Topping A30Pro Review (Balanced Headphone Amp)

[Sharur]

When in "off" mode my a30pro is making a high pitched noise.

 

[Sharur]

front off switch is basically unusable...

 

[aandres_gm]

front off switch is basically unusable...

It also keeps using energy when on that standby, which is why I keep to the back switch.

 

[Sharur]

For real? How can an amplifier produce sound (even faintly) with its inner parts and no speaker attached? Coil-whine yes but actual sound like playing a song? Never heard of any case like that? Someone else willing to check their unit for this?

wtf just tested this and it works

 

[Raex]

wtf just tested this and it works

Really? So you can hear music coming out of the amp itself while no headphone is connected? (Not the coil whine in the video)

Cidious said his unit is dead silent (music-wise) so if yours really does play music with its inner parts, there have to be different revisions with different parts being used.....

 

[Curupira]

wtf just tested this and it works

How the hell would an electrical circuit play music without having a transducer? I get coil whine but actual music makes no sense to me... I joked about it previously because in vinyl you can hear it close to the stylus, but it is a very different concept.

 

[Curupira]

What a joke from SBAF! View attachment 144579They messed up the setup producing completely different test that looks bad in the first glance.
That's +-0.5dB down to -50dB attenuation. This is basically our internal criteria for the channel matching. In fact our criteria is -40dB. His particular unit is already 10dB better.
The A30pro measured here has roughly the same performance +-0.5 at -50dB.
View attachment 144582
If you have a look at A90's and a50s review it's basically the same too.
View attachment 144580View attachment 144581
We did test the L30 sent to Amir and we didn't find it to be so perfect. Also this test has run to run variance. There's basically nothing wrong.
But it's very expected behavior from SBAF.

I get the bias but still, wouldn't a digital control relay meet your own criteria much better? It's like the SINAD argument for me: a lot of gear manufacturers make the case that once you've reached -100dB it makes no sense decreasing it even further, but the industry and brands like topping are still (thankfully) releasing incrementally better measuring stuff year after year.

 

[JohnYang1997]

I get the bias but still, wouldn't a digital control relay meet your own criteria much better? It's like the SINAD argument for me: a lot of gear manufacturers make the case that once you've reached -100dB it makes no sense decreasing it even further, but the industry and brands like topping are still (thankfully) releasing incrementally better measuring stuff year after year.

Yeah. The reason is cost. You can see some in the future I would say.

 

[Blaze_NY]

Just got the amp in today and wow it has some power

 

[Sharur]

How the hell would an electrical circuit play music without having a transducer? I get coil whine but actual music makes no sense to me... I joked about it previously because in vinyl you can hear it close to the stylus, but it is a very different concept.

I'll record it

 

[Sharur]

@Raex @Leiker535

 

[Blaze_NY]

@Raex @Leiker535

wtf i tried this on my unit and its silent there's some witchcraft going on with yours

 

[Sharur]

wtf i tried this on my unit and its silent there's some witchcraft going on with yours

not something that i would ever encounter under normal use so I don't care about that. The coil whine on the other hand...

 

[vco1]

The coil whine on the other hand...

Is that a structural issue with the A30Pro?

 

[Sharur]

Is that a structural issue with the A30Pro?

I don't know what's causing it. Maybe @JohnYang1997 can explain

 

[JohnYang1997]

I don't know what's causing it. Maybe @JohnYang1997 can explain

I cannot reproduce it.

 

[Raex]

I cannot reproduce it.

The coil-whine, the "internal speaker" or both?

 

[Raex]

wtf i tried this on my unit and its silent there's some witchcraft going on with yours

Did you put it in high gain and tried with both inputs (XLR and RCA) or maybe set the volume control very loud.....?

 

[usern]

Has anyone noticed that when you unplug all your headphones while playing audio on high gain, and put your ear right next to the amp you can faintly hear the audio coming from inside the amp? I wonder from which component. it doesn't matter to me, just find it interesting.

Not happening on my A30pro. I'm using XLR inputs though.

 

[Veri]

The coil-whine, the "internal speaker" or both?

The latter :/