There are 3 things to consider: settings, operation, and connection.

Please check each in the following sequence:

1) Confirm the audio output destination setting

1. Open rekordbox Preferences.

2. Click [Audio].

3. Check that each item is selected as follows:

■ Windows

Audio: DJM-A9 ASIO

Mixer Mode: External

Output Deck1 :DJM-A9 ASIO: CH1

Output Deck2: DJM-A9 ASIO: CH2

Output Deck3: DJM-A9 ASIO: CH3

Output Deck4: DJM-A9 ASIO: CH4

Output Sampler Deck: DJM-A9 ASIO: SAMPLER VOL

■ Mac

Audio: DJM-A9

Mixer Mode: External

Output Deck1:DJM-A9: CH1

Output Deck2:DJM-A9: CH2

Output Deck3:DJM-A9: CH3

Output Deck4:DJM-A9: CH4

Output Sampler Deck: DJM-A9: SAMPLER VOL

*If you can’t select the correct choice because it isn’t displayed or an error has occurred etc., refer to  "I can't set [AUDIO] in the rekordbox Preferences correctly."

2) Check the volume level operation

1. Play a track.

2. Set the [TRIM] knob to the center (12 o’clock).

3. Slide the channel fader to the top.

4. Slide the crossfader to the center.

5. Turn the MASTER [LEVEL] knob to 2 o'clock.

If the MASTER [LEVEL] indicator lights up more than halfway, there’s no problem with the settings and operation.

If you don’t hear any sound from the headphones at this point, check the following:

6. Turn the [MIX] knob for HEADPHONES A/B to the center.

7. Turn the [LEVEL] knob for HEADPHONES A/B all the way to the left.

8. Press the MASTER [CUE] button.

9. Turn the HEADPHONES A/B [LEVEL] knob slowly to the right.

3) Check the connection of speakers and headphones

For details, see [Connections] in the Instruction Manual.

Even if you’ve already connected them, reconnect them to make sure they’re properly connected.

You can read the Instruction Manual [here].