Archive for the ‘Tech’ Category

As I’ve mention before, I’ve pretty much been unable to think about anything other than sound systems for the past few weeks. As such I’ve spent time re-searching them lots and trying to work out what I want if I suddenly find myself with like £3,000 and have to spend it on a sound system for some reason rather than using the money productively.

I say ultimate, it could be even more powerful and I’m sure nightclubs have more powerful systems. However I’m fairly sure that this is more powerful than some bars and indeed even clubs in Leeds have. Not bad for a bedroom system :D. Before I talk about my current design problems, I’ll let you have a look.

First off, the monitor is crap. It’s a floor monitor, a good one but for a DJ booth it’s probably not the best choice. Also, if the monitor is being used for a band, there is only one monitor for everyone rather than one monitor each.

Secondly, this presumes that if you connect two speakers to one amplifier channel, while it reduces the impedance and so increases the power, the power will be split between the speakers. If this is not the case the speakers could be overloaded. It is also the case with the sub-woofers that the amp is actually under powered.

Thirdly, the crossover which is before the sub-woofer amplifiers maybe unnessecarry given the other parts of the audio signal in the crossover are not being used. I don’t know if putting it in will actually have a negative effect as it means the sub-woofers will only be getting fed bass though most of them can do a larger range than that. If taken out the sub-woofers could be done in stereo rather than mono as they currently are.

Other concerns and general notes are there is no digital effects processor. I looked into putting one in but there didn’t really seem much point. Maybe there is, I’m open to the idea. Also there are no microphone pre-amplifiers which isn’t really needed given the mixing deck has mic pre-amps but it might boost quality a little. The equipment on the whole is a bit crap. A better DJ deck with XRL outputs would be good. There is no CD players and while the laptops can play CDs, DJs may prefer seperate CD players.

Finally, in terms of expansion, you could daisy chain several speaker stacks. If you got two distribution amplifiers and sent all the left channels to one and all the right channels to another you could have two identical speaker stacks acting in stereo with each other which would also take the power from 4.2kW to 8.4kW plus whatever the booth monitors output.

I promised a while back that I would post pictures of the PA system I got for Rationalist Week. Now I’ve finally got my phone transfering Bluetooth files again here they are. The first two are obviously one of the speakers (with a 500ml coke bottle for size reference) and the other two are the mixing deck and amplifier.

EMI and Apple have just announced a new edition to their offerings – EMI’s entire catalog will now be offered DRM free. For $.129 a track (opposed to the classic $0.99 which is still available) you get your tracks at 256kbps rather than 128kbps and DRM free though they will still be in AAC format.

This is one step closer to making buying music online a good alternative to buying the actual CD, indeed it’s by far the biggest one. You will now be able to move music between devices which was the major problem and it also solves the licences problem (losing them) as you can back up all your music without any problems.

I need a bigger credit limit! Whenever I want to buy a large purcahse on my credit card I have to move money over to my credit card. Looking back, I should have probably just bought it with my debit card and given up on the cash back. But anyway, it takes 3 working days for the money to clear – let’s count that. Today is Friday, Saturday, Sunday, Monday and we’re on day one, Tuesday day two, Wednesday it should finally be in there. That’s like a week from now!

If I wasn’t using online banking it would be sooooooooooooo much faster. I would simply go down to my account and draw the money out and go to the other bank or whatever and pay it in and it would be available instantly. But because I’m using debit card payments and electronic fund transfers (more usually) it takes forever to do anything. I mean 3 working days! Why do computers need the weekend off?!?

It actually is a 6 days. I say it’s Friday, it’s currently Thursday night for me but if you don’t get it sorted before 2pm it’s actually 4 working days which is why it’s effectively Friday in terms of timing. But in my time it’s going to be 6 days. I don’t even seem to be able to change my mind about transfering the money now.

Apparently my desktop didn’t take heed when I posted about DST. I thought I was going to get to bed a little after 3 and get in a good 8 hours – I’ve been robbed! My computer hasn’t re-adjusted itself automatically! Windows 95 could do that!

Seriously though, there is something wrong with Dell computers and telling the time. My desktop will sycronise itself and then within a few days it will be a minute or two out again. It’s turned on all the time so it’s not like it’s without power or even turned off but it can’t hold the time. Nor does it apparently know when DST changes happen as it’s set to automatically update with DST changes.

Everyone loves open source. Everyone being most of the hippies in SoC. Many people don’t. But that is besides the point. It’s being hailed as the next great shift or whatever, many people argue that everything should be open source. I recently ran into a major problem while thinking about this model however.

The bottom line is, proprietary software makes more money than open source. Yes you can sell support licences on top of that, it’s seperate from the product and indeed even Microsoft sell support licences on top of their proprietary products. It doesn’t make the money. Selling the software makes the money. And you can’t do this effectively with GPL open source.

So what, the corporations are just generating huge profits and can lose a bit of money anyway right? Well, take for example office software. Microsoft put $6,000,000,000 into research and development. That’s not just for office but that’s a massive figure – six billion dollars per year go into R&D. That is money spent on making their product better.

Do you think OpenOffice.org are putting those kind of resources in? Of course not, they don’t have those kind of resources. What OpenOffice.org have done is produced a clone, a bad clone, of MS Office. But without the money invested into R&D by Microsoft they wouldn’t have a fantastic office suite to make a clone of. They rely on the investment made by Microsoft in order to clone it for their open source version.

If everything was open source, who is going to be providing these kind of resources?

SATA or Serial ATA is what most hard drives are moving towards these days. While the technical details differ them from the traditional IDE drives the main thing you need to know is that they have smaller cables and so are a lot less fiddly.

Other than the cable going to a different point though it’s much like installing an IDE hard drive. Once you’ve grounded yourself you want to slot the hard drive into a drive bay and screw it in place.

Secondly find a spare power cable running from the power unit and connect that to the back of the hard drive.

Finally you need to connect your SATA cable. SATA cables are small and thin with little flat connectors at the end. Connect one end to the bottom of your hard drive and the other end goes directly onto your motherboard. These vary in location depending on your motherboard so have a check around.

Once it’s in, put everything back together and boot your computer up. If the computer doesn’t recognise it you may need to get software from your hardware manufacturer to pick it up (though it should pick it up automatically).

Unpack the RAM (random access memory) and check with the motherboard’s manual to work out which is the first slot (slot 0). When you insert the memory you want to fill it up numerically: 0, 1, 2, and so on.

To insert the memory push the white clips at the end outwards then simply slot in the memory sticks into the slots. The clips will automatically lock back into place when you have pushed the memory stick far enough into the slot.

Something that is weird and doesn’t make sense is the idea of crossover cables. Ok, they do make sense but I’m not going to get into that here. Crossover cables are just like regular network cables except, and here is the surprisingly bit, the wires inside them are crossed over.

When to use them

Crossover cables are used when you are linking two computers directly. When using hubs, switches, routers, etc you want regular network cables but if you are linking two computers from one network port to the other you need a crossover cable.

Alternatives

Of course one problem is if you have just wired everything up and taken up half the carpets in your house. Putting a new cable in doesn’t sound like something you will be wanting to do any time soon.

There are two ways to work round this (you could also buy a network hub but that’s expensive and pointless so I won’t be covering that solution). The first is to get a connector and stick two crossover cables together, so the wires crossover twice and therefore cancel each other out.

The second solution is to get a connector that does this for you. You plug one end of the connector into your computer and the other end has a port to slot your regular network cable into. It’s just like a little box that does the crossover for you.

PCI cards are easy to install. The first thing you obviously need to do is turn everything off, unscrew your case and remove it so you can get in. Your PCI slots will be near the pack of the unit, and will be brown ports (usually). You will have anywhere from three to six.

Next you want to push out the panel on the back of your computer. They put these metal strips on so that you don’t have a hole in the back of your computer when you don’t have a PCI card in there. Keep this safe somewhere as you will need it again if you ever take the PCI card out.

Now get your PCI card and insert it into the spot. Push it firmly until it lines up, you will notice the metal strip end will replace the area where the old metal strip you pushed out used to be.

Once it’s in place and fits nicely lining up with the edge of the case you want to screw the metal strip into place so that it can’t move. Now close your case and switch your PCI back on. Chances are it will be picked up automatically but if not go to install new hardware or use whatever software you were supplied with.