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>> No. 26118 Anonymous
11th October 2017
Wednesday 5:47 pm
26118 Phone issues.
Any lads in here that are good with phones? My note 4 crashed and I got this come up. been like it for over an hour now. Other than getting a new/secondhand phone anyone got any clue what it's doing?
7 posts omitted. Expand all images.
>> No. 26212 Anonymous
19th November 2017
Sunday 9:31 am
26212 spacer
This is a PIN for a standard lock screen, yes?

Try defaults like 0000 and 1234. Don't have too many goes of course, or you'll set off the timer.
>> No. 26213 Anonymous
19th November 2017
Sunday 11:11 am
26213 spacer
It's an Honor 9, bought brand new and dispatched by Amazon. Should be completely unlocked too.
>> No. 26214 Anonymous
19th November 2017
Sunday 11:26 am
26214 spacer
Just tried to do a factory reset, tried all the PINs beforehand too. Got the message "Software install failed the update package does not exist. Please download the package again"
>> No. 26215 Anonymous
19th November 2017
Sunday 12:18 pm
26215 spacer
So can't you just ask Amazon for another one?
>> No. 26216 Anonymous
19th November 2017
Sunday 1:41 pm
26216 spacer
Looks like I'm going to have to. Managed to get a little further with the factory reset but it's asking for a gmail address that was synced with it beforehand. Clearly this isn't brand new. It's just a ballache to get a replacement because I'm leaving where I am right now, tomorrow morning.

>> No. 20156 Anonymous
19th December 2013
Thursday 11:57 pm
20156 Vaporisers
So, who here's tagging along with this latest drugs craze?

I know there was at least one of you with good knowledge on this subject in a smoking thread we had on /b/ a while ago, but I thought we could do with a general dedicated thread now it seems more and more of us are getting them.

I've personally just invested about £50 for two Kanger e-Smart batteries with clearomisers, liquid and addendums and I'm quite enjoying this whole vaping business. It seems to be even more moreish than cigarettes, and I'm looking forward to going through some of the tastier flavours. What setups have you got? Any comment on my kit (510 battery, T3 clearomisers) if you're familiar with it? I seem to already be getting that sucking/gargling noise which is apparently to do with the liquid being in parts of the apparatus it shouldn't be, but have followed YouTube guides to try and clear it out to no avail.

Anyway, yes. Vaporising general.
342 posts and 40 images omitted. Expand all images.
>> No. 26145 Anonymous
17th October 2017
Tuesday 9:40 pm
26145 spacer

Sufficiently dense vapour will trigger an ionising or photoelectric smoke detector.
>> No. 26146 Anonymous
17th October 2017
Tuesday 10:27 pm
26146 spacer
I learned something new today. Cheers.
Don't worry McJob lad, I won't do it again.
>> No. 26205 Anonymous
14th November 2017
Tuesday 9:43 pm
26205 spacer
Reporting my experience at just under a week in and it's pretty ace.

I've not had any cravings for proper fags even though I'm on 3mg. That might be down to the fact that you can puff away constantly but still, I just tried a fag as a bit of a treat and it only made me feel ill. Early days admittedly but I could get used to this until I inevitably lose it on a night out.

I picked up the Endura T20s Kit. Pretty cheap but I've had no problems at all and it seems well built.
>> No. 26206 Anonymous
15th November 2017
Wednesday 3:43 am
26206 spacer
So I've been using a little Joyetech all-in-one box for the past year or so, and I think it's about time to upgrade to something fancier. I was wondering if you chaps would have any recommendations? I think it'd be nice to be able to adjust the power and airflow, that sort of stuff. Just a bit more of a customisable experience than I have now, but nothing too in depth like these ones you have to make up your own heads and regulate the flow of liquid or whatever.

I like the look of something like:


But I would be interested to know if there's anything a bit more exciting out there, or if you lads have any good ideas on separate tanks/boxes.
>> No. 26207 Anonymous
15th November 2017
Wednesday 7:38 am
26207 spacer

If you're broadly happy with your Joyetech all-in-one, then there's a more advanced version available called the eVic AIO. It uses the same Cubis coils as the basic Joyetech devices, but it has variable wattage, temperature control, variable airflow and a user-replaceable battery.

Whatever you buy, I'd suggest importing it from a Chinese supplier. It's considerably cheaper and you avoid the 2ml liquid capacity limit that applies to products sold within the EU. Shipping usually takes less than two weeks.


Alternative all-in-one devices with advanced controls include the Kanger Cupti and the Aspire Plato.


If you'd prefer a separate mod and tank, then there are a dizzying array of choices. I think that the Joyetech eVic Primo Mini is a safe choice. It's compact while still being powerful, it feels good in the hand, it has reliable temperature control, the included tank is easy to fill and has a good selection of coils and the kit is very reasonably priced.
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>> No. 21674 Anonymous
25th April 2014
Friday 11:25 pm
21674 Mechanical Keyboards
I plan on buying a Mechanical Keyboard, generally for gaming more than typing.
Can you suggest some good ones?
Preferably with Brown MX switches.
36 posts and 1 image omitted. Expand all images.
>> No. 22855 Anonymous
12th August 2014
Tuesday 7:45 pm
22855 spacer
I still use a PS/2 keyboard, my year old motherboard has a slot for it.
Though I doubt my next motherboard will have a PS/2 slot on it.
>> No. 22856 Anonymous
12th August 2014
Tuesday 8:54 pm
22856 spacer
You can get active PS/2 to USB adapters.
>> No. 22911 Anonymous
16th August 2014
Saturday 6:02 pm
22911 spacer

Put the Dell out of its misery and replaced it with this.
>> No. 22912 Anonymous
17th August 2014
Sunday 11:52 am
22912 spacer

If nothing else I hope we never see the end of PS/2 because it gives a splash of colour to the connectors.
>> No. 26202 Anonymous
11th November 2017
Saturday 2:25 pm
26202 spacer

The Dell has been mostly resurrected with a bit of solder and a couple more donor keys. The space bar isn't very well stabilised, though.

Not that it matters; I got this bad boy a couple of weeks ago and I couldn't be happier.

Ben Rich - Skunk Works.jpg
>> No. 26124 Anonymous
12th October 2017
Thursday 6:07 pm
26124 spacer
I've recently set up an SSD booting computer with HDD storage, which was pretty fun, but it took a long time considering I've never fucked with computers before. What other interesting shit can I do?

I've been thinking of maybe upgrading my graphics card, motherboard and CPU, probably installing more RAM, but I don't really have the money right now and can't figure out what is compatible with what. Even finding which is the most recent products of the various manufacturers is confusing. Besides ,I find I'm becoming bored of browsing the internet all day every day. Are there any cool things I could do with computers that doesn't revolve around increasing performance of games/internet? What can I use this computing power for?

Making a blind system for my window with a light detector that opens them in the morning would be pretty cool but I think that's more in the field of circuitry than computing.

So without further ado; Noob tier computer projects. What would you recommend?
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>> No. 26197 Anonymous
5th November 2017
Sunday 11:14 am
26197 spacer

PCB is probably fried.
>> No. 26198 Anonymous
5th November 2017
Sunday 2:07 pm
26198 spacer
I work in IT support, and come across this sort of thing all the time. The likelihood is there's a problem with the motherboard or power circuitry like >>26196 said.

Still, I would recommend unplugging the battery, holding the power switch down to flush the capacitors (does this actually work?), then reconnect the battery. In my experience, there's usually a cable to connect the battery to motherboard - it will have a plastic multi-pin female connector. See if you can find it.
>> No. 26199 Anonymous
6th November 2017
Monday 11:14 pm
26199 spacer
How did it go, >>26194?
>> No. 26200 Anonymous
7th November 2017
Tuesday 12:20 am
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Shit we have an IT guy here? Help me out. My Windows 8.1 box keeps turning itself back on randomly after shut down. I've gotten into the habit of physically pressing the O button on the PSU, so it doesn't start whirring in the dark while I'm trying to sleep and scare the shit out of me. What could it be? I'll admit just now I found my mouse and keyboard were both set to wake the computer in Device Manager but I imagine that's because that resets itself after I keep having to unplug them and plug them back into other USB ports after they randomly stop working. Christ this PC is full of demons, I guess that's what comes of building it yourself. Anyway apart from the mouse and keyboard is there anything else it could be?
>> No. 26201 Anonymous
7th November 2017
Tuesday 2:36 pm
26201 spacer
We have lots of IT guys here.

>I'll admit just now I found my mouse and keyboard were both set to wake the computer in Device Manager

You're probably done. I'd also check the BIOS to see if there's anything in there that's set to turn the PC on. This isn't what comes of building it yourself, by the way. These are not default settings, so at some point you've installed something that changed them.

I'd also chuck Win8 for 7 or 10 (depending on how deluded you are about the disparity of Microsoft's intrusion of your privacy on either).

Capture12 copy.jpg
>> No. 26191 Anonymous
2nd November 2017
Thursday 11:47 am
26191 spacer
Is it possible to associate PDF file types with Chrome but give them a different icon from HTML files? I had them like that but had to reinstall Chrome. Now PDF files have the same Chrome icon as HTML files and it says the file type is "Chrome HTML Document." When I edit the name or icon with Types.exe, Default Programs Editor or FileTypesMan, changes I make to PDF associations happen to HTML files too and vice versa.

Last time, I gave PDFs a separate icon with Types.exe but I think that might have been on Windows 7 before I upgraded to 10.
Expand all images.
>> No. 26192 Anonymous
2nd November 2017
Thursday 12:21 pm
26192 spacer
File icons use the same icon as the application they're associated with — that's just a rudimentary UX practice. You'll need third-party software if you want to circumvent that.
>> No. 26193 Anonymous
2nd November 2017
Thursday 12:28 pm
26193 spacer
I've tried to circumvent it with three types of third-party software (Types.exe, Default Programs Editor and FileTypesMan) and it doesn't work like it used to.

>> No. 26181 Anonymous
21st October 2017
Saturday 8:07 pm
26181 Finding a CRT
I'm after a ~21" CRT TV, with a regular SCART 15.6kHz RGB input. Used to be you'd find them at dumps and markets and such but I haven't come across one in a while and the recycling place I went to today didn't have any. I can't find any near me on Gumtree or Ebay, which is puzzling as there must be fucking millions of these things around.

Am I being a mong? Where do I find one?
2 posts omitted. Expand all images.
>> No. 26184 Anonymous
22nd October 2017
Sunday 11:19 am
26184 spacer
Yeah - unless its a pristine mint broadcast Trinitron tube I wouldn't go anywhere near it. And one of those is likely to cost.
>> No. 26185 Anonymous
22nd October 2017
Sunday 11:54 am
26185 spacer
There are of course a bunch on ebay but they're all an hour+ drive away. Freecycle is a good shout, I'd forgotten about it, thanks.

I've already got a huge Sony PVM for retro games as >>26182 guessed, but I need to get rid of it for space and because it's apparently now worth ~£250. I can make do with a little old TV instead. I just don't want to pay stupid prices for one when they used to go for free, god knows how many I've passed up over the years.

I'm not that fussed about how good the display is. That said, I'm expecting to have to go through a few to get one with halfway decent convergence and geometry, but it's surprising how well many CRTs have lasted, given the astonishing engineering precision required of them, and I have fixed CRT monitors in the past so I can take a crack at adjustments depending on the design. (To preempt the warnings: I do know how to do so without grabbing the flyback, discharging one of the capacitors and electrocuting myself, or snapping the neck and having a vacuum tube explode in my face.)
>> No. 26188 Anonymous
22nd October 2017
Sunday 12:08 pm
26188 spacer
>vacuum tube explode implode in my face.
I fixed that for you.

Sorry for being a cunt, but I was born this way.

It took me three attempts to get this post right.
>> No. 26189 Anonymous
22nd October 2017
Sunday 12:46 pm
26189 spacer

If you're not fussy, you could probably scrounge one at your local tip.
>> No. 26190 Anonymous
23rd October 2017
Monday 2:53 am
26190 spacer
No, you're quite correct. Or we're both pedantic cunts, which I'm fine with.

I've tried mate. They don't have any, and the ones I was finding elsewhere seemed to be either 14" built-in-VHS shite or >32" monsters. Most of the latter are also widescreen which is not what I'm after, and some of the last ones before plasma/LCD took over completely have digital image processing in them, with shoddy ADC, and early real-time digital image processing chipsets that added noticeable artefacts and latency. I used to have a WEGA that did this (it was great TV for movies at the time, but the image processing was particularly noticeable on old "240p" games, and couldn't be fucking disabled) and it drove me nuts.

One's popped up on Freecycle so should have something to play around with soon. Thanks, >>26182.

>> No. 26139 Anonymous
17th October 2017
Tuesday 3:49 pm
26139 spacer
def kaprekar(n): assert 0 <= n <= 9999 curr, prev = n, -1 while curr != prev: digits = '%04d' % curr print(digits) desc = int(''.join(sorted(digits, reverse=True))) asc = int(''.join(sorted(digits))) curr, prev = desc - asc, curr # demo for i in range(10000): kaprekar(i) print('----')

23 posts omitted. Expand all images.
>> No. 26175 Anonymous
20th October 2017
Friday 1:57 pm
26175 spacer
So can you know where you are based on the stars alone?
>> No. 26176 Anonymous
20th October 2017
Friday 2:46 pm
26176 spacer
You can determine latitude easily. Longitude is rather more difficult, for obvious reasons.
>> No. 26178 Anonymous
20th October 2017
Friday 4:20 pm
26178 spacer
If you knew what day of the year it was and time of night you could definitely do it.

The time of night you could probably make some sort of estimate of based on the position of the moon after knowing the time of year. The time of year you could make a 'good enough' estimate based on which stars are present in the sky for a broad estimate and then use the phase of the moon to calculate a more exact date.

I have really no idea how precise any of this navigation would be based on eyeballing, probably good enough to get you across an ocean and in the direction of the right port.

If you had precision measuring tools and a sophisticated computerized star chart you could probably calculate your exact position on the earth.
>> No. 26179 Anonymous
20th October 2017
Friday 4:34 pm
26179 spacer
It was not really known how to calculate longitude accurately until around the 18th century. The major way people determined it was by using latitude, speed and direction to estimate it using the ships vectors of movement against a known position.
>> No. 26180 Anonymous
20th October 2017
Friday 5:08 pm
26180 spacer

I agree but the question was about ability to determine your position with no other points of reference.

>> No. 26115 Anonymous
11th October 2017
Wednesday 5:36 pm
26115 spacer
I'm trying to get a domain name I can use as an email but I'm an idiot and I'm confused.

I'm looking to get 4 email addresses I can use , say bob@family.com. I don't want to just have a forwarding service to bob@gmail.com, I want to login to an actual mailbox client or webmail login and use that specific email to login.

I'm not interested in web hosting.

Is this possible, and if so where is the best place to do it? I've had a look about and I'm still none the wiser.

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>> No. 26116 Anonymous
11th October 2017
Wednesday 5:39 pm
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>> No. 26117 Anonymous
11th October 2017
Wednesday 5:43 pm
26117 spacer
Easy enough to do, but not necessarily for free. You're looking at hosting your own email server, or using an off-the-shelf cloud solution like Google's G Suite or Microsoft Exchange online.



I was lucky enough to get a Google Apps account back when they had a non-expiring 5 user trial plan. Still use it for all my domains.
>> No. 26121 Anonymous
11th October 2017
Wednesday 6:35 pm
26121 spacer

> I'm not interested in web hosting.

Most domain resellers will offer basic hosting packages, web hosting, email hosting, or a combination.
>> No. 26123 Anonymous
12th October 2017
Thursday 10:59 am
26123 spacer
>I want to login to an actual mailbox client or webmail login and use that specific email to login.
I know it would be frowned upon to just call you grandad, but I'm curious as to the exact use case you're trying to satisfy here.

>> No. 26112 Anonymous
8th October 2017
Sunday 11:12 pm
26112 Neural networking
I figured it was time for me to drag my arse into the twenty first century and at least learn how to program a neural network. It doesn't seem that complicated, but it occurs to me that I'll need quite a bit of training data.

Where can I go to get piles and piles of files? I was wondering whether I could train an AI reading a bunch of novels in text file format and then set it loose trying to write semi-intelligible sentences. Even if it's not text files, it seems that you need loads of well formatted raw data to train any AI and this is one of the things tech companies are super hungry for these days. Any other sort of raw, open, free data would suffice if anyone's got any hints.

I was thinking about writing it in BASIC (which is the only language I ever properly learnt, at the tender age of five, and so has stuck with me my whole life) or maybe in an Excel/LibreOffice Calc/Google Sheets spreadsheet (in which case free .CSV files might be preferable) because it'd be more visually comprehensible. I can just about read C++, I could probably write a neural network with it if I applied myself.

Has anyone else worked with neural networks? Are they difficult to program? What's the best language?
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>> No. 26113 Anonymous
9th October 2017
Monday 12:01 am
26113 spacer
As far as I understand it, NNs work much better in object-oriented languages, so perhaps try Visual BASIC.NET instead of straight BASIC.
>> No. 26114 Anonymous
9th October 2017
Monday 4:37 am
26114 spacer

>> No. 26103 Anonymous
26th September 2017
Tuesday 9:19 pm
26103 Mobile Ad Blocker
Is there such a thing as a decent ad-blocker for Android?

It's occured to me that ads are responsible for probably half of my entire data usage. I spend more time scrolling past fucking reams of obnoxious clickbait bullshit than I do reading the actual article sometimes. Some sites are worse than others, but I can't exactly pick and choose what sites I visit based on that. Not to mention those cocking Youtube ads.

Being on a shitty tarrif, it simply angers me to think that I am wasting data so that these bastards can shovel vomit into my eyeballs. I'm actually paying for them to advertise to me. How do I stop it?
3 posts omitted. Expand all images.
>> No. 26107 Anonymous
26th September 2017
Tuesday 11:50 pm
26107 spacer
I was about to say I think advertising companies should be made to pay for data that they use when sending you adverts, then it occured to me that that would violate net netrality, then it occured to me 'Is net neutrality protest actually a front for online advertising groups?'
>> No. 26108 Anonymous
27th September 2017
Wednesday 1:37 am
26108 spacer
Yeah, I use Firefox with NoScript.
>> No. 26109 Anonymous
27th September 2017
Wednesday 2:42 pm
26109 spacer
>Not to mention those cocking Youtube ads.

If you use the app Newpipe, you don't get any ads. It's a lightweight YT frontend.

As to apps, I use Adaway (needs root) blocks through hosts file I think. Also uBlock origin on Firefox.

Doesn't Brave show you its own ads though?
>> No. 26110 Anonymous
27th September 2017
Wednesday 9:16 pm
26110 spacer
>If you use the app Newpipe, you don't get any ads. It's a lightweight YT frontend.
At least until Google gets monopoly penis envy again and blocks it because of a "broken user experience", which is in no way whatsoever a euphemism for not being able to cream off their ad money.
>> No. 26111 Anonymous
27th September 2017
Wednesday 10:40 pm
26111 spacer
If you want to be really thrifty about it you could use a text-only browser. I've been surprised at how useable it's been when I've been stuck with flaky GPRS on a train or whatever.

>> No. 25953 Anonymous
11th July 2017
Tuesday 1:52 am
25953 Cyber security and Python
Any recommendations for books/resources on cyber security? The recent hackings got me curious, and I have been reading around it since. Something more under the hood type of book for a noive.

Also I picked up Python again. I learn best by doing small projects. Any resources for something like that would be appreciated too.
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>> No. 26097 Anonymous
30th August 2017
Wednesday 8:23 pm
26097 spacer

I'll take both of youse cunts at the same time.
>> No. 26098 Anonymous
30th August 2017
Wednesday 8:49 pm
26098 spacer

Yeah well I'm bringing me brother, and he used to be in the cadets.
>> No. 26099 Anonymous
31st August 2017
Thursday 6:46 pm
26099 spacer
I've had your bro and he's a pussy.
>> No. 26100 Anonymous
31st August 2017
Thursday 9:18 pm
26100 spacer

Yeah well your brother is a female to male tranny and he has a pussy.
>> No. 26101 Anonymous
31st August 2017
Thursday 9:29 pm
26101 spacer
Isn't that a bussy?

>> No. 26068 Anonymous
19th August 2017
Saturday 2:04 pm
26068 spacer
Seriously, what's the most professional code? The first is the coolest but the second is the clearest.

for i in range(1, 101): s = (i % 3 == 0) * 'Fizz' + (i % 5 == 0) * 'Buzz' print(s if s else i)

for i in range(1, 101): s = '' if i % 3 == 0: s += 'Fizz' if i % 5 == 0: s += 'Buzz' if len(s) > 0: print(s) else: print(i)

6 posts omitted. Expand all images.
>> No. 26084 Anonymous
19th August 2017
Saturday 10:28 pm
26084 spacer
No, too many comments can be as bad as none at all. A line or two at the start of each method/function (depending on what you're programming) and then a line or two above any complex logical blocks. You don't need to overdo it.
>> No. 26085 Anonymous
20th August 2017
Sunday 1:20 pm
26085 spacer
No. If used sparingly but judiciously comments can be of immense help for future readers but they're not "free".

Comments act as noise when trying to read code so the value they add must be worth the distraction.

They also require maintenance just like the code does, otherwise they risk drifting from the code they comment. Whoever gets to work on the code next then has to track down whether the comment provides the correct intention but the code is wrong or if the code is correct but the comment's outdated.
>> No. 26086 Anonymous
20th August 2017
Sunday 2:01 pm
26086 spacer

Good code should be fairly self-explanatory. If you're writing a lot of comments, it's usually a sign that your code is overly complex and insufficiently modular. Comments should be the exception rather than the rule, used to mark out gotchas or clarify things that are unavoidably complex.
>> No. 26088 Anonymous
23rd August 2017
Wednesday 1:25 am
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Since any "coolness" is voided by its being fizzbuzz, you may as well opt for complete clarity.
>> No. 26089 Anonymous
23rd August 2017
Wednesday 1:42 am
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You're quite right. If anyone brought me fizzbuzz in an interview I would walk; lack of imagination.

>> No. 26066 Anonymous
19th August 2017
Saturday 12:09 pm
26066 spacer
Hi lads,
As of a few days ago my PC will startup but won't get to the login screen, it'll then restart and get to the loading screen then say scanning disk and then repair, 100% this takes less than a few seconds. After this it takes me to the login screen and everything is fine.
Is one of my HDD's shitting the bed? Something gone wrong in BIOS?
I'm using Win10 if it helps. I've tried googling but since the string search has common phrases I haven't found my problem.

A side note, yesterday I switched my PC off after use, took a shower then came back and switched it back on, this time it booted fine but this morning the "problem" came back. It's not stopping me from using my PC though, but it's obviously not supposed to do that either.

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>> No. 26071 Anonymous
19th August 2017
Saturday 3:11 pm
26071 spacer
Shutting it down, I close everything before doing so since I know it can mess up a shut down.
Also had no power cuts, otherwise the clocks in the house would need resetting.
>> No. 26072 Anonymous
19th August 2017
Saturday 4:18 pm
26072 spacer

The disk check function usually starts up after an unexpected shut down. Sometimes you can get infected with malware which refuses to close properly before shut down, and it's possible that malware's inability to properly close, rather than its needing to be automatically force closed, is being treated by windows as an improper shut down, promoting a disk check.

That's one possibility. I don't know anything about Windows 10, but that sort of thing is common with Windows.
>> No. 26073 Anonymous
19th August 2017
Saturday 4:29 pm
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If windows programs are running I wouldn't have thought it's a problem with the BIOS, but I don't really know what I'm talking about and am only replying to post my own problem.

I've managed to lock myself out of my windows 7 machine with a poorly managed password change. I've found this program, NTpasswd (http://www.pogostick.net/~pnh/ntpasswd), that looks like it'll help but I'm having trouble creating a bootable USB with it. The helpfile says to 'install the bootloader' and gives this command:

j:\syslinux.exe -ma j:

Does this look like the command for a specific operating system? I'm trying to use it with Lubuntu, which isn't working, and am wondering if I use a friends windows machine it might work (different commands and all that).

I'm not too fussed about losing my computer; taking apart the components and learning how to make a new one is pretty fun. I'd just like to recover a few files and websaves I'd made.

Live and learn, make backups often.
>> No. 26074 Anonymous
19th August 2017
Saturday 4:54 pm
26074 spacer
I did that years ago and got by just using the windows installation disc.

I think this is basically how I resolved it:

>> No. 26076 Anonymous
19th August 2017
Saturday 5:38 pm
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Thats great, thank you. I just hope the PC will boot from USB; it seemed to have problems booting from disk, even when altering the BIOS, when I tried to re-install the OS.

>> No. 26043 Anonymous
7th August 2017
Monday 9:07 am
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I'm in the market for some new headphones but I can't decide on which ones. I want to replace my old Audio Technica ATH-AD700s which have finally kicked the bucket after 9 years of use and numerous replacements of the headphone wire (this time the break seems to be somewhere in the middle of the headband, and I can't resolder it without breaking the headphones).

I've been looking at the AKG K702s as a replacement, but are they really worth the £130? It seems to me that the placebo effect and confirmation bias play a pretty big role in the perceived quality of a set of headphones, but I haven't come across any concrete evidence like blind listening tests that would back that idea up. Are human ears even sensitive enough to perceive a difference between something like a well-regarded pair of £30 Superlux 681s and a well-regarded pair of £130 AKG 702s? It's very difficult to tell the marketing dross apart from tangible technical differences.
9 posts and 3 images omitted. Expand all images.
>> No. 26055 Anonymous
11th August 2017
Friday 7:09 pm
26055 spacer
What's the deal with headphone amps/DACs? Apparently some headphones are so hard to drive that you need a dedicated amp to even consider using them.

How much of this audiophile spiel is snake oil and how much of it is legitimate? And even if you do need a good amp, wouldn't a regular stereo receiver do as good of a job as a dedicated headphone amp, particularly on the lower end of the price range? If I'm not mistaken your average stereo receiver doesn't have its own headphone amp, but rather takes the signal from the main amp through resistors and into the headphone circuit. On that basis it seems that the average stereo receiver should be better at driving headphones than the average dedicated headphone amp.
>> No. 26056 Anonymous
11th August 2017
Friday 7:28 pm
26056 spacer

Thanks for the fingerprint lad, BRB stealing your identity.
>> No. 26057 Anonymous
11th August 2017
Friday 8:06 pm
26057 spacer

Stereo receivers usually have a perfectly satisfactory headphone amp, as do most audio interfaces and mixers.

The problem is generally with battery-powered equipment. To save on cost, weight and power consumption, they tend to use a fairly weedy headphone amp IC that is designed for sensitive, low-impedance earbuds. Some of these amplifier chips deliver as little as 25mW peak, but a very large pair of headphones could need as much as 400mW to perform properly at high volume.

The most common symptom of an inadequate headphone amp is poor bass response. Poor transient response is also fairly common and occasionally you'll hear distortion during high-energy sections of audio.

If you're plugging AKG K701s or Beyerdynamic DT990s into a phone, you'll probably want a little FiiO amp to get the best out of them. Otherwise, the benefits of a dedicated headphone amp will be fairly minor.

DACs are an altogether more complicated topic, but diminishing returns kick in fairly quickly here. Some cheap consumer hardware is equipped with a genuinely bad DAC, but you don't have to spend a fortune to get something very good. The difference between a £150 audio interface and a £2000 converter from the likes of Prism or Benchmark is so subtle that 99% of people won't hear any difference.
>> No. 26058 Anonymous
11th August 2017
Friday 8:32 pm
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Have a read through this blog. https://nwavguy.blogspot.co.uk/

He's an electronic/sound engineer who's worked in the industry a long time, he was so fed up with the state of the industry that he started a project to design what he considered the ideal headphone amp and USB DAC, and made the designs open source.
There is a wealth of technical information there on the why and how of headphone amps and DACs, as well as great detail on the problems with a lot of supposedly audiophile level equipment. (He makes a case that a lot of high level kit, rather than just suffering from diminishing returns, actually have many design flaws.)

If it piques your interest, being open source there are a few different people making the amps with a bit of variation between each. Here's a UK maker of them:
And there's this guy in Switzerland making them, the price is higher, especially given the current exchange rate, but it has more customisable inputs and outputs.
>> No. 26059 Anonymous
14th August 2017
Monday 4:46 am
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Thanks for those links, interesting reading.

>Sennheisers are a pale shadow of the headphones they used to be.
I'd have to agree, and it's been that way for 10+ years. I've known good Sennheisers, but the last pair I had felt like cheap plastic toys, and sounded like shit; they cost £80. I was almost happy when they broke after a year or two.

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