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Lepai LP-2020A+ Class-T Audio Mini Amp $19.49 + FSSS

jkilez 704 January 3, 2013 at 06:02 PM in Computers (9)
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Not a powerhouse amp by any measure, but if you need a decent-sounding driver for your computer or garage speakers this guy is a bargain. Normally sells for around $25 + shipping at Parts Express [parts-express.com].

Amazon Marketplace has it for $19.49 + FSSS [amazon.com], or get it from Amazon itself for a couple dollars more.

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.

CNET has a good review [cnet.com] of the LP-2020A+. An excerpt:
The amplifier's TA2020 amp chip incorporates Tripath's proprietary Class-T Digital Power Processing technology. This chip was cited by the engineering magazine IEEE Spectrum as one of the chips that "shook the world" when it was introduced in 1998. No wonder Tripath amplifiers have earned a reputation for sound quality from budget-minded audiophiles, and the LP-2020A+'s rich tonal balance won't tarnish that impression.
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Last Edited by normalicy January 3, 2013 at 08:59 PM
Here's a video review with power measurements.

http://www.youtube.com/watch?v=7BQ2W9M4NUo

69 Comments

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#3
I like the idea of these mini amp's, but don't like the reports of poor quality, fake power ratings, lack of digital inputs... so for a budget a used non-HDMI receiver is a good deal, if you have the space.
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#4
It's been that price range on Amazon for a little while. I bought one in mid December from Amazon themselves for $20.
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#5
These are great little amps. I have this amp in my garage feeding two 8" exterior speakers. The tripath circuit is very impressive sonically, with richer frequency response than a usual op amp design. I have a Dayton 40 w version that feeds monitors in my studio. Highly recommend this lil amp, but get a better power supply 4-5v for significantly improved performance.
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#6
Picked this up for a bedroom in my vacation house. Been waiting to try this thing out. Thanks
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#7
Quote from jkilez View Post :
Not a powerhouse amp by any measure, but if you need a decent-sounding driver for your computer or garage speakers this guy is a bargain. Normally sells for around $25 + shipping at
Quote from Chip_Wrecked View Post :
These are great little amps. I have this amp in my garage feeding two 8" exterior speakers. The tripath circuit is very impressive sonically, with richer frequency response than a usual op amp design. I have a Dayton 40 w version that feeds monitors in my studio. Highly recommend this lil amp, but get a better power supply 4-5v for significantly improved performance.
Hmm, could this be what i am looking for? I picked up that Onkyo receiver a couple of weeks ago for my basement for $150 and had intended to set up two zones. Turns out the B or secondary zone needs a separate amp. I was really just going to use it to share the signal when people were in that area so I was going to just put a speaker switch for the front speakers, but I think there is a possibility of lower the sound quality of the front surround then. This might work better and just use the A/B on the receiver as intended.

Does this sound right? Any recommendation for speakers? These [amazon.com] popped up on the Amazon item page for the amp.
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#8
I'm an audio noob, but I just got one of these and installed it today. Nice little 2.1 system for my smaller apartment at around $150
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#9
can this be hooked up to marshall guitar amp lol?
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#10
Thanks OP good item to know about.
I Have one of these hooked up to my computer with a couple old optimus metal speakers. Beats the heck out of any of the computer speakers I tried.
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#11
big_wake, I'd suggest something more like these if you decide you need a separate amp. But you may want to ask a question with more detail (receiver model, speaker ohm ratings) on an audio forum.
http://www.amazon.com/AudioSource...B00026BQJ6
http://www.parts-express.com/pe/s...er=300-383

The Lepai is OK for a desktop / nearfield setup, or modest volumes in a small room. Lots of happy users.

BTW, the 12V, 2A power supply this ships with can never produce even 12W per channel (12 V x 2 A = 24W total at 100% efficiency).

10 clean watts or so is fine for a desktop setup, not meant to be a knock.

The spec sheet for the TA2020 chip is widely available. You'd need a 13.5V to 16V power supply and 4 ohm speakers to get close to 20W per channel.
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#12
Quote from buzzy View Post :
big_wake, I'd suggest something more like these if you decide you need a separate amp. But you may want to ask a question with more detail (receiver model, speaker ohm ratings) on an audio forum.
http://www.amazon.com/AudioSource...B00026BQJ6
http://www.parts-express.com/pe/s...er=300-383

The Lepai is OK for a desktop / nearfield setup, or modest volumes in a small room. Lots of happy users.

BTW, the 12V, 2A power supply this ships with can never produce even 12W per channel (12 V x 2 A = 24W total at 100% efficiency).

10 clean watts or so is fine for a desktop setup, not meant to be a knock.

The spec sheet for the TA2020 chip is widely available. You'd need a 13.5V to 16V power supply and 4 ohm speakers to get close to 20W per channel.
Thanks for the info, guess I will pass on this. I was trying not to spend too much since it would be for occasional use and not sure I even really need speakers there. Actually, I don't need speakers there, just think I probably do want them. I will probably try the speaker selector route since I can do that for not much money.
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#13
I can't vouch for the security/reliability of Alibaba (Chinese eBay), but it's consistently ~$15 there.

~$20 has been the price on Amazon for these for awhile.

As for my opinion on the product itself, I think it's a phenomenal way to spend $20 if it fits your use case. One of these, combined with some good budget speakers (e.g. if the Pioneer BS-21s or BS-41s come back in stock at Newegg for $50/$80) will easily outclass active speakers at the price point. I use the Lepai with some Pioneer FS-51s as computer speakers, and I couldn't be happier.

You'll want to keep in mind that the amp probably won't be powerful enough for more than a small room (or maybe medium if you don't need to blast them and your speakers aren't particularly low sensitivity).

Most here will be aware that Monoprice is a great place to get cheap, high-quality speaker wire.
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#14
Anybody have any thoughts on using one of these to power ceiling speakers in a bedroom?
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#15
Since it has a 12 volt input, it could also be used as a cheap car stereo amp.
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