Luxman DA-250 User Manual

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)

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