Topping TP21 T-Amp Class T Mini Amplifier 25 WPC with Headphone Output

Brand:| Model: TP21
Product Video
The Topping TP21 features the Tripath 2021 Class T chip with 50 watts of power (25W per channel). Sleek design with advanced engineering for performance and longevity. For clean power in a mini amplifier that has headphone amplification, the Topping TP21 amplifier is the logical choice.
  • Tripath TA2021 Class-D/Class-T architecture for clean, efficient sound
  • High grade components provide audiophile performance
  • Ideal for multimedia sound applications
  • Space-saving small footprint perfect for desktop applications
  • Built in pre amp for use with headphones
  • Sleek faceplate making it unobtrusive
Part # 
Weight: 2.4 lbs.  
List Price$149.99
Regular Price$109.50
You Save28%
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Part # 310-310
Qty:  EA
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Product Details

Topping TP21 T-Amp Class T Mini Amplifier 25 WPC with Headphone Output

The Topping TP21 features brushed aluminum faceplate and black aluminum cabinet. The volume control is accentuated with a subtle blue LED illumination that when on surrounds the volume control. The unit features high quality gold RCA inputs and gold banana plug speaker connections. The on/off switch is located on the rear of the unit making the front of the amplifier clean and sleek.

A unique feature of the TP21 is the headphone output on the front faceplate. The headphone output has its own pre-amp that disables the speakers when headphones are plugged in and will easily drive any headphones in the 16-200 Ohm range. The Topping TP21 Class T amplifier is manufactured using the highest grade components, including ELNA audiophile grade capacitors, Dale resistors, and ALPS volume controls. Makes a great gift for yourself or any audio enthusiast.

Included in the box is the T Amp, a 12V 5A power supply, and USA 110V AC cord. If you've been searching for more power in a small amplifier that has headphone amplification, the Topping TP21 Tripath-based amplifier is the logical choice.

Features: Brushed aluminum faceplate and black aluminum case   Blue LED power indicator   T-Amp IC Tripath TA2021 Front-panel 3.5 mm headphone output Stereo (Left/Right) RCA audio inputs Left/right (+/-) pair speaker outputs Includes AC to DC power supply.

    Specifications: • Output power: 25W x 2 (4 ohms), 14W x 2 (8 ohms) Signal-to-noise ratio (SNR): 98 dB Dynamic range: 100 dB Input sensitivity: 200 mV THD: 00.03% @ 9W/4 ohms, 0.1% @ 12W/4 ohms, 0.1% @ 7W/8 ohms, 10% @ 25W/4 ohms, 10% @ 14W/8 ohms IHF-IM distortion: 0.1% @ 1W, 4 ohms Power requirements: DC 12V~14.6V, 5A, 5.5 mm x 2.1 mm jack Power efficiency: 81% @ 25W, 4 ohms; 88% @ 13.5W, 8 ohms Size: 4.45" W x 1.69" H x 6.77" D (113 x 43 x 172 mm) Weight: 1.37 lbs. (620 g).

      Product Specifications
      • Special FeaturesClass T
      Topping TP21 T-Amp Class T Mini Amplifier 25 WPC with Headphone Output
      • BrandTopping
      • ModelTP21
      • Part Number310-310
      • UPC844632090981
      • Product CategoryHome Audio Amplifiers
      • Unit of MeasureEA
      • Product Rating
        (15 Reviews)
      • Weight2.4 lbs.
      • California Prop 65

        Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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      Topping TP21 T-Amp Class T Mini Amplifier 25 WPC with Headphone Output
      Topping TP21 T-Amp Class T Mini Amplifier 25 WPC with Headphone Output is rated 4.6 out of 5 by 15.
      Rated 5 out of 5 by from good product - just not a 25W amp (but wait ...)The Tripath part that's used in this amp does not provide 25W output. At least not in this design. The TA2021 (A or B) does not reach 25W out unless it's got a 14.6V supply, and this product ships with a 12V supply. With a 12V supply, the Tripath part, screaming at the top of it's lungs (4 Ohms, 10% THD), does about 16.5 Watts.So keep that in mind for a sec, and I'll tell you how to improve the amp.Tripath shipped two versions of the TA2021 - there's the TA 2021A and the TA2021B. One of the major difference between the two was that the TA2021B was qualified for operation at the higher operating voltage of 14.6V. In order to qualify for operation at 14.6V, the TA2021 requires schottky diodes on the high side of the outputs (between the output and Vcc). These diodes eliminates potential overshoot from inductive loads, protecting the outputs of the device.If you look at the two datasheets for the parts, you'll see the added diodes. It's not clear from the photos if the Topping design includes these diodes, but since they ship the amp with a 12V supply, I'm guessing they don't use the higher voltage layout and diodes. That's too bad, but all is not lost.It turns out there's still some headroom in the TP21. If you can locate a 13.5V regulated supply (or, if you're handy, you want to modify the one they shipped), you can run the TP21 (even without the high-side diodes) at 13.5V safely. This will net you (into 4 Ohms) 17 Watts (1% THD) and 22 Watts (10% THD). At 12V the corresponding numbers are 13W and 17W.If you're really handy, you can just add the diodes yourself and get the numbers up to 20W and 25W (with a 14.6V supply). The .1% THD rating at this voltage is 16W.Everything else about this design looks very good (from what I can see in the photo). Lots of local capacitance, good choice of parts, tight layout. I'll probably buy one myself, though I already have several Tripath amps.
      Date published: 2015-01-08
      Rated 5 out of 5 by from Great productSound quality of this little amp is excellent. It's extremely compact - so a good option for a computer desk, office, bedroom or kitchen.I'm using it in a bedroom with a couple of bookshelf speakers. I recently watched a movie, and I was impressed with the tight full bass considering I only had a set of bookshelf speakers. Sound was great with music as well.It's not going to shake your house; you'll need more than 25WPC for super high volume, but it goes as loud as I want to listen with no deterioration in quality at high volume. I think the ideal application for this product is a bedroom, kitchen, office, etc. where you want high quality audio, but you don't have the space or need for a 5.1/7.1 home theater.This also seems like a great audio component for a kid's room. This amp plus a set of used bookshelf speakers would make a great starter system for a kid to connect a laptop or MP3 player.I'm already considering putting another one of these in my kitchen and connecting it to a laptop and some mini speakers.Watch for sales. There are a few variants of these Topping amps, and sometimes one configuration or another seems to have a big discount.The one feature that I'd love to add to this is a remote for power and volume. However, given the price, it's understandable that it's just a manual volume knob and power switch.
      Date published: 2013-09-18
      Rated 5 out of 5 by from Topping TP21 ClassGreat amp . Quality parts and performance. Would recommend !
      Date published: 2013-07-08
      Rated 5 out of 5 by from TP21 Front Panel Power SwitchWho sez you cant have a front panel power switch!I really wanted one for convience so I went for it. Lots a room inside - pretty simple if yer brave enough!Nice amp - Using it to drive motorcycle helmet speakers. I gutted a pair of respectable studio headphones and stuck the elements inside my helmet. Didn't feel like I had quite enough headroom using the headphone jack so I wired the elements direct to the speaker outputs. As noted by many others - remember the negatives are not common to each other - takes 4 seperate wires. Sound is really nice. Unfortunately at 50+MPH wind noise is pretty bad but at low speeds the sound quality it really good. No fault of the gear - just the way it is!
      Date published: 2013-07-06
      Rated 5 out of 5 by from Clean Little AmpWe're using this to power a pair of JBL Control 1 5-1/4" speakers. It has a clean, crisp sound with good bass. This amp doesn't have enough power for much larger speakers, unless your driving horns. For a small installation of bookshelf speakers it sounds great, runs cold and comes in a nice aluminum box.
      Date published: 2013-06-18
      Rated 3 out of 5 by from Sweet sound but not as much kick as I expected.I purchased this and Lepai LP-2020A+ at same time. Topping is very clean sounding but just did not have as much kick with volume turned up as I expected. Was just driving some Minimus 7 and other smallish speakers when testing. Feature wise, it would be nice to have 3.5mm input jack. The Lepai was more than adequate for my needs at about a third the price.
      Date published: 2013-04-27
      • 2015-03-28T07:14CST
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      Product Q&A

      Get your questions answered from other customers
      who own this product or have experience with it.
      If your question requires design or troubleshooting information,
      please email tech@parts-expresss.com  for a prompt reply.
      Topping TP21 T-Amp Class T Mini Amplifier 25 WPC with Headphone Output

      Can I run tv headphone output to this amp (3.5 mm plug to L/R RCA input) to power small bookshelf speakers (Energy Take5s) for tv sound? With this set-up would the tv remote likely be ok for use to control volume?

      Asked by: Jaxtitleman

      If I connect a headphone extension cable to the headphone jack will the amp continue driving the speakers until I plug a pair of headphones in to the extension cable?

      Asked by: pauldast
      Unfortunately no, the jack in the amplifier is switched so as long as there is something plugged into it, the speaker output will not work.
      Answered by: MattP
      Date published: 2015-03-02

      Hi, Good day! I'm planning to buy a Topping TP 21 for a portable boombox build. Before ordering I just want to be sure. Is it safe to run it with a 12v 7 ah sealed lead acid battery. I've seen a lot of Lepai running on 12v 7 ah source.  Thank you.

      Asked by: Jason29
      Yes this will work on any 12 VDC source.
      Answered by: MattP
      Date published: 2014-03-10

      This, or the TP41, or ...?

      I recently purchased a TP41 (from a different vendor; next time I'll be ordering from PE). It has an unreliable volume dial, so I am returning it. I'm wondering if it would be better to get the TP21, or the TP20Mk2, instead.My plans/needs: the amp is fed by a Logitech Squeezebox, which is fed FLAC files from my computer. The speakers are currently B&W 602s, but will be replaced (due to the B&Ws' size) by Overnight Sensations, once I finish them. The TP41 I got initially due to its power and the option of two inputs, but it's now twice the price of the TP21. Any avice appreciated, particularly on:a) the sound differences (if any) between the TP20, TP21, and TP41, andb) the power abilities. I will be playing the system in a fairly small room, at medium levels.I could also spring for one of the Toppings with a built in DAC, and skip the Squeezebox. Thanks!
      Asked by: bookmatch
      The only difference between this and a TP41 are the dual inputs and built in power supply. The amp sections are identical and will sound exactly the same. I would recommend the TP21 for two reasons, price and I have actually used it and it is a very good, reliable amplifier.
      Answered by: MattP
      Date published: 2013-07-19

      Powering via 12volt battery for off the grid use?

      Am new to Class T Amps and have some questions regarding the Topping TP21.I'm considering using this amp for a portable remote camp music system using my Sansa Fuze MP3 and a pair of bookshelf speakers. Would it work to power the amp from a Deep Cycle 12v Group 24 size Battery rated for 550 cold cranking amps? If so, where would I find a power cable to provide power to the amp's input connector?
      Asked by: NorCal
      The battery should power this unit fine. If your worried that the extra amps provided by the battery may harm the unit consider putting an inline fuse. If you don't mind destroying the included power supply you could splice the wire with butt connectors and some shrink wrap. I'm sure you could get a battery terminal cable from an auto parts store.
      Answered by: VictorE
      Date published: 2012-06-19

      Is this okay to use with a turntable and phono preamp?

      The word "digital" in the title has me wondering if an analog system would be a match with this amp.
      Asked by: knewburygreen
      Sure-go for it.
      Answered by: Fanden
      Date published: 2012-07-13
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