How many of these can I stack? Need about 48 headphones to run

just use speakers

48? Are you hosting a headphone orgy or some shit? You'd need an amp for all of that, anyways. Or you could not be autistic and do this: >>57237923

>>57237923
Can't I need to feed audio to the children on my bus.

>>57237972
are there rules against using speakers?

>>57238009
Yea, some parents opted out of music for their kids.

>>57237910
The wireless headphones would be better for this job

>>57238028
Buy Earmuffs for them.

>>57237966
This. More than a couple pairs of headphones will require an amp.

>>57238073
Can I amp them up to the bus battery?

If you have 48 pairs of headphones, the volume will be divided by 48, so you will have to crank it up a lot

>>57237972
Feed them your dick instead

Are you planning on running 48 cables down the length of the bus because that sounds dangerous. Have you looked into any wireless alternatives?

your idea is overly complicated

teach the kids songs to sing

>>57237910
what in the fuck
>>57237972
ok this makes slightly more sense, but still odd and pedophily.

Anyways, there's no way to drive 48 headphones with just those. I'm trying to fathom any way of doing this that won't cost you $10,000.

I'd say if it's a specialty thing, you can probably get some custom made equipment with built in amps inline. But seeing as this >>57238028 makes me think you're doing it soon, I think you're sort of out of luck.

Of course wireless headphones would work, but you'd still need to purchase, I don't know, 30 headphones and still hook up several transmitters. You're looking at a couple grand.

>>57238089
If you go the wireless route you can also buy some battery banks. If the wireless transmitters plug straight to the wall you can get some UPSes (uninterruptible power supplies) that act as huge batteries. I think no more than 1 large one is really required. If they plug to a USB port, you can use a regular battery bank for each transmitter.

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>>57238105

>>57238114
Yea I want each seat to have 2 plugs.

I assume this is for the special kids on the bus? Just fuckin' play some music to them. They would just throw the headphones anyways; Fuckin' potatoes.

>>57238028
What music, I must ask.

>>57238231
Top 40

>>57238231
touhou music

>>57238231
Black metal

>>57238231
Eurobeat

>>57238300
>>57238343
>>57238362
>>57238374

Who the fuck do I believe...

>>57238105
That's assuming they are all the same impedance

>>57237910

You could stack as many as you want, but a passive splitter will have (i believe) about 3dB of attentuation, so the volume would be halved for each splitter in the chain until you eventually couldn't hear anything.

>>57237923

or get a powered splitter, or a mixer, etc

>>57238384
Me, I'm the real one.

>>57238409
Thanks.

>>57238384
black metal

>>57238384
Eurobeat

>>57238384
Top 40

>>57237972
Why?

>>57238231
death grips

>>57238384
Sorry I lied. It's actually Japanese Electropop

>>57238028
>parents opted out of paying for music on the bus
>so the school needs to find out how to make 48 fucking headphone jacks on the bus
>every bus
them copyrights tho

>>57238403
you mean sensitivity dumbnut

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>>57238231
>>57238300
>>57238343
>>57238362
>>57238374
>>57238384
>>57238409
>>57238423
>>57238424
>>57238430
>>57238451
>>57238473
>>57238513

>>57237910
Where do you plug these?

#stillno7plus

>>57238596
>he doesn't know why many amps have a 6 Ohm/8 Ohm selector on the back

>>57238028
Holy shit, is the school system so cucked that you need permission slips to play music? And what's wrong with earplugs?

>>57238654
Yes, in August I had to sign a contract that I will use preferred pronouns of be fired.
I don't talk to these kids, ain't worth it.

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>>57237972
do the parents kids know you're taking the kids on a bus ride?

>>57237910
Your picture wouldn't even work. That splits a combo headphone/mic jack (like on a phone or some laptops) into seperate headphone and mic ports.

Retard.

the fuck is this shit

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>>57238798
kek

this is honestly the best thread on /g/ right now

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>>57238705
>become a teacher
>realize that you hate those little shits so much that you'd rather buy 50 aux cables and set them up around the bus than talk to one of them

>>57238643
http://www.klipsch.com/education/speaker-sensitivity
http://www.audioholics.com/loudspeaker-design/loudspeaker-sensitivity
now go neck yourself

It won't work, the sound bouncing through the wire will be divided too many times to hear on the 48th set of headphones. In fact, every connection will leak some sound as it escapes the wire. Essentially the sound on the last set of headphones is O(log(n)), where n is the original volume setting. Be careful bro you don't want any kids to get hurt by the sound leaks, that shit can be deadly

>>57239251
You seem untrustworthy

if one of them fails, it might be pretty hard to figure out which one

>>57239300
not really, it and the ones past it just won't work

that said, that does make it a questionable setup. I would look into a raspberry pi radio setup and a bunch of small radios.

>>57238048

But he'll still need to know if the thing stacks for earmuffs then.

>>57238089
Yes, why not?

You should be able to find plenty of 12V headphone amps on the internet, complete or DIY circuits.

>>57237910
about 48 dongles

>>57239470
i think 36 would be enough

>>57239470
47

>>57239536
39

>>57238374
more like pedobeat, you know why I'm sayin? yeah, sure you do.

>>57239536
>>57239628
47

the autism itt

Well, there are 72 seats in this bus.
If one port is used as an extension, and one cable is used as the original plug I'll need 72*2+1 right?
So 145 total y-splitters.

I used to use RCA splitters when I was a kid to connect multiple game consoles to my TV and the quality drop was very apparent to me even as a little kid who was oblivious of so many things

Splitters are no good, come up with a different solution.

>>57238028
>48 kids

Holy shit. You guys will repopulate Australia in less than two generations.

>>57237910
The load on the amplifier will be torture for the device

Don't fucking do it

Couldn't you make this work with bluetooth and a bunch of mini receiver things?

Either way you always need extra because shit breaks and kids are kids.

>>57239844
And that's line level. The drop in volume alone from what OP is trying to do would be ridiculous.

>>57237910
>Need about 48 headphones to run off a singe aux port.

Then if you want to save some money: Learn how to solder.

You can run two amps on each side of the bus, and wire every seat with two audio jacks.
have the controller in the front right seat.

Speaker wire my man, speaker wire.

http://www.parts-express.com/pyle-pha40-4-channel-stereo-headphone-amplifier--248-4410?utm_source=google&utm_medium=cpc&utm_campaign=pla

>>57238121
>I'm trying to fathom any way of doing this that won't cost you $10,000.
stream the audio to raspberry pis, connect headphones to rpis

>>57239926
Neither is good for the device

You could only connect one Bluetooth devices to the device at one time

Just using y splitters will fuck up everything and I wouldn't be surprised if the end result is just noise

Thinking that you can connect 48 headphones(all different impedances) to one headphone jack won't have be a disaster, then you are a retard.

Plus these snot nosed cunts probably just watch leafy videos on their icancer devices.

OP should just hang himself

>>57239994
Or have them use their fucking iPhones

>>57240014
Or just let them talk to each other and bully the ones who parents wont let them listen to music

>>57240030
/thread

>>57239835
72 seats? What the fuck is this. School buses can hold like 40 if they sit almost all 3 in a seat and tour busses are like 55

>>57240094
>He didn't go to school on a double decker.

I WANT TO KNOW WHY SOME PARENTS WONT LET THEIR KIDS LISTEN TO MUSIC.

>>57240094
>Three people to a sea
The fuck?

>>57238374
>>57238430
>Eurobeat while driving a bus
That's not going to end well.

>>57240000
Okay then use one of those radio things. My bro used one to connect his phone to the car radio because it was cheap.

Output radio freq not used in the area -> kids connect on mini chinkshit radios or their phones with headphones. Drive into area with that frequency used? Just turn the dial mang..

Cheaper than setting up some amp/DAC system for 48 sets tied to one device.

>>57238374
MULTI-TRACK WHEELS ON THE BUS

>>57238705
>preferred pronouns
Ontario?

Just fucking murder queen dyke and save us all

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>>57237966
agreed
i'd seriously hate to see what would happen to the amplifier inside a mp3 player when all those kids talking outputted all that energy back into it (remember an earphone would create an ac current and op would be like 96 microphones)

>>57240126
it will turn you're gonads gay.

>>57238028

Fuck them, then. No music for anybody. If people want to start playing shitty games, they get shitty prizes. When the kids whose parents aren't sheltering shitlords go home and complain that there isn't any music on the bus, they'll go to the administration for you.

>>57240186
I think you need a license to run a radio station
Even if its small

>>57240296

You're painfully misinformed. Please google "FCC" and start from there.

When you stack shit up, you end up dividing the power of the audio output between the devices.

You could theoretically buy/diy a power amplifier and arrange the headphones to distribute the power evenly. The problem with this is if one headphone fail and you have it in series, the ones directly attached to it would cease to work. Also, you won't have any volume control but the master one.

I guess if your output signal alredy has some power to it, you can make the amplifiera with LM386's and it's configuration components.

>>57240296
10 watts is the legal limit in the usa

anything under and your fine.

>>57240376
Instead of going through all that trouble just trying to please a bunch of snot nose brats, why doesn't he just not play music

>>57238116
>your idea is overly complicated
>teach the kids songs to sing
This

>>57240442
Maybe he can use bigger speaker if he choses to play some free as in freedom songs :^)

>>57240126
MUH JESUS, MUH RADIO HAS THE DEVIL MESSAGES.

//not OP. Just guessing.

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Buy 48 of these and a couple of powered USB hubs and you're golden

>>57240590
And how do you propose the computer outputs to all of them simultaneously?

>>57240634
pulseaudio can do it with its hands tied to its back

>>57240650
In any case he would need to buy 20-50% extra of both those and the headphones because chinkshit and also because entitled children, even if this is a one time deal.

How is OP funding this and how often does he plan on using it anyway?

>>57238596
>>57239039
Both these values are important. Feel free to go take your own advice for immediately thinking you actually know everything (or anything, really). To give you an idea of how stupid you are, you are basically making a similar argument that volts is more important than amps when calculating power.

>>57238105
This is not that accurate. The power is divided by 48, assuming equal impedance across the board. If it wasn't, then hilarious imbalances would happen. The volume would then depend on sensitivity after you figure out how much power is going to each based on load (impedance).

Anyway, those that are championing an amp severely underestimate how much power you'd need to overcome not just the 3 dB loss with each split, but other insertion losses (imperfect mating, the cable, which will actually be relevant considering the number, imperfections in the splitting technique; you can only design for two out of the three: perfect impedance matching, lossless, or isolation).

Also, contrary to popular belief, purely non-reactive resistance does actually add noise, and this amount of resistance may be significant enough with cheapo headphones you're undoubtedly using that the end result could just be some hilarious garble.

Finally, it's actually a fairly significant amount of power just in a pure lossless scenario. It's going to be about 2^6 times whatever your target power to each headphone is. Overall it'll likely be <100W, which means it's totally doable, but it's certainly not some cheapo cMoy headphone amp.

Why weren’t there cringey helicopter parents who constantly harassed everyone in their kid’s life thirty years ago? Where did we go wrong?

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>>57237910
OP, see the pic? I own one of these. It's a relatively inexpensive 4 channel headphone amp.
https://amzn.com/B003M8NVFS

You need a 48 channel headphone amp. There are very few guarantees in life, but I guarantee that it will *NOT* be relatively inexpensive. Even a 24 channel headphone amp, combined with 24 of those splitters in your pic, will not be relatively inexpensive.

>>57237910
go to >>/dys/
they have an eletricist there

>>57240883
shit i meant >>/diy/
look for the /ohm/ general

>>57240903
dys yourself faggot!

>>57240684
these adapters are cheap as fuck

>>57238765
Yes, but they don't know where I'm really taking them ;)

>>57241155
nice first post in the thread

>>57241139
Okay? I was asking about his budget and usage case.

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Can't wait for a power surge on OP's bus to electrocute 48 children

>>57238028
I think we deserve an explanation anon

Do these kids have phones?
I think that's the way easier route.
https://wisurr.azurewebsites.net/

>>57240769
How do airplanes do it?

>>57240205
DE JA VU

>>57237910
why do your entitled little shits get music, back in my day it was sing or put up and shut up.

>>57238473
I wish i had the chance to listen to exmilitary when I was a child. I would be truly patrician.

Buy earplugs for the kids who opted out and use speakers

>>57241788
In my day I just used a walkman or MP3 player and listened to my own music

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>>57238231
80s Italian disco

Why not combine some of the suggestions? Have 6 groups of 8 which are streamed to with some sort of RPi setup. Then you have much more manageable groups to power and can probably be done without some ridiculous amp.

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>This thread.
>Started out so simple.

Best thread g has had for years and it's gonna die this quickly

>>57238231
All music, it's haram

>>57240634
You get usb splitters...... duh

>>57237910
Use one of those radio transmitters to transmit the music and use simple cheap fm receivers for the kids.

Bluetooth or WLAN broadcast. FM transmitter. Speakers.

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>>57243579

>>57241488
Wiring and amplifiers.

In modern planes probably broadcasts over Ethernet , the on-board movies and all that also have to make it to the seats.

>>57241488

Doesn't every seat on an airplane have it's own jack, connected to it's own individual input?

They're certainly not all split from the same source, if that's what you think is going on there.

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>>57238300


Just use BubbleUPnP, stream the thing right onto their phones. Zero expenses, lmao.

>>57243665
> to it's own individual input?
You mean the output from the HTPC serving the seat (group), right?

> They're certainly not all split from the same source, if that's what you think is going on there.
I think there is usually one onboard entertainment server machine...

>>57240131
>>57240205
>>57241737
BEAT OF THE RISING SUN
https://www.youtube.com/watch?v=7-jt5EYHZ5U

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Best original thread weve had in months
Cant wait for the copy paste of it

What the hell happened in the last 20 years? When I went to school there was no music in the bus, unless someone brought a cassette or asked the driver to turn on the radio. Installing 48 headphone jacks in the bus is downright insane to do. You'll be messing with equipment in a way which isn't meant to be done.

>>57243817
>48 autists
>guided by an autist taking autistic advice from autistic weeaboos on a taiwaneese basket weaving forum for ants

>>57238535
I hope it's not about copyright, otherwise OP is a major cuck.

>>57238535
Shit, then tell parents to give their kid a music playback / porn watching smartphone or Ruizu MP3 player or whatever the fuck they want.

Then bring a few $5 Chinese IEM for the kids that without doubt will forget theirs as a service, and be done with it.

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>>57243828
>In orbit
>my sides

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I imagine a School Bus wired like a small Chinese Suburb where the kids are happily listening to music, strangled in some sort of wire spaghetti.

>>57240546
Nah, their parents are probably ultra leftists who are scared that ximmy will be exposed to the wrong pronouns while they force poor former human to take estrogen

>>57239251
>divided too many times to hear on the 48th set of headphones.
What if you double the number of headphones and just leave #49 through #96 in the back of the bus, will there still be sound in #48 then?

Digital Headphones with int. Amp there you Go Buddy

>>57243903
>chinese
nigga thats india
2pajeet2queet

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>mfw I am currently working at a social service institute where we pick up disabled people from their homes with a minibus and bring them to their schools or workplaces

We usually just say fuck it and crank up the music really loudly since most of them literally can't complain and the others don't mind since they won't even remember it a few hours later.

The whole shit is pretty ridiculous honestly but the parents are just glad that they don't have to take care of them for a few hours.

>>57238798
The only sane guy in this thread.

>>57243960
Then they wouldn't take away Ximmy's mandatory iPhone / iPad combination.

And you don't even need or want to bother with the entertainment you think is nice for the kids to have, 'cause parents and maybe Ximmy will feel offended anyhow.

>>57240295
/thread

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http://www.alibaba.com/product-detail/New-design-ovleng-bluetooth-wireless-headphones_60444909734.html?spm=a2700.7724838.0.0.qx3CbU&s=p
http://wholesaler.alibaba.com/product-detail/Yaika-BC06-Stereo-Handsfree-car-kit_60510145566.html?spm=a2700.7724838.0.0.aiGFQM

fm wireless headphones and an fm transmitter

with splitters you're going to have wires fucking everywhere, and things will get unplugged accidentally or intentionally (they're kids after all) constantly

FM is broadcast, so you just need to tune them in and you're golden, no fucking about with bluetooth or whatever

>>57238535
>>57243838
it's probably about the music content. I went to a christian (anglican) school, if certain parents knew their kids were listening to that sinful top 40 at school, provided by the school, they would have stopped donating to the building fund or whatever.

>>57237910
Ignore them, play music.
There's no law against using music in a vehicle.
If the parents don't want their kids to listen to music, they drive them, simple huh?
Whiners can't be choosers.

>>57244295
You don't want heretic money.

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>>57237910
>tfw you are op and actually a switchboard operator from the 1940's

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Why not simply daisy-chain them?