Make $600 3D Printed Headphones For $200!

[@photoangelov]

6:27 Actually, any audiophile, that's into DIY, knows, that single-core ethernet cable sounds great, because the copper in it is very pure by design. 9:36 Drilling holes in the cups like that should actually increase the bass. If you want less bass emphasis, change the pads to velour/microsuede ones.

[@T2star]

Those commas...

[@photoangelov]

@@T2star Now that you mention it, I think I've missed some.

[@Fir-jp3jt]

@@T2star I mean, all of his commas are correct lol

[@Peaches-yj8xk]

@@T2star whats the problem, with, his sentence, is there very little commas, may i ask?

[@Fincher123]

Now iam tryed to change the Cable´s from my ATH M50X =P

[@allstarwoo4]

If you want a better paint job rough sand @ 200 grit, primer, sand @ 400, primer, sand @ 800, then final coat. They use this process on car paint.

[@MirelRC]

I have seen people doing pc case mods and they are doing the same, and man! The results are awesome.

[@xaytana]

Does it really make a difference when you're applying roughly textured paint, though? Knocking down the layer lines, priming, then painting should be more than enough with a textured paint. Could probably even skip the primer if the paint itself is made for plastics.

[@allstarwoo4]

Xander Vice aerosolized paint is typically very thin. Even cheap air guns get up to around 80% paint efficiency. Yes, it’s from a spray can but still. Any texture isn’t from the paint, it will be from the surface. Primer will help hide low spots and flaws on the surface.

[@xaytana]

@@allstarwoo4 I know how paint works, but the paint he specifically used does have added texture to it. So I don't see the point of putting so much prep work into a project that's just going to be textured by the product being used.

[@allstarwoo4]

@@xaytana he says nothing about a textured paint. The metallic paint does have metal flakes but those are designed for a metallic effect, not texture. Without a clear coat to protect the paint those flakes will rub away with use.

[@shietitsumbr]

it amazes me when people who have $500+ 3d printers are scared of sanding for 30 minutes

[@joes661]

O.5mm layer height fixes all

[@akhilm3639]

@@joes661 do you mean .05 because .5 is pretty coarse

[@joes661]

@@akhilm3639 ye, I use a 1mm nozzle so am use to 0.8 etc Not 0.05

[@jakeconnelly2441]

Hell, spending an hour or two with your print settings, you barely even need sanding. The prints he shows in the vid are ROUGH compared to what comes off my printer (and his is 3x more expensive than mine!)

[@jakeconnelly2441]

@dougy I use a Tronxy x3. Was about $220, but requires assembly.

[@jonsilvestro3359]

Did you know that Fostex also made the original Apple earbuds? because I didnt!

[@1cj]

damn

[@winston7055]

But fostex is Asian quality and that sucks. So I don't believe you

[@xaytana]

@@winston7055 And the $150 headphones are shit in comparison to their other products. The Apple earbuds are obviously very cheap in comparison, so both companies can make profit, especially with the price of Apple products. Foster and Fostex, as an OEM and ODM, make products in a range of price points, and as an effect of this, range of quality. Basic business, Asian quality can be cheap too. And by 'Asian' I assume you mean Japanese, because China is also Asian, and they're known for their cheap-as-possible quality and manufacturing.

[@TURBOTURBOprod]

@@winston7055 apple IS asian quality. source: "Made in China"

[@modzn7904]

@@winston7055 but those earbuds also suck..

[@EposVox]

Awesome guide! I never have the time for this kind of thing, but really cool to see.

[@ihavenoideahere]

If you are worried about soldering directly to the driver, just cut the cable that connects to the driver and then solder that to the Hirose sockets.

[@Super020398]

I was wondering why this is not the standard way, as it makes the project a lot less "risky"

[@lukasschmidt26100]

@@Super020398 it might increase the resistance in the wire if done bad and could lead to a mechanical breaking point as soldered wires arent mechanically secure for movements especially in a small working space

[@Super020398]

Good point!

[@LeBeautiful]

this is why i love snazzy labs!!!

[@snazzy]

❤️

[@stevenXCV]

That Grand Seiko is looking crispy af.

[@marcd7332]

What I thought every time it came into frame

[@jonharvey6295]

I was just about to comment that, god tier watch

[@CydeWeys]

Came here to say the same thing. This isn't a watch video (or even close), so that was a pleasant surprise. Not surprised that a guy doing 3D printed electronics has a spring drive.

[@jonharvey6295]

@@CydeWeys yep, that watch is something a nerdy person with money would definitely wear

[@JR-mk6ow]

This is a underrated channel. Subbed Edit: I was already subbed 🤦‍♂️

[@snazzy]

Thanks so much! Welcome. :)

[@rrp6405]

I subbed too but clicked it again just to be sure

[@cashwood]

RRP so you unsubbed

[@rrp6405]

@@cashwood I been subbed for ages. Doing a captain disillusion reference

[@amit8961]

y u unsubbed

[@PCFees]

This is great man! I modded my Sennheiser HD 518s and they sound so close to 598s now that I've been using them for three years without feeling the need to replace them.

[@snazzy]

Awesome! They’re killer headphones to be sure.

[@vampula12]

518 are the same as 558/598, just enclosure differs a little.

[@PCFees]

vampula12 hence the mod. They have different sound signatures because of the enclosure. And the pads. The drivers are the same in all the 500 series I believe.

[@pyro530916]

If you're looking to do this mod the T40RP and T20RP will work as well. The drivers are identical, the T50RP are sometimes more expensive second hand for whatever reason.

[@Stweaner]

If you are going to use Methylene chloride, please be extremely careful. It has a very low boiling point and will vaporize. It is a severe carcinogen, so it is recommended to only use it in a well ventilated area, like a fume hood or outside.

[@0Logan05]

Solder with the Pcb’s sandwiched inside small Aluminum Blocks near the soldering area to pull heat.

[@MrHershey2424]

Was that a Grand Seiko I spotted? A man of taste.

[@marcd7332]

A man of culture

[@ReTr093]

A man that acts like there is anyone that doesn't ultimately buy watches to flex and stupidly wasted money on a watch that will result in neither pussy nor respect

[@MrHershey2424]

@@ReTr093 no different that flexing cars, jewelry, or a new handbag. People can do whatever they want with their money.

[@arancourt5623]

I realize that you're doing an el-cheapo take on the the alpha dogs, but my heart kinda broke when I saw that you threw the same (Insert expletive here) stock pads that came on the T50RP's. The biggest thing you can do for the T50's is to swap to way better pads, I like Brainwave, leather pad made all the difference in terms of bass presentation and depth. Definitely consider thicker/different material pads.

[@czdot]

Snazzy is literally the only English-speaking youtuber, who pronounces Průša the correct way. Well done. :-D

[@Matt45_252]

.... Snazy.... You didn’t change the ear pads... that’s the ONE mod you HAVE to do. These are the best budget headphones. All you have to do is change the ear pads!

[@peterc3619]

And what ear pads should you replace them with?

[@Matt45_252]

Peter C something like HM5 Hybrid pads are amazing! They’re really comfortable, cheap, and they make the headphones sound a little less harsh. I would highly highly recommend them..

[@TommyFro]

@@peterc3619 MrSpeakers sell his own Alpha Pads on his website or you could go with something from ZMF. ZMF is another company that got their start modifying t50rp's and still does with his ZMF Ori and Blackwood. I personally have the Ori and have had multiple pairs of the stock t50rp in the past and it is incredible how well this headphone takes to mods and proper amplification

[@ahpoiseheh]

Nice video and all, but what I’m REALLY INTERESTED IN is that Grand Seiko Spring Drive in your hand. WOW. I know this is not Snazzy Boutique, but I would love to see a video of yours reviewing that piece or, who knows, the story behind your purchase or gift. Anyway: congrats man, on your videos (and on THAT BEAUTIFUL WATCH!) 👌🏼

[@snazzy]

Bought it! Had a really good year on KZbin last year and I’ve wanted one of these for years, so it was my “bonus” to myself. ;)

[@LeftJoystick]

This seems like a LTT project. Yay for awesome videos!

[@snazzy]

Thanks for watching!

[@InfernosReaper]

How is it like a LTT project when those usually end in comedic levels of disaster? ;)

[@pingozingo]

Linus would order one of his staff to do all the hard work and then he'd drop it to assert his dominance.

[@bonko86]

@@pingozingo as is tradition

[@tehj1543]

@@pingozingo hilariously accurate 😂

[@JimmyChampane]

This video is so cool. Definitely something I’d only expect from you. I just got some new headphones but my buddy has a 3D printer and would have a blast doing this so I sent a link over to him. Great work, man!

[@snazzy]

Glad to hear it. Thanks, Jimmy! :)

[@maximman102n7]

To get a candy coating, you need to sand, use primer, sand the primer, and in a fairly dust free place, use spray paint, and apply clear coat spray paint after

[@SianaGearz]

You know what's good? Model paint like Revell "enamel" type, simply brushed on. It's self levelling, it's got an insane amount of bite on plastic, it doesn't chip, it can be sanded and polished. It's alkyd resin paint, similar in behaviour to oil paint, just sets quicker, but it still takes a while. Though i would suggest it's worth it. As an electrical engineer: Ethernet cable strands are perfectly adequate for the 3cm link inside headphones.

[@priyonjoni]

The title made me think this was a video about Beats by Dre’s business model.

[@matthewmooreproductions1556]

I am kind of confused how rebuilding the headphones make it sound better. Can someone explain?

[@SnowvaBear]

I could be wrong, but from what I understand when it comes to sound, the enclosure can be just as important as the drivers for headphones. Changing the enclosure can change the sound signature, especially with higher quality drivers.

[@matthewmooreproductions1556]

AntaresNova That makes sense

[@snazzy]

This is correct. The enclosure is hugely important. These T50RP drivers are actually used in some of Fostex’s more expensive headphones and they’re kinda “nerfed” in the T50RP’s enclosure to avoid needing multiple driver SKUs. The enclosure is arguably even more important than the driver. And if you think about it, it makes sense. Speakers work by pressurizing and depressurizing air. From where that air is sourced, how far the distance and what angle your ear is to the source, the shape of the chamber in which the air enters/exits and with what dampening all change how a headphone can sound. This headphone mod and the original sound nothing alike. It’s almost hard to believe the electronics are the same in both.

[@InfernosReaper]

I'm kinda curious as to what the sound difference between using the stock plastic with the added materials is vs the complete overhaul.

[@kingsolomon174]

It doesn't at all they just changed the look

[@ELJefeReviews]

I really need to try some Fostex headphones! They've been on my wishlist for some time.

[@BornaPrpic]

If you want to have a nice "finished look" on your 3D printer (Prusa MK3 just like mine). For top and bottom flat surfaces . I like to put "Hilbert Curve" for the top and bottom layer. Looks awesome truly.

[@snazzy]

Didn’t know about that! Looks pretty. Gonna have to give it a shot. Thanks!

[@SuperGangles]

Really enjoyed this video! I miss the old videos of early snazzy audiophile content. P.S. Nice grand seiko as well.

[@snazzy]

Thanks!

[@HiFiInsider]

The first MrSpeakers was a Mad Dog. Nice to see audio gear videos from you. Look forward to more. Perhaps cover some electrostatic audio products? 😁

[@gcjackofalltrades]

Can I just buy that one you made? Asking for the community. Hifi for all

[@snazzy]

I’m not going to be needing them since I have the originals. Maybe I’ll have to do a giveaway. ;)

[@AlejandroFerrariMc]

@@snazzy Put your autograph on one of the ear cups and sign me up!

[@kyrkish]

I’ll buy that for 600 :-)

[@fibeus4461]

That Grand Seiko is proud af :P

[@MrHeHim]

Makes me wonder if all you had to do was replace the dinky little wires and add the new connector, then add the same sound deadening to the original enclosures. As a kid (about 10 y/o) i had some 3 way floor standing Fisher speakers (ones with white foam for the cones) that i replaced the internal wiring with heavier gauge monster cable and greatly improved bass, mids, and cleaned up the high end but was careful not to turn it up too high because then you could smell what i assume was the coil burning lol. Before i got rid of them i spray painted the woofers cone with some automotive paint to give it a hard surface which further improved bass as i think it helped stiffen the cone and couple the air maybe lol.

[@snazzy]

There are a lot of mods that retain the stock enclosures and they help the sound a ton. These definitely sound a step up, but if you absolutely don’t have access or interest in a printer, you can DIY with the stock enclosures and get 90% there.

[@Evie0133]

It would've been DOPE AF if you put Snazzy Labs logo on it :) You're the best Quinn! Love your videos :)

[@antonhelsgaun]

You could also just cut the wires to make sure you don't overheat it

[@jeppewerring]

Love these type of videos from you!

[@martinfuhs8955]

Nice Grand Seiko Snowflake on your wrist :) beautiful watch. Own one too. Spring Drive is just a fascinating work of art.

[@ShortHandedNow]

Wow just awesome! I think I have found my next project :). For those of you who don't feel like this project is in the wheelhouse might I suggest the Audio-Technica ATH-AD900X's. (Roughly $150 USD on eBay & Amazon).

[@snazzy]

Cheers!

[@c0llym0re]

i´ve seen so many people using modded rp´s but the way you created the storyline was perfect. Should be a post-it on youtube :)

[@snazzy]

Thanks so much!!

[@joonasmyllymaki3297]

Very interesting video! Also sick grand seiko 🔥

[@snazzy]

Thx!

[@seanbyju]

Wow you wear a Grand Seiko! Nice Watch man!

[@snazzy]

Thanks, mate!

[@michaelrudnick8116]

I wonder if you use different material for the cups if you could get it to sound better/different?

[@DFMurray]

"Hammer tone" paint works really well to hide imperfections as well.

[@xaytana]

I'm surprised planar speakers are more expensive. I would think they'd be cheaper, since it's just a flexible pcb, and some rigidly mounted magnets. Maybe most of the cost is from having to build out entirely new manufacturing lines with entirely different components to them. I kinda want to see an actual audio engineer have a go at these, make a perfect cup for a specific sound profile.

[@ederst9759]

You don't need a fancy paint gun, you just need to learn how to wet sand and buff clear-coat by hand. Look at some of the KZbin video on DIY guitar finishing...

[@AranakAsulis]

Wow, this wasn't click bait. That's an impressed like from me.

[@snazzy]

Thanks for watching. ;)

[@HecTechFPV]

6:27 Aww man missed opportunity there to use a twisted pair then the audiophiles would have loved you!

[@undisclosedmusic4969]

Hey Quinn, any plans to make a base 2019 iMac to fully loaded 9900k iMac video? Rumour has it that the NVME should be upgradable with the 970 Evo and some adapter and that the Z370-based Macs should be able to support a 9900k(f). Would really be interesting! Thanks a lot

[@Shenepoy]

change the ear pads(pancake pads) for better ones

[@dchall8]

The red color on those headphones is called candy apple red. It's made by painting a layer of the finest glitter (think stripper glitter) and cover it with translucent red and a final layers clear top coat. They paint cars like that.

[@carimpest]

Earpads are a fundamental and critical factor in any headphones , they can make all the difference between a good pair and a band pair

[@jackblackdeath]

that's a crazy story and a crazy project.... i love it!

[@snazzy]

Thanks so much for watching!

[@rebilacx]

getting a good paint finish doesn't require a ton of delicate sanding and a really high end paint gun.

[@JohnSmith-pn2vl]

actually a lot of sanding is the trick, you sand after painting, paint again, sand again. repeat this 5 times and you hav piano lacker

[@hendri-6341]

did u wear grand seiko on 5:20? if yes, what GS is that?

[@snazzy]

SBGA211

[@anton.lundberg]

5:42 Nice watch! grand seiko?

[@onlypinkytube]

very few people makes those complains about the T50rp Mk3. the mark 3 out of the box is highly praise just need a pad swap. The mark 2 may had those complains but definitely not the mark 3. for more details on those models check DMS, ZEOS Reviews or Joshua Valour.

[@caliden2]

Glad to see this! I was confused to hear him say many people have complaints about these... the Mk3 is fantastic, even more so when you consider the price.

[@snazzy]

MK3 I still find far too shrill on the high end, but it is indeed a massive improvement from MK2. The different screen they use on the driver makes a notable difference.

[@igotsth]

I gotta 3D print a pair of new ears first. because I can't tell the difference between $50 and $300 headphones...

[@NormalSpeedGamer]

Dude you just saved another $250, i see that as an absolute win😂😂

[@quintijnbulterman4753]

You Should do More with (high-end) audio. Its a fit for the Channel and you!

[@zenboy863]

I'm tempted to try this but dont have the most stable hand. More headphone mod videos would be great, thanks Snazzy.

[@snazzy]

Cheers!

[@victornpb]

1 inch of wire is not going to make any difference in sound, when you have a 10 feet cable in series with it, also audio is very low frequency so anything that measures 0ohms will do. I would care more about mechanical properties than electric. I would use enameled stranded wire just to avoid the wire memory of solid core copper putting stress on those pads, or rattling around. But to be honest you’re fine if you never open then again. But if your going to open is better to use something flexible to not lift pads on the flex membrane of the driver.

[@Irishrebel092]

when you realize that, even unmodified, the T50RP's still sound way better than any headphones that 90% of us will ever own......

[@pabloespinoza4462]

Grand Seiko? A man of taste I see.

[@snazzy]

😉

[@arancourt5623]

Is it wrong that I dropped more money on a balanced cable than I have for the rest of this project combined?

[@aliozanerbektas]

So basically you just swapped the drivers to a new set of earcups. Yes, I'm that guy, again.

[@snazzy]

Yes. Basically I did. And it made them sound like completely different headphones that cost $600 a few years ago.

[@aliozanerbektas]

@@snazzy I love you! ❤️ (no homo)

[@duke86fan]

if you are too scared to do this/want a different sound than the alpha dog or whatever kind of similar thing youd make/prefer something made by someone else other people like modhouse, dekoni, and i think ZMF still do modifications of fostex with different kinds of damping material and tunings that might fit you more.

[@TheSonicFan4]

Wouldn't making holes in the headphones increase the bass, not reduce it?

[@peetiegonzalez1845]

That Cat 5(6?) ethernet cable is almost certainly 28AWG, exactly as called for in the recipe. edit: Actually probably 26AWG, a little thicker than called for, but audiophiles love ethernet cable, I doubt they're gonna be complaining.

[@dechrysen]

I guess it doesnt matter that much with headphones (because the cable is pretty short) but the cable is not balanced right?

[@snazzy]

Nope. Although you could quite easily.

[@antonio1681]

The ear cups look awesome !

[@dmitrychristie6487]

I've been meaning to ask you something. Are you secretly a son of Strange parts?

[@data_phile3923]

Something I tend to see youtubers miss a lot when 3d printing, you can sit your prints in an acitone vapor bath to make the plastic smooth. I beleive Adam Savages Tested channel did a video on it.

[@snazzy]

Only works well for ABS. :)

[@PocketUau]

That Grand Seiko is sweeet!

[@wpherigo1]

Sweet Grand Seiko! Looks fantastic!

[@snazzy]

Thanks so much!

[@MrTheSmoon]

3:08 adam savage calls it hiding your crimes

[@melaniatrump2166]

thumbnail looks like that japanese tv show where people make poses to go through moving walls with holes in them

[@miggyo.2235]

Hole in a Wall?

[@peter_parkour]

First time watching your videos and this is totally amazing. Subbed 👍🏻

[@snazzy]

Cheers!

[@shark471]

Went through all this effort to make an awesome headphone, kept stock pads (the worst pads on the planet).

[@kvarley87]

you did all that and saved the ear pads? awesome vid tho. I did a t50 mod a couple weeks ago.

[@JeanRodo]

Ayy this is pretty awesome this is something I would definitely want to do as soon as I get a 3D printer!

[@THYCR3AT0R]

I havent watched the whole video yet but you can get a good paintjob as long as you sand it well, even a can of spraypaint looks good if you prep and paint right. Most of the shine is in the clearcoat anyways.

[@maverickbonato8164]

Look at this guy... Flexing with his Grand Seiko without doing a proper collection video... REEEEEE

[@snazzy]

One of these days I’ll get one up somehow.

[@maverickbonato8164]

@@snazzy Finally! I've been waiting for so long! Don't take it as a priority though ofc since the views will be much lower compared to your normal videos but if you had the time maybe even one every year or every couple of years would be extremely appreciated :)

[@sygyzy]

Wow really great video! I remember when Mr Speakers first started. I can't believe he/they are still going strong. I have a stack of headphones in the corner of my room ready to sell and I know there's a modded T50RP in there. Thanks for making this video but mostly I wanted to post this comment to ask: are you wearing a Grand Seiko? Holy smokes dude! Is it the Snowflake? I'd love it if you did a video on it.

[@snazzy]

Thanks! And good eye! It is a snowflake. May do a collection video here soon. :)

[@PresidentMateo]

He-row-se connector not High-rose. It's a Japanese company.

[@snazzy]

You learn something new everyday!

[@KarlHerzog]

Spelling it HiRose isn't helping lol

[@profosist]

So want to do this! Can put some of my custom keyboard skills to work. Also give me that excuse to buy a 3d printer. After these cans, next stop custom shells for gaming mice!

[@snazzy]

Do it!!!! :)

[@royshaft]

" Cot-hen " ? Now say " cool whip ".

[@slaps_only]

You mind sharing the link that shows where to buy those headphones for 135?

[@evelynlonely]

Make $600 headphones for $200 and sell then for $500. Profit. Repeat. STONKS

[@TomasLomba]

Curious as to what version of the T50RP is best suited for this

[@dnalekaw4699]

the mk2 definitely

[@TomasLomba]

dnalekaw any particular reason why?

[@dnalekaw4699]

@@TomasLomba yeah, the mk2 has a more restricted rear driver damping, allowing for better bass extension and more controlled highs. It is also what the original alpha dogs used along with some wool felt on the rear of the aforementioned driver damping

[@TomasLomba]

dnalekaw oh ok. So if I tried to build these based on a MkIII I wouldn’t have similar results?

[@dnalekaw4699]

@@TomasLomba absolutely not, it will be very different since the driver damping scheme of the mk3 is very different. However, the results maybe towards your liking

[@YouTubeDoxedMyRealName]

Thats interesting because porting a lot of cans increases the bass.

[@Killer-wu9hk]

if u add holes in the headphones it will actually increase the bass just lile why subwoffers have a hole in the back (usually has a hole in the back)

[@GlaciaDay]

The good old audiophile snazzy lab video, nice.

[@ElZamo92]

Dude, audio is far form the only thing Foster makes. When the company I used to work for were beginning to build their first automated production line Foster robotic arms were an option I found.

[@Ellipsis115]

I'm going to do this but only after I read up on soem physics and chemistry

[@go1485]

Samson SR850 for the win, I really love thses pair of headphones (I also own the Superlux HD681). Great headphones even better after some eq adjustments to tame the highs. The superlux only cost me £23.99 while the Samson was £19.85...simply amazing for listening to songs and doing some music production

[@thomaslam778]

Amazing video, any chance you’ll try to make diy electrostats? It’s a lot more difficult but well documented online

[@sleev1091]

I don't understand your problem with these headphones. I bought them _specifically_ for being open-back planar dynamic. The wide sound stage sounds amazing. I don't get the point of closing it off.

[@lapinus]

5:42 *Breaking Bad intro starts playing*

[@snazzy]

😂

[@lapinus]

@@snazzy Lydia: I can relate

[@haythamfpv]

Nice! One question, does it sound better than the dt700? I'm either getting this or them

[@JohnSmith-pn2vl]

dare is say the dt 770 is the best headphone of all time. affordable, repairable, great sounding.

[@SolomonLi]

Got to put the lamb skin angled pads on for the full experience... Just awesome.

[@yoyoman62002]

What infill and layer height did you use for your prints?

[@Sabebo13]

Must the cable be changed in order to fully take advantage of this mod? I understand the enclosure side of things but not why the cable is changed. Thanks

[@MosoKaiser]

As for sound quality? No. It's mostly just that the Alpha Dogs originally used Hirose connectors, so that's what the first released Open Alpha designs call for. Now the cup files are designed with the connectors on each side, so to reuse the original cable you'd need to either modify the 3D print designs to remove the connector mounting on one side and alter the other to accommodate a 3.5mm socket, and make holes in the cups for the single-entry cable that goes over to via the headband. Also, if you don't feel like getting those rather expensive and relatively obscure Hirose connectors for the cups (and cable), there's alternate cup designs out there nowadays that are modified for using more ubiquitous 2.5 or 3.5mm sockets.

[@TheBrian900]

Looks a lot harder than I thought it would be

[@ReikazeRambles]

It seemed fairly straightforward to me. The only hard step is the soldering.

[@snazzy]

Nah, it isn’t too shabby. That said, there are many simpler Fostex T50RP mods out there that might not make such a huge difference as this but will be much simpler. :)

[@TheBrian900]

@@snazzy I might attempt this then. Thanks for posting, I've been in the market for a good pair of HiFi headphones.