Currently, I don't see the advantage on ordering a Pre90. If Topping has an update for the Pre90, D90SE and A90D in the works, then most likely that would be the one to get instead of the current Pre90.
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Topping A70 Pro HP & Preamp Review
- Thread starter amirm
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Currently, I don't see the advantage on ordering a Pre90. If Topping has an update for the Pre90, D90SE and A90D in the works, then most likely that would be the one to get instead of the current Pre90.
1122333
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A70pro sounds excellent, it is a non dyed, transparent, and stretchy tone.
Secondly, I must give a thumbs up to its Preamplifier. I can't hear any difference between plugging the speaker directly into the DAC and the A70Pro, just like it doesn't seem to have passed through this device....
Secondly, I must give a thumbs up to its Preamplifier. I can't hear any difference between plugging the speaker directly into the DAC and the A70Pro, just like it doesn't seem to have passed through this device....
Veri
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Wire with gain!
mdunjic
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Nothing to wonder - other than its sexy looks, I can't see anything where A90D is better
Looove that dot matrix display for volume.
Unique , stands out as different
But A70 Pro beats it in everything else
Wire with volume control, you mean.
. . . and a headphone amplifier.
Can you test the range on the remote for us? That was an issue with some past Topping products.
How does an end user get the 12.6w at 32ohm out of this amp?
Is the reason Amir's measurements not as high as theirs because he's measuring at lower distortion?
Do amps in daily use somehow produce more distortion and reach more power?
I just don't get how they can claim that level of power if a person can't actually reach that in daily use.
Edit: I guess a better question would be under what conditions does the distortion and power increase to reach the 12.6w?
Is the reason Amir's measurements not as high as theirs because he's measuring at lower distortion?
Do amps in daily use somehow produce more distortion and reach more power?
I just don't get how they can claim that level of power if a person can't actually reach that in daily use.
Edit: I guess a better question would be under what conditions does the distortion and power increase to reach the 12.6w?
Last edited:
staticV3
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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.
I guess I really just thought that I was gonna read Amir's review and it was gonna be 12.6w. The numbers for the A90D and L70 were the same/close enough to their marketing but this one isn't.
What is max input voltage of this amp?
staticV3
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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. Any more info, happier.. why? ;)
www.audiosciencereview.com
Topping L70 Headphone Amp Review
Is anyone aware of the error codes that might come up on the L70? Mine came up with the code ‘r3’ when prompted to turn on via the 12V trigger, and then was unresponsive. I turned it off for a few seconds and then on again, and it’s now sweetly playing loud & clear again…
www.audiosciencereview.com
raif71
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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.
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.
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
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@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:
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:
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.
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