9. DM15 R2R knob and menu setting instructions

[Volume/Menu Knob]

When functioning as a volume control:

Short press to switch playback modes, which are: Single Repeat, List Repeat, Shuffle Repeat, and Sequential Repeat.

Rotate clockwise to increase the volume; rotate counterclockwise to decrease the volume.

Volume Setting Instructions:

In Bluetooth output mode, the volume range is 0–16.

In PRE OUT mode, the volume range is 0–100.

In SPDIF OUT mode, the volume is not adjustable.

When functioning as the menu knob:

A short press acts as the confirm/selection key.

A long press enters the system menu; pressing long again returns to the previous menu level.

Rotating clockwise moves the on-screen cursor downward.

Rotating counterclockwise moves the on-screen cursor upward.

[System Menu Settings]

EQ

You can select from: OFF, JAZZ, POP, ROCK, DANCE, CLASSIC, HIP HOP, RETRO.

Bluetooth Pairing Mode (only displayed in Bluetooth output mode)

A list of Bluetooth receiving devices will be displayed, and you can freely choose the device to pair with.

Ripping Mode (only displayed in CD IN mode)

Supports ripping CDs to a USB drive formatted in FAT32.

Screen Brightness Adjustment

There are 5 brightness levels available: 20%, 40%, 60%, 80%, and 100%.

USB Settings

Settings for USB IN decoding mode. Supports USB 1.0 and USB 2.0 modes.

USB 2.0 supports higher decoding bitrates, while USB 1.0 offers better device compatibility.

Auto Screen Off

The screen will turn off after the set time has elapsed. Options include:

OFF (select OFF if you want the screen to stay on), 5 minutes, 10 minutes, 30 minutes.

Auto Shutdown

The device will automatically shut down after the set time has elapsed. Options include: OFF, 10 minutes, 30 minutes.

Software Version

Allows you to view the MCU, UAC, and Bluetooth version information of the DM15 R2R.

Language

Options: Chinese, English.

Firmware Update

Local MCU firmware upgrade.

Restore Factory Settings

Resets all parameters but does not downgrade the firmware version.

How to use the ESP on the DM15 R2R?

[Definition of ESP]

Electronic Shock Protection (ESP) is a convenient feature that ensures skip-free playback of music even when your MP3-CD player encounters vibrations or bumps during movement. Devices equipped with ESP functionality include an intelligent electronic buffer capable of storing various digital music formats, such as MP3 and WMA. This buffer automatically adjusts its content and the speed of the laser pickup to ensure smooth and uninterrupted music playback.

[How to Use ESP and Precautions]

For users with particularly high requirements for audio quality, it is recommended to turn off the [ESP switch] during use.

If you prioritize continuous disc playback, simply turn on the [ESP switch].

After ESP pre-reads data, the compression time varies: standard CD discs have a 60-second pre-read, while MP3-format discs have a 120-second pre-read.

*Note: Enabling ESP can improve playback stability but does not significantly enhance disc reading performance.