Topping DX5 II Issue Log

Volume Memory Not Saved After Power Cycle

Issue: A software bug causes the device to forget the previous attenuated volume after a power cycle, defaulting to 0dB volume, which can be harmful to connected headphones.

Details (FW 1.39): The device has different remembered volumes for HPA for different line-out modes. It defaults to the volume remembered for DAC mode even when Preamp mode is selected. To ensure it starts at the last set volume in Preamp mode, a second power cycle is required.

DC Protection Issue

Issue: The DX5 II does not adequately protect headphones from DC in the audio signal, a feature present in earlier Topping products like the A30 Pro, L30, or L50.

Hardware: The DC protection circuit is present near the 4-pin XLR connector, but it appears to be non-functional.

Test Method:

• A music track known for high DC content ("Blue Light" by Bloc Party, Anti Gravity Remix) was used.
• A full amplitude DC test signal was also used.
• The DX5 II failed to shut down the output when these signals were fed in.

Additional Information: While most music has AC content, poorly mastered tracks can contain DC, potentially damaging headphones and speakers. Topping's previous devices reportedly handled such content well, but the DX5 II's implementation is insufficient. Even at a 10 o'clock volume setting on other Topping devices, the protection would engage, indicating a higher sensitivity to DC issues.

Relay Clicking

Observation: Relay clicking can be heard under certain conditions, even without a headphone connected.

Conditions:

• Clicking occurs every second or so when the device's output is in single-ended headphone out mode, volume is at maximum, and no music is playing.
• Clicking occurs down to -11 dB with a 1 kHz 0 dBFS tone, and when changing volume at 0 dB, even with a headphone connected.
• With no signal, it clicks after connecting or disconnecting a headphone, but not if the output is muted. It stops after 3 minutes of disconnection but resumes with a new signal.
• In high gain, clicking occurs at 10 dB lower volume. It does not occur on HPA BAL or HPA ALL modes, nor on LO.
• Clicking still occurs in HPA ALL when connecting a headphone to SE, but not when connecting to BAL.

Settings Wiped After Firmware Upgrade

Issue: Firmware upgrades completely wipe all user settings, requiring users to reconfigure their preferences after each upgrade.

Cannot Install Latest PC Drivers on Windows 11 (64-bit ARM-based system)

Issue: Users with Windows 11 on a 64-bit ARM-based system cannot install the latest Topping Tune PC drivers, as the system is not supported.

Bluetooth Pairing Button

Observation: The brightness button on the remote can be used for Bluetooth Pairing; the knob press did not function for this purpose.

Topping Tune EQ Parameters Not Showing Up on DX5II

Issue: Changes made to "Device Config" EQ parameters in Topping Tune do not always reflect on the DX5 II, with filters sometimes resetting to zero.

Workaround: Build the EQ in "Local Config", make changes, delete the "Device Config" EQ, and then add the modified "Local" EQ back to "Device". This method appears to work, but the interface and app require improvement.

Screen Bug When EQ is Turned On (V1.39)

Issue: A screen bug occurs when the EQ is turned on, causing the display to glitch. The image shows the device's screen with a spectrum analyzer display.

EQ Profile Not Sticking When Changing Inputs

Issue: EQ profiles do not persist when changing audio inputs. The profile must be re-selected, and toggling EQ on/off does not resolve the issue.

Unit Runs Very Warm, No Venting

Observation: The unit runs warm, and the housing lacks vents, which is noted as interesting. Adding vents is suggested.

No Way to Import Saved EQ Profiles

Issue: While EQ profiles can be exported as CSV files via the TUNE software, there is no apparent way to import them back, except for .txt files. Changing file extensions does not work.

Popping Sounds

Observation: Slight pops are heard in headphones during startup before relay clicks, even when HPA is not selected. Similar behavior may occur on line-outs.

Details:

• High gain is indicated by GAIN display below dB; slight pop on switching but no audible relay click. Audible relay click when HPA is selected. No interruption during playback.
• With no audio signal, slight pops occur on sample rate changes, seemingly independent of volume. Muting for 1-2 seconds occurs.

Sub Menu, Shown in Aurora Theme After Some Power Cycles

Issue: Sub-menus in all color themes, including the Aurora theme, display incorrectly after a number of power cycles or time. This behavior was observed even after multiple power cycles and persists across different themes.

Language Setting – Language Shown (ADDRESSED BY TOPPING – Already reported and verified to be fixed)

Observation: The language setting display is intentionally designed to be confusing. When English is selected, Chinese characters are shown. When Chinese is selected, Chinese characters in Latin letters are shown. Topping states this is an intentional design to help users unfamiliar with the device identify and switch back to the correct language without a full factory reset.

Display Shows kHz Improperly as KHz.

Issue: The display incorrectly shows "kHz" as "KHz". Topping has acknowledged this and stated it will be fixed in a future firmware update.

PEQ Profiles Not Saving After Device Off Then On

Issue: EQ profiles are not saved correctly after the device is turned off and then on again. This issue persists across different firmware versions (1.05 and 1.39) and operating systems (Windows 11 64bit).

Details: The "store to device" function in Topping Tune appears to work, but upon restart, the EQ profile is flat with all filters at zero. It is suggested that Topping Tune does not correctly transfer parameters to the device.

Topping Response: Topping has acknowledged the problem and is working on a firmware update to resolve PEQ saving issues, expected within 5-10 days of their July 3, 2025 response.