Alpha Design Labs GT40 User manual

取扱説明書
User manual
24Bit 96KHz Audio Interface
Source Selection Switch
USB 2.0
GT40
Level
min max
GT40 USB DAC by FURUTECH
Alpha Design LAbs
ADL GT40 USB DAC
by FURUTECH

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Alpha Design LAbs
WHEN USING YOUR GT40 USB DAC PRECAUTIONS SHOULD ALWAYS BE
FOLLOWED, INCLUDING THE FOLLOWING:
WARNING Misuse of electrical equipment displaying this mark may cause serious injury
CAUTION Misuse of electrical equipment displaying this mark may be deadly
1. Read all instructions.
2. Operate GT40 for its intended purpose only.
3. To reduce the risks of electric shock do not immerse the unit in water or other liquids.
4. Never pull power cord to disconnect unit from wall outlet. Instead grasp AC adaptor and pull to
disconnect.
5. Do not allow power cord to touch hot surfaces.
6. Do not operate unit with a damaged power cord or if the unit has been dropped or damaged.
To reduce the risk of electric shock do not disassemble or attempt to repair the GT40; take it to
a qualied service technician for examination and repair. Incorrect reassembly or repair could
cause a risk of re, electric shock, or injury when the GT40 is used.
SAVE THESE INSTRUCTIONS
Modications
CAUTION: DO NOT SUBSTITUTE PARTS OR MAKEANY MODIFICATIONS WITHOUT THE WRIT-
TEN APPROVAL OF FURUTECH CO., LTD. MODIFICATION MAY CREATE SAFETY HAZARDS AND
VOID THE WARRANTY.
NOTICE: CHANGES OR MODIFICATIONS NOT EXPRESSLY APPROVED BY FURUTECH CO., LTD.
COULD VOID THE USER’SAUTHORITY TO OPERATE THE EQUIPMENT UNDER FCC REGULA-
TIONS.
Repairs
CAUTION: DO NOT SERVICE OR REPAIR THIS PRODUCT UNLESS PROPERLY QUALIFIED.
ONLY A QUALIFIED TECHNICIAN SHOULD PERFORM REPAIRS.
IMPORTANT SAFETY INSTRUCTIONS

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ADL GT40 USB DAC
Alpha Design Labs 24bit/96kHz GT40 USB DAC with Phono Stage
The GT40 Harmonizes Computer Files and Analog Inputs
The GT40 is nally here, built for enthusiasts with growing music collections on their computer
hard drives. It’s a high performance 24bit/96kHz USB DAC that’s amazingly affordable. Looking
to convert your LPs or other analog sources to digital? The GT40 will take you to the podium with
every album you archive.
The seriously-shielded audiophile-grade GT40 features a low-latency USB 2.0 audio driver that
plays and records at 96kHz. A likely rst for this category, the GT40 includes a built-in low-noise
MM / MC phono preamp! Record your favorite vinyl to hard disk via the USB output.
The ADL GT40 features L/R analog outputs, and switchable line or phono inputs with a vivid,
captivating sound that is simply unheard of in this category.
The ADL GT40 (wired with Furutech’s GT2 or ADL’s Formula 2 USB cable of course) brings
Furutech’s signature sound -- smooth, detailed clarity -- to desktop systems, especially with high
resolution 24bit/96kHz les, but even 16bit/44.1kHz les sound impeccable and very musical.
Features
• High performance 24bit/96kHz USB DAC and ADC IC chip
• Enjoy audio in high resolution at 24bit/96kHz surpassing conventional 16bit/44.1kHz
standards
• Incorporates the most trusted driver in professional audio for 96kHz recording and playback
• External power supply: while a USB-powered device might be convenient, it won’t develop
the power required for high resolution playback, so we designed the GT40 with an external
power supply to solve the problem.
• Headphone Amplier: The GT40 contains a high performance headphone amplier with
ample drive for good headphones.
• Analog-to-Digital Converter: The GT40 sports a high-performance ADC IC chip for high
resolution recordings via analog inputs including phono, AM/FM radio, or other analog
signals.
• Phono Preamplier: A rst for this class, the GT40 features a phono equalizer for recording
your precious LPs. Switch between Moving Magnet (MM) and Moving Coil (MC) or Line
input
• Highest Quality Parts: The GT40 features a high quality amplier and capacitors supporting
its high performance analog circuit.
• High End Audio Grade Connection: The GT40 is equipped with gold-plated Teon-insulated
RCA jacks with an extremely high quality aluminum chassis and machined volume knob

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Important Note:
The GT40 has been designed as a USB DAC primarily for the playback of PC based digital audio
and for the conversion and recording of analog signal via USB to your PC.
Included with the GT40:
• User manual
• AC Adaptor for use with GT40 only
• USB cable x 1
Please read carefully and follow all instructions.
Keep this manual for future reference.
Functions and Part names ・・・・・・・・・・・・
Front Panel
Rear Panel
ADL GT-40 Connectivity ・・・・・・・・・・・・・・
Connection and settings
PC requirements
Basic settings
Windows XP・・・・・・・
Windows 7 ・・・・・・・・
MAC OS ・・・・・・・・
Specications ・・・・・・・・・・・・・・・・・・・・・・・
Warranty・・・・・・・・・・・・・・・・・・・・・・・・・・・・
User manual contents
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ADL GT40 USB DAC
① Power Switch
② Phono/Line USB switch: for switching between USB input or Phono/Line input
③ Headphone Jack
④Volume Control （1.Playback volume control. 2.Headphone volume control）
⑤ Phono (MM/MC) and Line Switch: Switches between analog inputs, line or phono moving magnet
cartridge and phono moving coil cartridge.
CAUTION: Do not switch between settings during playback or while the GT40 is
switched on. Doing so may damage speakers.
⑥ USB Connector: Hook to USB connector on your computer.
※The Phono/Line or USB selector switch on the front panel must be set to USB for the GT40
to receive signal from the computer.
⑦ Phono/Line Level L/R RCA Analog Inputs: Connect to external analog sources
⑧ Phono/Line Level L/R RCA Analog Outputs: Connect to L/R ampli󳞛er inputs
⑨ Earth/Ground Terminal: Connect Phono cable ground wire to reduce noise
⑩ AC Input: Connect GT40 AC Adaptor / Rating: AC 9V 0.5A
■ Front Panel
■ Rear Panel
Functions and Part names
1
43
2
9 8
610
57

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ADL GT-40 Connectivity
Playback of digital les stored on a PC via Line Out
PC > USB cable > GT-40 > Analog Line Out > Preamp
Notes: USB button on the front panel must be in the USB setting.
Recording from an LP to PC hard drive
Turntable > Phono Cable > GT-40 Analog MM/MC Line In > USB Cable > PC
Note: USB button on the front panel must be in the Phono/Line setting and the MM/MC/Line switch on the rear
panel must be switched to the appropriate cartridge setting, either Moving Coil or Moving Magnet. Caution: Do not
switch between settings on the MM/MC/Line switch while the GT40 power is powered on. This may damage
speakers.
Note: During Recording
To monitor while recording the GT40 must be connected to the preamp via the Analog Line Outputs.
Recording from an Analog Source other than a Turntable to PC hard drive
Analog Source > Line Cable > GT40 Analog Line or Phono MM/MC In > USB Cable > PC
Note: USB button on the front panel must be in the Phono/Line setting and the MM/MC/Line switch on the rear
panel must be switched to Line. Caution: Do not switch between settings on the MM/MC/Line switch while the
GT40 power is powered on. This may damage speakers.
Note: During Recording
To monitor while recording the GT40 must be connected to the preamp via the Analog Line Outputs.

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ADL GT40 USB DAC
Windows XP
Computer settings
A few simple steps are required to record from the Line Level Inputs
Computer Requirements
Hardware: One USB 2.0 port
Operating System: Windows XP or higher, Mac OS10 or higher
Connections
Connect the GT40 to the computer with a USB cable and power on the GT40. The computer will automatically
recognize and install the GT40.
System Settings for Recording at 16bit/44.1kHz
In Control Panel choose Sounds and Audio Devices. The GT40 USB DAC should be selected as the Default
Sound Device. Below are screenshots of the various settings.
Volume Tab
Ensure Volume is set to high
Choose the Advanced button to choose stereo, mono or surround
mode
Audio Tab
Ensure ADL GT40 USB DAC is the Default Sound Playback Device
Ensure ADL GT40 USB DAC is selected as the Default Sound
Recording Device
Basic Settings

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Alpha Design LAbs
Voice Tab
Ensure ADL GT40 USB DAC is selected as the Default Playback
Device
Right click on the Volume icon on the Task Bar and under Options
select Properties
Select ADL GT40 as the mixer device and check both Recording
and Line Delete

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ADL GT40 USB DAC
Windows 7
Computer settings
A few simple steps are required to record from the Line Level Inputs
Computer Requirements
Hardware: One USB 2.0 port
Operating System: Windows XP or higher, Mac OS10 or higher
Connections
Connect the GT40 to the computer with a USB cable and power on the GT40. The computer will automatically
recognize and install the GT40.
System Settings for Recording at 16bit/44.1kHz
In Control Panel choose Sounds and Audio Devices. Below are screenshots of the various settings.
Playback Tab
Ensure the ADL GT40 is enabled
Recording Tab
Ensure the GT40’s Line Level Inputs are se-
lected as the Default Recording Device
Double-Click the Line Input for
Line Properties
Levels Tab
Ensure Levels are set to 100%

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Recording Quality
System Settings for Recording at 16bit/44.1kHz
Double-Click the Line Input for Line Properties
Levels Tab
Ensure Levels are set to 100%
Advanced Tab
Ensure the sample rate and bit depth is set to either
2 channel, 16bit/44.1kHz
Recording Quality
System Settings for Recording at 24bit/96kHz
Double-Click the Line Input for Line Properties
Levels Tab
Ensure Levels are set to 100%
Advanced Tab
Ensure the sample rate and bit depth is set to 2 channel,
24bit/96kHz

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ADL GT40 USB DAC
MAC OS
Computer settings
A few simple steps are required to record from the Line Level Inputs
Computer Requirements
Hardware: One USB 2.0 port
Operating System: Windows XP or higher, Mac OS10 or higher
Connections
Connect the GT40 to the computer with a USB cable and power on the GT40. The computer will automatically
recognize and install the GT40.
Note:Do not set the bit and sample rates on the MAC OS MIDI application to 24bit/96kHz. Only set bit and
sample rates to 24bit/96kHz on recording software
Sound Output
Ensure the ADL GT40 is enabled and set Output
volume to maximum
Sound Input
Ensure the ADL GT40 is enabled and set
Input volume to maximum

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Alpha Design LAbs
■ USB DAC & analog playback and record multimedia device
■ Connectivity: USB B-type connector, analog input/outputs on RCAs
■ USB Playback Resolution : 24bit/96kHz
■ USB Recording Resolution:
96kHz (Max) supports 32kHz/44.1kHz/48kHz
■ Frequency response: 20Hz ~ 20kHz (40Hz: +0.5 dB, 15kHz:-0.5dB)
■ SN ratio:-90dB (A-wtd) / Line Output
■ Line Output Level: 1 Vrms
■ Line Input Level: MC 0.4mV / MM 5mV / Line 1V
■ Headphone Output Level:
160mW (16ohm)Max , 80mW (32ohm)Max , 10mW (300ohm)Max
■ Input Impedance: 47k ohm (MC/MM) , 47k ohm (Line)
■ Power Supply AC Adaptor Rating: AC 9V 0.5A
■ Dimensions: 150 (W) x 111 (D) x 57 (H) mm
■ Weight: 785g Approx.
Specifications
Furutech reserves the right to change product specications without prior notice

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ADL GT40 USB DAC
LIMITED WARRANTY
MODEL No. GT40 USB DAC
This product is made of high quality materials and great care has been taken in its manufacture. It is
designed to give good performance provided it is properly operated and maintained. This product is sold
subject to the understanding that if any defect in manufacture or material shall appear within 12 months
from date of consumer sale, Furutech will arrange for such defect to be rectied without charge provided
that: The defect is not due to use of the product for other than domestic purposes, or on an incorrect
voltage, or contrary to operating instructions, or to accidental damage (whether in transit or otherwise),
misuse, neglect or inexpert repair, or incorrect installation.
This guarantee card does not cover accessories belonging to the product.
No alteration of this guarantee card will be allowed.
For service enquires please call your local dealer or distributor.
Important notice: for free repair service please keep this guarantee card and the invoice in a safe place.
Please ll out and return to Furutech’s local dealer
Model No ADL GT40 USB DAC
Customer’s Name
Address
Tel No.
Date of purchase
Store where
purchased
E-mail Address
FURUTECH Co., Ltd.TOKYO , JAPAN
7-11-1 Nishi-Gotanda, Shinagawa-ku Tokyo 141-0031 Japan
TEL.[phone] FAX.[phone]
www.adl-av.com
e-mail:[e-mail]

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Alpha Design LAbs
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保証書 保証期間: 1 年間
品番 ADL GT40 USB DAC
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ご注意：販売店印ならびに購入日の記入がない場合は、無効となります 。
販売店印
フルテック株式会社
〒 -
FURUTECH Co., Ltd.TOKYO , JAPAN
製造元：フルテック株式会社
〒141-0031東京都品川区西五反田7-11-1
TEL.[phone] FAX.[phone]
www.adl-av.com
e-mail:[e-mail]

Alpha Design LAbs
by FURUTECH