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Topping L70 Headphone Amp Review

Rate this headphone amplifier:

  • 1. Poor (headless panther)

    Votes: 14 4.4%
  • 2. Not terrible (postman panther)

    Votes: 2 0.6%
  • 3. Fine (happy panther)

    Votes: 29 9.1%
  • 4. Great (golfing panther)

    Votes: 272 85.8%

  • Total voters
    317

sq225917

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Cheap dac old and range topping mobile phone oleds aren't anything like the same thing, nit even the same sport.

That said this looks brilliant.
 

xaxxon

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Am I going to get a notable improvement if I connect my SMSL C200 to it balanced, and listen through the balanced headphone output? And this is not about volume or power.

My phones are open modded monoprice 1060C.

I am just so confused over the ‘balanced’ headphone output benefits. And I’m loving the new relationship I’m now having with headphones since the C200 purchase… and am trying to squeeze as much out of the headphones as possible.

First, there's no such thing as "balanced" headphones. It's just differential.


But because they often use the some jacks people conflate the two.

Second, no.
 

Endibol

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This is a review and detailed measurements of Topping L70 balanced headphone amplifier. It was sent to me by the company and costs US $349.
View attachment 247901
The L70 has the beautiful white segmented display. It is the most visible/high contrast display I have seen on an audio product. Volume control is very responsive and is relay based to provide perfect channel matching. You get both unbalanced and balanced output with the latter providing substantially more power. A remote control is provided. Back panel shows some nice extra features:
View attachment 247902
You have 12 volt trigger to power it on or have its power switch power other gear. A ground lift is provided as well to help with ground loops. And my favorite feature which is an included power supply.

A microprocessor controls the conditions of the unit and shuts it off or limits output as needed. Different error messages in the form of "r-" are provided when this happens. I pushed the unit routinely and repeatedly into clipping and overload with no ill effect. But please note that both headphone and power amps are subject to failures due to varying load/usage so if you are risk averse, you may want to wait for others to test it before deciding on purchasing it.

Topping L70 Balanced Measurements
I hooked up the L70 using its XLR input and measured its XLR balanced headphone output. In the next section you will see unbalanced performance. Let's start with our dashboard:
View attachment 247903
I was amazed to see distortion at incredibly low -145 dB! This is some 30 dB better than our best case hearing threshold! SINAD which sums noise and distortion is noise limited to the tune of 120.4 which lands the L70 near the top of our rankings:
View attachment 247904
Speaking of noise, that is also excellent:
View attachment 247905
50 millivolt rating is excellent and the only thing keeping it from topping the charts completely is the fact that there is no negative gain setting:
View attachment 247906

Still, 93 dB is superb meaning that you almost get the dynamic range of the CD even though you are listening at just 0.05 volts!

Frequency response is as flat as we need:
View attachment 247907

The low distortion shows off again in multitone test:
View attachment 247908

After noise, power is everything in a headphone amp so let's see how the L70 does with its XLR output:
View attachment 247909
I like to see > 100 milliwatts and the L70 accomplishes that in Low Gain!!! In high gain, it blows the doors open with 1 watt of power. This should let it drive high impedance with ease.

The dynamics get even better with 32 ohm:
View attachment 247910

We get a stunning 7 watts in high gain now! Even in low gain we have nearly 2 watts. And it does this while keeping its composure and not even clipping.

Changing the load we get the same superb results:
View attachment 247911

Topping L70 Unbalanced Measurements
Changing the output to 1/4 inch gets us the same superb dashboard:
View attachment 247913

Power is naturally low but still very healthy:
View attachment 247914
View attachment 247915

Topping L70 Listening Tests
I started testing with my Dan Clark Expanse headphone using XLR connection. This is a low impedance and insensitive headphone which breaks the back of many headphone amplifiers. Not here. The L70 dominated it like nobody's business. In high gain, I did not dare to get anywhere near the max volume. There was so much power that it drove the right channel of the headphone into crackling with bass notes. Mind you, this was *at extremely* high volume level. Way past threshold of comfort. Yet, the L70 had more power left on the volume control! The sound and overall experience was exceptional with super detail and dynamics.

I then switched to Sennheiser HD650 which is easier to drive. The sound was yet again superb with some 30 dB of headroom left on L70. If I didn't have to finish the review by taking a picture of the L70, I would still be sitting there listening to this combo! Even though the HD650 is deficient in bass you would not know it while driving it with L70. The sound was superbly clean and enjoyable.

Conclusions
As much as Topping has made us expect superb engineering, I am still surprised when I unbox and measure/experience their newer offerings. The L70 innovates with wonderful new front panel and incredible power and low noise and distortion. It has level of performance that enables you to buy and enjoy any headphone regardless of insensitive or difficult it is to drive. Nice features like R2R relay control solves the problem of analog volume controls causing channel mismatch, giving you a perfect experience even with sensitive IEMs/headphones. I like to find something to complain about I just can't!

It is my pleasure to recommend Topping L70 headphone amplifier.

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As always, questions, comments, recommendations, etc. are welcome.

Any donations are much appreciated using: https://www.audiosciencereview.com/forum/index.php?threads/how-to-support-audio-science-review.8150/
Super good headphone amp! I would say even better than necessary..
@Topping: now use your talents to bring us a 200 W @ 4 ohms power amplifier that beats the hell out of the competition!! And please don’t use Purifi units by Putzeys..that would be too easy..
By now we know that you guys can do great DACs and headphone amps.
 
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OP
amirm

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How come this SNR measurement at 50mV doesn't match the plot of THD+N vs power (8.3µW at 300 Ohm) ?
There are numerous differences in how those measurements are performed. For one, in the SNR test, the input is fixed at 4 volts and volume control on the unit is used to get 50 mv out. In the sweep, it is the reverse with input voltage is way lowered. The measurement bandwidth is also not identical which directly impacts noise levels. And THD+n has distortion in it even though the noise dominates. Finally, the SNR test uses AES filtering/test parameters which THD+N doesn't.

All this said, good observation! :)
 
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amirm

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I don't care for OLEDs either. There's should be a user programmable setting to shut off the display after a few seconds.
Pretty sure there is in addition to setting its brightness level.
 
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amirm

amirm

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I am just so confused over the ‘balanced’ headphone output benefits. And I’m loving the new relationship I’m now having with headphones since the C200 purchase… and am trying to squeeze as much out of the headphones as possible.
Answer is already given but here is a video I created to answer questions around balanced connections:

 

restorer-john

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Great review @amirm . And the display really is nice.

What is amazing is the residual noise on this thing. Your 50mV DR number correlates to just 1.12uV of noise. And even at 4V, the noise is only 2.13uV. It's quieter than anything I own or anything on my test bench. What an achievement.
 

Bleib

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I’m taking from your response then that sound quality with the sabaj compared to the smsl direct made minimal, if any, improvement.
Well, the Sabaj has more power so that's why it's being used with HE400se for movies. I haven't had so much time to compare yet though, I've only had the Sabaj since last week.
 

renaudrenaud

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For those who have some question regarding screen brightness level or independent output volume etc... You can download the user manual here


So, for the screen

Screenshot_2022-12-06-06-30-06-998-edit_cn.wps.moffice_eng.xiaomi.lite.jpg



Screenshot_2022-12-06-06-30-51-300-edit_cn.wps.moffice_eng.xiaomi.lite.jpg
 
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Rja4000

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There are numerous differences in how those measurements are performed.
Thanks for the answer.
For one, in the SNR test, the input is fixed at 4 volts and volume control on the unit is used to get 50 mv out. In the sweep, it is the reverse with input voltage is way lowered.
That means we should not compare the THD+N vs Power (or THD+N vs V) plots of analog HP amps with similar plots for DAC+HP combo amps, since, for the later, it is always the digital level that is lowered.

We see indeed (around) the same 93dB for both the 50mV SNR figure and for the THD+N vs power plot for the Topping DX7 Pro+, as an example.
 
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Sokel

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Labjr

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Shouldn't even display the current input while it's off because it will eventually dim and look like a VFD from an old VCR. You won't be able to tell if it's on or off since most tend to use the same input all the time.
 

Mike-48

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The L70 has the beautiful white segmented display. It is the most visible/high contrast display I have seen on an audio product.
I am grateful for the review of the Topping, but as far as displays go, you need to get around more! Attached is a photo of the Anthem STR Preamplifier. There is another mode that keeps the large volume display and adds other useful info.

str-pre-amp-1.jpg
 

oscar_dziki

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wow didn't expect it to "suck so bad" in the 50mv compared to the L30 ii.

I keep my L30 ii even if it picks up RF of my phone for some reason.
Yeah, with every measurement of new gear taken my E30ii l30ii combo presents itself as a bergain purchase, and everyday use experience confirms it as well.
 

okok

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this is really bad and overpriced

should make the L30II as flagship and and price at $500

and this mumbo? $119 to rival schiit (xmas $99)
 
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