ADL

A1-1. Not connected correctly
(Refer to manual and check if the GT40α is connected correctly to the computer via USB cable.)

A1-2. There is a problem with a USB Hub
(ADL does not recommend the use of a Hub when connecting the GT40α to a computer)

A1-3. Computer does not recognize the GT40α as both the playback and recording USB device
(If your computer has Windows OS please download the GT40α driver from the GT40α webpage and install)
(Disconnect the USB cable and reconnect after 10 seconds. If it still does not recognize the GT40α restart the computer.)

A2. Switching between settings during playback
(There is a small possibility of an OS system error when switching between settings on the GT40α during playback. Avoid switching during playback.)

A3-1. The sound has been muted
(Open the volume control tab on the computer and unselect mute.)

A3-2. Volume output setting is too low
(Open the volume control tab on the computer and set the volume to maximum.)

A3-3. Another device is set as the default playback device
（Open the Sound and Audio Device properties tab and select USB Audio Device “Furutech ADL GT40α “ as default playback device.）

A3-4. There is a problem with the external amp or speakers
(Check the connection between external components and the GT40α LINE OUT RCA jacks.)

A3-5. Headphones are plugged into the 6.3mm phone jack on the front panel of the GT40α
（When headphones are plugged in, there will be no signal output form the Line Out jacks.）

A3-6. In the case of Windows OS make sure the ADL ASIO driver is installed and “Furutech ADL GT40α “is selected and “Apply” is clicked in the desktop ADL ASIO tool. In the settings the ASIO buffer size should be set to 5 milliseconds

A4. USB device is set as the default for playback
(When the GT40α is selected as default audio device for playback, there will be no sound from the computer speakers)

A5-1. The volume is set too low on the GT40α
（Adjust the volume on the front of the GT40α to the appropriate level）
(When adjusting volume level for headphones the Line Out RCA jack’s volume level is also adjusted)

A5-2. The GT40α power is not switched on
（Push the power button on the GT40α front panel. It will show as blue when switched on）

A6-1. Balance is not set a neutral
(Open the volume control tab on the computer and set the balance to neutral - centered.)

A6-2. There is a balance problem with the external amp or speakers
(Check the balance settings on external components.)

A7. CD-ROM drive does not have digital output
(If the system does not stream digital output from the CD-ROM drive、then there will not be sound output via USB. CD-ROM drives and CD transports must be connected to the LINE IN RCA jacks for listening with headphones)

A8-1. Check that the connections are correct
(Check the connection between external components and the Phono/Line Input. If there are no problems with the external components, then check the cable connection.)

A8-2. There is no sound output from external components
(Check if there is sound output from external components.)

A8-3. The selector switch on the front of the GT40α lights up green
（If the selector switch is green, the computer is set as the sound source via USB. If the switch is red, ANALOG (Phono/Line) has been selected）

A8-4. Incorrect setting of the rear panel Input Selector Switch “ LINE / PHONO（MC or MM) “
(Select the appropriate setting for your analog input source.)

A9-1. Another device is set as the default recording device
（Open the Sound and Audio Device properties tab and select USB Audio Device “Furutech ADL GT40α “ as the default recording device.）

A9-2. Check that connections are correct
(Check the connection between external components and the Phono/Line Input. If there is no problem with the external components, then check the cable connections.)

A9-3. Check if recording software (not supplied with GT40α) recognizes the GT40α as the default recording device
※ Recording software is required to record using the GT40α. Furutech recommends free-to-download software Audacity: http://audacity.sourceforge.net/

A9-4. Check to see if both Input and Output settings in the Sound or MIDI application are set to 24bit/192KHz
（It is recommended both Output and Input bit and sample rates be set to 24bit/192KHz）
Note: Both bit and sample rates for playback and recording in the Sound Application must be set the same when recording.

A10-1. During playback or recording the computer’s CPU overloads
(Especially during recording make sure all other computer applications are closed.)

A10-2. During playback or recording another USB device is connected to the computer
(The sound will cut out during playback or recording if another USB device is connected to the computer.)

A10-3. CPU is unable to process data fast enough
（If the CPU does not meet the required specifications the expected results may not occur. If the CPU meets the requirements, but the sound cuts out, close all other applications or adjust settings in the recording software）

A10-4. Check to see if both Input and Output settings in the Sound or MIDI application are set to 24bit/192KHz.
It is recommended both Output and Input bit and sample rates to 24bit/192KHz.

A11-1. The GT40α is placed too near appliances with strong magnetic fields like TVs or Antennas
（Place at a distance from appliances with strong magnetic field）

A11-2.  Check the computer’s AC adaptor
(There is the possibility that the Computers or Laptop’s AC adaptor is not providing stable quality power: Noise at 60Hz or 120Hz or both)

A11-3. Connections are not correct
(Check all terminals for correct connection)

A11-4. Check to see if both Input and Output settings in the Sound or MIDI application are set to 24bit/96KHz.
It is recommended both Output and Input bit and sample rates to 24bit/192KHz.

If noise is experienced while using GT40α with a turntable:
A11-5. Step one: Disconnect phono cable from GT40α analog line-in jacks momentarily and then reconnect.
A11-5b. Step two: Connect power sources for GT40α, turntable and computer to the same power strip / Power distributor.
A11-5c. Step three: Connect the GT40α ground wire to an earthed object.

A12: Yes, Please note that when pairing the GT40α with such actives speakers, before playback the GT40α volume should be set at its maximum and the speaker volume at its minimum. Volume would then be adjusted at the speakers.

A13: The GT40α has been designed to work with a preamp, but it puts out enough voltage to be paired with an amp and sensitive speakers and used directly with its high quality volume control

A13-1: The volume control will adjust volume for both the headphone output and RCA line out output.

A14: Yes, both 32bit and 64bit OS

A15: WASAPI is an OS application and may not be compatible with some playback software. Foorbar2000 software is known to be compatible with WASAPI.

A16: The GT40α USB DAC is compatible with computer based sound data only. Please upload PCM recorded data to your computer and then playback via the GT40α.

A17: the GT40α is compatible with Windows XP and the set-up instructions and the same as those of Window 7.
(Note* the GT40α Windows driver is not compatible with Windows Vista)

A18-1: No drivers are necessary with Mac computers and a single standard driver is required for Windows OS. The driver can be downloaded from the GT40α webpage. Please note that recording software is also necessary.
ADL recommends Audacity: http://audacity.sourceforge.net/

A18-2. Check to see if both Input and Output settings in the Sound or MIDI application are set to 24bit/192KHz
It is recommended both Output and Input bit and sample rates to 24bit/192KHz

A19-1. The GT40α is designed to be power by a DC 15V / 0.8A / 12W AC/DC Switching Adaptor only

A20. The volume control adjust volume output for both Headphone and Line Out jacks, so the GT40α can be used as a preamplifier

A21. No, the headphone output volume can only be adjusted with the GT40α’s volume control.

A22. yes, there will be signal output from the lineout jacks while headphones are plugged into the GT40αheadphone jack.

A23. yes, once you have updated to Yosemite and you find that the GT40α is not recognized, restart your MAC.

A24. No, you must uninstall the old driver and install the new driver which can be downloaded from the ADL GT40α webpage.

A25. Connecting a Self-power USB Hub between the GT40α and PC/Laptop can sometimes stabilize playback.

A26. NO. Do not switch between PHONO and LINE during playback. Doing so could damage speakers and/or componentry.

A27. While recording software is not included with the ADL GT40α, it will support many of the recording software that is available on the market. ADL has tested and can recommend free-to-download Audacity software. Question regarding the use of this software should be direct to the software maker.

A28. If the GT40α is connected via the GT40α’s LINE Input to the Mic recording device LINE output, it is possible.

A29. No, the signal will bypass the DAC
RCA LINE Input　⇒　Op Amp（Circuit1）　⇒　Variable Resistor　⇒　Op Amp（Circuit2）　⇒　RCA LINE Output

A30. The GT40α’s LINE Input level is M=0.4mV、MM=4mV, so it is not a problem.

A31. Playback and recording of 88.2kHz ・176.4kHz・192kH sample rates is no possible with the new GT40α.

A32. The GT40α is ASIO compatible. Install the ADL ASIO driver and select Furutech ADL GT40α in the desktop ADL ASIO tool and “Apply”. In the settings the ASIO buffer size should be set to 5 milliseconds.

A33. Yes

A34. The GT40α is USB2.0 High speed (480Mbit/s)

A35. No, only analog sources.

A36. Since other products ID codes will differ from the GT40α’s code it should not be necessary to uninstall other USB audio drivers. However if another product has the same USB chip as the ADL GT40α it may be necessary to uninstall the other product’s USB audio driver.

A37. If the analog input level is too high there is the possibility of distortion in the recorded signal, so it may be necessary to reducing the recording level using the Clip Signal switch (RecAtt/dB switch) on the rear of the GT40α. Switch between 0db, 6db and 12db for the appropriate level.

A38. During recording make sure both Input and Output bit and sample rates at set at the same level

A39. It is recommended that the Recording Level settings be at 50~90% and the WAVE MUTE settings at 5% (-19db). Note* It may be necessary to make other adjustments to these settings if distortion is experienced.

A40. This is not possible. The provided 15V switching adaptor must be used.
USB chip independent power: 5V DC from PC USB bus powers USB chip only.

A41. Yes, the GT40α driver is compatible with the A1
A41-1. : In the case you have both the GT40α and A1 and installed the A1 driver first, it is recommended that you connect the A1 to your PC and uninstall its driver. Then install the GT40α driver and the new driver will work for both GT40α and A1.
Note* When installing the GT40α driver do not connect the GT40α to the PC.
Note* Latest drivers for A1 and GT40α are available for download from 2015.01.22

A42. The signal does not pass through the DAC.
Please see the list below for signal paths in the GT40α

ADL GT40α circuit routes:

RCA LINE Input ⇒ NJM5532 OP Amp（Circuit1） ⇒ Variable Resistor (VR) ⇒ NJM5532 OP Amp（Circuit2）⇒ RCA LINE Output

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RCA LINE Input ⇒ NJM5532 OP Amp（Circuit1） ⇒ Variable Resistor (VR) ⇒ NJM5532 OP Amp（Circuit2） ⇒ MAX9722 Phone Amp ⇒ Phone Output

RCA Phono Input ⇒NJM2068 OP Amp（Circuit1） ⇒ Variable Resistor (VR) ⇒NJM5532 OP Amp（Circuit2） ⇒ RCA LINE Output

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RCA Phono Input ⇒NJM2068 OP Amp（Circuit1） ⇒ Variable Resistor (VR) ⇒NJM5532 OP Amp（Circuit2）⇒ MAX9722 Phone Amp ⇒ Phone Output

PC Playback ⇒ USB Input ⇒ VIA VT-1736 ⇒ CS-4270/DAC ⇒ NJM5532 OP Amp（Circuit1） ⇒ Variable Resistor (VR) ⇒ NJM5532 OP Amp（Circuit2） ⇒　RCA LINE Output

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PC Playback ⇒ USB Input ⇒ VIA VT-1736 ⇒ CS-4270/DAC ⇒ NJM5532 OP Amp（Circuit1） ⇒ Variable Resistor (VR) ⇒ NJM5532 OP Amp（Circuit2） ⇒ MAX9722 Phone Amp ⇒ Phone Output

RCA LINE Input ⇒ NJM5532 OP Amp（Circuit1） ⇒ Clip Detection ⇒ CS-4270/ADC ⇒ VIA VT-1736 ⇒ USB Output ⇒ PC Recording

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RCA Phono Input ⇒ NJM2068 OP Amp（Circuit1） ⇒ Clip Detection ⇒ CS-4270/ADC⇒ VIA VT-1736 ⇒ USB Output ⇒ PC Recording

A43. Recording of analog signal with Quicktime is possible. The recording format will 16bit/44.1kHz AAC and it is possible to playback using iTunes.
The files can also be played back using Windows Media Player 12 (Windows 7 or later) - Windows Media Player 11 or earlier will need codecs installed.

A44. Yes, this is possible. The switch on the front panel of the GT40α must be set to USB.

A45. Close Audacity and restart the PC. This can fix the problem. Also switching the default speaker setting from GT40α to the primary speaker on your PC can fix the problem.

A46. Yes, it is possible and a driver is not required.

A47. Yes, compatible.

A48. Yes, compatible.

A49. There is an incompatibility issue with the 2.1.1 version of Audacity when recording at 24bit/192kHz on Mac. The issue is not evident when using Audacity 1.3.14.

A50. This error means the USB device is not being recognized. Try reconnect the USB cable or try another USB cable or another USB port. Once the GT40a is recognized as the USB device in the sound application, uninstall the driver and reinstall.

A51. Go to Preference/Output/ASIO and uncheck “use 64bit ASIO drivers”. Also under “Components” click on “ASIO Support foo_out_asio and update