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GT40 USB DAC Q & A
Q1. Computer does not recognize the GT40
A1‐1. Not connected correctly
（Refer to manual and check if the GT40 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 GT40 to a computer)
A1‐3. Computer does not recognize the GT40 as both the playback and recording USB device
（Disconnect the USB cable and reconnect after 10 seconds. If it still does not recognize the GT40 restart
the computer.）
Q2.System error occurs when switching between settings on the GT40
A2. Switching between settings during playback
（There is a small possibility of an OS system error when switching between settings on the GT40 during playback.
Avoid switching during playback.）
Q3.There is no sound
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 GT40 USB DAC as default
playback device.）
A3‐4. There is a problem with the external amp or speakers
（Check the connection between external components and the GT40 LINE OUT RCA jacks.）
A3‐5. Headphones are plugged into the 6.3mm phone jack on the front panel of the GT40
（When headphones are plugged in, there will be no signal output form the Line Out jacks.）
Q4. No sound from computer internal speakers
A4. USB device is set as the default for playback
（When the GT40 is selected as default audio device for playback, there will be no sound from the computer
speakers which is perfectly normal.）
Q5. No sound through headphones
A5‐1. The volume is set too low on the GT40
（Adjust the volume on the front of the GT40 to the appropriate level）
(When adjusting volume level for headphones the Line Out RCA jack's volume level is also adjusted)
A5‐2. The GT40 power is not switched on
（Push the power button on the GT40 front panel. It will show as blue when switched on）
Q6. Uneven sound balance during playback
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Summary of Contents for ADL GT40
- Page 1 GT40 USB DAC Q & A ...
- Page 2 Q7. No sound from CD’s in the CD‐ROM drive 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) Q8. No sound via LINE IN RCA jacks 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 GT40 lights up green （If the selector switch is green, the computer is set as the sound source via USB.） A8‐4. Incorrect setting of the rear panel Input Selector Switch （Phono（MC）・Phono (MM) ・Line） （Select the appropriate setting for your analog input source.） Q9. Not able to record A9‐1. Another device is set as the default recording device （Open the Sound and Audio Device properties tab and select USB Audio Device GT40 USB DAC 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 GT40) recognizes the GT40 as the default recording device ※ Recording software is required to record using the GT40. 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 not set to 24bit/96KHz The TENOR chip used in the GT40 has a bandwidth limitation of 12Mbps (USB 2.0 full speed operation), and due to this limitation only one I2S input or output can be set for 24bit/96KHz application at one time. Therefore, under this condition, for simultaneous multiple‐channel applications other I2S interfaces must be configured at 16‐bit/48KHz or 16‐bit/96KHz. In other words, when recording it is necessary to set the audio Input on the computer to 24bit/96KHz (PC‐Sound application; MAC‐MIDI application), but do not set not the audio Output to 24bit/96KHz. The Output should be set to a lower 16bit resolution until recording is done. Then when you want to playback your 24bit/96KHz files through the GT40 you need to reset the output to 24bit/96KHz and reset the input to a 16bit resolution. Q‐10. Sound cuts out ...
- Page 3 A10‐4. Check to see if both Input and Output settings in the Sound or MIDI application are not set to 24bit/96KHz. The TENOR chip used in the GT40 has a bandwidth limitation of 12Mbps (USB 2.0 full speed operation), and due to this limitation only one I2S input or output can be set for 24bit/96KHz application at one time. Therefore, under this condition, for simultaneous multiple‐channel applications other I2S interfaces must be configured at 16‐bit/48KHz or 16‐bit/96KHz. In other words, when recording it is necessary to set the audio Input on the computer to 24bit/96KHz (PC‐Sound application; MAC‐MIDI application), but do not set not the audio Output to 24bit/96KHz. The Output should be set to a lower 16bit resolution until recording is done. Then when you want to playback your 24bit/96KHz files through the GT40 you need to reset the output to 24bit/96KHz and reset the input to a 16bit resolution. Q11. Noise and interference A11‐1. The GT40 is placed too near appliances with strong magnetic fields like TVs （Place at a distance from appliances with strong magnetic field） A11‐2. Check the computer’s AC adaptor (There is the possibility that the 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 not set to 24bit/96KHz. The TENOR chip used in the GT40 has a bandwidth limitation of 12Mbps (USB 2.0 full speed operation), and due to this limitation only one I2S input or output can be set for 24bit/96KHz application at one time. Therefore, under this condition, for simultaneous multiple‐channel applications other I2S interfaces must be configured at 16‐bit/48KHz or 16‐bit/96KHz. In other words, when recording it is necessary to set the audio Input on the computer to 24bit/96KHz (PC‐Sound application; MAC‐MIDI application), but do not set not the audio Output to 24bit/96KHz. The Output should be set to a lower 16bit resolution until recording is done. Then when you want to playback your 24bit/96KHz files through the GT40 you need to reset the output to 24bit/96KHz and reset the input to a 16bit resolution. If noise is experienced while using GT40 with a turntable: A11‐3. Step one: Disconnect phono cable from GT40 analog line‐in jacks momentarily and then reconnect. A11‐4. Step two: Connect power sources for GT40, turntable and computer to the same power strip / Power distributor Q12: Can the ADL GT40 be used directly with active speakers via the speaker’s RCA inputs? A12: Yes, Please note that when pairing the GT40 with such actives speakers, before playback the GT40 volume ...
- Page 4 Q13: Can the ADL GT40 be used as a preamplifier A13: The GT40 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. Q14. Can the GT40 be used with 64bit operating systems? A14: Yes Q15: Is the GT40 compatible with WASAPI? A15: WASAPI is an OS application and may not be compatible with some playback software. Foorbar2000 software is known to be compatible with WASAPI. Q16: Is it possible to connect linear PCM recorders directly to the GT40 via USB for playback? A16: The GT40 USB DAC is compatible with computer based sound data only. Please upload PCM recorded data to your computer and then playback via the GT40. Q17: The manual packaged with the GT40 does not show set‐up instructions for Windows 7. Is the GT40 compatible with Windows 7? A17: the GT40 is compatible with Windows 7 and the set‐up instructions and the same as those of Windows Vista shown in the manual. Q18: I would like to record LPs to hard drive. Is it necessary to install a driver? A18‐1. Installation of a driver is not necessary. However recording software is necessary. software Audacity: http://audacity.sourceforge.net/ A18‐2. Important note when recording: Check to see if both Input and Output settings in the Sound or MIDI application are not set to 24bit/96KHz. The TENOR chip used in the GT40 has a bandwidth limitation of 12Mbps (USB 2.0 full speed operation), and due to this limitation only one I2S input or output can be set for 24bit/96KHz application at one time. Therefore, under this condition, for simultaneous multiple‐channel applications other I2S interfaces must be configured at 16‐bit/48KHz or 16‐bit/96KHz. In other words, when recording it is necessary to set the audio Input on the computer to 24bit/96KHz (PC‐Sound application; MAC‐MIDI application), but do not set ...
- Page 5 We don't suggest replacing it if the no load output AC voltage over AC12V. A19‐2. The GT40 has a linear power transformer, not a switching mode power supply. Also the GT‐40's adaptor is an AC 9V 500 mA and cannot be replaced with a DC 9V 2A adaptor. Q20: Is it possible to connect linear PCM recorders directly to the ADL GT40 via USB for playback? A20: The esprit USB DAC is compatible with computer based sound data only. Please upload PCM recorded data to your computer and then playback via the Esprit. Q21: Does the ADL GT40’s front panel volume control adjust volume for the headphone output only or does it also adjust volume output for the rear panel Line Out jacks? A21: The volume control adjust volume output for both Headphone and Line Out jacks, so the ADL GT40 can be used as a preamplifier Q22: When the GT40 is connected to a preamp is it possible to adjust the headphone output volume at the external preamp? A22: No, the headphone output volume can only be adjusted with the GT40’s volume control. Q23: Is it possible to listen via external speakers (line out) while headphones are plugged into the GT40’s headphone jack? A23: yes, there will be signal output from the lineout jacks while headphones are plugged into the GT40 headphone jack. Internal use only: Q1: Unbalance (gang error) experienced when adjusting volume from 9 O’clock to lowest level: GT40 uses an analog type dual volume control and an unavoidable, however very small unbalance can be experienced in some units. Furutech has prepared select analog type dual volume control replacement parts for servicing such claims: Steps to resolve claim: 1. Have the unit returned and assess the level of unbalance 2. Compare with another stock unit and find a unit with no unbalance and send replacement to customer. Q2: Hum noise heard through headphone or system when power is off: Reason: High impedance when circuit is closed. When unit is switched on, noise disappears. Problem corrected in second production lot. Q3: Is it possible to record high quality analog signal on MAC OSX 10.6.4 application “Garage Band”? Is Garage Band ...
- Page 6 Q5: USB asynchronous (TE7022L) ISO > Adaptive mode > PLL +DPLL >Sync (less jitter). Not asynchronous. Q6: Sound suddenly cuts out during playback Cause: static electricity build up in low humidity conditions. Problem corrected in second production lot Q7: Noise experienced when GT40 is connected to a turntable Try connecting GT40, turntable and computer to the same power strip or power source Connected phono cable ground wire to GT40 earth screw Check the computer’s AC adaptor (There is the possibility that the adaptor is not providing stable quality power: Noise at 60Hz or 120Hz or both) Q8: MAC OS Midi application If the Midi setting is 24bit / 96kHz on both input and output, recording software may freeze. If the Midi setting is set to 16bit / 96kHz on one of either the input or output settings, recording software will not freeze. If the Midi setting is 24bit / 96kHz on input, output is set to 16bit / 96kHz: It is possible to save 24bit / 96kHz files on the GT40. (Windows OS: It is possible to save 24bit / 96kHz files) Q9: Is the GT40 compatible with MAC OS Lion? Yes. Q10: Computer does not recognize the GT40 There is possibility of a USB cable connector problem or PC USB port problem. Change cables or try another USB port. If not recognized on either MAC or PC, there is a possibility of GT40 USB socket problem. Q11: Is the data transfer bandwidth USB 2.0 or USB 1.0? The GT40 uses a TE7022L USB2.0 Full speed (12Mbit/s) limited DAC, not USB2.0 High speed (480Mbit/s). USB 3.0 SuperSpeed : 5 Gbit/s ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ USB 2.0 (TE7022L USB IC: USB 2.0 Full Speed compliant) ...
- Page 7 Q12. Sound from only one channel and noise is experienced: Playback from computer source is normal and noise is experienced when playback via line in jacks. Problem with unit’s phono or line input jacks. Q13. Power suddenly cuts out and power lamp fails to light. Problems still occurs after changing AC adaptor: Defective unit from 2 lot. Q14. Can a MC cartridge with output of 0.5mV (1kHz、5cm/sec.) be used with the GT40? GT40’s line input is MC=0.4mV、MM=5mV, so no problem. Q15. Is it possible to record instruments using a microphone? If the microphone component has line output jacks then it is possible to connect with GT40’s line input jacks Q16. Noise is experienced during recording of analog signal via USB connection: Past lots had this problem. It has been corrected in current lots. Q17. When headphones are plugged in a noise is experienced when the on/off switch is pressed: ...
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