Topping DX5 II

[Roland68]

It won’t damage the device. Similar to all other topping devices, the circuit has over current protection.
The mosfet will operate in saturation mode, and the current will be limited.

I've seen hundreds of amplifier protection circuits fail in my life, and often speakers or headphones were damaged as a result.
I've also measured headphone cables where not only the right and left connectors were combined, but also connected to the chassis ground (4-pin XLR) or ground (4.4mm Pentacon).
Many of these cable suppliers have no idea what they're doing.

And I'm sure that neither Topping nor you will provide compensation if a customer damages their DX5 II or their headphones, which cost several hundred or thousands of euros, with such a cable.

How do you do that?

You can easily measure such a cable with a multimeter. Without headphones connected to the cable, none of the five connectors on the 4-pin XLR and Pentacon should be in contact with each other.
If the right and left connectors are connected together (not ground), it's a SE cable, which should only be connected to SE amplifiers.

 

[audiofun]

I've seen hundreds of amplifier protection circuits fail in my life, and often speakers or headphones were damaged as a result.
I've also measured headphone cables where not only the right and left connectors were combined, but also connected to the chassis ground (4-pin XLR) or ground (4.4mm Pentacon).
Many of these cable suppliers have no idea what they're doing.

And I'm sure that neither Topping nor you will provide compensation if a customer damages their DX5 II or their headphones, which cost several hundred or thousands of euros, with such a cable.

it's not protection circuit. it's power supply controlled by mosfets. the mosfets provide the positive/negative 15V rail for everything in the headphone amplifier circuit.
Simply shorting the output will trigger current limiting of the mosfet. You may think it as a low current constant current source. when the current is fixed and resistor is so low, the power output is close to zero.

and that's only one part of the limiting. op amps / voltage regulators for the hp amp also have internal current limiting/protection and overheat shutdown feature. There are also fuses right beside the switching power supply to shutdown the entire unit.

Electric devices do fail for a lot of reasons, and sometimes speakers / headphones are damanged. But using cables to short the output is not one of the reason.
All HP amps are designed to guard against overcurrent, using one way or another, because the moment you insert the headphone jack into such a device it creates a temporary short anyway.
If you don't trust the above circuit, then nothing else is safe.

anyway. I have several rounds of conversation with you in this thread here. it seems you don't really understand electronics and manufacturing.
It's very hard for me to believe you ever work in such industry.

 

[Roland68]

it's not protection circuit. it's power supply controlled by mosfets. the mosfets provide the positive/negative 15V rail for everything in the headphone amplifier circuit.
Simply shorting the output will trigger current limiting of the mosfet. You may think it as a low current constant current source. when the current is fixed and resistor is so low, the power output is close to zero.

and that's only one part of the limiting. op amps / voltage regulators for the hp amp also have internal current limiting/protection and overheat shutdown feature. There are also fuses right beside the switching power supply to shutdown the entire unit.

Electric devices do fail for a lot of reasons, and sometimes speakers / headphones are damanged. But using cables to short the output is not one of the reason.
All HP amps are designed to guard against overcurrent, using one way or another, because the moment you insert the headphone jack into such a device it creates a temporary short anyway.
If you don't trust the above circuit, then nothing else is safe.

anyway. I have several rounds of conversation with you in this thread here. it seems you don't really understand electronics and manufacturing.
It's very hard for me to believe you ever work in such industry.

And I have the same impression of you, which is strange.

According to your statement about the voltage regulators, the problem couldn't have occurred in Topping's first L30. Nevertheless, the headphones were damaged in a handful of units.

Even though I've been working with audio circuits for over 35 years and occasionally collaborate with manufacturers, my expertise lies more in the high-energy products we produce for global industry. However, things are a bit more strict and responsible there, as we do in the kV and kA range.
It's strange that we/I also regularly consult in the industry, especially in product development, feasibility studies, and production.
But perhaps our areas are too different, just like our perspectives, experiences, and opinions.

 

[Ongii]

For German users: I am selling my DX 5 II in black, as I got a good offer for a Luxsin X9.
If you are interested, drop me a private message.

 

[Tano]

I don't want to increase the already high negativity on this thread, but this device is annoying as F and really broken. I was "ok" with all the bugs I found until now, even if the PEQ wasnt working...
But now I just turned on my device after a few days without using it and all the config is gone. I had everything set up for my headphones and speakers and it's gone. What the freaking hell is this? A gameboy with a button battery?

I am sorry but this really makes the unit nearly unusable for me and it's clearly a dealbreaker.
No product with this flaw should be released by any means.

I am going to wait a couple weeks to see if they fix anything, otherwise I will be selling it and keep my SMSL C200.

 

[Tano]

Quick update. I just spent like 10 minutes saving my config again. Turned off and on and all was gone again. Im returning my unit.

 

[jodrim]

Quick update. I just spent like 10 minutes saving my config again. Turned off and on and all was gone again. Im returning my unit.

When you say saving do you mean saving by holding the C1 or C2 button on the remote? I posted about a similar issue a few days ago but it just fixed itself randomly, potentially after playing around with the config buttons. And this was with firmware v1.39.

 

[Joachim Herbert]

Why don't you just wait for the next firmware release that is supposed to fix this and then some?

Is it really that hard?

 

[Tano]

When you say saving do you mean saving by holding the C1 or C2 button on the remote? I posted about a similar issue a few days ago but it just fixed itself randomly, potentially after playing around with the config buttons. And this was with firmware v1.39.

No, it saves the C1 and 2 properly. It just resets itself after I turn it off and on. It ask for the language when it's starting and then there's nothing saved. This happened to me before installing the new firmware and seemed to be fixed, but it's not.

 

[Tano]

Why don't you just wait for the next firmware release that is supposed to fix this and then some?

Is it really that hard?

I have one month to return it and I don't want to end up with a DAC/AMP that factory resets every time randomly. I don't think it is that hard to understand. It's ok with the PEQ bug, but how can you release a device that can't properly save your settings?

 

[Joachim Herbert]

I don't want to increase the already high negativity on this thread, but this device is annoying as F and really broken.

I think you do. Your language speaks for itself.

 

[Tano]

I think you do. Your language speaks for itself.

Do you want to defend a product that factory resets itself? Please go ahead a give me a reason why I should keep a device where I need to dial up all my settings to use it everytime I want to hear some music?

Do you actually even own the unit?

 

[Joachim Herbert]

Do you actually even own the unit?

Sure. Headphone setup in the living room. Using it several times a week.

... but this device is annoying as F..

I understand you're not happy but this is not acceptable language, no matter what.

And it goes on like this in your post.

 

[Tano]

Sure. Headphone setup in the living room. Using it several times a week.

I understand you're not happy but this is not acceptable language, no matter what.

And it goes on like this in your post.

And are you having the same factory reset problem as me? If not, it means that my unit is flawed, so more reason to send it back.

My language is caused by the annoyance of the malfunction of the device. I didn't insult or attack anyone, so I don't think I did anything wrong.

 

[Sokel]

Sure. Headphone setup in the living room. Using it several times a week.

I understand you're not happy but this is not acceptable language, no matter what.

And it goes on like this in your post.

Now wait, if it was against another member we would all step in too.
But it's just gear, they come and go, there are here to serve us.

Peace of mind is the first and foremost quality, if some gear are annoying they deserve any language.

 

[Joachim Herbert]

Maybe I am just too old to communicate by swearing. I think it is not appropriate, be it towards people, companies or some piece of equipment.

My opinion, but who am I to judge.

 

[ICIETDIYEUR]

Hi.
I wouldn't want to be in the shoes of those who first bought this unit......indeed, I think the reason TOPPING is taking so long to release new units is because I think it was impossible to solve the problems encountered with a 'simple' new firmware without having to modify certain things in the circuitry

Only the future will confirm this or not.

 

[JIW]

And are you having the same factory reset problem as me? If not, it means that my unit is flawed, so more reason to send it back.

My language is caused by the annoyance of the malfunction of the device. I didn't insult or attack anyone, so I don't think I did anything wrong.

@jodrim had a similar if not the same issue. Somehow it is no longer an issue.

J

Post in thread 'Topping DX5 II'

Jul 14, 2025

I just got this device but it doesn't seem to save any settings between restarts like colors, gain, etc. I also have to select language each time it starts. Is this normal? I've upgraded to the latest firmware 1.39

• jodrim

J

Post in thread 'Topping DX5 II'

Jul 14, 2025

This is not normal. How do you turn it on?

It does a factory reset when the volume knob is pressed when the mains power is connected.

Yeah weirdly it's not an issue anymore. It happened when I flipped the rear power switch on/off during my first hour testing it but now it seems to save properly. I did have the USB plugged into my PC with the Topping Tune software so maybe some bug happened there after the firmware update? I hadn't put a battery in the remote yet so maybe I accidentally pressed some button on the device but I don't think I did. I'll write another message if I can...

• jodrim

 

[Tano]

@jodrim had a similar if not the same issue. Somehow it is no longer an issue.

J

Post in thread 'Topping DX5 II'

Jul 14, 2025

I just got this device but it doesn't seem to save any settings between restarts like colors, gain, etc. I also have to select language each time it starts. Is this normal? I've upgraded to the latest firmware 1.39

• jodrim

J

Post in thread 'Topping DX5 II'

Jul 14, 2025

This is not normal. How do you turn it on?

It does a factory reset when the volume knob is pressed when the mains power is connected.

Yeah weirdly it's not an issue anymore. It happened when I flipped the rear power switch on/off during my first hour testing it but now it seems to save properly. I did have the USB plugged into my PC with the Topping Tune software so maybe some bug happened there after the firmware update? I hadn't put a battery in the remote yet so maybe I accidentally pressed some button on the device but I don't think I did. I'll write another message if I can...

• jodrim

Thanks. I had this issue in the beggining but it seemed to be fixed. However, I didn't use my unit for 4 days. Today, when I started it, it asked me for the language at the beggining and I knew that something was wrong. Then, I dialed all my settings again, saved it and turned it off and on and I got a reset again...

 

[Gibsonian]

Hi.
I wouldn't want to be in the shoes of those who first bought this unit......indeed, I think the reason TOPPING is taking so long to release new units is because I think it was impossible to solve the problems encountered with a 'simple' new firmware without having to modify certain things in the circuitry

Only the future will confirm this or not.

I think you may be correct here