So does the amp automatically switch inputs when AUX is plugged in?
no. you can use either/or inputs but it is not auto switched.
Date published: 2015-04-01
I own this amplifier and am wondering if I can power only a small sub with it. Ie, will it take an input from an AV receiver and be able to just power a sub? How would I wire this?
Yes, this will work. Just plug it in the input as you normally would and just plug the subwoofer into the sub output on the back.
Date published: 2015-04-08
I have an under cabinet radio, Sony #ICF-CD543RM, that has no outputs. I was wondering if I could solder wires to the speaker tabs, then run them to the amp. Would this produce too much input power? Would I blow the amp?
You'll likely overload the input stage on the Lepai if the speaker outs on the Sony are still active. You'll require a Line-output converter not unlike the AXXESS models PE also sells.
Date published: 2015-04-02
What are the indicators of a genuine Lepai LP-168HA?
The "Indicators" on the LP-168-HA are for the power ( red) and the input signal indicator ( blue).
Date published: 2015-03-18
One of your customers wrote that he upgraded the 3A adapter to a 5A and got much better sound and power. The specs say this is possible. Being a novice, what would the model number be for a compatible 5A adapter be?
The power supply below will work but the tip will have to be swapped with a 2.1mm x 5.5mm size.http://www.parts-express.com/12-vdc-5a-switching-power-supply-with-25-x-55mm-plug--120-056
Date published: 2015-03-11
I have 2 pcs 70watts speaker and 100watts car subwoofer, will this work on Lepai LP-168HA 2.1 2x40W Mini Amplifier + 1x68W Sub Output.
This requires a bit more information in order to proceed. Please contact our tech support for more help with this question, email@example.com or 800-338-0531 x1.
Date published: 2015-02-11
What would be the better ohm resistance to use with this amp? 8ohms, or 4ohms? Also I would only use one subwoofer. Do I have to bridge this amp, or just use one of the two sub outputs?
Using 4 ohm drivers will provide the most output from the amplifier. The sub output is paralleled, so you only need to use one set of terminals.
Date published: 2015-03-01
is it ok to run a left and right speaker at 4 ohms each, then two 4 ohm drivers off of the sub portion wired as 2 ohms ?
Yes that will work fine with this amplifier.
Date published: 2014-12-02
Can I run Bass Shakers (299-028) off this amp?
This depends on the shakers you plan on using. The Dayton Pucks will work well with an amp like this, but four Aura bass shakers would require a bit more "beef" in order to use them to their full potential.
Date published: 2014-12-05
What is the blue LED next to the crossover knob for? Is it an overload indicator?
It just shows low frequency activity. The brighter it is, the more output on the sub channel.
Date published: 2014-11-10
can I use a lepai 168ha 2.1 amplifier on 12v 6a - 7.5 power adapter Or I should only use a 5a adapter
Yes this will work with any 12VDC power supply that is 5A or higher.
Date published: 2015-03-01
Does this come with a power supply?
Date published: 2014-10-06
my old CSW radio died, has 2 - 2" speakers (full range?) & 1- 3" (sub?). The speakers sound great in the case. I want to convert to iPod dock. Easy to get to speaker wires. So wondering if this might be the right amp? Think spkrs are only 2W
Please contact our tech support for more help with this question, firstname.lastname@example.org or 800-338-0531 x1.
Date published: 2014-10-08
What speakers would you recommend? Tryn to make a boombox
There are literally thousands of possible options for this kind of application, so one recommendation is not possible. I would recommend checking out our Tech Talk forum for possible ideas, there are many different portable boom box builds there.
Date published: 2014-09-11
I would like this to power 1 6.5 inch bazooka tube in my car for a little added bottom end. its a 100 watt 6.5 sub. and will run on 12 v. will this work in a car audio application. and can i use hi power inputs or do i need a high input to RCA boc.
This will work fine with a 12VDC power source but it will require a line level (RCA) type input.
Date published: 2014-09-02
Can i install this in my car? Most cars have 12.5 volts with the engine off and 14.5 volts with the engine on. Will I run into any problems?
Yes this will function perfectly fine in a vehicle.
Date published: 2014-09-03
do you have eny mini amps like this for desktop type?
This and all other Lepai and small Dayton brand amplifiers are designed for desktop use. It resembles a car amplifier, but it is not one.
Date published: 2013-12-19
Concerning LP-168HA amp (20x20w +78w sub out) Can I use a laptop power supply rated at 15 watts and 5 amps?
As long as the power supply falls within the voltage range of this amplifier it will work. There will likely be no noticeable difference in output between a 4A and 5A power supply.
Date published: 2013-12-04
Max line level input signal for RCA channels for this amp?
What is the max line level input signal voltage for this amplifier for each RCA input? Im running each RCA input with 1.2V off my macbook pro's 3.5 mm output jack (Macbook is the Pre Amp). If I get a line driver and boost the signal to say 4V per channel should this help with getting the amps temps down by using less gain on the amps? Im also using 15V 8A switching regulated power supplies for each amp and both amps are seeing 8ohm loads on all outputs. I have an SMD DD1 to check for distortion and the line driver I'm thinking of using has a Signal to Noise Ratio of 96 which is good, and is capable of 10V per channel. Sorry for the long post just want to get as much info as possible out there for my set up, so I don't damage the amps with to high of an input voltage. Thanks for the help.
I would not exceed 2 volts/ channel input signal and 1 power supply per amp.
Date published: 2013-10-14
How to Connect to a powered sub with Sub-Out
I'm wondering how I can connect this amp with the sub-output to a powered subwoofer, specifically the Dayton Audio SUB-800 8"The sub has high level in and outs but I want to make use of this amp's sub out. I'm assuming I need to wire from the amp to the line-level inputs on the sub.
Simply go to high level inputs on your sub woofer.
Date published: 2013-10-09
will this have the full 40W and 68W at any ohm load
No. The chips used in this amp are incapable of putting out that sort of power, regardless of what power supply you are using. That is not to say this amp is unusable, or even that it isn't good. It may be great for specific applications, but it is not the sort of powerhouse that the specs claim.The satellite channels use a TDA7266S chip which realistically may put out at 6 watts @ 8 ohms, 12 watts@ 4 ohms, and maybe (a very ragged) 18 watts @ 2 ohms each. The sub channel uses a TDA7256 chip which with 14.4 volts input (the max) is reported to output 22 watts @ 4 ohms and 30 watts @ 2 ohms.Note: With 2 ohm loads all around you would be looking at a total of 66 watts. Considering that this is A/B topology, you would need to supply over twice that amount of power to cover efficiency losses. So, you might be able to get the full 66 watts of output with a 14.4 volt 10 amp power supply. However this would be absolutely pushing the limits of this amp, and sound quality would suffer. Not to mention the cost of your power supply would likely exceed the cost of the amp.
Date published: 2013-11-26
How can I hook this up to 12v sealed lead acid battery?
Can someone please explain to me how I could hook this up to a 12v sla battery? I want to use this in a portable application, but am unsure how to hook it up to the battery. Thanks
You will have to use a DC plug in order to wire this to an SLA battery.
Date published: 2013-05-22
Anybody else have issues like these?
I bought this amp about 4 months ago. It works, but turning the amp on and off causes the woofer to "suck in" and "push out" respectively, probably close to a quarter inch in either direction and on 4 and 8 ohm woofers. Inconveniently, I just don't turn it off if possible.Second, I bought 2 Bluetooth modules, 1 that I intended to use with this amp, using the USB jack for power. The modules work well when plugged into a Motorola phone charger, but when either are plugged into the charging jack on this amp there is a noise, a moderately high pitched buzzing emitted from the speakers. It does it with either module and neither module does it with the phone charger. The wired inputs work fine, just wanted Bluetooth freedom. I contemplated buying another amp just to see if this one is "defective", but they're back ordered. I really like this amp for its intended purpose, but I don't want to damage the woofer, and the buzzing is not acceptable.
That pop from the speakers is normal and shouldn't damage anything, nothing to be concerned about but I don't know what to tell you with the USB power issue. I don't use the USB port on the amp.
Date published: 2013-04-29
Still confused on how to connect sub
If you are only connecting one sub to this amp I've heard people say you are supposed to connect both + leads of the amp to the single sub + and the same with the - connections. I've heard other people say that you just hook up either the left or the right.This isn't a bridged channel is it? If so, wouldn't you hookup the + from the left channel and the - from the right?The manual of this thing is all chinese and not very helpful...
Don't be confused by the two sets of output terminals marked SUB, they are tied together, so whether you connect one set or both, the result is the same. They are not left and right outputs, just duplicate mono outputs. The only reason there are two is because it let the manufacturer get away with using existing 4-channel terminal strips, instead of putting in 1 stereo strip and one mono strip. This is handy if you are using two subwoofers though.
Date published: 2014-10-26
how do you hook up the subwoofer?
There appears to be two hookups. Im confused on how to hook up a subwoofer.
This amp consists of 3 channels or three individual power supplies. Two of them go to the left and right for the speakers. Then the third channel is split between the left and right on the sub out. So if you wanted two subs to be powered with a total of 68 watts, you could. But at the same time you can run the sub off of the left or right side and still get the same power output of 68 watts. The amp just gives you a left and right for the sub out but you don't get more than 68 watts.
Date published: 2014-07-12
Can a 15 volt 8A AC to DC switching power supply be used with this amplifier ?
I read the post about the caps exploding if they reach 16 volts and some people say 14.4 volts 5A is the max, but my amps came with 15Volt 3A. So I know 15 volts is safe but what is the effect of running it a 8A?
There really is no maximum amperage you can supply. The amp will only draw as many amps as it needs to (when it is working properly anyway).So, with your 15 volt 3 amp supply there is only 45 watts available to the amplifier. (Volts * Amps = Watts). So, no matter what, the amplifier will not be able to put out more watts than this. With a 15 volt 8 amp supply there would be 120 watts available to the amplifier. This should allow the amplifier to play at louder volumes before distorting. More noticeably it should and allow for peaks, like bass drum hits, to play louder, and sustained bass to play without "running out of gas" as quickly.Remember, the stated power output of this amp is very inflated.The satellite channels use a TDA7266S chip, which is rated at 5 watts per channel @ 11 volts input power into an 8-ohm load. Maximum output power is around 12 watts per channel with 4 ohm speakers.The sub channel uses a TDA7256 chip which with 14.4 volts input (the stated max) is reported to output 22 watts into 4 ohms.So, 120 available watts will be more than this thing will ever be able to use.
Date published: 2014-07-12
2x40watts or can I Bridge for 1x80watts?
Im using this amp for a 3 driver speaker cabinet project for a small garage gym, the 12in Sub is wired using both the amps sub outputs. Now originally the cabinets 3 way crossover( 900Hz and 2800Hz) had the sub going to it but I had to rewire it just to go to the amps sub outputs (I had no other choice). When I did this my midrange didn't work at all. After being stumped for days as to why the midrange quit working, I ran a wire from the subs + to the subs - on the 3 way crossover and now the midrange works and sounds great. So my main question is with the 2x40 watt outputs for the L or R on the amp, if I'm only using one channel will the amp sense that, and send the 80 watts to only the channel I have hooked up or will I only get the 40W still? If I only get the 40W from one channel I have hooked up, is it safe to bridge both channels to get a 1x80W channel?
The amp is stereo and non-bridgable. If you use one channel you get 40 watts and the other channel goes unused. Some amps can be bridged, And there are mono amps. Take a look through PE if this amp isn't a match for your needs.
Date published: 2014-08-31
battery power source
This may be a dumb question, but can you run this to a 9volt battery or a 12 volt lead acid battery? how long would it be able to run off of each?
You can connect it to car battery if that was the question.
Date published: 2014-07-12
truely 2 ohm stable on the stereo channels?
howdy everyone. i bought some speakers on closeout and one of these to make a portable mp3/cd boombox and was curious if the stereo output channels are really able to be stable into 2 ohms? i want to have three of the aura 6's per side so actual load would be 2.66 on paper but metered was right at 2 ohms (trio or 6.6 Ohm in parrallel). my build is a week away or so and i have time to get some answers, but the specs for this say it IS 2 ohms stable stereo but i saw no one verifying on here or asking.
Yes this will handle a 2 ohm load.
Date published: 2014-07-12
1x68Watts Sub Output
Does that mean if Im using only one 12 inch sub, and i hook it up to the amps right sub output that the sub is only getting 34 watts going to it?
The subwoofer output on this amplifier ais one single output that has two parallel connections. You can hook up one 4 ohm sub or two 8 ohm subs, either way will provide 68 watts of power.
Date published: 2013-01-03