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10/09/2005

Lord of the DACs

OK, I don't know if I've mentioned it before, but I've got a Chaintech AV710. It's one of those soundcards that has nothing on board but a magnificent (prosumer) Envy24HT Audio controller and 24-bit Wolfson DAC. These things aren't your ordinary sound card thingies. They're prosumer! You can get close to 100dB dynamic range out of em (CD quality is 96dB, and most sound cards aren't good enough to play that back clearly). It's impressive, considering that I dropped less than $100 on em. I wanted a Terratec Sky or Space or whatever, but they don't supply stuff in this country, and it would've cost me $400 or so to import it. It comes with Aureal or EAX or whatever 3D audio stuff is needed to make games run fast (unlike the Chaintech), but the main priority was the high quality DAC and controller. Actually, I'm not so sure you can get the Chaintech here either. A friend of mine got a bunch from overseas in case some friends wanted some.

Anyway, it's a good soundcard, but I was as yet unable to get it working in Linux, for a variety of reasons (driver support's only been recent, and there's a shitload of options with no clear way to turn on the DAC). See, the Chaintech's got an "interesting" setup. To save space on the back of the card, they've had to combine the rear channels (the extra 2 from the 7.1) to a line in or something. Point being, it's not just some ordinary channel, you've got to "do stuff" to enable it, and since it's in and out, there's no clear way to do this with linux.

To complicate matters, recent driver changes in the kernel didn't actually initialise the Wolfson DAC, because the driver's shared with a bunch of Envy24 based cards, and most don't have the odd setup. Anyway, point is, I patched my kernel but still no dice, mainly because I couldn't find what option to turn on, and the saved state files didn't work. I downloaded an updated state file, and figured what I'd been doing wrong.

You have to set "Record" to "on" in "Capture". See, "Capture" is the volume control for the rear speakers, because it's also Line in. Switch that on and turn your IEC958 0/1 channels to H/W in 0/1 and you're laughing! It sounds really good. I almost want to cry. I've wanted this kind of sound since you guys got me the Sennheisers for my 18th. :)
 Comments (6)
I've always had issues with soundcards. Granted, all my problems with them were back in the days of IRQ conflicts and trying to figure out what settings to use for the soundsetup program for any random DOS game, but I'll always be a little wary of them.

What interests me is that, on the basic consumer level, there isn't anywhere for soundcards to improve. I would imagine that even among PC hardware enthusiasts, people who spend hours comparing benchmarks and spend large amounts of money on upgrades, the majority would still be using their onboard soundcard.
 
I agree. Even sound quality is not an issue considering the microstack. Feed digital data in and you have a high quality DAC on board. The major room for improvement is if you're recording stuff. You need low latency, high quality ADCs, Good sync, multiple input channels, isolated / matched inputs (or whatever they're called), etc. Some sound cards that do this well cost about $4000, and they only cost that much because ordinary people don't need to record stuff.

I have a suspicion that mine would be awfully good at recording, but it's only a total guess, I haven't actually tried, and wouldn't know how to measure it anyway.

In addition, there's also significant room for DSPs. They need to start doing a lot more in real time systems, and again with low latency. The big problem is that people don't understand the importance of sound, so you don't have much competition, and the company that makes the most money does so because it makes really crappy, cheap equipment.
 
I was thinking about getting one of the USB M-Audio devices earlier for the powerbook, but in the end I just stuck with on board sound. I have been buying a lot of headphones though, my latest purchase was the Sennheiser HD280 Pro, one of my friend's parents went to the US and collected a delivery for them there. It worked out to be maybe a bit less than half of the local retail price?

I have to stop buying headphones, at least this one should be the last sealed set I'll get for a while, next would be a high end in ear monitor.

With low latency recording, wouldn't you need a half decent OS to be able to hand it properly.

Does anyone have experience with MIDI keyboards?
 
Besides the 20 minutes I got to play with one during a class for Music in year 8? No.
 
Do you record stuff? It's the only reason I can think of to get monitors and a MIDI keyboard.
 
I was thinking of buying a keyboard for someone, buying a piano isn't realistic, but there seems to be some very nice keyboards.

I don't record stuff, but I want to decent quality sound on trains and to have that without damaging my hearing.

Have you looked at in ear monitors before? They're great when you're in a noisy environments.
 

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