DM7

· Please check that the audio file you are playing is multichannel, not stereo.

· Please check if the player you use supports multichannel processing or exclusive mode.

· Check if the settings of the player are correct.

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· Check the power connection.

· Check if the rear panel power switch is in the ON position.

· Try with another power cable.

· Try with another power outlet.

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· The device did not power on. Check the power supply.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted. For the PC, please check and adjust the computer system volume, music player volume and driver volume, and please select the default output device of your music player or computer as this unit.

· Try with another song and another music player.

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· Try with other songs.

· The specifications of songs are not supported by this unit.

· If the noise appears only when playing DSD files, please check and adjust the computer system volume, music player volume and driver volume to the maximum.

· Check to see if the problem is with the source, downstream equipment and cables.

· If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

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· Check to see if the problem is with the source, downstream equipment and cables.

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· Check the channel balance setting.

· Check to see if the problem is with the source, downstream equipment and cables.

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· USB cable did not connected properly. Please check or change the cable.

· Try with another USB port.

· Driver problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

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· Try to insert two fresh AAA batteries.

· Please aim at the remote control receiver.

· Bring the remote control close to the device.

· Use your Android phone's camera to look at the transmitter at the top of the remote, if it doesn't blink when you press the remote button, the remote is defective.

· If you have more than one Topping device, check that you are using the correct remote control.

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· Please check if DAC mode was set in setup menu (LO Mode | DAC). In DAC mode, the volume is not adjustable and is the maximum value, while in PRE mode the volume can be adjusted. Set it to PRE mode if you need to adjust the volume.

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· The choice of music player app, the setting of music player and the setting of computer/phone will all have an impact on the sampling rate.

· The sampling rate displayed by this unit is the sampling rate of the input signal, and it will not change the sampling rate by itself.

· If the music player can be set to exclusive mode, the audio signal will not be resampled by the computer/phone, so the sampling rate of the output signal is the sampling rate of the original file, and the sampling rate displayed by this unit is also the sampling rate of the original file.

· Because some players can't be set to exclusive mode, the audio signal will be resampled by the computer/phone and then output. So this unit will always display the sampling rate set by the computer/phone.

· We recommend using Audirvana player on MAC OS and Foobar on windows OS.

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· If you accidentally enter DFU mode, unplug and re-plug the power cable and reboot this unit. Try to re-flash the firmware if DFU is still displayed.

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· Please try ro re-flash the firmware.

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· Internal circuit protection triggered. Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

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· DAC abnormal. Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

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‍Can this unit connect to the RCA device?

· No recommended.

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‍How to adjust the channel balance

· By the channel balance setting on the unit.

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