Mini Keg Mp3 Player





Introduction: Mini Keg Mp3 Player

The Mini Keg Mp3 player is a great way to show off at the beach or a party. Costs about $60 to $80 and simple to make.

Step 1: Parts You Will Need

Class T- mini amp
12v rechargeable sealed lead acid battery
(1) Aux cable
(1) Aux cable extender
(2) bolts (any length you want)
(4) Nuts
(5) small screws
(6) medium drywall screws
(4) female spade clips
(1) 9" car radio back strap
(1) 6 1/2" MDF speaker ring (any wood ring will do)
(2) 6" or 6 1/2" MDF scraps to mount your items. (or your chose of wood)
(1) 6 1/2" Car Speaker
and of course the Mini Keg but this could work with any body style you wish.

Step 2: Prep the Keg

Once the mini keg is empty, drill a few holes on the face to make sure the air pressure is out of it. Then cut the face, making sure you have at least 1/4" of lip left over. Be careful with the sharp edges when you wash the inside and outside very thoroughly with soap and water. I used electrical tape to cover the edges while I worked on the inside so I don't hurt myself. Don't forget to take it off when you are about to close the boom box.

Trace the speaker on your MDF wood to make a speaker ring and give it a 1/4" to 1/2" thickness, this will keep the speaker in place. I used a plunge router drill to make the exact ring I wanted but it does not have to be perfect, it will not be visible.

I roughly sanded and added super glue on the ring and the keg 1/4" lip that we left for added support.

Put your speaker on and drill out the screw holes before hand because the MDF will crack if you add the screws with no pilot holes.

Step 3: The Amp

As a tech, I learned very many times that you must check all your components before the install.

Plug your Amp to the speaker of your choice and the battery. I used the Dayton Audio Class T DTA-2 for a few reasons.

1: It has a separate volume knob.

2: You can choose from two different power source plugs.

3: It is a build it yourself amp and this was a great way to teach my daughter about building electrical components from scratch and how to solder them.

The Dayton Audio amp has instructions on how to plug everything up, and it comes with all the wires you need except the Aux cable. This amp is 81% efficient at 15w, 4omhs or 90% efficient at 10w, 8ohms so choose your speakers wisely. I used a Memphis audio 6 1/2" 2 way speaker I had laying around.

Play some music and make sure everything works the way you want it. This is the time to make adjustments.

Once everything is working the way you want it, unplug everything and set it aside.

Step 4: Mount the Battery

Make the Battery mount. You don't want this thing sliding around (its not light).

For my battery, I went with the power king 12v 5ah rechargeable sealed lead acid battery. This should give you sufficient amount of playing time. For $24 it comes with the charger.

Now use one of the MDF scraps for the base, you can use any piece of wood but I had this laying around after I made my speaker ring. Fold the radio back strap to the shape of your battery and screw it down. They are all different shapes and sizes so make sure it fits before you buy one. Measure twice cut once, right?

I left the front open so I can remove the battery whenever I need to, you don't have to worry about the front because the keg will be tilted back a little anyway.

NOTE: when the battery gets installed, make sure that the power leads are facing the speaker not the rear. (very important)

Step 5: Drill Time

Drill out the Aux port hole, the volume knob port, and the power light port.

When you drill make sure and use a light touch because the aluminum is very easily bendable, don't push too hard. Also, when you are done drilling out the power light hole, put the speaker on and make sure it clears correctly. You don't want to add the speaker and rip out the light after all your hard work.

Step 6: Mount the Amp and Wire It Up

Next mount the amp to the second MDF scrap wood. I cut a groove for the power cable but only because I got a new Dremel and wanted to try it out. You don't have to do that if you don't want to.

The Amp is sensitive and does not sit flat, so be careful when you screw it onto the wood piece.

Next add the female spades to the wire tips and plug everything in. Make sure everything still works. You can remove the ground cable from the battery so you don't short anything out and plug it in last.

Step 7: Install the Parts

Add the Volume knob and the Aux cable extension. For a more manageable wiring layout, zip tie the excess wires to the appropriate length but not necessary.

For the legs, use the 2 bolts and 4 nuts. One nut on the inside and one nut on the outside of the keg wall. Same for other leg. I just guessed about 1 1/2" to 2" apart from the bottom crease and drilled holes in and added them. In hindsight, I would have placed them a little closer in towards the crease.

Add superglue to the edges of the MDF wood and add the battery on the lower tier.

Then plug the Aux extension and add superglue to the Amp's MDF wood edges and place above the battery. Make sure and keep the speaker plugs where you can get to them to plug to the speaker.

Forgive the clutter, I got excited and shoved everything in without laying out my wires properly. I'll most likely go back and fix this at a later time.

If you unplugged the ground wire, make sure and re-connect it at this time. Double check everything is in working order at this point.

Step 8: Add the Speaker

Finally, plug in and add the speaker.

Some speakers come with covers and some don't. For mine, I had to add the speaker then add the cover and screw both down at the same time. Also some speakers use different amounts of screws, mine used 6. For speaker mounting to MDF wood, I always use drywall screws. Use your judgment on which ones work better with the wood you are using.

Step 9: Play and Enjoy

Plug the aux cable to your mp3 player and you are done!! Enjoy and show off to your friends.

"Build your own dreams, or someone else will hire you to build theirs." -Farrah Gray



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well you have to use the power specs of the amp you choose.

wait what is the wattage and ohms of the speaker ? if you use lot of wattage and and ohms in the speaker driver the ic will heat up and destroy !!!1! dont put a 9watt or 6 watts speaker in the speaker will the thing wil do the job

The watts and ohms you need will be dependent on your amp choice. Your speaker needs to be higher watt rating than your amp, it can be much higher, even 200w would be fine. Now if the ohm load is too much (numerically lower) then yes you will cause overheating and/or damage to the amp. Chances are you will meed a 4/6/8 ohm speaker rated at least 15w but preferably 25w+ a 4 ohm speaker will put twice as much load on the amp as the 8 ohm speaker would, but either would be fine as long as the amp is 4ohm stable. Also most amps put out the most wattage at the greatest load.

but kind of the ohms is the resistance of the speaker driver but hi watts will create a heat in the amp and lot of consumption of the amp in the dc volts and will create a fast low of charging as it is if you make one make hi input of load in caps so if you put the 1000 go up caps the result will fascinating the the amp will go crunk up and try to be headbang and and yeah true to that but if you make one with real system driver i mean true part and true schematic maybe will experience with what im saying with it and try i lm386 with make it stereo pls let you see what i mean bro....

actually i live in india and there is no good electronic shop around...

subtitute thats solution

and why seal lead acid if you can use li pol or li ion batt it will do save space and can do portable its dasame !!!!! just dont forget the volt rate

li pol batteries were out of my price range. I also read reviews on some and they were having overheating issues. the keg will be a little heavier but I wony really be lugging it around for too long. it will mostly stay in one place when its in use.

and will do the weight will decrease to and will do can carry it in anyway you want!!!!

I'm guessing you did this to find a purpose for a single speaker, otherwise why didnt you put the other speaker on the other end

2 replies

2 speakers facing opposite directions win the same airspace will cause some soundwaves to cancel eachother out and sound out of phase.

Although if you reverse the polarity of one of the speakers, they will play in harmony.


Hello there, been looking at a similar project myself except using a single 6x9 speaker in some sort of box. Could you tell me where you got your mini amp please? I've been looking online but keep coming back to car amps. Also, how do you charge your battery? With a motorbike charger or something? Good build, cheers in advance

1 reply

parts express for the amp, battery and charger came together from amazon.

Stealing from Bby install bay

great project. finally something Heineken is good for ;-)

hi there i found this inside an old big "party speaker", could i use this for an amp? if so some pointers on how to wire it up would be very helpful. thanks

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2 replies

Negative. That is a high-bandpass filter, otherwise known as a "crossover". This is NOT an amplifier.

ok thanks for that. i already have an amp picked out for what i am doing. just need to purchase it.