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Geek on Sound (or.. does anyone really need a sound card these days?)

July 14, 2014 by journeymangeek. 0 comments

These days, most PCs come with sound cards that are good enough for most purposes. Speakers have gotten generic enough that shopping for a good pair, with something to differentiate them, isn’t that easy. In a sense, if you aren’t massively picky, you aren’t going to  look very hard or far, since what you have is probably good enough.

 

Output devices

I’d start by saying that sound is subjective – different people expect different things from their sound system, and look at different things. A pretty good idea when actually trying to put together gear for sound output is to decide what you’re going to do, and what you expect from your sound gear. Different folk expect different things – some value bass over all else (in which case, you’d want a pretty powerful subwoofer, or bass oriented headphones), while other want a neutral sound.

 

An ideal sound system sounds exactly like what its source material sounds like. Practically, its pretty hard to make a device that records the entire range of human hearing (ideally from 20 – 20,000 hz). Your mic locations and types make a difference. The recorded material might also be changed in storage (for example, if it’s converted to an MP3), and by the output devices. In some cases, distortion can be pleasing (as vinyl and tube enthusiasts will tell you). In short, an ideal sound playback system is impossible. At the end of the day, rather than perfect fidelity, a realistic goal is simply a system you are happy with.

 

In most cases, unless you’re on the loony fringe of audiophilia, the component closest to your ears is probably the most crucial part of your setup. It’s going to determine what you have behind it and whether you get the most out of it. (I doubt you can get very good sound from a home-made monstrosity of tin cans, cellophane and magnet wire ripped out from alternators, even with the world’s best amplifier behind it!)

 

At the most basic level, everyone has speakers somewhere these days – most modern monitors have a tiny pair hidden away somewhere, as do laptops. One step above that would be the good old stereo speakers. These are perfectly adequate for transforming an electrical signal into sound. I use a pair of old Altec Lansings for gaming and system sounds, but I’d do just as well with my monitor’s built in speakers in many cases. These speakers probably are museum pieces- they possibly predate front panel audio, but they’re solid, well made and sound surprisingly good.

IMG_1071 (Mobile)

 

 

 

 

 

 

 

 

If you need more bass, a subwoofer, as part of a 2.1 speaker set would give you that rumble; however, if you have small animals at home, be warned it may frighten them. Hardcore gamers might look at surround sound speakers – ones with more speakers such as 5.1 sets split sound into more channels you can position for more immersive sound.

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Monitors are a step up  in terms of sound quality- these are full range speakers which are often used to monitor (hence the name) recordings. They often offer a full range of frequencies (that’s to say they cover the ranges subwoofers do as well – not all speakers do), and are significantly better quality than most regular PC speakers in most respects. They also tend to be larger, but not absurdly large, and contain their own internal amplifiers.  They do tend to be slightly harder to find(As with a lot of my audio gear, I find that music shops rather than computer shops are the best place to find these), but are a great option if you want good sound in small spaces.

SPav40_front

 

 

 

 

 

 

Of course, there’s nothing stopping you from plugging in your PC to an amplifier or receiver, and running a regular pair of speakers off it. Lots of people use their PCs as you would any other source with great results.

 

Personally, I favour headphones. They’re generally cheaper (with some exceptions), some of them offer decent or even spectacular sound quality and, are good if you’re primarily listening to music or gaming alone. There’s a vast array of different types, but there’s two main things to be aware of.

 

Firstly the ‘form factor’ of the headphones – ranging from simple earbuds, to In Ear Monitors or IEMs, which go into the ear canal to earphones that fit on your ear to circumaural (headphones that sit around your ear) and circumaural (headphones that sit on your ear). The second is the design of the phones, such as the driver design. IEMs can be dynamic, or use balanced armatures, headphones are mostly dynamic, but there’s alternate designs with their own fans. Headphones can be open-backed (which sound more natural, but often have less bass, and leak noise) or closed back (better isolation, more bass). Quite often, listening to a pair of headphones is the only way to be sure!

 

In some cases your speakers and headphones may be too demanding for your onboard sound card to drive, or have the wrong interfaces, so it’s useful to know what you have. Many monitors may take in 1/4 inch inputs or RCA, which your regular sound card may not have, and some headphones need a more powerful output than your regular sound card can handle. A good rule of thumb here would be the impedance level, and that most soundcards can handle up to 32 Ω (ohm) headphones with no issues. Impedance is a hugely complicated thing, and for our purposes, just note that you just don’t want to run a high impedance headphone off a regular sound card.

 

In the next part, we’ll talk about options for feeding your output devices, and when a regular sound card just doesn’t cut it.

 

Part 2: Feeding your speakers or headphones the good stuff

 

As with your output devices, different people expect different things from their sources. By a ‘source’, I really mean “device that feeds sound into your sound system so you hear things” – traditionally this could have been a DVD player or even some flavour of a tape player. Associated with that would be the amplification stage of things.

 

In the context of what you’re likely to run into, we can really classify 3 types of sources.

 

Firstly, the traditional sound card and your integrated sound devices. Integrated sound devices usually are designed around providing the bare minimum of outputs at the lowest cost. While there’s some motherboards with fancy features, in most cases you’d have 5 channel sound and S/PDIF. While soundcards are similar, since basic features have been commodified; these often offer better headphone amplification stages, more options, and ostensibly better sound chips. If you’re a gamer, soundcards are likely the best option, since they’re built around gaming needs, such as surround sound. Creative seem to have gotten their drivers in order these days and make really nice sound cards, including models that work with recent phones, and Asus Xonar is pretty well known.  You’re likely going to need a spare PCI or PCIe (Most modern sound cards use a PCIe 1x connector) slot for an internal card, or spare USB port. While typically these are one slot card, there are occationally 2 slot cards with additiona features – such as this creative zxr

zxr

 

 

 

 

 

 

 

The second is the DAC or digital audio converter. These are units used by audiophiles which usually do purely output and either have a headphone out, or can be connected to an amplifier. These tend to be somewhat expensive, you’ll need to do your research but in many cases should offer the best sound quality for music. These are usually connected to your PC via USB and are detected as a soundcard. These tend to be expensive (though prices have been dropping), and as with any audiophile grade equipment, you can’t always trust reviews. Do lots of research, and check out as many reviews you can. If you can, many shops that sell this sort of  gear have display models you can audition. These are occationally homebrew units or kits, though there’s pre-built ones with great build quality. I’d note though, some companies make a hash of perfectly good sound chips so do your homework before you invest in one of these. These are in effect very fancy soundcards.

 

The third is the DAW or Digital Audio Workstation – these are basically DAC-type devices with better inputs – I use one of these for playback, and if you do your homework, it offers good sound quality, often at lower prices.  They’re pretty good if you want to use proper mics, or want something that can output to RCA – my music playing setup is built around a relatively inexpensive, rather old M Audio Fast Track, so I obviously believe this is a good option. Its got a decent headphone output, RCA out if you want to connect to an amplifier or monitors, and a proper mic and guitar/direct input

rtaImage

 

 

 

 

 

 

There’s devices that straddle lines – there’s headphone amplifiers that work as a DAC/microphone for phones for example, or dedicated amplifiers and so on – so I may not cover the whole spectrum of things you may come across

As with your output devices, what you have might be perfectly adequate, and there’s usually no need for fancy, extremely expensive audiophile gear in most cases. I found that the most sensible reason for a sound device outside your onboard sound card was really your inputs and outputs. I got a DAW cause I needed proper XLR microphone ports for music (and it turned out, it sounded better than my onboard sound card for music).

I’ve chosen to have an amplifier between my source and my headphones. This is pretty much optional, but if you have more demanding headphones or want to use speakers not actually designed for a PC, it can be worthwhile upgrade. It’s useful to know what inputs your amplifier takes in (mine does 3.5mm and RCA) and what your soundcard does. In general, you’re not going to need an amplifier except for very special circumstances, and you will know when that is – high impedance headphones, and regular unpowered speakers come to mind. While there’s a slight improvement to sound quality in my opinion, the big difference is in convenience – I have two inputs for my amplifier so I can switch between my PC (where I game) and my laptop with a flick of a switch, and have a large, physical volume control.  Its a sAPII made by a  chinese company called SMSL which I bought on a whim.

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Finally of course, you need to get sound to your system – games would do it pretty naturally, but there’s a few tips and tricks for music I use, which I’ll cover in the concluding part.

Part 3: If music is the food of love (of music?), play on!

 

From parts 1 and 2, it’s rather obvious that I believe that in most cases, your standard sound setup is good enough. I am rather picky about music however, and try to get the best, least-coloured sound out of my system as possible. I also want my music player to stay out of my way.

 

Like a lot of audiophiles, I’m a fan of foobar2000 – there’s alternatives of various sorts such as lilith on windows but I find that a nearly stock foobar2000 setup works best for me.

 

I do choose to use bit-perfect playback where possible – originally through ASIO, and later with WASAPI (there’s a third option of kernel streaming). All these methods bypass the kernel mixer which I find, subjectively, improves sound quality – (http://wiki.hydrogenaudio.org/index.php?title=Bypassing_Windows_Mixer“>Hydrogen Audio disagrees though: if some driver uses bad compression and EQ presets, the difference from bit perfect playback can be dramatic). Once again, I find experimenting to be the best option here – you may not hear a difference here. Since I use seperate sound devices for music and other stuff, I simply set my DAW into WASAPI exclusive mode, so that gets a stream of music, while the onboard sound card handles other sounds.

 

At some point, tweaking your software is a little like trying to overclock – you might get some improvement, real or perceived, but it isn’t going to make a major difference if you’re working off hardware that’s not really very good.

 

I also favour lossless – http://www.codinghorror.com/blog/2012/06/concluding-the-great-mp3-bitrate-experiment.html“>Jeff Atwood disagrees, but these days, storage space is cheap. I have the option of re-converting my audio with no quality loss. While dbpoweramp is what I hear rave reviews about as far as ripping CDs go, I favour http://www.cuetools.net/wiki/Main_Page“>cuetools – it supports some of the same features, is free  and does GPU accelerated ripping.

 

Once again, your mileage may vary. Lots of people swear by Winamp, or just listen to music off YouTube or Spotify. It’s pretty unlikely you’ll need a fancy setup for that. Built up to your needs, and your preferences. I personally pretty much accidentally discovered my preferences, and bought my initial audiophile gear and upgraded as things broke or I wanted to experiment.  Nearly my whole setup consists of iterations of settings and gear until it sounded right. I’ve made one or two mistakes of course, but the current iteration sounds pretty good, and handles what I throw at it. I don’t tweak my sound for gaming – I’ve not seen much options, and if you’re familiar with how to tweak a computer for better gaming sound, why not write an article for the Super User Blog!

WTFriday: http://2915189091

February 10, 2012 by Tom Wijsman. 7 comments

Have you ever heard of a link like http://2915189091? Don’t worry, not a shock site…

While this does not always work in every browser (eg. some versions of Firefox), it does work in most browsers like MSIE and Google Chrome. It really depends on the implementation of how the URL is parsed, Firefox seems to not go beyond our usual ways to type a URL.

This is all about how the URL is stored. Many of you know that you can also access Google through their IP, eg. http://173.194.65.99. Now let’s see how much data storage that IP requires. As one character is 1 byte for ASCII, it takes 13 bytes to store the IP address. Or with Unicode (UTF-16) you will need the double, 26 bytes. Another way to store the IP is by taking each number and storing that apart, resulting in unsigned octets from 0 to 255 which each take a single byte, so that totals out at 4 bytes.

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Video Conversion done right: Codecs and Software

November 7, 2011 by slhck. 8 comments

Videos are everywhere. They come in quite a few different formats – all with their own advantages and disadvantages. Converting videos from one format to another is a very simple task, given the right tools. In this post, we will go through the most popular video codecs and the software you need to get the best results.

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5 Ways of Finding the Right Power Supply

September 28, 2011 by berk98. 4 comments

Selecting the right power supply is often the last thing people think about when building a computer. However, it is something that deserves substantial consideration. Although spending more on a quality power supply won’t increase your computer’s performance, it would be one of your best investments, because a power supply failure can take the rest of your computer with it. Furthermore, a decent unit will not need to be replaced when newer parts are installed in your computer.

1: Do your research

Power supply quality varies greatly among manufacturers, and even among units from the same manufacturer. Determine the company who actually manufactured the unit, rather than the company who put their brand on it, and make sure they are a reliable company. For example, Corsair units are usually made by either Seasonic or Channel Well, who both make decent units. On the other hand, Allied units which come with some computer cases are made by Solytech, who has been known to make ticking time bombs. This information is usually available by looking up the UL certification number, but often times more research is necessary.

Low-Quality Power Supply with Yellow PCB

Another way to determine power supply quality is from opening the unit up. Quality units will have a green PCB, rather than a beige-yellow one (pictured above). They also have quality capacitors rated for high temperatures, and dedicated protection circuitry. Although the average computer probably isn’t inclined to void their warranty, many power supply reviews contain teardown pictures, as well as expert opinions.

In either case, Tom’s Hardware published a great article with information on how to determine your unit’s quality, as well as a table of manufacturers. It is a great resource for determining power supply quality, and a good read.

http://www.tomshardware.com/reviews/power-supply-oem-manufacturer,2913.html

Quality Fan Grille compared with Cheap one

Finally, the power supply’s fan grille is a good indication of quality. A fan grille stamped out of metal is a good indication that corners have been cut, since it is the cheapest style of fan grille. The left fan grille pictured above is a quality unit, while the right one is a cheap model.

2: Find a power supply with the 80 Plus designation

80 Plus 80 Plus Bronze 80 Plus Silver 80 Plus Gold 80 Plus Platinum

Even if power consumption from the wall isn’t much of a consideration, the lost energy is turned to heat, necessitating higher velocity fans, resulting in a louder unit. Power supplies bearing the 80 Plus designation and logo have been tested by an independent company who ensures the power supply meets efficiency requirements (80% efficiency at 20%, 50%, and 100% load).

Multiple ratings exist for better efficiencies, although there is little difference between designations. Higher ratings can indicate newer/better units, such as the 80 Plus bronze/silver rated Corsair HX series from 2009, compared to the 80 Plus gold rated Corsair AX series from 2011.

3: Avoid power supplies with multiple 12v rails.

These rails are usually just separate over-current protection units operating from the same 12v source. While they don’t necessarily decrease the efficiency of the power supply, they do make it more difficult to access the 12v current.

OCZ 4-rail unit label

For example, the OCZ600SXS unit is a quad-rail design (pictured above), with two rails to each half of an EPS12v (2×4 pin) CPU connector, one rail to the PCI-e, and one to the motherboard/peripherals. This means that if it were used on a motherboard with an ATX12v (2×2 pin) CPU connector, an entire rail would be lost. Furthermore, even if a very power-efficient CPU (such as a Core i5-2390T) were used, high end graphics cards and multiple graphics card setups could have trouble getting sufficient power.

While most multiple rail power supplies only have two or three rails, it can still prove to be problematic, particularly if one peripheral (such as a graphics card) draws significantly more power than the rest of the system.

4: Read the label!

Checking the power supply wattage is not enough. Make sure that most of the current is available from the 12v output. Modern systems draw the most power from the 12v line. Since this wasn’t always the case, many older designs provide most of the power on the 5v or 3.3v lines, which does no good for modern systems.

For example, consider a Logisys PS480E12 480W power supply, and a Thermaltake TR-380P 380w power supply. While the Logisys unit is rated at a much higher wattage, its 12v current rating is just 16A, whereas the Thermaltake 12v rating is 30A. Therefore, despite the lower power rating, the Thermaltake unit is much better suited for modern computers.

5: Buy a power supply sufficient for your needs, and no more.

Although the market is flooded with high current power supplies, you might be surprised at how little power your computer requires (A quad-core i5-2400 and GTS 450 can require as little as 300 watts).

Furthermore, efficiency of power supplies significantly drops under light use, which is why 80 Plus power supplies aren’t rated for less than 20% loads. While the increase in power consumption may be minimal, higher-wattage power supplies will still get hotter, necessitating more airflow.

OuterVision eXtreme publishes an extensive power supply calculator utility for free, which can give you a great idea of how much power your system needs. The paid version will also tell you how much current on each voltage you should look for.

Feel free to plan for future upgrades. But if you don’t expect to be running large hard drive arrays or multiple graphics cards, don’t waste your money on an overly powerful power supply.

eXtreme PSU Calculator: http://extreme.outervision.com/PSUEngine

Customizing Your Bash Command Prompt

September 21, 2011 by danielbeck. 7 comments

When you’re working on your Linux or Mac OS X system’s command line, the prompt is the text to the left of the commands you enter. The default prompt varies for every system, but it usually gives you an indication of your username, your machine’s host name and your current working directory. Also, it ends with a dollar sign $ if you’re working as a normal user. If you’re working with root privileges, it ends with # instead.

The prompt can be customized to include relevant information that can help you increase productivity, to hide information you don’t care about, or to highlight the lines in your terminal output where you entered commands.

This post will show how to customize your bash prompt, and, in the process, explain a few of its more advanced features that improve your productivity. Bash is the default shell on Mac OS X, available for all (or most) Linux distributions, if not already included, and available on Windows via Cygwin.

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It’s Saturday night: Do you know where your Laptop is?

August 24, 2011 by jcrawfordor. 4 comments

Say you take your laptop to the coffee shop with you.  You walk away to get your drink, and when you turn around it’s gone. This happens all the time, opportunistic thieves see an untethered laptop and just grab and run. Other times, they’ll break in to a car and steal the contents, including your computer. According to one study, one in ten laptops will ultimately be stolen. The thief now has not just your laptop, but your data – and increasingly often, they’re using it to get to your identity.

nhinkle included some tips on preventing laptop theft in his series on college computing. In this article I’ll present some tools that can help you get a stolen laptop back.

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