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Lepai LP-2020A+ Tripath TA2020 Class-T Hi-Fi Audio Amplifier with Power Supply

4.1 out of 5 stars 3,673 customer reviews
| 676 answered questions

Currently unavailable.
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  • Compact size makes this amplifier great for projects and DIY audio applications
  • 3.5 mm jack allows for easy connection to iPods, cell phones, and all sorts of mp3 players
  • Aluminum enclosure that is lightweight, yet sturdy, and acts as a heat sink
  • Tripath TA2020 amplifier chip provides efficient, powerful sound
  • Economical price and tremendous performance

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WARNING:
CHOKING HAZARD -- Small parts. Not for children under 3 yrs.

Technical Details

  • Brand Name: Lepai
  • Model Number: LP-2020A+
  • Output Wattage: 20
  • Surround Sound Channel Configuration: 2
  • Color: Black

Product Description

This Lepai Tripath-based mini audio amplifier is ideal for both home and car audio applications. The amplifier's TA2020 amp chip is a 20W/ch continuous average two-channel Class-T Digital Audio Power Amplifier IC that incorporates Tripath's proprietary Digital Power Processing technology. Class-T amplifiers offer the audio fidelity of Class-AB amps combined with the power efficiency of Class-D amplifiers. The Lepai amp's clean, 20 watt output makes it perfect for most any auto or home audio project or DIY application. Google Lepai TA2020 and you'll find this little amp has been discussed and raved about! Each unit has an RCA Left and Right channel input, or you can use the 3.5 mm stereo input jack for plugging in almost any music source, such as iPods, cell phones, or MP3 players. Convenient spring terminals make connections to your speakers quick and easy! The Lepai mini amplifier has an aluminum enclosure that is lightweight, yet sturdy, and acts as a heat sink to keep the amp running cool. Color may vary.Includes 12V, 2A power supply. Specifications: Power output: 2 x 20 watts RMS ; Input impedance: 47k ohms ; Frequency response: 20 Hz - 20 kHz ; Input sensitivity: 200 mV ; Minimum THD: <0.05% ; Dimensions (D x W x H): 120 x 147 x 42 mm.The power supplies that come with the unit may vary, operating voltage is up to 14.6 V.

Product Information

Product Dimensions 4.7 x 5.8 x 1.7 inches
Item Weight 1 pounds
Shipping Weight 1.1 pounds
Manufacturer Lepai
ASIN B0049P6OTI
Item model number LP-2020A+
Customer Reviews
4.1 out of 5 stars 3,673 customer reviews

4.1 out of 5 stars
Best Sellers Rank #1 in Musical Instruments > Live Sound & Stage > Power Amplifiers
#278 in Musical Instruments > Recording Equipment
Date first available at Amazon.com October 28, 2010

Technical Specification

Warranty [pdf ]

Warranty & Support

Product Warranty: For warranty information about this product, please click here [PDF ]

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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

I have been using the Lepai amp for almost 2 years. There are good and bad things that I noticed. Below is my summary of the Lepai mini amp:

The GOOD:
1) This amp is really inexpensive. If you cannot spend more than 20 bucks then you may want to take a close look at this amp.

2) The sound quality albeit at low volume is pretty decent. This amp uses the TA2020 chip set which does offer quite low distortion at low volume.

3) The amp has tone controls so you can fiddle with the sound to some degree.

The BAD:
1) You'll be hard pressed to drive a pair of low-sensitivity or 8-Ohm speakers to decent volume with this amp. With an 8 Ohm speaker, you get clean sound to around 5 Watts only. If you crank the amp up to 10 Watts you'll already hit 10% distortion. With 4 Ohm speakers you can get up to 10 Watts per speaker. In fact, the wattage rating of this amp (2 x 20 Watts rms) is truly false. The power supply that comes with this amp gives 2 Amps at 12 Volts. At a power efficiency of 90% you'll get 2 x 10 Watts rms at the most. However, if you have some fairly small speakers then you may be fine. Otherwise, spend a little more and buy another amp.

2) This amp DOES NOT connect to many newer TVs which often no longer have analog RCA outs. Instead you'll either need to get an SPDIF-to-RCA converter or an amplifier such as the Amphony 250 or similar model that has an optical input which is compatible with TVs. My TV luckily does have RCA outs but be sure to check if your TV does.

3) The enclosure of this amp is fairly bulky and not exactly high quality. I opened up the enclosure and found that most of the interior is empty. What a waste of space!
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After reading some of the other reviews I checked the ac adapter right away. It had a label marked Lepai AC ADAPTER OUTPUT: 12V 2A. I could see that there was another label underneath, so I peeled the silver Lepai label off and the black label underneath was marked TennRich AC ADAPTER OUTPUT: 12V 1.5A. I checked the amps on the adapter and it was 1.5A. That is why the amplifier is underpowered. I posted a picture of the adapter. Right now the picture is at the end of the list of pictures. It's just bad business to falsely relabel a product! I will try and contact the company and see if they will ship me a real 2A adapter.
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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.
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This is a fine little amp for the price, but there are still quality control issues that need to be resolved; thus, buyers should be aware that getting a lemon now and then is a distinct possibility.

I have read some reviews stating that this unit was shipped without a power supply, and I've read of other QC problems. My unit is mislabeled on the back (or is wired backwards), so that the LEFT speaker channel is really the RIGHT, and vice versa. In addition, as you can see in one of my pictures, the power supply is mislabeled. Actually, the company misspelled its own name -- Asian Power DECICES Inc. instead of Asian Power DEVICES -- not a deal breaker, but a heads-up to buyers to be wary. I wonder what the Chinese expression for CAVEAT EMPTOR would be.

I bought this amp for its kitsch value, but I have to say that it is probably the best amp ever produced in this price range (small flaws aside). It pumps decent sound at reasonable volume, and the unit seldom even gets warm to the touch... certainly never hot.

Some have complained that this unit is so light that it slides around the tabletop or desktop when one tries to adjust the volume or tone... I'm not sure how that's a manufacturing issue, or how this can be considered a negative. Should the manufacturer add a steel plate to the bottom of this unit just to make it heavier so that it doesn't slide around? I merely attached four Velcro dots to the bottom and stuck it to my desk (see my pictures). Voila! Problem solved. Or, you can use the four slots in the amp's ample frame to screw it down if you're using this amp in a shop setting.

I'm running two 8-ohm two-way bookshelf speakers from this amp and I find that I get all the volume I need, with truly clean mids and highs.
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