I wonder if SNR is not using another method.
Like measuring the level of 50mV, then the noise without signal, then computing the difference.
Like measuring the level of 50mV, then the noise without signal, then computing the difference.
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Topping L30 II Review (Headphone Amp)
- Thread starter amirm
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Amir has given an answer in the L70 review.
Sgt. Ear Ache
Major Contributor
I'm looking very closely at this amp...which usually means I'm going to buy it soon lol. I currently have a Schiit Heresy driving my HE400i headphones. My reasons for considering the purchase have absolutely nothing to do with sound quality. The Heresy sounds jaw-droppingly great (as did the Liquid Spark I had before that which is now in a box with a bunch of other unused gear). I'm not under any illusions about the idea that I might hear some sonic benefit from the L30ii in comparison - I won't. But, the L30ii is only $200 (in Canadian funds) which isn't a huge expense and I'll get some extra power headroom, a 3 step gain option, a potentially nicer-feeling volume knob (one of the Heresy's minor little weak points) and a form factor that matches my E30 dac so that I can stack them instead of having them sitting side by side on my desk. Plus, I'll get to say I have pretty much the upper upper echelon of HP amp performance in my chain. I might get a blue one. 
solderdude
Grand Contributor
Plus you will get DC output protection and a better front layout.
Hey,
i'm a music producer and i recently bought this unit.
To my surprise today the unit started blinking and muting itself, but only when i played a certain sound that had an DC offset.
Is that some part of the units protection circuits or did i get a faulty unit?
Regards
i'm a music producer and i recently bought this unit.
To my surprise today the unit started blinking and muting itself, but only when i played a certain sound that had an DC offset.
Is that some part of the units protection circuits or did i get a faulty unit?
Regards
staticV3
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It's part of the protection circuit.
Consumer DACs should protect against DC on the output.
DC has no place in audio.
solderdude
Grand Contributor
The amp is DC coupled and has DC protection so that might be the reason.
You can try to determine at which volume setting this happens. Or, in digital format, remove the DC offset if possible (high-pass the song above 20Hz).
When it only happens with that song above a certain volume level and not with other songs the protection is simply doing its job.
You can try to determine at which volume setting this happens. Or, in digital format, remove the DC offset if possible (high-pass the song above 20Hz).
When it only happens with that song above a certain volume level and not with other songs the protection is simply doing its job.
That's definitely the way to go.
You shouldn't have DC component in distributed music
So you bought yourself a good DC detector
RME DAC....
it's not about a whole track, i was just playing around with a kick synth when this started happening
solderdude
Grand Contributor
Simply filter the bottom octave on that channel
If the DAC works like the ADI-2 Pro, you can (but you should not) disable the DC filter on the output.
AnalogSteph
Major Contributor
It doesn't seem to be balking much at 12 ohms, and the Verum appears to be fairly sensitive, so chances are good. Do note that low-impedance cans like this are extremely sensitive to poor contact and such, so an occasional cleaning of the plug won't go amiss.
I got my l30ii on aliexpress duribg 11.11sale at around 132 CAD... after tax and free shipping!I'm looking very closely at this amp...which usually means I'm going to buy it soon lol. I currently have a Schiit Heresy driving my HE400i headphones. My reasons for considering the purchase have absolutely nothing to do with sound quality. The Heresy sounds jaw-droppingly great (as did the Liquid Spark I had before that which is now in a box with a bunch of other unused gear). I'm not under any illusions about the idea that I might hear some sonic benefit from the L30ii in comparison - I won't. But, the L30ii is only $200 (in Canadian funds) which isn't a huge expense and I'll get some extra power headroom, a 3 step gain option, a potentially nicer-feeling volume knob (one of the Heresy's minor little weak points) and a form factor that matches my E30 dac so that I can stack them instead of having them sitting side by side on my desk. Plus, I'll get to say I have pretty much the upper upper echelon of HP amp performance in my chain. I might get a blue one.
Selkirks
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I recently started to get static playing some songs. Possibly related to high frequencies? The L30 II worked fine for 2 weeks on the same content. Adjusting gain and swapping headphones had the same results. Unable to replicate the issue with my other headphone amp (SMSL VMV A1).
Another dud from Topping?
Another dud from Topping?
Could you describe your current setup? Maybe something might not be in its best "implementation". I mean, once I had a similar situation with a L30 when I was using it with a dongle connected to a smartphone (no ground. But when it is fed by a D10s which is connected to a pc (grounded) - current situation. There is no noise.
solderdude
Grand Contributor
see post # 506:
www.audiosciencereview.com
Seems to be an issue. This would not become obvious in an audio test environment, only in an EMC lab.
Perhaps tinkering with ferrites as close as possible to the amp itself could reduce/remove sensitivity or some strategically placed small capacitors.
Topping L30 II Review (Headphone Amp)
Hi, I am not very familiar with the terminologies etc., wanted to know if the 2V input mentioned in https://audiosciencereview.com/forum/index.php?threads/topping-l30-ii-review-headphone-amp.36027/post-1262627 means the input from the wall via the power brick or the input from the RCA plugs from...
www.audiosciencereview.com
Seems to be an issue. This would not become obvious in an audio test environment, only in an EMC lab.
Perhaps tinkering with ferrites as close as possible to the amp itself could reduce/remove sensitivity or some strategically placed small capacitors.
How do you connect L30II with balanced cables?
This DAC has a ground pin. That's nice! But you have a pc and a balanced DAC connected to ground feeding a unbalanced and not grounded amplifier this might being causing a ground loop which is leaking to the L30. It isn't the safest approach to test it but if you have a power plug adapter without the ground pin you could leave the dac floating (it will remain grounded only by its USB connection) and check if the interference stops. In the case of it stops, I would recommend you to buy a USB isolator like the Topping HS01 or something similar or buy a balanced headphone amp.
Usually low votlage unbalanced devices with external power adapter has no ground in their power input - L30, E30, Sabaj A10h, A10d etc. The manufacturer expects the user to connect it in a grounded source device like a desktop or noebook. But some times the expected implementation is a little different from the user intention. I'm not saying you are wrong.
power plug adapter:
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Selkirks
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How do you connect L30II with balanced cables?
Sorry auto correct. I meant to write the issue occurs with different RCA and headphone cables.
What will the HS01 provide compared to the galvanic isolation in the SDA-6? I might have misunderstood the recommendation.
The vendor is requesting I return it.
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