TOPPING TP21 Class T Digital Mini Amplifier with Headphone 25 WPC

Having owned a Sonic Impact amp many years ago, I know how good a class D amp can sound. Reading the Topping TP21 spec revealed a T2021 chip surrounded by the kind of audio grade components you don't expect to find in a £58 amp. On paper it looked like it should blow the Sonic Impact out the water and reading a review at [...]further reinforced that view. Unboxing the amp was the first surprise. The casework would be considered good at a much higher price. The face plate is thick brushed aluminium with legends milled into the surface. Not screen printed, but milled! You might expect that on a £500+ amp but not £58. Even the volume knob is solid aluminium with a milled edge and a small depression cut into the surface to indicate its position on the volume scale. The rest of the case is a black extruded aluminium box. Still good at this price point. At the back are quality gold plated sockets and a decent power switch. By now I was expecting this amp to perform as well as it looks. Well, after a 48 hour burn-in, it just did that. Strangely, it doesn't seem to have much character that I can pin down. And that's a very good thing in hi-fi. You don't want components in your hifi adding anything to the music. This amp sounds good out of the box and it sounded even better when I changed the supplied PSU for a Russ Andrews Power Pak II. These are no longer available but cost over £100 when they were. You may think spending twice the price of the amp on a power supply is a little out of proportion. All I can say is you can't get this quality out of any £150 amp I am know of. If you are looking for new amp to drive sensitive speakers, or just headphones, I highly recommend the TP21.

I bought this to replace a 35 year old Technics SUV150 amp that had lost a channel! This unit measures about a fifth of the size of that old amp, yet produces as much power (if not slightly more) with less THD, better S/N ratio, and clearer harmonics across the frequency range. Don't be put off by the lack of tone controls, D/A convertors, and input selectors. If you are connecting it to a computer soundcard, these will provide all of those capabilities. My soundcard is a SoundBlaster Audigy RX, and the clarity and quality of the sound it produces, is admirably demonstrated by this amp and the Gale monitors I have hooked up to it. I am very pleased!

Seeing as it's near impossible to find a reasonably priced full sized amplifier anymore, seeing this gave me some hope, though I was a little worried as to how such a small device would work.Glad I took the plunge. It powers my bathroom's ceiling mounted speakers well. My only regret is getting a version of this amp that doesn't give full control over treble, bass, etc. The sound it produces can be a little flat.

This amp had a fault which produced flat spots at varying frequencies, different on each channel, so I sent it back and got a refund. However the impression I got was that without the fault it would have sounded very nice. Shame.

I was looking for something physically small to replace an Arcam Solo Mini but still wanted a decent sound. I was very pleasantly surprised by the sound quality of this little amp. It punches way above its price point in my view. Good build quality as well.I think it sounds better than the Arcam Solo Mini which is very highly rated by WhatHiFi and costs £800. OK so we are comparing different things as the Arcam has a CD player, tuner, clock, remote etc. and multiple inputs. The Topping has one input only and no remote. But for sound quality its great.I had seen the other reviews, and for £47 I thought I'd take a chance - I'm glad that I did.If all you need is one input I highly recommend it (I have it connected to a Dac with multiple digital inputs)

Used to power some external speakers for he TV. Does the job, is smal enough to hide away. Only complaint is the speaker terminals won't take 6mm cable. I think I used 4mm in the end.

I use this in my wife's potting shed connected to a Bluetooth receiver (arcam) on one end and outdoor garden speakers on the other. Remarkable piece of kit.....tiny but sounds pretty damn good. Power limited but then I don't want more for what I am using it.

I can't really fault this. I thought it'd probably be too cheap to be good, but it's fine. I've wired in some old speakers someone gave me that used to be part of their surround sound setup, and it is such an improvement over the budget computer speakers (with amp, 3.5mm jack, etc.) that were plugged in before.It's a bit odd the way the volume works. I seem to get very small increments as it goes up until it gets to the top end, when slight changes increase the volume more. It's also not all that loud, but it might depend on what speakers you have plugged into it, and how loud your source is.Overall, it does the job fine for me for listening to music off the Internet via a tablet (terrible phone signals in my house but wifi is fine..weirdly) without the tinny built in speaker or the budget computer speakers I was using before, and it was cheaper than a decent bluetooth speaker.