other device.

• Use the cables whose each length is 3 m or less.

• When the cable connectors get dusty, wipe the dust

away with a dry soft cloth before inserting into the termi-

nals.

Batteries

Caution:

Batteries used for remote controller shall not be exposed to

excessive heat such as sunshine, fire or the like.

Safety caution: Lithium battery

Warning Caution

• Put the lithium battery out of baby's reach.

• In case that the battery is swallowed, consult a doctor im-

mediately.

• Do not disassemble, throw in a fire, recharge, heat, solder,

or short-circuit the battery.

• Do not use or leave the battery in a hot place such as un-

der strong direct sunlight, in a car under the blazing sun,

and in front of a heater. Failure to observe this may cause

battery liquid leakage, heat generation, rupture, or ignition.

This may also degrade the performance or shorten the life

of the battery.

• Danger of explosion if battery is incorrectly replaced.

• Replace only with the same or equivalent type.

• If the battery is not used for a long time (1 month or more),

the battery shall be removed from the case to prevent bat-

tery liquid leakage. If the liquid leaks from the battery, wipe

the liquid off inside the case completely and load a new

lithium battery.

• To discard a used lithium battery, follow the instructions of

each local authority.

USB D/A CONVERTER DA-250

Cleaning

• Usually, wipe the unit with a dry soft cloth. When the dirt

is hard to remove, dip soft cloth in detergent diluted 5 or

6 times with water, wring it well, and remove contami-

nants. Then, remove the moisture with dry cloth.

• Do not use a solvent like alcohol, benzine, thinner, or

pesticide because such a substance can damage the ex-

terior. In addition, do not let this unit contact a rubber or

plastic form for a long time. That may damage the cabi-

net surface of the unit.

• When using a chemical cloth for cleaning, read the cau-

tion provided with the chemical cloth product.

• Before cleaning, unplug the power cord from the AC out-

let.

Precautions in connecting with other components

When connecting this unit to input/output devices other

than a PC/Mac such as a CD player, an SACD player, a

DVD player, a tuner, and a power amplifier, 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 gen-

erated, resulting in an adverse S/N ratio.

Protection circuit

This unit is equipped with a protection circuit that is activat-

ed upon the detection of overcurrent to protect the head-

phones. When the protection circuit is activated, the output

to the headphones is shut off and the operation indicator

blinks to show that this unit is in the muting state. When

the cause to activate the protection circuit is eliminated, the

blue operation indicator light comes back on and the op-

erating state resumes. If the protection circuit is frequently

activated, please consult your dealer.

Insertion and extraction of headphone plug

When the headphone (unbalanced) plug is inserted or ex-

tracted, a short circuit occurs between the L ch output and

R ch output because of the structure of the headphone jack

(unbalanced).

If the volume of this unit is turned up at this moment, an

overcurrent flows to the headphone amplifier output and the

overcurrent detection circuit becomes activated, which sets

this unit to the muting state and may also cause a malfunc-

tion. Therefore, the insertion and extraction of the head-

phone plug shall be performed when the volume is turned

down to the minimum or when there is no signal after shut-

ting off input signals.

Repair and adjustment

When repairs or adjustments are needed, please ask the

dealer where you bought the unit.

Caution in using headphones

If the headphones are used for a long time at a high sound

volume level, your hearing may be damaged.

Features of This Unit

Compact chassis design

This unit is a D/A converter that has a compact body as

small as B4-paper size.

PCM1795 manufactured by Burr-Brown

For the DAC chip, this unit uses PCM1795 manufactured

by Burr-Brown that is used for the LUXMAN SACD player,

D-05u.

USB input supports 192 kHz / 32 bit

B-type USB input terminal is installed and makes it possible

to input USB digital audio signal from a PC/Mac.

The sampling frequency of up to 192 kHz and 32-bit quan-

tization are supported.

USB input supports DSD

DSD format data can be entered from PC/Mac, or the like.

Sampling frequencies of 2.8224 MHz/5.6448 MHz is sup-

ported.

Asynchronous communication supported

The USB input with low jitter has been achieved with USB

dedicated IC by asynchronous communication and PLL.

DD converter function

All the digital inputs including USB can be digitally output in

the S/PDIF format.

AD converter function

Analog line inputs can be converted into digital signals in

the S/PDIF format and output with coaxial or optical termi-

nal. Signals can be output as analog signals by the internal

DAC. (sampling frequency 96 kHz/24-bit)

USB D/A CONVERTER DA-250

LECUA (LUXMAN Electric Controlled Ultimate Attenuator)

An electrically controlled attenuator LECUA, in which at-

tenuation is obtained by combining resistances, is used in

the headphone amplifier unit and analog output unit inde-

pendently to achieve fresh sound.

Built-in headphone amplifier

A high-grade headphone amplifier circuit with discrete cir-

cuit configuration is equipped. The output level can be se-

lected from 2 stages in accordance with the sensitivity of

headphones.

Built-in pre-amplifier circuit

A pre-amplifier circuit equipped with LECUA is embedded

in the analog output.

It is possible to connect the unbalanced or balanced out-

puts to the power amplifier and other directly, so that sound

volume can be controlled.

7-segment LED

The sampling frequency of the digital input and the select-

ed input can be displayed on the monitor with 7-segment

LEDs with a high level of visibility. The attenuation amount

is displayed during sound volume adjustment. The dimmer

function allows the brightness of the LEDs to be selected

from 4 levels.

Original technologies

Our traditional round pattern board, OFC internal wiring, and

original custom-made parts are fully and luxuriously used.

Remote control (RD-24)

Operations can be performed with a compact card-type

remote control.

*1 Mac and Mac OS are trademarks of Apple Inc., registered

in the U.S. and other countries.

*2 Windows is a registered trademark of Microsoft Corpora-

tion in the United States and/or other countries.

*3 DSD is a trademark.

*4 The described company names and product names are

trademarks or registered trademarks of each company.

Names and Functions

1 3 52

86 107 9 1211

Front panel

1. Operation switch (OPERATION)

This switch turns on and off the power.

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.

3. Input selector (INPUT)

Selects an input device connected to each input terminal.

Input transition goes as follows by clockwise rotation:

USB → COAX → OPT 1 → OPT 2 → LINE → USB ...

Input transition goes as follows by counterclockwise rotation:

USB → LINE → OPT 2 → OPT 1 → COAX → USB ...

Input: Digital output from a PC/Mac, a CD player,

an SACD player, a DVD player, and other such

devices (USB/COAX/OPT 1/OPT 2)

Analog line output from a CD player, an SACD

player, a tuner, a DVD player, a TV, and other such

devices (LINE)

4. Input selector display LED

Displays the input terminal selected with the input selector.

The input terminals are shown as follows:

USB input: USb

COAX input: COA

OPT 1 input: OP1

OPT 2 input: OP2

LINE input: LIn

5. Sampling frequency/volume level display LED (SAMPLING RATE/VOLUME)

Displays the sampling frequency of the digital signal con-

nected to the input terminal (USB/COAX/OPT 1/OPT 2)

selected with the input selector. When a digital input is

selected from USB/COAX/OPT 1/OPT 2 with the input se-

lector and the digital input signal from the digital device is

synchronized with this unit, the sampling frequency of the

digital signal is displayed on this LED.

When no digital signal is input or no synchronization is es-

tablished even with a digital signal input, the digital signal

unlock indicator lights up, and the sampling frequency is not

displayed on the LED.

When playback from a PC/Mac is stopped, the sampling

frequency disappears and the unlock indicator stays off.

This phenomenon indicates that communication with the

PC/Mac stays active.

USB D/A CONVERTER DA-250

This LED indicates the current volume level in steps of 1 dB

during sound volume adjustment.

• "- - -" shows the mute state. No sound is generated.

• The minimum volume level is shown as "–87 dB", and the

maximum volume level is shown as "0 dB".

The following sampling frequencies can be displayed.

Input from the USB

terminal

Input from OPT/

COAX terminals

First 3 digits are displayed on the LED.

PCM : 32 kHz, 44.1 kHz, 48 kHz,

88.2kHz, 96 kHz, 176.4 kHz,

192 kHz

DSD : 2.8224 MHz, 5.6448 MHz

: 32 kHz, 44.1 kHz, 48 kHz,

88.2 kHz, 96 kHz, 176.4 kHz,

192 kHz

6. Phase invert indicator (PHASE INVERT)

Lights up when the analog output phase is inverted by

pressing the phase invert changeover switch (PHASE) on

the remote control.

The following shows balanced output phases:

When the [Light is off]

1. GROUND

2. COLD (–)

3. HOT (+)

When the [Light is on]

1. GROUND

2. HOT (+)

3. COLD (–)

Both the unbalanced output and headphone output are in-

verted.

7. Headphone terminal sensitivity indicator (SENSITIVITY HIGH)

Lights up when the headphone terminal sensitivity selection

switch (SENS.) is set to HIGH.

When the [Light is off]

NORMAL: Sensitivity setting 0 dB

When the [Light is on]

HIGH: Sensitivity setting +9 dB

8. Remote control infrared receiver (R)

Receives signals from the accessory remote control.

9. Digital signal unlock indicator (UNLOCK)

Lights up when a digital input is selected from USB/COAX/

OPT 1/OPT 2 with the input selector and the digital input

signal from the digital device is not synchronized with this

unit.

10. Analog output level fix indicator (FIX)

Lights up when the analog output level fix/variable selection

switch (FIX/VARIABLE) on the rear panel is set to FIX.

At this moment, the volume control cannot adjust the ana-

log output level. (The sound volume of the headphones can

be adjusted regardless of the status of the selection switch.)

11. Volume control (VOLUME)

Adjusts the sound volume of the headphones, and the

sound volume of the device connected to the analog un-

balanced output terminals (RCA) or balanced output termi-

nals (XLR) when the analog output level fix/variable selection

switch (FIX/VARIABLE) on the rear panel is set to VARI-

ABLE. 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.

When the analog output level fix/variable selection switch

(FIX/VARIABLE) on the rear panel is set to FIX, the analog

output level is not changed even if the volume control is

rotated.

12. Headphone jack (PHONES)

When listening to the playback sound of this unit with ste-

reo headphones, insert the headphone standard plug in this

output jack.

If the plug of your headphones is mini, use a mini-to-stan-

dard adapter that comes with the headphones or available

on the market.

The phase can be changed with the analog output phase

selection switch (PHASE) on the remote control.

DA-250 FIX/VARIABLE setting table

Output

Setting

FIX Variable Fixed

VARIABLE Variable Variable

Headphone

output

Analog output Digital output

RCA/XLR OPT/COAX

○ (Fixed)

Names and Functions

17 1815 16 19 20 21

14 2213

Rear panel

13. Analog balance output terminals (XLR)

XLR connector terminal to output balanced playback sig-

nals from this unit.

The phase can be changed with the analog output phase

selection switch (PHASE) on the remote control.

The following are the phases of the output terminals of this

unit:

Normal 1. GROUND

2. COLD (–)

3. HOT (+)

Invert 1. GROUND

2. HOT (+)

3. COLD (–)

When the analog output level fix/variable selection switch

(FIX/VARIABLE) is set to VARIABLE, the output level varies

depending on the state of the volume control (VOLUME) on

the front panel.

14. Analog unbalance output terminals (RCA)

RCA terminal to output unbalanced playback signals from

this unit.

The phase can be changed with the analog output phase

selection switch (PHASE) on the remote control.

When the analog output level fix/variable selection switch

(FIX/VARIABLE) is set to VARIABLE, the output level varies

depending on the state of the volume control (VOLUME) on

the front panel.

15. Analog output level fix/variable selection switch (FIX/VARIABLE)

Sets the level of the playback signals from the analog output

terminal to FIX or VARIABLE.

When this switch is set to FIX, the analog output level fix

indicator (FIX) lights up to indicate that the output level from

the analog output terminal (RCA, XLR) is fixed and cannot

be adjusted with the volume control.

When the switch is set to VARIABLE, the output level of the

analog output terminal (RCA, XLR) can be adjusted with the

the volume control on the front panel or the remote control.

The sound volume of the headphones can be adjusted re-

gardless of the status of the selection switch.

When the selection switch is switched, the output level

may change greatly.

Be careful of the sudden change of the sound volume.

USB D/A CONVERTER DA-250

16. USB digital input terminal (USB)

USB (B-type) input terminal used for the digital input signal

from such device as a PC/Mac to be connected with a USB

cable.

The terminal supports the following signals.

• PCM signal

Sampling frequency: 32 kHz, 44.1 kHz, 48 kHz,

88.2 kHz, 96 kHz,

176.4kHz, 192 kHz

Number of quantization bits: 16 bit, 24 bit, 32 bit

• DSD signal

Sampling frequency: 2.8224 MHz, 5.6448 MHz

Number of quantization bits: 1 bit

When the OS is Windows, the dedicated driver software

needs to be downloaded from LUXMAN website and in-

stalled.

Refer to "Driver Installation Manual" on the LUXMAN web-

site for detailed information.

With Mac, this unit is automatically recognized.

Caution:

Connection between a PC and this unit with use of a USB

cable shall not be performed before the installation of this

driver software is completed. Failure to observe this may

cause a malfunction.

17. Analog input terminals (ANALOG IN)

RCA input terminals used for the line level input signals from

a CD player, an SACD player, a tuner, a DVD player, a TV,

and other such devices.

18. Digital input terminal (COAX)

RCA input terminal used for the digital input signals from

such device as a CD player equipped with digital output

terminals using a coaxial digital cable.

The terminal supports the following data.

Sampling frequency: 32 kHz, 44.1 kHz, 48kHz,

88.2 kHz, 96 kHz,

176.4kHz, 192 kHz

Number of quantization bits: 16 bit, 20 bit, 24 bit

19. Digital input terminal (OPT 1/OPT 2)

TOS-LINK input terminal used for the digital input signals

from such device as a CD player equipped with digital out-

put terminals using an optical digital cable.

The terminal supports the following data.

Sampling frequency: 32 kHz, 44.1 kHz, 48kHz,

88.2 kHz, 96 kHz,

176.4kHz, 192 kHz

Number of quantization bits: 16 bit, 20 bit, 24 bit

20. Digital output terminal (COAX)

RCA output terminal used to output digital signals input to

the digital input terminal (USB/COAX/OPT 1/OPT 2) and

digital signals converted from analog input signals.

The input signals selected with the input selector are out-

put. The sampling frequency and the number of quantiza-

tion bits of the digital output signal are the same as those

of the input signals. The frequency for an analog input is

96kHz.

When a DSD file or the PCM data of 32 kHz sampling fre-

quency is played back, a digital audio output cannot be

provided.

21. Digital output terminal (OPT)

TOS-LINK output terminal used to output digital signals in-

put to the digital input terminal (USB/COAX/OPT 1/OPT 2)

and digital signals converted from analog input signals.

The input signals selected with the input selector are out-

put. When a DSD file or the PCM data of 32 kHz sampling

frequency is played back, a digital audio output cannot be

provided.

This terminal is a shutter-type. Direct the cable connector

correctly when inserting the cable into the terminal. If the

cable connector is inserted forcedly to the wrong direction,

the terminal may be deformed, and the shutter may not be

able to close even after cable disconnection.

22. AC inlet (AC IN)

Connects the accessory power cable to supply the power

from the AC outlet on the wall.

Names and Functions

Remote control

1. Digital filter selection switch (PCM)

This switch changes the interpolation function of the 32-bit

digital filter while the PCM data is played back.

Select a filter depending on your taste. The sound quality

can be changed.

There are 2 types of filters, P-1 and P-2

Pressing this switch displays the current setting data (P-1,

P-2) on the display window.

When pressing this switch again while the setting data is

displayed, the next setting data will be displayed.

Pressing the enter switch (ENTER) while the setting data is

displayed determines the setting data.

If the enter switch is not pressed, the digital filter is not

changed.

The impulse response of the interpolation function shows

the waveform shown on this page.

This setting is stored on the flash memory even when the

power is turned off.

P-1 (normal FIR filter)

P-2 (low latency IIR filter)

USB D/A CONVERTER DA-250

Frequency

Gain − dB

Frequency

Gain − dB

2. Analog FIR filter selection switch (DSD)

This switch changes the analog FIR filter while the DSD file

is played back.

Select a filter depending on your taste. The sound quality

can be changed.

There are 2 types of filters, d-1 and d-2.

Pressing this switch displays the current setting data (d-1,

d-2) on the display window.

When pressing this switch again while the setting data is

displayed, the next setting data will be displayed.

Pressing the enter switch (ENTER) while the setting data is

displayed determines the setting data.

If the enter switch is not pressed, the filter is not changed.

The analog FIR filter features the following:

d-1 (normal analog FIR filter)

−3

−6 0 100 200 kHz

d-2 (high attenuation analog FIR filter)

−3

−6

0 100 200 kHz

Depending on the filter selection, there is a difference in sound

volume. When d-1 is selected, the output voltage is 1.2 Vrms.

When d-2 is selected, the output voltage is 1.7 Vrms.

Names and Functions

3. Analog output phase selection switch (PHASE)

The phases of the analog output on the rear panel and the

headphone output are inverted.

The balanced output, unbalanced output, and headphone

output are inverted together.

Pressing this switch displays the current setting data (3-P,

2-P) on the display LED.

When pressing this switch again while the setting data is

displayed, the next setting data will be displayed.

Pressing the enter switch (ENTER) while the setting data is

displayed determines the setting data.

If the enter switch is not pressed, the setting data will not

be changed.

This setting is stored on the flash memory even when the

power is turned off.

[Normal Position]

Indicates that the 3-Pin of the balanced output is positive.

1. GROUND

2. COLD (–)

3. HOT (+)

[Invert Position]

Indicates that the 2-Pin of the balanced output is positive.

1. GROUND

2. HOT (+)

3. COLD (–)

Set as PH, 3-P

3-P

Set as PH, 2-P

2-P

USB D/A CONVERTER DA-250

4. Enter switch (ENTER)

This switch is pressed to execute the set or selected items.

5. Volume control switches (VOLUME)

Adjust the output level of this unit.

Pressing these switches change the output level.

• Pressing ▲ increase the sound volume.

• Pressing ▼ decrease the sound volume.

When FIX is selected, the volume control cannot work be-

cause the analog output level is set to the maximum.

6. Dimmer switch (DIMMER)

Adjusts the brightness of the input selector and sampling

frequency display LEDs. The brightness can be adjusted in

4 stages from normal to light off.

Every time the switch is pressed, the transition goes as fol-

lows: normal (HI) → dim (L01) → very dim (L02) →light off

(OFF) → normal (HI) ....

The setting is determined by pressing the ENTER key (EN-

TER) while the selected brightness is flashing on the display

LED, or after approximately 5 seconds with nothing done.

8. Headphone terminal sensitivity selector (SENS.)

Selects between HIGH and NORMAL in accordance to the

efficiency of the headphones to be used.

If the efficiency of the headphones is low and the sound

volume is not sufficient even if the volume control is rotated

to turn up the sound volume, select HIGH.

If the efficiency of the headphones is high and controlling

the sound volume is difficult, select NORMAL.

The sensitivity of this unit is set to the following:

HIGH: +9 dB

NORMAL: 0 dB

When this selector is set to HIGH, the headphone termi-

nal sensitivity indicator, SENSITIVITY HIGH, of the main unit

lights up.

7. Input selector (USB, COAX, OPT 1, OPT 2, LINE)

Selects an input terminal on the rear panel.

During input selecting operation, muting circuit is in opera-

tion and the unit will be on mute.

The display LEDs of the main unit are shown as follows:

USB: USb

COAX: COA

OPT 1: OP1

OPT 2: OP2

LINE: LIn

Names and Functions

Effective distance: approx. 5 meters

Remote control

The remote control shall be aimed at the remote control

infrared receiver (R) of this unit within the specified angle

range shown in the illustration below when used.

30°30°

Battery

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 a coin-type lithium battery (CR2025) in the battery case

as shown in the illustration.

⊕ side

3. Close the battery cover.

* When the batteries start to lose power, the effective dis-

tance becomes shorter or the unit does not function even

though the switch is pressed. In such a case, replace the

existing battery with new one.

* If the remote control is not used for a long time (1 month or

more), the battery shall be removed from the case.

Warning

About lithium battery

• Put the lithium battery out of baby's reach.

• In case that the battery is swallowed, consult a doctor

immediately.

• Do not disassemble, throw in a fire, recharge, heat,

solder, or short-circuit the battery.

• Do not use or leave the battery in a hot place such as

under strong direct sunlight, in a car under the blazing

sun, and in front of a heater. Failure to observe this

may cause battery liquid leakage, heat generation,

rupture, or ignition. This may also degrade the perfor-

mance or shorten the life of the battery.

Caution

• Danger of explosion if battery is incorrectly re-

placed.

• Replace only with the same or equivalent type.

• If the battery is not used for a long time (1 month or

more), the battery shall be removed from the case to

prevent battery liquid leakage. If the liquid leaks from

the battery, wipe the liquid off inside the case com-

pletely and load a new lithium battery.

• To discard a used lithium battery, follow the instruc-

tions of each local authority.

USB D/A CONVERTER DA-250

Connections

POWER AMP

INTEGRATED AMP D/A CONVERTER

TUNER

L R

(F) (E) (G)

(To the headphone jack on the front panel of this unit)

HEADPHONE

CD PLAYER

(with digital input terminals)

(G)

PC／Mac

(A)

(D)

(B)

CD/SACD PLAYER DVD PLAYER

(C)

Before Connecting

Before connecting other devices, connect the jack side of

the accessory power cable to the AC inlet of this unit.

When connecting, turn off the power supply of this unit and

the power supplies of auxiliary devices to prevent unex-

pected accidents that may be caused by noise.

How to connect power supply

Use the accessory power cable to insert the AC plug in an

outlet on the wall in the listening room.

USB D/A CONVERTER DA-250

Connections

How to connect input devices

1. Digital connection from a PC/Mac (Refer to "A" in the connection diagram)

Connect between the USB (A-type) terminal of the PC/Mac

and the USB (B-type) terminal of this unit with a USB cable.

When the OS is Windows, the dedicated driver software

needs to be downloaded from LUXMAN website and in-

stalled.

Refer to "Driver Installation Manual" on the LUXMAN web-

site for detailed information.

With Mac, this unit is automatically recognized.

Caution:

Connection between a PC and this unit with use of a USB cable shall not be performed before the installation of this driver software is completed. Failure to observe this may cause a malfunction.

2. Digital connection from such device as a CD player (Refer to "B" and "C" in the connection diagram)

Connect between the (coaxial or optical) digital output ter-

minal of a CD player, an SACD player, a DVD player, and

other such devices and the digital input terminal (COAX/

OPT 1/OPT2) of this unit with a coaxial digital cable or an

optical digital cable.

This terminal is a shutter-type. Direct the cable connector

correctly when inserting the cable into the terminal. If the

cable connector is inserted forcedly to the wrong direction,

the terminal may be deformed, and the shutter may not be

able to close even after cable disconnection.

Upper side

The optical terminals are directed as illustrated.

Lower side

How to connect output devices

1. Unbalanced connection with such device as an integrated amplifier

(Refer to "E" in the connection diagram.)

Connect between the analog unbalanced output terminals

(RCA) of this unit and the unbalanced input terminals of

such device as an integrated amplifier with 2 RCA pin-plug

cables.

At this connection, the sound volume of the output signal

change in accordance with the state of the line output level

fix/variable selection switch (FIX/VARIABLE).

FIX/VARIABLE

selection switch

FIX lit up Always fixed

VARIABLE off

indicator

Sound volume

FIX

of the output signal

Interlocked with the volume control

2. Balanced connection with such device as an integrated amplifier

(Refer to "F" in the connection diagram.)

Connect between the analog balanced output terminals

(XLR) of this unit and the balanced input terminals of such

device as an integrated amplifier with 2 XLR balanced ca-

bles.

At this connection, the sound volume of the output signal

change in accordance with the state of the line output level

fix/variable selection switch (FIX/VARIABLE).

FIX/VARIABLE

selection switch

FIX lit up Always fixed

VARIABLE off

indicator

Sound volume

FIX

of the output signal

Interlocked with the volume control

Devices to be connected i.e. amplifier

Integrated amplifier

Power-amplifier/ active speakers

Devices to be connected i.e. amplifier

Integrated amplifier

Power-amplifier/ active speakers

3. Analog connection from such device as a CD player

(Refer to "D" in the connection diagram.)

Connect between the analog output terminals of a CD play-

er, an SACD player, a DVD player, a tuner, a TV audio sys-

tem, and other such devices and the analog input terminals

(ANALOG IN) of this unit with 2 RCA pin-plug cables.

3. Digital output to such device as another D/A converter

(Refer to "G" in the connection diagram.)

Connect between digital output terminal (COAX/OPT) of this

unit and such devices as a D/A converter and a CD player

equipped with digital input terminals with a coaxial digital

cable and an optical digital cable.

Operations

USB D/A CONVERTER DA-250

This unit is a D/A converter. Any operations for sound play-

back are performed by such input device as a PC/Mac or CD

player connected to the input terminals.

Before operation

1. Ensure that the connections are correctly performed. (Nor-

mal playback cannot be achieved with wrong connections

of R and L.)

2. After ensuring that the volume control has been rotated

counterclockwise to the end and the sound volume is at

the minimum level, press the operation switch to turn on

the power of this unit.

Sound playback of a device connected to a digital input terminal (analog output)

1. Select an input device to be played back with the input

selector. (USB/COAX/OPT 1/OPT 2)

2. When the input devices start playback, the digital signal

unlock indicator (UNLOCK) turns off, and the sampling fre-

quency of the playback signal is displayed on the LED.

If the digital signals input to the unit are abnormal, the dig-

ital signal unlock indicator (UNLOCK) lights up, and signals

will not be output.

3. If such a device as an integrated amplifier is connected to

the analog unbalanced output terminals (RCA) or if such a

device as an integrated amplifier is connected to the an-

alog balanced output terminals (XLR) under the condition

that the analog output level fix/variable selection switch

(FIX/VARIABLE) on the rear panel is set to FIX , adjust the

sound volume with the volume control of the output de-

vice.

If such a device as an integrated amplifier and amplifi-

er-built-in speakers is connected to the analog unbal-

anced output terminals (RCA) or if such a device as a pow-

er amplifier is connected to the analog balanced output

terminals (XLR) under the condition that the analog output

level fix/variable selection switch (FIX/VARIABLE) is set to

VARIABLE, adjust the sound volume with the volume con-

trol of this unit.

Sound playback of a device connected to an analog input terminal (analog output)

1. Select an input device to be played back with the input

selector. (LINE)

2. If such a device as an integrated amplifier is connected to

the analog unbalanced output terminals (RCA) or if such a

device as an integrated amplifier is connected to the an-

alog balanced output terminals (XLR) under the condition

that the analog output level fix/variable selection switch

(FIX/VARIABLE) on the rear panel is set to FIX, adjust the

sound volume with the volume control of the output de-

vice.

If such a device as a power amplifier and amplifier-built-in

speakers is connected to the analog unbalanced output

terminals (RCA) or if such a device as a power amplifier is

connected to the analog balanced output terminals (XLR)

under the condition that the line output level fix/variable

selection switch (FIX/VARIABLE) is set to VARIABLE, ad-

just the sound volume with the volume control of this unit.

FIX/VARIABLE

selection switch

FIX lit up Always fixed

VARIABLE off

indicator

Sound volume

FIX

of the output signal

Interlocked with the volume control

Devices to be connected i.e. amplifier

Integrated amplifier

Power-amplifier/ active speakers

How to use the digital output

The playback signals input to this unit can be output from a

digital output terminal to such devices as another D/A con-

verter and a CD player equipped with digital input terminals.

A CD player equipped with no USB input terminals can re-

ceive digital signal that is input from the USB input terminal of

this unit by connecting between a digital input terminal (OPT/

COAX) of the player and a digital output terminal (OPT/COAX)

of the unit.

1. Select an input device to be played back with the input

selector. (USB/COAX/OPT 1/OPT 2/LINE)

2. Adjust the sound volume with the volume control of the

connected system device.

Operations

How to use the headphone output

Insert the standard plug of headphones into the headphone

jack (PHONES) on the front panel of this unit after the volume

control is rotated counterclockwise to the end.

Start the playback of the input device, and rotate the volume

control slowly clockwise to your favorite sound volume.

Whenever the power is turned on and off, the input selec-

tor is changed over, or the headphone plug is connected or

disconnected, be sure to rotate the volume control counter-

clockwise to the end to set the sound volume to the mini-

mum.

If the headphones are used for a long time at a high sound

volume level, your hearing may be damaged.

Applied use of the analog output terminals

If the analog output level fix/variable selection switch (FIX/

VARIABLE) is set to VARIABLE and the analog unbalanced

output terminals (RCA) of this unit are connected to the

main in terminal (MAIN IN) of an integrated amplifier (such

as LUXMAN L-505uX) that is equipped with the separate

function, the pre-amplifier section can be used as a newly-

designed pre-amplifier circuit.

Block Diagram

Digital out

Digital in

Analog in

USB D/A CONVERTER DA-250

Analog out

Unbal. L

Buffer

Unbal. R

Buffer

LECUA

–

L.P.F.

I-V

Amp

–

LECUA

–

I-V

Amp

–

Buffer

L.P.F.

Bal. R

Buffer

–

L.P.F.

I-V

Amp

–

LECUA

REG. ±15V REG. ±15V REG. ±15V

Tr-

H/P

Driver

+Amp

Phones

Tr-

H/P

Driver

+Amp

REG. ±15V

Power Regulator

for Digital Circuit

Line

Filter

FUSE

POWER SW

Power

Transformer

for Audio Circuit

Power Regulator

for Acc. Circuit

Power Regulator

Bal. L

3p: HOT (+)

2p: COLD (-)

1p: GROUND

Buffer

–

L.P.F.

I-V

Amp

–

DAC

PCM1795

CPU

System Control

Clock

LINE

Sel.

COAX

Data

32kHz～192kHz

PCM9211

DIR / DIT

OPT-1

OPT-2

noise

Generator

low phase-

Data

USB

Controller

Sel.

LPC1822

32kHz～192kHz

USB

2.8224/5.6648MHZ

OPT

COAX

Key

Volime Display

Specifications

Format 2-channel, USB D/A converter

Ambient operating

temperature

Audio output

characteristics

Digital input Coaxial digital input 0.2 to 2.5 Vp-p

Line input Input sensitivity/input

Digital output Coaxial digital output: RCA terminal 0.5 Vp-p/75 Ω

Output voltage/output

impedance:

Frequency response: 4 Hz to 20 kHz (+0, –0.5 dB)

Total harmonic distortion: 0.001 %

S/N ratio: 118 dB

Dynamic range: 118 dB

Channel separation: 107 dB

Optical digital input: –14.5 to –24 dBm

USB input:

(Applicable OS)

Sampling frequency: OPT/COAX input: 32 kHz, 44.1 kHz, 48 kHz,

impedance:

Max. input: 2.5 Vrms

Optical digital output: Optical digital terminal –15 to –21 dBm

+5 °C to +35 °C

UNBALANCE terminal (RCA terminal) 2.5 Vrms/300 Ω

BALANCE terminal (XLR terminal) 2.5 Vrms/600 Ω

For DSD (Refer to page 10) 1.2 Vrms (d-1)

1.7 Vrms (d-2)

PHONE terminal (Standard plug) 130 mW + 130 mW (600Ω)

400 mW + 400 mW (32Ω)

200 mW + 200 mW (16Ω)

2 Hz to 50 kHz (+0, –3.0 dB)

Microsoft Windows Vista or later, Mac OS X10.7 or later

USB input: PCM: 32 kHz, 44.1 kHz, 48 kHz,

DSD: 2.8224 MHz, 5.6448 MHz

2.5 Vrms / 6.7 kΩ

88.2 kHz, 96 kHz, 176.4 kHz,

192 kHz

(16 bit, 20 bit, 24 bit)

88.2 kHz, 96 kHz, 176.4 kHz,

192 kHz

(16 bit, 24 bit, 32 bit)

(1 bit)

USB D/A CONVERTER DA-250

Attached functions Front panel • Power switch

• Input LED

• PHASE INVERT indicator

• FIX indicator

• Sound volume

Rear panel • AC inlet

• Digital output terminal

(COAX, OPT)

• FIX/VARIABLE selection switch

Accessories • Remote control RD-24

• Owner's Manual

(This document)

• Input selector

• Sampling frequency LED

• SENSITIVITY HIGH indicator

• UNLOCK indicator

• Headphone output terminal

• Digital input terminals

(USB, COAX, OPT 1/OPT 2)

• Analog output terminals

(BALANCE, UNBALANCE)

• Coin-type lithium battery,

CR2025

• Power cable

• Safety cautions

Power supply 230 V ~ (50 Hz)

Power consumption 20 W

Weight (Main unit) 5.4 kg

Dimensions 364 (W) x 81 (H) x 279 (Knobs (14 mm) and terminals (8mm)

included) (D) mm

* Specifications and appearance are subject to change without prior notice.

Before Asking for Repair Services

While the unit is used, an unusual phenomenon may be confused as a malfunction for a certain reason. Prior to asking our official sole

distributor of your country for repair services, please check the table below and read the operating instructions for the subsidiary devic-

es. If the cause of the malfunction cannot be identified, please make queries to the purchasing store. When we have once accepted

your request for repair services, inspection fees and traveling expenses may be claimed even though the unit is found to be normal.

Besides, a personal computer such as a PC/Mac connected to the unit and the software that operates on the PC/Mac (operations and

settings included) are not supported.

Problem Cause/Solution Ref. page

No power is supplied even though the operation switch is pressed.

No sound is generated. / Sound volume is too low.

No sound is generated. / Sound volume is too low. (Digital input)

• Connect the power cable to the AC inlet (AC IN) and the AC outlet ﬁrmly.

• Connect the input devices, ampliﬁer, speakers, and headphones correctly.

• Set the input selector to the source to be played back. 18

• When you are listening to the sound of headphones or the variable analog output, adjust the sound volume with the volume control of the main unit.

• When you are listening to a sound with the ﬁxed analog output, adjust the sound volume with the volume control of the connected ampliﬁer.

• Connect digital cables correctly. 15 - 17

• If the USB is selected as an input source, select this unit (DA-250) as the output destination by conﬁguring the sound setting of a PC/ Mac.

• If the unit (DA-250) cannot be selected even when trying the solution above, reconnect the USB cable.

• If the USB is selected as an input source, adjust the sound volume by conﬁguring the sound setting of a PC/Mac.

Refer to the instruction manual of the PC/Mac or the software in use.

15 - 17

18 - 19

The remote control cannot be operated.

• If the USB is selected as an input source, adjust the sound volume on a player software of a PC/Mac.

• Ensure that this unit supports the sampling frequency and the number of quantization bits of the played back digital signals.

• Ensure that the digital signal unlock indicator (UNLOCK) is not lit up. (When the digital signal from the digital device is not synchronized with this unit, the source may not be played back.)

• Operate the remote control within the speciﬁed operating range. 13

• Replace the remote control battery with a new one. 13

• The remote control infrared receiver is exposed to direct sunlight or strong light sources (such as inverter ﬂuorescent lights). Change the installation place or angle to avoid the exposure to light sources.

USB D/A CONVERTER DA-250

Problem Cause/Solution Ref. page

An electronic device such as a television malfunctions.

Hum noises (boon or zzz noise) are generated.

• Some devices equipped with a wireless remote control receiver may malfunction when the remote control of this unit is operated. Keep this unit away from such devices.

• Insert the RCA pin-plugs of the line cables ﬁrmly. 16

• Induction noise may be picked up from the power transformer of another device. Install this unit distantly from the other device.

• When you are listening to the sound of headphones, arrange the headphone cable and the power cable so that they are not laid too close.

This unit may not work normally when the unit is subject to external influence such as static electricity. In such a case,

the unit can work normally by unplugging the power cable once and plugging it again. If the problem is not solved, please

contact your dealer or our service center.

LUXMAN CORPORATION, JAPAN

AG00987E47A Printed in Japan

Luxman DA-250 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual