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Topping TP21 25WPC Class T TA2021 Digital Amplifier + Headphone Amp

4 Review(s)
  • Ideal for multimedia sound applications.
  • High grade components provide audiophile performance.
  • Space-saving small footprint perfect for desktop applications.
  • Tripath TA2021 Class-D/Class-T architecture for clean, efficient sound.

The Topping TP 21 is a so-called Class T integrated amplifier, based on the TA 2021 chipset.  the chip makes use of a kind of "Digital Power Processing", this is, more or less, a Class D amplifier with high rate switching properties. That is why they put the word "digital" into it. Actually, there's nothing really digital inside, not in terms of D/A conversion. You can view the official TA2021 datasheet, with detailed tech specs,  The Topping TP 21 is nothing else than a pure and simple application suggested by the chipset datasheet. No magic.


Technical Parameters:

Output Power 2 x 25W @ 4ohm, 2 x 14W @ 8ohm 
Signal-to-Noise Ratio (SNR) 98dB 
Dynamic Range 100dB 
IHF-IM Distortion 0.1% @ 1W, 4ohm 
THD Distortion
0.03% @ 9W, 4ohm
0.1% @ 12W 4ohm
0.1% @ 7W 8ohm
10% @ 25W 4ohm
10% @ 14W 8ohm 
Speaker OUT (Left) x 1 pair (+ / -)
Speaker OUT (Right) x 1 pair (+ / -)

Dimensions :(W)113mm x (H)43mm x (D)172mm




1 x TP21 Amplifier

1 x Power Supply


Packing List

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Edward Cameron-Reid1
Aug 11, 2015 11:35:59 PM
As I live in Australia, I would require a 240V power supply for the Topping TP21.
Can you supply the TP21 with a 240V power supply?
Aug 11, 2015 11:35:59 PM
Hi, This item just have DC Power 12-24V, Thanks.

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R. L. Helms
Jun 13, 2013 5:07:24 PM
I paid less than $100 for the amp, and was surprised how well it drove bass notes in some of the low cycle bass rifts with no distortion when playing some of my dubstep and reggae beats that I like to listen to. I'm using Bose over-the-ear headphones that are moderately priced, and until now I haven't really unlocked their full potential. It would be MUCH more expensive to find a similar-quality sound-card for my computer. The amp was a great way to go. The only con was I also had to buy a digital to analogue converter for the unit so my SPDIF port could couple with the coaxial ports on the back of the amp, but that cost less than $20, and all of the necessary cables were about another $10.
R. Pettengill
Jun 13, 2013 5:05:51 PM
The caps on my old JBL SE 460 have gotten a bit noisy and this has proved a great replacement at a fraction of the size and price. If you don't have low efficiency speakers or a very large room it has plenty of low distortion power.
Jun 13, 2013 5:05:11 PM
Topping T21 is a Great Amplifier for the Price. I played it connected to my Windows Laptop and Nuforce USB uDAC2 and iPhone. There is No Hiss or Hum even at Full Volume. Ran my Polk Audio Monitor 40 Series 2 Speakers. The Sound Quality is Awesome. I brought 2 Amps to compare and choose between Topping T20 and T21. I am glad I did, Topping T21 Packs little more power than T20. I observed T20 had a little bit more clarity and less thump than T21 at the same time T21 was packing more Power with Decent Highs and Lows. I ran the Amp continously for 3 hrs and i could not feel it getting hot at all.

Bottom Line: This is a Great Amp and I am happy with my purchase. If you want more power take a look at Tripath TA2022 series Amplifiers on shenzhenaudio.com.
Jun 13, 2013 5:04:35 PM
The Topping TP21 Power Amp is really living proof that cheap yet good quality audio equipment really does exist. While the previous reviews were all quite good, I was admittedly still skeptical. Besides, if you're an objective audiophile who also considers published specifications before purchasing equipment, the power rating is not very impressive. This is especially true when you notice that the 25 watts/channel rating is based on a 4 ohm load at 10% distortion while the 14 watts/channel rating is based on the more conventional 8 ohm load also at 10% distortion. No bandwidth/frequency range is even given with this power rating.

Of course, my curiosity got the better of me and I decided to try this unit because the price was right and my existing AudioSource amp was not working well for the patio speakers. Before ordering I also did a bit of homework and found out that power amplifiers with Class T topology behave very cleanly up until the point of clipping. This explains the ultra conservative power rating with the high distortion.

Having tried the power amplifier sans headphone output, I must say that I was very pleasantly surprised. Driving my somewhat sensitive patio speakers at levels loud enough to interrupt obnoxious conversation, the sound was still incredibly clean. There wasn't a hint of audible distortion and the bass was very full-bodied. To me this means that the patio speakers' 8-ohm load at fairly high volume was not taxing for the TP21 amp so it didn't congest the speakers' mid-bass where impedance load is usually at its lowest. Bravo! The midrange was also very transparent and the highs had a silky clarity without losing any bite. To be sure, this is a lot praise for what I heard through patio speakers but these speakers are very expensive for patio speakers and they have wide bandwidth for their size (47Hz - 20kHz, ±3dB).

Another reviewer commented on a loud click when turning the TP21 on. I didn't notice this with my unit. In fact, each time I powered on or off I noticed that an internal relay kicked in apparently to mute amplifier thumps from power surges (exactly what you'd expect from a decent home amplifier or receiver). So my experience was all good. Yet another reviewer stated that the left channel wasn't working until he plugged and unplugged the headphone jack. Well, I may be lucky because I didn't experience that either. Of course, quality control kinks may have also been ironed out since the older reviews.

I have nothing but admiration for this power amplifier. This power amp can be used for so many applications. I can picture using it for a homemade mini-stereo with a passive source switching device and a pair of audiophile speakers. Couple this setup with a Korora phono preamp, a high-end turntable and a CD player and you have a complete analog and digital source setup