- This special purchase Lepai Tripath-based mini audio amplifier is ideal for both home and car audio applications.
- The TA2020 is a 20W/ch continuous average two-channel Class-T Digital Audio Power Amplifier IC using Tripath's proprietary technology.
There is an actual power switch instead of a pot-based switch as on similar models previously offered by Sonic. There are also Bass and Treble controls, which can be quite handy in tailoring the sound a bit to the speakers and space.
I am using these for small PA applications and for desktop computer sound. I have plans to create a small guitar amp setup as well. I have used 6 of these in my "day job" and was so impressed I started buying them for home.
I have driven spot monitors like Carvin PM5-Bs and even JBL 10 inch 3-way studio monitors with these and similar amps, and they work very well, especially for small areas. One of these and a pair of Carvin monitors make for some pretty great desktop computer sound. (Until your cubicle neighbors complain, anyway.)
I haven't done any actual power measurements, but they are claimed to put out 20-25 watts per channel into 4 ohms, and my ears agree that those figures are probably accurate. I have only run them at 8 ohms, and have been pleased with the sound. I currently use one of these and JBL 10 inch 3-way studio monitors to provide computer sound for a 42 person classroom, and the sound is pretty amazing for a $20 dollar amp.
If you are looking for a small power amp that is light weight, takes up very little space, and sounds really good, look no further. Give these a try, I think you'll be impressed, too.
Oh, Parts Express is also great to do business with.
UPDATE: August 2011
In the interest of clarifying the power output capability of this amp (which has caused some contention see comments), I am re-producing the stats for the TA2020-20 chip from Lepai's own spec sheet, which is freely available on the web.
"The TA2020-020 is a 20W (4ohm) continuous average per channel Class-T Digital Audio Power Amplifier IC
using Tripath's proprietary Digital Power Processing (DPPTM) technology. Class-T amplifiers offer both the
audio fidelity of Class-AB and the power efficiency of Class-D amplifiers."
"Class-T architecture
Single Supply Operation
"Audiophile" Quality Sound
0.03% THD+N @ 10W 4ohm
0.1% THD+N @12W 4ohm
0.18% IHF-IM @ 1W 4ohm
High Power
25W @ 4ohm, 10% THD+N, VDD=14.6V
22W @ 4ohm, 10% THD+N, VDD=13.5V
13W @ 8ohm, 10% THD+N, VDD=13.5V
High Efficiency
88% @ 12W 8ohm
81% @ 20W 4ohm
Dynamic Range = 99dB
Mute and Sleep inputs
Turn-on & turn-off pop suppression
Over-current protection
Over-temperature protection
Bridged outputs
32-pin SSIP package"
"APPLICATIONS
DVD Players
Mini/Micro Component Systems
Computer / PC Multimedia
Cable Set-Top Products
Televisions
Battery Powered Systems"
The diagram with power to distortion curves is even more instructive, and I will try and add a jpeg of that so people can judge for themselves if Lepai is lying about the specs.
Are they fudging a bit calling this a 20 watt per channel amp? You could certainly make that case, given that they are quoting those specs at 4 ohms and 10 percent distortion, which is more distortion than most people would find acceptable in an audiophile application. Is Lepai pushing it a bit? Yes, but no more so than most consumer amp companies, or virtually ALL computer speaker makers, none of whom quote accurate specs for their systems.
I have been told by tech support for a well-known, widely sold PA amp manufacturer that they considerably over-spec their amps their 120 watt amp can only be driven to 80 watts; if you go beyond that they WILL fail (which ours had done). Yet, they still sell the amp as a 120 watt amp and no one sues them. Lepai is not fudging anywhere near that badly, and they publish the actual specs for all to see. Carvin is the only company I have found to be truly honest about amp specs (although there may be others). Lepai at least gives one the specs so one can see how much they are fudging.
Are there applications where 10 percent distortion IS acceptable? Certainly. Some small PA and background ambient systems would be fine with that level. Obviously, listening to pristine recordings of orchestral music would NOT. A great deal depends on program material, speaker quality, and application. For most applications, 10 percent is not acceptable.
Again, I run these amps at 8 ohms through efficient speakers (Carvin PM-5B and JBL studio monitors), and find them to be very good performers FOR THE PRICE. I would not recommend running them into 4 ohms, unless you intend to keep the power level down.
At 8 ohms, per their device curves, you can hit 10 watts per channel and stay near or under 1 percent distortion which is the definition of "High Fidelity" by international standards, and beyond which the normal human ear cannot discern any further lowering of distortion, according to some. At 4 ohms, you can get close to 18 watts per channel and still remain under 1 percent. Is it fudging to call an amp that produces 18 watts per channel at 1 percent distortion a "20 watt amp?" Not by much, and certainly not by the usual standards of most manufacturers. NOTE that with the stock power supply, 12 volts at 2 amps, you could not possibly get more than 12 watts per channel, if it were a perfect world (which it is not). A beefier supply would be required to get closer to those rated specs for the chip in this amp. Personally, I would call this a 10 watt amp, not 20. More and more vendors are adding the channel outputs together, rather than giving the per channel output, which has been standard practice in the stereo world.
Even so, I find these to be very useful little amps, and will continue to buy and use them as long as they are available. If you cannot afford the rather modest price to find out, then don't risk your money. If you want a good performing amp for the price of a few lattes, then go for it. I think you will be happy with these. If you are looking for an amp for your Home Entertainment system, I think you will want something with a lot more power. These are small amps for small jobs.
Also, if you have a power supply failure, which I did have with one of these amps, Parts Express has very good replacements for a very good price. Parts Express is a very good vendor, and I have bought from them for many years. I bought all 7 of the amps I have used from Parts Express.
Still highly recommended.
Buy LP-2020A+ Lepai Tripath Class-T Hi-Fi Audio Mini Amplifier Now
Currently running Pandora via Netflix, through this box, into old Dalhquist speakers.Sound is simply astonishing. No distortion, strong warm base, a little muddled in the middle (but hey, it cost less than $20 on Amazon), runs cool, very loud at 1/4 volume.
I'm a techie, having build many amps over the past 30 years, including tube amps (Dynaco 70).
There are plenty of amps that cost 10x this, which don't come close in terms of sound quality.
This is my first review.
Read Best Reviews of LP-2020A+ Lepai Tripath Class-T Hi-Fi Audio Mini Amplifier Here
The outside quality is adequate. The sound is full and balanced with a wide range. I didn't expect that the lows could be so strong and deep from such a tiny closed aluminum box (still cool with running for a long time, say one hour from my impression) costing only about $25 with shipping and handling charges. It's a miracle! When the volume is up to 2/3, there is still no discernable distortion. The 3.5mm input jack is extremely convenient for you to connect almost every audio source.The only weakness to date is that there is a noise (not big though) when I shut down the power, even if I turn down the volume to zero.
In a word, this product is almost perfect for its purpose, especially when you take its size and price into account. If you need a simple and compact stereo, buy it ASAP, since the price could go up soon, and since you'll be most likely impressed.
Want LP-2020A+ Lepai Tripath Class-T Hi-Fi Audio Mini Amplifier Discount?
For the first couple of weeks, I hated this amp. Connected to my Denon speakers, it has terrific sound, and seems well built, but it had this nasty buzzing sound that drove me up the wall whenever the amp was on but nothing was playing loud enough to drown out the buzz. If you read the reviews on this amp, many, many people complain that there is no power adapter included. Then, you will find some comments that they are including a Vonage power adapter with it now. You will also find some complaints about an annoying buzzing sound. Well, my friends, the buzzing noise comes from that Vonage power adapter. If you provide your own 12v power supply, it works great and has very clean sound. I thought about returning this unit, but I can't get anything comparable for even twice the price, and 12v adapters just aren't very expensive. In my case, I had one just sitting around, and was delighted with the result. The amp is a keeper, the Vonage power supply is a tosser.Save 27% off
This is a clean sounding amplifier with only the controls one really needs. So its great for my parents who don't have the frame of mind to fiddle with too many controls. However, be aware of power supply issues.1) I bought two of these at different times from Amazon. Both did not ship with power supply even though they claimed to include them. Amazon has not corrected the product description even after I told them about it.
2) The shipped power supplies were to be a 2 amp one and a 6 amp one in the second case.
3) If you run this amplifier from a 2 amp power supply here is some news for you. The theoretical max watts your system can deliver would be 12X2 = 24 watts However, since the amp is running around 80% efficiency you can get approx 24X0.8 = 18 watts max from this amplifier (best case scenario) or around 9 watts per channel. The problem comes as you drive the amplifier harder. The power supply voltages will start dipping, and as it does so, the amplifier will distort. So your clean sounding amplifier, won't sound so clean after all once you drive it past 7 8 watts.
4) To really use this amplifier with low distortion at high volumes, you should use a switching powersupply that delivers 12 to 13.5 volts at 4 amperes. 6 amps is a bit of an overkill, but recommended if you will be using 4 ohm speakers.
5) You cannot use this amplifer with an un-regulated transformer type powersupply rated at 12 volt. Their no-load voltage can be anywhere from 15 20 volt and can even be dangerous if connected to this amp since the supply capacitor is rated at 16 volt.
6) Don't forget the log relationship between perceived loudness and watts a 100 watt amplifier is only double the loudness of a 10 watt amplifier. So this amplifer does fine to fill up a room with sound using reasonably high efficiency speakers (I am using Bose 301's). Just don't expect to pump your subwoofer with it!
7) There are two LED's inside. Not sure why only one of them lights up (in both the amplifiers I purchased).
8) Its tone control implementation can do with a bit of improvement.
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