Devialet amplifiers offers Tone and Balance adjustment possibilities. To access and exit these controls, do a long press (2s) on the "Bass" on a D-Premier or the Mute key on a Devialet 250, 200 & 120. Navigate through this menu with short presses.
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The tone control is unique in the sense that you can define the exact bass or treble frequencies where you want the correction to operate. This can be defined in the "control settings" section on the online configuration tool. Note that by default, the frequencies are set to 100Hz and 2kHz.
The balance control lets you correct problems due to unusual geometry of the listening room. By default, the unit will automatically switch to mono as soon as you attempt to adjust the balance on the remote control. This is helpful in case the musical content is different on the left and right channels when adjusting the balance. You can also configure your unit to stay in Stereo during balance adjustments. This has to be defined in the "control settings" section on the online configuration tool.
Note that both balance and tone adjustments are automatically memorized as soon as you leave the menu item.