How to create a Bookshelf Speaker Boombox
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- Опубліковано 30 вер 2024
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In this project I will show you how I turned an old bookshelf speaker into an awesome portable boombox. It features a battery run-time of 100h, a battery level indicator, USB charging ports and a 20W amp. Those features make it perfect for all outdoor trips. Let's get started!
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Music:
2011 Lookalike by Bartlebeats
Ecstatic Wave, Jens Kiilstofte
machinimasound...
"Since this one decided to not work correctly..."
*Starts melting*
Nah It’s fine it’s just some melting, shorted pins and dangerous heat
@Bodhi Bowen lol fuckin' bot
Hey! Great video, altough there are some thing I want to point out that might improve your project.
You should have left the polyfill inside, as it keeps the sound from bouncing off the walls. Also, the battery is pretty big, so adding even more polyfill will restore the speaker to it's tuning frequency and give you lower bass. You should have at least checked that the crossover filter has the same frequency as the original one. And you should absolutely make sure that the whole thing is airtight, so add some foam seals on that back door. Other ideeas might also include a bluetooth receiver or an Arduino so that you can play music from an USB drive and some volume controls. Oh, and that speaker seems underpowered, I would have used a bigger amp, especially since most amps distort really bad at max volume. Other than that, great project! I know sound quality is not the primary goal, but this are just some simple stuff you could do that help improve it.
I like recycling projects - always good to make them your own with customisations. Great build!
more like reusing.
This is I think one of my favorite projects you did...first the car radio boombox, bathroom audio and this
Really amazing work, dude! But... No bluetooth this time?
who uses that anyway
People with iphone 7 or higher...
sad, but true
You´ve forgotten also the present must have features: the unsecured WiFi with burned in streaming services and autoupdate.
Bluetooth can be hacked
Love it!
me too
Should have made a screw-on-backing plate. That way the enclosure would be properly sealed where it needs to be.
The project is awesome, but some inside mounted hinges would look better •_•
Emil Racovita or Just 3d-printed hinges
I don't get why using hinges at all if everything inside is glued with strong glue so it will break if you try to get it out, and all connections are soldered. I'm screwing everything together without any toolless "service openings" but still use plugs and also screw down the pcb's, so in case something is wrong I can take everything apart easily. Anyway a good project.
Wilson well pointed
tim
you said:
"Emil Racovita or Just 3d-printed hinges"
LOL
Sure! Let's all buy an expensive 3D printer, the pinnacle of hobby geekness, to print out something we've been making quite well for over 3500 years! Reality check: Your local hardware store has better looking hinges for a buck or two... Go ahead. Treat yourself to the real thing! ;-)
Just kidding! (...and a little jealous)
You can get a decent 3D printer for less than $200 dollars these days, it's well worth it to have one around these days if you're into projects like this! Between affordable printers and an abundance of free software and tutorials, it's never been a better time to add FDM to your arsenal.
Why not try sealing the panel opening and why not put the rockwool back in its place, at least you would have damaged less the speaker acoustics that were very carefully engineered
How do you know the original speaker was carefully designed? You have researched the specific brand and model or so? There is plenty of audio equipment that was only made to look like audio equipment, without too much engineering in the design. But yes.. Putting the rockwool back is a good idea.
he ruined the speaker. well it was never good anyways
@@legobuildingsrewiew7538 only good speakers are made by braun / ads
@@BadMax02_VR That is very much an opinion and not everyone will agree.
it's Denon, that's pretty high end kit.
What reaction had your friend when he saw you have modified the gift?
He liked it. Will be useful during the vacation.
Nice
GreatScott! tomorrow I will start making one very similar to yours
I don't think you need it because your vacation is camping
100 hours? Oh wow...
And you can charge the phone with it while you aren't using it so a very good combo.
The phone can be charged also during usage!
It is possible to charge your phone too
You can utilize the batteries to charge something such as your phone as well!
_And since no one mentioned it, you can also charge your phone while you listen!_
5:52 Ah yes, seeing the sound. Lol. :D
You can not see the moving membrane of the loudspeaker?
You should see the cone moving but much more than that.
I think he means the "UA-cam Audio Libary".
of course
Gerhard Gösebrecht das Lautsprecher ist gut
add a bluetooth module to it?
you can, but it comes down to personal preference
What about sealing the cutout with some foam because it loses sound quality without it.
Oh, you mean like the opening that is the bass port that is already on there?
@@Rudofaux no
@@Gamerdu45 Oh? Then tell me. What is the bass port if not just a tube that leads as a opening?
audiophile here: I really enjoy your videos but please, please keep the old crossover. You can't simply replace it with a different one, those crossovers are designed to match the drivers (impedance, crossover frequency, volume of the tweeter...).
Sure it will work with a different one, but the frequency response of the speaker will suffer.
thank you. i cringed so hard when he chopped the old one out.
Audiophiles are like wine experts.
@@vyladence The old was was worn out. It needed to be replaced. Heavens know how old those caps are. They're most likely leaking current. Besides, one crossover is the same as the next.
@@Rudofaux no. someone like scott could have easily replaced the capacitors. also the statement "one crossover is the same as the next" could not be *any* more wrong. It's like saying all computers are the same. That crossover had specific values and combinations of the components to correctly split the audio signal. If the values aren't the same, the separation is going to be different. then, your woofer or tweeter could be getting too much or too little signal and would be too loud or quiet. Also, the crossover point where the frequencies switch from coming out of the woofer to coming out of the tweeter could be shifted. This could lead to the tweeter trying to output frequencies lower than what it's designed to or the woofer outputting frequencies too high. this can lead to distortion or even, although unlikely, speaker damage. Nonetheless, crossovers rarely wear out. Vintage audio gear is highly sought after for a reason. I have never seen a person take high end speakers from the late 50s and replace the crossover. Why? because it's designed and tuned for that specific speaker. If they wore out, people would be replacing them all the time. This speaker, which is nowhere near that old, is going to have a crossover that works absolutely fine. rant over.
@@vyladence Never before I've seen someone use so many words to say nothing at all.
Only $2???? Why is my shipping $17
The PCBs are $2. I never said the shipping was for free.
GreatScott! HahHhHHahhahah
triggered
GreatScott! Lol haha
To be fair, Scott's shipping is free, GIMME YOUR $0 SHIPPING LOL!!!
Nice project, but you cant get 140 hrs out of it, because a 20W amplifier with 16V never can draw only 70 mA.
That what you measured, was ruffly anything of a peak voltage - The power supply just cant read the data that fast.
If you want to find out the current, get a 60 Hz sine wave and then measure the current. You will see the current at about 1 A I think.
With that calculated, you will get a battery life of approximatily 6 hrs on mid volume.
finally someone else who realized he did the test wrong.
Hey great Scott you should build a synth or some other noise making electronic device. There is lots of documentation online on synth diy projects
Yeah! Good idea. Music from outer space has many good projects you could do
Does that amplifier circuit not need a heatsink..? I guess you're not driving it to the 20W limit though, rather 1ish watts..
Skruffles yeah 70mA or what he messured well don't make sense for 20W amp 😂🤔
RadegasTCZ
Once he goes outside with it and turns it up I doubt it will last 100 hours lol more like 10 hours
I have that exact same amp, it easyl pulled 1-2A while driving 2 speaker at 18V at max-ish volume.
since it is class d it means that the effiency is pretty high and you won't really need a heatsink.
The advantage of class d amplifiers are their efficiency (full load up to 94%).
Ich weiß aus eigenen Projekten das dass es schwierig ist, einen vernünftigen und halbwegs günstigen Bluetooth Empfänger zu finden. Meine Empfehlung wäre der günstigste Empfänger von der Sure Electronics Website, kostet mit Versand einen Zehner. Kommt halt aus China und damit halt eine lange Versandzeit. Schneller und deutlich teurer geht es auf der Website vom Hobbyhifiladen. Da kommt es vielleicht noch vor dem Urlaub an. Hat nur ein extrem leises Fiepen was man bei Maximaler Lautstärke nur Wahrnehmen kann wenn es sehr Ruhig ist. Hab inzwischen Selber schon 4 Stück von denen in all meinen Bluetooth Boxen verbaut. Und als vielleicht lautere Alternative kann ich den TPA3116 nur Empfehlen. Klingt ziemlich gut, hat gut Wumms und verbraucht auch wenig Strom. Aus China für unter 5€ zu kriegen. Beides kannst du ohne Step up oder down Wandler direkt von deinem Batteriepack aus bepowern.
Grüße aus Hamburg, Moritz
Love your videos but in this case your modification has introduced air leakage gaps which degrade low frequencies one way is to seal to the the modified areas using leak proof rubber padding or to make a air tight door behind the speaker which can be locked using screws
I like recycling projects
Love your work
I think you only utilised only one channel of the amp. I.e total power is just 10w for those loud speakers. Think of changing the amp which makes it an extreme boom box with 100h of play time!!! And with extreme good quality.
Hey, nur als kleiner Hinweis, Ich denk, dass du wesentlich bessere Soundqualität herausholen könntest, wenn du die alte Frequenzweiche benutzt, da diese speziell auf den Lautsprecher abgestimmt ist.
LG David
viel bessere idee wäre es vor dem verstärker ne frequenzweiche zu machen und dann links und rechts für hoch und tieftöner zu verwenden...
DeadMowBrainstorm jain, dann muss man aber auch die pegel für hoch und tieftöner neu einstellen und bis das ganze "richtig"abgestimmt ist brauchts ne weile.... Die einfachste lösung wäre einfach die originale frequenzweiche....
hmm ja okay ich denks mir nur... aber verstehs auch nicht warum er die alte frequenzweiche einfach weghaut, immerhin hält die gute alte technik schön lange, ich hätte dort nur bedenken bei den kondensatoren aber es sieht alles noch voll in ordnung aus
mit frequenzweichen hatte ich jetzt eigentlich nicht so viel am hut, kommt davon wenn man nur ein ein-weg system baut xD
DeadMowBrainstorm ja, ich kapiers auch nicht... Und selbst wenn die kondensatoren nicht mehr gut waren, kosten neue bestimmt weniger als ne komplett neue frequenzweich... Und zu dem thema mit ein wege boxen... Da kann man mit passiven frequenzen auch noch etwas rausholen... Falls du dich auch etwas mehr mit lausprechern befassen willst kannst ja mal auf dem kanal von LeoLautsprecher vorbei schaun, falls du den noch nicht kennst
David Unseld
This exact thought came into my mind as well, when he removed the good and specifically for the speaker designed crossover...
I usually really like your videos, but you have made one big mistake with this project.
The port at the back that you removed is very important for the low end response of the speaker. the entire enclosure is designed with that port in mind. By adding a port you can have a speaker which is much smaller in size, this is why manufacturers add it. By removing the port you have completely changed the audio response for the worse.
If you as a channel are making content then I think you should explain things properly as people will end up following you and may make a similar mistake.
Your friend gave you a gift which u used to give us a gift in the form of a video. It's a gift what keeps on giving :)
great build, but passive crossovers consume power inefficiently, if you filter the signal on the low level region each channel of the amp will only amplify it's own band and all the amp power goes directly on each loudspeaker.. it's called bi-amping.
Just like you say.. You need multiple amps for that. With a passive filter you can use 1 amp and drive multiple speakers with it.
5:11 are those chips boiling the solder?
jes
yes
I think it was some residual flux left in the solder that was boiling
Ye
Self soldering components.
i wounder how the module makes 20 watts with just 70ma at 16v its just about 1 w of power consumption not 20w
it outputs 20W at 10% THD ( clipping ).
he did not do the test right. the IC is 92% effecient according to the datasheet so he was only getting about less than 1W of power from the speakers at that time.
He needs a pre amp. Phone cant output strong enought signal
Nice project, becouse if I buid it i will use goodly amplifier (on a transistor in clas AB or B)
"this particular one decided to not work correctly" *chips are foaming at the mouth*
as always, great channel, great projects and great scott
*USB SOLDERING IRON DIY OR BUY*
A idea that might fit as a arduino prodjekt is to make a arduino to a digital crossover, and using 2 digital amps (one fore the midrange and one for the tweeter).
It would also probably make the battery last longer.
No heatsink for the amp? Why not just replace the capacitors on the crossover?
"After drilling a hole , I mounted the handle; which works as an handle…."...…..sbam….laughing from 2 hours
Will you make any levitation project anytime soon . If so please make on water levitation..
I will think about it
GreatScott! Yeah it is a COOL idea, let makes it happen! Thnks for sharing
If you're interested, I have very easy-to-do ultrasonic levitaion device on my channel that is made just from arduino distance sensor
0.07 Amps on an amplifier? What the
My question is how that tiny amplifier chip can handle 20W without a heatsink. Great video as always!
It is a class D amp.
Your english is getting signifigantly better!
Was it bad then? I cannot remember him having bad English. Just the French accent, but difference is what makes the world interesting.
@@Engineer9736 *German accent
do you have link for spotwelding pen?
Great job Scott. I built something simular 2 years ago for work using water proof speakers and a Bluetooth 45x2 linear off ebay and a old broken 12.8v battery pack.
Please create a video on converting wired satellite speakers to wireless
I second this motion
I would say that original crossover was a much better unit.
by adding Bluetooth module so portable wireless boombox
.
.
.
.
Note: My English is rather bad
So im use Google Translate
Bakwas hi kar rha hai 😅😅 😂😅😅😅😅😅😅🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣
I have an amplifier IC "LM1875T" and two 5W speakers. The LM1875T can output to 20W, and clearly, I do not wish to blow out the speakers.
Is there a certain way I can configure the IC so that it is not possible to overdrive the speakers? Considering it is a bluetooth device that I am also working on, it is not critical at all to use stereo. For simplicity, I think I will just go Mono.
Funny, I actually created the exact same thing, but with both bookshelf speakers glued together and a 50+50W Stereo Bluetooth Amp. I actually used the same handle as you did (I thought that was a creative idea). And now I see your video. Great job haha
lm324n battery LED Voltmeter
whats the name of that spot welder ?
Nice Video, I like this recycling projects
You fu*ked it by removing the passive crossover (counted according to used speakers )... old doesnt mean bad in this case... you probably have no idea about theese things...
Scoot you had created door for Electronics which is not properly sealed which can result in bad or low bass problem you can use seal to prevent it
Are you sure concerning the operating period of the speaker? According to the battery's link you gave in the description, I calculated a capacity of 10000mAh at 14,8V (4x4 batteries, SAMSUNG 18650 25R). The amp's maximum power with 14,8V at 8ohm should be 2x15w. So the lifespan at full power (load is 33W or 2,3 A at 14,8V because of the amp's 90% efficency at 8 ohm, according to it's datasheet [TA2020-020]) should be at about 4,4 hours at maximum. That means about 8,3W consumption at an output of 3,75W at 8 ohm, as the chip's efficency is only at 80% at this level, according to the datasheet. This again means: A maximum of 17 h at 25% of power output (2x3,75W). And it shouldn't be really loud at this level.
A TPA3116 or TDA7492P Bluetooth amp is 12-15E on amazon.de, 2x50W. Sounds a lot better than the 2x20W boards for almost the same price and has line-in as well. Source: I tried a few of them. I recommend the ones with the CSR chipset.
For anyone attempting the project, I recommend setting up 19-24V instead, that's the optimum supply voltage for most of the boards, otherwise you only get 5-10W. Check the input capacitors, some of them are only rated for 16V.
How about a give away for me 😂
Hi Scott!! Love your videos, it would be great if you could maybe cover diy headphone amplifiers something with a good filtered power supply and good low noise circuit design
Good build.
Please consider making videos for the below mentioned DIY project.
DIY 12V DC UPS for router with 18650 cells
Completely wireless multichannel speaker for home audio 5.1 ( wire only for the power for individual speakers both satellite speaker as well as sub woofer)
ohh those eletronic items you pull out is just some random thingy you can replace with any other eletronic thingy,,,or maybe a lump off lead,,,
Does the 2nd BMS board work properly? The SMD resistors on your screenshot of the board look rather tiny, so I was wondering how large of a balancing current per cell can it can actually provide? Oh, and can it regulate the charge current somehow, like these USB/TP4056 boards? Cheers, and keep up the good work!
Damn that's a lot of batteries... I'm making a bluetooth speaker in a micro pelican case with just two 2.5" full range and a 3" passive rad, but using a 50W amp and probably just 2 or 4 18650s in 1S with a boost converter so I can just use like 3 TP4056 in series and not worry about balancing
HELLO EVERYONE.......The idea is awesome but I have some doubts regarding the sound quality which I think will surely get affected. These kinds of speakers must have a completely closed/packed cavity which is responsible for insulation. In this case, you are cutting out the box which may ruin the insulation and thus decrease the overall sound quality of the system. What if we use a seal (say a silicon ring) around the door parameter which will insulate everything again and thus increases the sound quality or I am wrong in this case?????
As I am planning on building something similar, I have a question about these amplifier boards. If, for example, the amp is 60W and is powered from 8-26V source, does that mean it will reach its maximum power only when given 26V or does that mean it can be powered within such voltage range because of an onboard voltage regulator? I'm not sure if I could power the amp with 12v and get decent results
The original Denon passive crossover was likely better matched and of better quality than the replacement. The speakers also likely would have benefited from a bigger amp. Many people think a bigger amp just means louder, but it gives the speakers more power to extend to those deep notes especially.
An interesting demo is to take a subwoofer and connect it to an amp and play at a given db input level and frequency and record the output. Then, swap amps with same type with much larger input and repeat. You'll notice that while the basic settings are the same, when hitting those hard to reach (high excursion) bass notes, the higher wattage amp will always output higher db around those areas even with basic volumes and such set the same.
I relate this to climbing hills in vehicles. A smaller engine can go the speed limit, but when facing a steeper hill, it may have to downshift or may struggle more to keep up to speed where a larger (or forced air induction) engine handles the load easier.
It's a great project but it would be even better if you:
1_Paint the hinges and the charging port black
2_Swap the battery indicator's LEDs with a 6 segment LED bargraph
3_Add a bluetooth module
I have to register a protest. At 6:00 your lab supply shows 16.8V with 0.069A for a 1.14W consumption. Unless you hid a nuclear generator some place, that is a LOT short of 20 watts. Even a perfect amplifier cannot output more energy than you put into it.
Great job but I'm sad to see that a Denon speaker was used for this project... One other thing that I would like to mention also is.... Why use another passive xover??? You could have reverse engineered the original xover in spice to find out what the xover frequency is if you couldn't get that information from the web... Then using a low pass filter (resistor / capacitor) and high pass filter (capacitor/resistor) on the two respective amplifier inputs and you will have active xover which will provide much much better sound quality. A potentiometer on the tweeter channel to provide some level matching capabilities and you are done.... Active xover will perform much better than passive xover on any given day... Once again thanks for another great video...
Battery Monitor Circuit With lm3914n
lm324n
No bluetooth? I would recomend a TPA3116 or similar as an amplifier, you can even find them with bluetooth in the same board, so you can avoid parasitic currents making funny noises through the speakers. . Love the bookshelf though.
DIY 12/24V (dc) to 120/240V AC inverter? DIY or Buy? Are those Aliexpress/Banggood cheap 1000W inverters safe/clean? Would be a great vid thanks!
How are you charging the Battery pack? I also built myself a diy boombox with a 2S2P Li-ion battery pack with integrated bms and balancing but i cant find any 7.4V or 11.1V charger without Balancing
0:42 I guess I'll see if you reused your battery level circuit... 5:35 Yes you did!
Originally, 2nd order filters?
Technically, wasn't that a rasp?
Apart from maths, it's called a hyphen!
Will you make a water powered flashlight torch for me
Please
Please
Please
No
I'm thinking about making a similar boombox, but incorporating two columns, 40/80w each and I'm having a hard time choosing an appropriate amplifier, taking into account that I want to power it from 12 volt source while keeping things from burning/blowing up
Wuaaa TESLA electrolytic capacitors in a german loudspeaker :-) needs tp be from eastern Germany ;-)
My question is about that IC TPA3100D2, because is a class D power amplifier and it doesn't need a LC filter at the output??. Nice video!!
what would you say?
some people only charge their electric car around 80% and never discharg them all the way.
but what would you recoment? If you want good performance out of the batterie and still get a decent shelf life?
is it like never under 20 % and if possible not over 90 % so you only utilise 70% of the full capacity?
Hi Great scott. i have a doubt about your diy arduino ir remote.in that video you used an arduino pro mini.you proved that the circuit only consume 1 micro ampere at 3v.
I made this circuit using a stand alone atmega328-pu.the remote is working well.it consumes 1.2ma current @ 3v.the ir led is working even i didn't press the wake up button.please tell me how can i reduce the current consuption of atmega328-pu(stand alone).please respond.
will you give me your wattsapp number please.
I think you did a wonderful job on that. In the interest of keeping the size down, I use a monophonic set up with the whole cabinet, devoted to a single isobaric set up with double woofers bolted face to face, wired out of phase, in a half size cabinet.
| i don't get it, it's upsetting me... why for the love of all that is holy would you throw out the original crossover filters? The originals seem like L3 and what you put in was most definitely L2 ones... they were designed specifically for the speaker and thoroughly measured in a lab probably... that speaker looks like a quality one... replacing the filter with a generic one doesn't improve much, plus the cut off frequencies might be way off and so the overall sound might get way worse. What i would have done, and is much better IMO, is just to replace those capacitors, the coils and resistors will still be the same in 1000 years from now. I have some Grundig and Telefunken speakers from the 70's and they're still running 4-6 hours a day beautifully with their original filters, not even the caps replaced in them.
isn´t the math a little of ? 0.07 A of draw on 14 volt means around 1 Watt
the way i see it, if you want 20 Watt constant you will need to provide 1.7 A and that means with 10 Ah you will have 6h of playtime.
and the box says it can handle around 50 watt constant, so in this case it would be empty after a good 2.5 hours.
I'm just thinking about to create a project like this, but using a MP3 module with Bluetooth and radio, and an stereo amplifier (of course with two boxes).
its a great build but a shame about so much gluing of components / pcbs - what if something needs repair?
100 HOURS @20W mean that a portable SUBWOOFER (would be a great idea) would only be working for about 3 hours 7 minutes and 30 seconds when paired with my 640 watt amp lol
When I was a child with my cousin-brother we researched in books (at that time there was no Internet in our homes 90-92, most of them were translated from another languages like french and german to spanish) how to do these kinds of projects, many times it was very frustrating since the necessary materials did not exist, and almost always we used what we had within reach in our house, it was very rewarding to be able to do something with so little and limited things that we had within reach, I learned to investigate and to remain "creative" as you say, I wish I could see these videos again with my cousin, but it's been many years since I did not talk or know anything about him, your videos bring me very good memories and I thank you very much, congratulations for your effort and work.
Very good song, here is the link if someone wants to download it: ua-cam.com/video/eXbUKiaIVwE/v-deo.html
You REALLY should have kept the old crossover. It was designed to work with these speakers in that specific enclosure. There is literally no good reason to replace it with a cheap general-purpose crossover like you did.
I have a subwoofer speaker of 6 ohm . How can i make an amplifier for that to plug directly in to my audio input ? I want to play the Subwoofer Seperatly without adding tweeters .please help.please. :(
I still prefer to find an old audio equipment and turn it into a more modern one, but only by adding features like Bluetooth ;). I'd find some old amp for it instead than spend many Euros on a new equipment and create more e-waste on the way ;). But hey, that's me :D.
I think, the speakers are underpowered way to much. They are 50W sine. The amp is 20W RMS you could get much more out of it with a more powerful amp. But still this was a great project!
Good idea on paper. If you had only taken the time to put the electronics into a small project box. All that wasted space inside the speaker housing is the resonance chamber, and is necessary for a rich sound and deep bass notes. . Its size and shape were designed for the best sound performance possible. Still a very interesting design idea, and I'm sure as a mono system, it's good enough.
1:50 Oh great engineering from Denon with all of the inductors in the same axis...
Where do you get the handles from? All I can find when I search is stuff that's meant to be riveted to a boat or cabinet handles, which I dont trust to be load bearing.
I'm looking for something to put onto a small computer case, so probably a bit heavier than this.
shouldn't you use a flexible glue (like hot glue) instead of epoxy? The vibration of the speakers could shake your wires and break your solder after some years of use...
I used to solder cables to switches as well but I realized it's a lot more Handy to use crimped Plugs with Silikon insulation covers - just a recommendation ;)
I hate to be critical, but you should have cut the MDF 20mm wider on top/bottom then used a router on the box to machine out 10mm (half way through) all around.. that way the door overlaps the box, so you can still maintain a proper seal.
You should hire someone, to reproduce a few units, and start your own store, for people wanting to buy these things.
It could give you some additional revenue, on top of what you get from YuTuBe!
Great video, but the end is kind of useless because of the audio codec UA-cam uses, 128kb/s mp3, put differentely UA-cam audio sucks
14 Volts by 70 Milliamperes doesn’t sound like 20 Watts of Output power. More like one Watt of Input power 🤔
Please help, I just received my BMS from ebay but it didn’t come with any wiring instruction, can you help?
You won't belive , but i thought of a speaker type project after looking at the picture on facebook, because there was some kind of round hole in the top part of the box, and there was also an aux cable....
This speaker is design for post-apocalyptic scenario. Where you just want to enjoy music as the world tumbles to oblivion.