Topping A70 Pro HP & Preamp Review

[raif71]

Take the Amp out of the box, give it power, plug in a DAC and Headphone, and turn up the volume.
No special configuration is needed to get 12.6W at 32Ω.


Yes.


No.


But a person can reach that in daily use.


High enough input voltage + high enough volume on the Amp.

Can a headphone with rated 32ohm be able to withstand the full 12.6W ?

 

[shuppatsu]

Can a headphone with rated 32ohm be able to withstand the full 12.6W ?

Any amp that can’t instantly deafen me is not worth my time.

 

[Sray]

What is max input voltage of this amp?

 

[Sray]

So, if you use the Ext90 with this, do the extra inputs also have the higher impedance? Or does the Ext90 have its own impedance?

I think the ext90 should be just an input switch box controlled by main box. The main input stage should be reside in A70Pro itself.
The guess is because performance doesn't change between main input and ext90.

 

[Music1969]

View attachment 286495

So at high gain output, it can only take 2Vrms according to that?

I don't think so ?

I would guess around the 10Vrms mark ?

 

[staticV3]

@Sray @Music1969
What Topping calls Input sensitivity is the voltage required at the input to clip the Amp's output with the Amp at 100% volume.

You can reduce the Amp's volume and feed it higher voltage than what that sheet says.

For example, According to Topping, the L70 in High gain has an input sensitivity of 1.9V:


Yet, if you reduce the volume so that the output doesn't clip, then you can input up to 10.4V with the Amp in High gain:

 

[Atanasi]

@Sray @Music1969
What Topping calls Input sensitivity is the voltage required at the input to clip the Amp's output with the Amp at 100% volume.

The low gain balanced sensitivities are probably close to the limit of the balanced inputs. When the amp is internally single-ended, balanced inputs go through op-amps before attenuation, and these op-amps have voltage limits. Single-ended inputs, on the other hand, can be attenuated as they are and can take higher voltages.

 

[nagster]

I don't know. Probably 9+ Vrms.

The only person I know who tests max input voltage is @nagster

See:

Topping A90 Discrete Review (Headphone Amp & Preamp)

I returned my A90D - much happier with my SMSL SP400 (47k ohm input impedance, also with stepped resistor relay volume control, and the best THX amp modulates AAA-888) No firmware issues.

www.audiosciencereview.com

Topping L70 Headphone Amp Review

Doe the L70 generate heat on standby? In addition to the observations of others: (my room temperature is 19°C) - without power the L70 feels 'stone cold' - in standby mode it doesn't feel cold anymore, but not warm either - switched on for 90 min. it feels warm but not hot

www.audiosciencereview.com

The A70pro seems like a very good HPA/preamp. However, I desperately searched for a reason to buy it, but there is already no place to install it. Hmm, toilet?
There is no surplus if it is a replacement, but there is no necessity to replace it. . .
I have attached part of the empty box.

 

[Veri]

The A70pro seems like a very good HPA/preamp. However, I desperately searched for a reason to buy it, but there is already no place to install it. Hmm, toilet?
There is no surplus if it is a replacement, but there is no necessity to replace it. . .
I have attached part of the empty box.

Yes. Toilet.

 

[August]

The A70pro seems like a very good HPA/preamp. However, I desperately searched for a reason to buy it, but there is already no place to install it. Hmm, toilet?
There is no surplus if it is a replacement, but there is no necessity to replace it. . .
I have attached part of the empty box.

Crazy fans!

 

[Sray]

The low gain balanced sensitivities are probably close to the limit of the balanced inputs. When the amp is internally single-ended, balanced inputs go through op-amps before attenuation, and these op-amps have voltage limits. Single-ended inputs, on the other hand, can be attenuated as they are and can take higher voltages.

Yep, it might clip the input stage. My previous experience when connect benchmarkmedia DAC3 without attenuation, ordinary preamp will clip even in very low output level.

 

[okok]

is this using the famous TPA6120 again???

 

[ra990]

Got this in today. I've owned quite a few Topping/SMSL products but this one feels higher quality. It has a nice weight to it, like the A90D. The volume feels good with clicking relays. The touchscreen is responsive and the display is actually very high quality. The menus provide a ton of options, like individual HP output selection toggle (first time in a Topping amp, I believe). Love the VU meter display. Driving my HE6SEv2 like a champ (in low gain).

 

[Blashyrkh]

The menus provide a ton of options, like individual HP output selection toggle (first time in a Topping amp, I believe).

The A70 pro menu provides the same options found in the L70 (plus those related to the display). Included individual output and Safe volume settings

 

[jruser]

Got this in today. I've owned quite a few Topping/SMSL products but this one feels higher quality. It has a nice weight to it, like the A90D. The volume feels good with clicking relays. The touchscreen is responsive and the display is actually very high quality. The menus provide a ton of options, like individual HP output selection toggle (first time in a Topping amp, I believe). Love the VU meter display. Driving my HE6SEv2 like a champ (in low gain).

Can you test the range on the remote for us?

 

[ra990]

Can you test the range on the remote for us?

Sorry, I didn't even unpack the remote as I don't plan to use it. The touch screen is pretty intuitive and responsive. I've kept the remote in the box and put the box away for now. Hopefully someone else who plans on using it can test this out for you.

 

[marcom22]

Can you test the range on the remote for us?

Yes can you test for us?

 

[AVKS]

Can a headphone with rated 32ohm be able to withstand the full 12.6W ?

Depends on the headphone driver.

 

[NexusOne]

The D70Pro is a bit expensive in comparison to the A70Pro. If the only point is sound quality with a hifiman headphone is there a big difference between Smsl D6 and D70 Pro or the best thing you can do is to save money and buy the A70Pro and D6 because you haven't got any big disadvantages?

 

[raif71]

The D70Pro is a bit expensive in comparison to the A70Pro. If the only point is sound quality with a hifiman headphone is there a big difference between Smsl D6 and D70 Pro or the best thing you can do is to save money and buy the A70Pro and D6 because you haven't got any big disadvantages?

My plan is to just get the A70Pro if I have sufficient funds of course . I'll just use any DAC that I already have with the a70pro. Part of the reasons getting the amp is it has more power, high input impedance and nice display (vu meter). Actually this is just a plan like I planned on getting the A90 discrete but decided not getting it at all. Plans can change.