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Lepai amplifier problems and questions.

post #1 of 4
Thread Starter 
The first Lepai lp-2020a+ amplifier that I used came from parts express and at times the left channel would cut in and out. I cut new speaker wire, made short equal length wires and made sure they were stripped properly without damaging the wire but it didn't matter. I even kept the wires the same in the amp and swapped the speakers to see if one of my speakers were defective but it was still only the left channel going out.

I returned that amp and got a second one, this time from a different seller on amazon. This amp is the opposite, the left channel is always perfect and now the right channel is having problems even though the speakers weren't rewired since using them in the last Lepai amp. Now I need to turn the volume knob up to around fifty percent for the right speaker to turn on. I can then turn it down but when I do that it cuts out sometimes. The left channel works immediately even at low volume levels and never cuts out.

I have tried using different sources such as a PC and a blu-ray player but the same thing happens. I used an old Onkyo receiver that I have and the speakers never cut out and work immediately at low volume but they sound like crap when connected to it. Is this Lepai amp just too weak to power these Pioneer SP-BS21 speakers? Any suggestions for a replacement amp? There doesn't seem to be anything in between this $25 amp and the receivers that cost $200+.
post #2 of 4
Hmmm, mine is used as a car amplifier, so I use the "volume" knob as a "gain" knob instead. How about doing that? Set your amplifier up to max clean level, and then use Windows to turn the volume up and down? You said that its not a problem above 50%.
Junkyard
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Junkyard
(18 items)
 
NAStradamous
(12 items)
 
HTPC01
(16 items)
 
CPUMotherboardGraphicsRAM
Intel i5 2320 @ 3.1GHz MSI B75MA-E33 HIS HD7970 3GB @ 1050 / 1700, 1.17v Patriot 2x4GB DDR3-1066 
Hard DriveHard DriveOptical DriveCooling
Crucial MX100 256GB WD Green 2TB DVDRW Corsair H50 Push / Pull 
CoolingOSMonitorMonitor
NZXT 120mm fans strapped to stock 7970 cooler Windows 10 Pro Dell 3007WFP Dell 2007FP 
MonitorKeyboardPowerCase
Dell 2007FP Cheap Toshiba (R.I.P. Ducky) PC Power & Cooling Silencer MKIII 950w Cheap Garbage (free) 
MouseAudio
Logitech G602 Yardsale Special 
CPUMotherboardGraphicsRAM
Intel Core i5 3330 Asus H61 MSI GTX 750Ti Low Profile 2x4GB Hynix DDR3-1333 
Hard DriveHard DriveOptical DriveCooling
60GB Kingston SSD 1TB Seagate Samsung DVDRW CoolerMaster Gemin II 
OSMonitorKeyboardPower
Windows 8.1 + Steam Big Picture / Plex HT 50" Insignia LED 1080p Logitech Rosewill Green 530w 
CaseMouseAudioOther
Silverstone HTPC Logitech Pioneer 2.0 tower speakers + 135w RMS Rosewill MCE Remote 
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post #3 of 4
I bought two of these – one for about £30 and one for about £10. They are identical so the first seller obviously made a good profit. The chip exploded in one of them but I was able to get a new chip for about £5 and with great difficulty removed the old chip and soldered in the new one. One of them developed the dreaded random cutting out a channel syndrome. On close inspection I found that one connection of the RCA connectors had broken from the PC board and was making intermittent connection. I managed to solder in a new connection but the problem persisted. A good whack on the box often restored the lost channel so obviously the problem was still mechanical. Eventually it turned out that the red RCA connector was poorly made and was making intermittent connection with the centre pin of the input cable. By trying different cables and juggling the connection until a good contact is made finally solved the problem. I still think they are good value at around £10.
post #4 of 4
i am a strong believer that if one wants to dabble in the fine area of t-amps... one should spend a bit more and get any number of decent different brands than that lepai 2020A+ which imho is built of w/ very dubious quality / qc

now many get the lepai's and theirs work great good on them but too many of these things are just borked out of the gate.


My own T-amp is a SMSL SA-S3 i have owned for 2~yrs now it has worked very well from the get go no channel imbalance to speak of and it came with a high quality 4A power supply (the lepai comes with a rather anemic 2A psu that should be replaced for better performance).


my SA-S3 was $60~ shipped from ebay

other good (and possibly easier to acquire options Topping TP20MKII or Dayton DTA-100a

muse t-amps are reportedly pretty decent and readily available on ebay.

honestly i mainly bought the SMSL cause i thought (mho) the looks of the lepai are lacking and I greatly prefered the looks of the SMSL amp I have been very pleased with the choice to order the SMSL SA-S3.

here is mine chilling under my FiiO E07k/E09K combo





so basically blah blah blah...if possible return the lepai(s) and buy a nicer t-amp ideally, or at least that is what I would want to do.



edit... oh yeah i have had no problem driving speakers with my SA-S3 i have used it to drive Monitor Audio Silver S1's , B&W V202's , JBL L1's, polk monitor 30's ....lets see what else oh right I drove my Advent 9's with it also.
Edited by atarione - 10/13/13 at 2:24pm
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