Lepai LP-2020A+ Tripath Class-T Hi-Fi Audio Mini Amplifier without Power Supply

Brand:| Model: LP-2020A+
This Parts Express Lepai Tripath-based Class-T mini audio amplifier's small size and clean 20 watt output make it perfect for almost any auto or home audio project or DIY application where space is limited. Power supply not included.
  • Tripath TA2020 amplifier chip provides efficient, powerful sound
  • Economical price and tremendous performer
  • Compact size makes this amplifier great for projects and DIY audio applications
  • Aluminum enclosure that is lightweight, yet sturdy, and acts as a heat sink
  • 3.5 mm jack allows for easy connection to iPods, cell phones, and all sorts of MP3 players
Part # 
Weight: 0.75 lbs.  
List Price$29.99
Regular Price$25.98
You Save23%
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Part # 310-301
Qty:  EA
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Product Details

Lepai LP-2020A+ Tripath Class-T Hi-Fi Audio Mini Amplifier without Power Supply

This special purchase Lepai Tripath-based mini audio amplifier is ideal for both home and car audio applications. The amplifier's TA-2020 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 LP-2020A+" 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.

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% • Required power supply (not included): 12 VDC 2A (2.5 mm x 5.5 mm plug, center positive) • Dimensions (D x W x H): 120 x 147 x 42 mm.

Product Specifications
  • Special FeaturesClass T
Lepai LP-2020A+ Tripath Class-T Hi-Fi Audio Mini Amplifier without Power Supply
  • BrandLepai
  • ModelLP-2020A+
  • Part Number310-301
  • UPC848864000770
  • Product CategoryHome Audio Amplifiers
  • Unit of MeasureEA
  • Product Rating
    (14 Reviews)
  • Weight0.75 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.

View similar products to the Lepai LP-2020A+ Tripath Class-T Hi-Fi Audio Mini Amplifier without Power Supply
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Lepai LP-2020A+ Tripath Class-T Hi-Fi Audio Mini Amplifier without Power Supply
Lepai LP-2020A+ Tripath Class-T Hi-Fi Audio Mini Amplifier without Power Supply is rated 4.4286 out of 5 by 14.
Rated 5 out of 5 by from WOWA couple of weeks ago I fixed my old SPL Speakers using 4 GRS 8PR-8 8" Poly Cone Rubber Surround Woofer running then with a 2 watt per channel muti media set up for my computer and that sounded good but just added the Lepai 2020A amp without the power supply…all I can say is WOW... bought the 5A power supply for $16.00…and this thing cranks out the SLP volumes….get this little work horse you will not be disappointed....this amp sounds great to me but the next door neighbor not so much...LOL
Date published: 2013-10-11
Rated 4 out of 5 by from This little puppy rocks!Like most everyone here, I too am quite impressed with the output (read sound quality) of this little amp.That being said, and like a few people have noticed (and commented), I too find it odd that the engineers couldn't figure out a way to ensure that there's no "volume reduction" when (and if) both inputs are connected/used simultaneously. And that's probably the only reason why I gave it 4 stars (and not 5).Check out (below) some of the things I've done with this amp:http://cyrilrose.com/diy-tutorial-how-to-make-a-mini-digital-boombox-sans-speakers-for-cheap-using-a-lepai-amplifier-a-behringer-dac/http://cyrilrose.com/tutorial-how-to-setup-an-awesome-sounding-semi-portable-open-boombox-using-a-raspberry-pi-and-squeezeplug/
Date published: 2013-10-08
Rated 4 out of 5 by from Better without the stock power supplyI got the LP-2020A+ a while back with the stock 2A power supply. It sounded perfect at low volume levels, but if I cranked it up, the power supply just couldn't keep up. Distortion would set in, and if I turned it up loud enough, a big bass hit would send the power supply into overcurrent protection. I replaced the stock power supply with a 12V 3.3A power supply and all these problems went away.Even with a properly sized power supply, this amp still has some shortcomings. The volume knob on mine felt a bit rough and it produced a loud pop on the line in when turned on. I had multiple amplifiers in my system and had to make sure this amp was always turned on first and off last. I'm not sure how I would have handled this if I were using multiple LP-2020A+ amplifiers. I'll probably buy another one the next time I have a need for a small utility amplifier.
Date published: 2013-10-02
Rated 4 out of 5 by from I've used 10 or more of these, no problems at all.Great sound, quality, tone. Without the power supply (inadequate when bought with the amp) and using a 14V 3 amp or better power supply, this amp really sings! I'll keep using them until they quit making 'em.
Date published: 2013-10-02
Rated 3 out of 5 by from No power supply!!!Shame on me for not reading as this comes without a power supply. No wondr it is so cheap.
Date published: 2013-09-05
Rated 5 out of 5 by from Sweet!This lightweight amp really packs a punch and has awesome sound quality. I made a pair of mini monitors(under speaker projects)and they rock!
Date published: 2013-08-09
Rated 4 out of 5 by from Good little ampGreat amp for the price! I didn't, however realize it didn't include the power cord. Overall happy though!!!
Date published: 2013-07-25
Rated 5 out of 5 by from Get this one, not the one with adapter included!I know exactly what you're thinking. "This one doesn't come with a power supply? Why would anyone buy this instead of spending a few more dollars on the one that actually works out of the box?"I'll tell you why. Because the the power supply that comes with the other one is no good. It's a 12V 2A power supply, which means that at the very most it can draw 24 watts, which means that the most the amp can deliver is 10 watts per channel, probably closer to 8. If you're using 6 ohm speakers, you probably get 6 watts per channel, and with 4 ohm speakers, probably less than 4 watts. This makes clipping incredibly easy. It will distort at pretty much any volume above 3.The amp is designed to take 5 amps, so buy this one and then spend ten dollars on a 12V 5A power supply. This will allow the device to deliver the full 20 watts per channel as advertised, and will reduce clipping and distortion. You'll end up spending a little bit more, but a good power supply basically supercharges this amp.
Date published: 2013-04-11

Product Q&A

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Lepai LP-2020A+ Tripath Class-T Hi-Fi Audio Mini Amplifier without Power Supply

If I use 3.5 mm stereo input, and hook up only one speaker will it get all of the sound or just the right or left signal?

Asked by: bvdhvy
You will only get the left or right signal out depending on which channel you plug the speaker into.
Answered by: MattP
Date published: 2014-01-24

Would Parts Express have a cigarette car charger that can be plugged directly into this amp? If so, does anyone have the part number?

Asked by: LarsTheDrummer
We do offer a DC to DC converter which has 2 amp output capability, although you can probably just get a standard cigarette lighter plug wired to a 2.1mm x 5.5mm plug as well, since the amp accepts 12V input.http://www.parts-express.com/12v-2a-dc-to-dc-converter--265-014
Answered by: MattP
Date published: 2013-12-04

Why is this thing drawing 100 ma with no sound?

I bought a class-T because I thought it would be super efficient for my camper, which has a 12-volt system and solar charger. But it draws 100 ma on idle, music at the level I am comfortable with hardly raises it any higher. Prior to purchase I viewed a video on class-T and it hardly moved the ammeter with no sound out. Problem? It works fine, sounds good, burns 1.2 watts doing NOTHING!! Bluetooth input from iPhone.
Asked by: Ebasco
100mA, this "thing" needs at least 2000mA (2A) and 5000mA (5A) for full output
Answered by: speaker freack
Date published: 2014-05-02

Power Supply and Power Output

The TA2020 chip's datasheet specifies 18WPC@13.5V, and 25WPC@14.6V, with both at a high 10%THD+N.There's no mention of 12V – I'm guessing 20WPC goes heavily over 10%THD+N...Here's my question: has anyone tested a 16V PSU? Would it be stable?Thanks!
Asked by: vernich
12V 5A will give you FULL output of 20Wx2hope this helps :)
Answered by: speaker freack
Date published: 2014-05-02

12V Direct Power

Can this unit be powered directly from a 12V cigarette lighter outlet without the ac converter?
Asked by: Jim T
Yes this will work perfectly fine.
Answered by: MattP
Date published: 2014-01-24


20W at 8 or 4 ohms?
Asked by: speaker freack
This is rated at 4 ohms.
Answered by: MattP
Date published: 2013-09-13

12V Plug Details?

Can anyone please provide additional specs or requirements for the 12V plug? I am trying to buy the right one but I want to make sure it fits correctly.
Asked by: dcimco
The plug for this amplifier is 2.1mm x 5.5mm.
Answered by: MattP
Date published: 2013-08-12

How can I connect headphones to this unit?

Asked by: sidber
Unfortunately there are no previsions for connecting headphones to this amplifier.
Answered by: MattP
Date published: 2014-01-25

Are the aux and RCA jacks combined inside the amp?

That is to say, if I'm inputting something through the AUX jack, will the RCA jack then act as an output? Or vice versa? I'm wondering because it would be nice to have output to a headphone amplifier. Thanks!
Asked by:
Yes the jacks are combined.
Answered by: JDoyner
Date published: 2014-01-24

Can I run 4 of these amps simultaneously from one 12 volt 20 amp switching power supply?

I love these little amps and have used them for all kinds of applications over the past couple of years. I want to use 4 of them to control a simple 4 zone system around a large deck and pool. Running them from a single power supply vs. 4 x separate 5 amp bricks would make for a much cleaner install. I tested a couple of these on my Dayton Audio outdoor speakers and they sounded great and were more than loud enough. I want to use them to replace a Sherwood RX-5502 dual zone amplifier that recently died after 2 years of use in a hot and humid pool house in Georgia (frankly I was surprised that it lasted as long as it did since I was definitely exceeding the recommended environmental limits). The Sherwood sounded great, but I did not really use any features other than the power amp, and I was always afraid that it would be too attractive to thieves. I also did not like that I could not easily control the volume of each zone independently from the amplifier. With the Lepai amplifiers, I can bolt them down to a stud, have independent volume and power controls for each zone (for less than the price of a good external volume control!), and if one of them happens to die, I can replace just the 1 x dead amplifier for $20 rather than the entire $150 amp. Thanks!
Asked by: Ilbianco
Yes 20 amps will be plenty for four of these amplifiers. There will be no problem with this setup.
Answered by: MattP
Date published: 2013-11-08

What length does the 12vdc plug need to be?

Asked by: treebeard
The DC plug length needs to be 11mm.
Answered by: MattP
Date published: 2013-05-01

Best way to use the Lepai TA2020 for single channel use?

I want to use the Lepai TA2020, but I only need one channel. Should I use / connect just one side? Or should I conect to Positive on one channel then to negative on other channel?
Asked by: joel1316
Just use one side.
Answered by: MattP
Date published: 2014-01-24

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