Topping A70 Pro HP & Preamp Review

[Tony Roma]

You can do a simple test, try swap the headphone connector (if your headphone has dual connectors), if the left channel start distort after swap then it's on the amp, if distortion still at right channel then it's on your headphone.
I think this amp is suit for low sensitivity planars, it can clip or destory other headphones easily.

Yes though I don't know why topping start putting orange LED in their new amps (EHA5, DX9), maybe it can make the sound warmer.

I have tried that and it moves to the left. This amp has supposed to have 17w output at 16ohms, my phones only require up to 6w at 16ohms, seems like this thing is running out of steam or just cant cope at higher output.

 

[Tony Roma]

Maybe yours is broken.

I think it is

 

[mantabjaya27]

Correct me if I'm wrong...
But if I feed 5V to A70 Pro using D70 Pro, it will have peak power of 4.1875 W @ 600ohm in high gain?
Or peak power of 37.5 W @ 600ohm in high gain?

 

[Ahmonge]

Correct me if I'm wrong...
But if I feed 5V to A70 Pro using D70 Pro, it will have peak power of 4.1875 W @ 600ohm in high gain?
Or peak power of 37.5 W @ 600ohm in high gain?

No, you’ll get the maximum rated power at a different volume put position.

 

[mantabjaya27]

No, you’ll get the maximum rated power at a different volume put position.

Ah... okay, but is my calculation correct? Are the numbers correct?

 

[Ahmonge]

Ah... okay, but is my calculation correct? Are the numbers correct?

No. The amplifier will deliver the maximum power stated by the manufacturer (1370 mW at 300 Ohms and 670 mW at 600 Ohms, balanced output, 0.1% THD+N ) at different volume knob positions. Increasing the volume If the volume is increased past this point, the output stage is saturated and only distortion is obtained.

 

[beq1990]

Hello, I have a question for the owners of the A70 pro: is it easy and fast to change te gain setting without using the remote? Or the gain setting is hidden someone in the menu? Thank you

 

[HYQID]

Hello, I have a question for the owners of the A70 pro: is it easy and fast to change te gain setting without using the remote? Or the gain setting is hidden someone in the menu? Thank you

it's in the menu's first page,very easy to find.

 

[Nordling]

it's in the menu's first page,very easy to find.

See page 10 in the user manual.

 

[ra990]

When using the C1 and C2 remote presets, the A70 Pro seems to default SE input for C1 and BAL input for C2 and this can't be changed. Is this a bug in my unit? Can someone else try this when they get a chance?

 

[HYQID]

When using the C1 and C2 remote presets, the A70 Pro seems to default SE input for C1 and BAL input for C2 and this can't be changed. Is this a bug in my unit? Can someone else try this when they get a chance?

It was reported before, and Topping has updated a new firmware to fix it.

 

[Kane1972]

Why is the L30 II missing from the chart in this review?

 

[Music1969]

It was reported before, and Topping has updated a new firmware to fix it.

I don't know any manufacturer that releases firmware updates for every analogue amplifier (without digital inputs) as Topping

This is why i wait 6 months after release for every Topping product

Even a simple pure analogue amp !

 

[Tony Roma]

My A70 pro has finally been accepted for return due to the distortion in the right channel.

 

[raif71]

Looking at both the Silver or Black in this picture, I think I prefer the Silver as the screen looks more pronounce as well as the jacks. Any silver owners here and what do you guys think?

 

[ommadusk]

This looks very nice, I like the clear display.

I've just ordered 2x Hypex Nilai500DIY Mono Kits and I'm thinking of adding this to my system which currently doesn't have an pre-amplifier. I'm currently using a Topping DX7 Pro+ DAC which has an XLR output voltage of 4.2v whereas other ones, like the D90SE/LE and D70 Pro Sabre, can output 5.2v or 5v respectively to XLR. I think, according to some posts I've read, that 5.2v or 5v would give me better sound than 4.2v. Is that right and do you think I should replace my DAC?

Here are the advertised specs of each mono amp https://kjfaudio.com/wp-content/uploads/2022/11/Nilai500-01xx-R2.pdf, and the review of my DAC https://www.audiosciencereview.com/forum/index.php?threads/topping-dx7-pro-review-dac-hp-amp.36978/ and its advertised specs here https://www.tpdz.net/productinfo/881473.html

I appreciate your help, thank you!

 

[Roen]

No. The amplifier will deliver the maximum power stated by the manufacturer (1370 mW at 300 Ohms and 670 mW at 600 Ohms, balanced output, 0.1% THD+N ) at different volume knob positions. Increasing the volume If the volume is increased past this point, the output stage is saturated and only distortion is obtained.

A70 Pro Desktop Headphone Amplifier-TOPPING

The chart implies the same amount of power if you use SE in or BAL in. I assume you'd need to get 4V in to get that sort of power, so how does one get 4V in with an SE DAC?

Are you saying that you'd get the max power at an earlier volume position on a 2V input as you would a 4V input?

 

[staticV3]

The chart implies the same amount of power if you use SE in or BAL in. I assume you'd need to get 4V in to get that sort of power, so how does one get 4V in with an SE DAC?

With SE out, max output voltage is sqrt(.33*300)≈9.95Vrms.
High gain with SE in is +13.8dB, so you need 9.95*10^(-13.8/20)≈2.0Vrms to saturate the output.

With Bal out, max output voltage is sqrt(1.37*300)≈20.27Vrms.
High gain with SE in is +19.8dB, so you need 20.27*10^(-19.8/20)≈2.07Vrms to saturate the output.

TL;DR: with both SE and Bal out, SE 2V in is enough to max out the A70 Pro's output.

 

[NiagaraPete]

Good news about more sane input impedance and the overall performance. I just can’t get excited about DAC/HP amp reviews anymore since I got my RME DAC.

I own a D30Pro and just bought (within 2 months) the RME ADI. You’re correct the RME is an outstanding device.

That said I have not been able to transition to it full time as it’s missing a deal breaker feature. “Auto on”.

With the Topping anyone on our network can simply hit Airplay and they have music or reinforcement to TV sound.

The RME you need to find the remote, turn it on select volume etc.

 

[Roen]

With SE out, max output voltage is sqrt(.33*300)≈9.95Vrms.
High gain with SE in is +13.8dB, so you need 9.95*10^(-13.8/20)≈2.0Vrms to saturate the output.

With Bal out, max output voltage is sqrt(1.37*300)≈20.27Vrms.
High gain with SE in is +19.8dB, so you need 20.27*10^(-19.8/20)≈2.07Vrms to saturate the output.

TL;DR: with both SE and Bal out, SE 2V in is enough to max out the A70 Pro's output.

Thanks!