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Topping Technology Co., Ltd

https://www.toppingaudio.com/

Tel: +86-20-37219489
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D90 III Discrete Firmware
Changelog
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V0.57 (November 18, 2025)

Fix: Abnormal display of PEQ configuration
Fix: Local configuration modification of filtering not taking effect
Fix: When EQ is turned off but still connected to the computer via USB, noise during adjustment can still be heard when opening Tune for adjustment
Fix: Preset EQ1 and EQ5 have issues; the combined filter gain exceeds 0dB, causing distortion during playback
Fix: The preamp gain of preset EQ5 exceeds 0dB when connected to the host computer
Fix: After restoring the device to factory settings, opening PEQ to download 5 configurations, waiting for a while, then closing PEQ and using the remote control to switch configurations to the left results in no sound from the device

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V0.54 (September 29, 2025)

Fix: When the device is turned on from standby mode, the USB input automatically switches to AES input.
Fix: After switching between C1/C2 channels, the PEQ (Parametric Equalizer) function becomes invalid, and Tune cannot read device information.

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V0.51 (April 25, 2025)

Fix: Abnormal volume when using IIS input or switching to other inputs

Fix: Device PEQ configuration cleared after factory reset

New: Added prompt when device PEQ is disabled

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V0.50 (April 23, 2025)

Fix: Incorrect sampling rate display when switching between UAC1.0 and UAC2.0 modes

Fix: Incorrect output amplitude for USB and IIS inputs

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V0.49 (April 1, 2025)

Fix: After muting high sample rates (greater than 192KHz), adjusting the device volume still produces sound.

Fix: Playing 768KHz music, certain operations could cause noise.

Fix: When music is playing, putting the device on standby and then turning it back on results in no output, requiring a restart.

Fix: After disabling the PEQ function, the mute function for high sample rates (greater than 192KHz) was not deactivated.

Fix: Muting high sample rates (greater than 192KHz) also muted 192KHz unintentionally.

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V0.44 (March 19, 2025)

Adjusted: Modified the five default PEQ parameters and their names.

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V0.43 (March 18, 2025)

* Fix: Some PEQ configuration settings cause distortion when playing certain music.

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V0.42 (March 12, 2025)

* Fix: Issue where the five default PEQ configurations were not taking effect

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V0.41 (March 10, 2025)

* Fix: The device did not save the five headphone configurations
* Fix: After restoring factory settings, the device configuration, originally L/R, changed entirely to L+R

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V0.40 (February 26, 2025)

* Fix: No output when song volume is low
* Fix: Distortion when pausing playback and adjusting volume without playing a song
* New: Independent left/right PEQ adjustment feature
* New: Five default PEQ configurations are saved locally and can be uploaded for selection on the host device

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V0.39 (Nov 15, 2024)

* Fix: The issue where enabling DSD Bypass resulted in noise when playing DSD64.

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V0.38 (Oct 30, 2024)

* New: Output polarity setting
* Fix: Slight pop sound when adjusting volume while muted
* Fix: Volume maxing out upon exiting standby mode

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V0.37 (September 21, 2024)

* Fixed issue where a brief press of the power button while displaying "see you" upon 
   shutdown resulted in signal output from the 12V trigger interface.

* Fixed issue where a long press of the power button during power-on led to entering DFU mode.

* Fixed issue where entering DFU mode was not possible when not using USB input.

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V0.36 (September 20, 2024)


* Fixed issue with the 12V trigger output interface not functioning.

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