In this article I want to talk a bit about the AD/DA converters in my studio. On the left you see again a stripped down version of the studio schematic. You can click it again for a bigger version. You see the analog synthesizers on the left and the analog audio signals coming from them in red going into the AD/DA converters en coming out on the right in green as ADAT. There are two types of AD/DA converters in this picture marked 'ADA8000' and 'Aurora'. I will go more in dept on this equipment further on in this article. But what do these converters do? Well quite simply they convert analog signals to digital and digital signals to analog. As I stated before they all run on 48 Khz, meaning that 48.000 times a second they measure the voltage of the analog signal and translate that into digital numbers that are transferred in 'ones' and 'zeros'. In my setup I only use AD/DA converters that convert to from and to the 8 channel ADAT protocol. But also this could have been SPDIF for example.
In AD/DA converters there is a lot of quality difference. The best converters I have are two Lynx Aurora 16's. They have 16 mono input channels and 16 mono output channels on on the analog side and I inserted two ADAT boards so that is also has 2 ADAT input channels and two ADAT outputs. I use one of them in my analog corner, because especially analog synthesizer have a very wide dynamic range. These aurora's are able to truly capture the spirit of the analog signal without losing the dynamics. They sound terrible accurate. The other one is connected to some of my favorite synthesizers in my Digital Corner. On both I also use some outputs, but I bought them especially for the inputs. One of the things to keep in mind is that these Lynx Aurora converters become very hot. They really need ventilation on the top, so you cannot put them in the middle of a rack between other equipment. In both racks I have them on top for optimal ventilation. You can find more information on these converters on the Lynx Studio website at: http://www.lynxstudio.com/product_detail.asp?i=1
I also use a some Behringer ADA8000 AD/DA converters in my studio. These are much cheaper than the Auroras, but also a bit less in quality off course, though they are really not bad at all. I know a lot of people are prejudiced about Behringer, but they actually make some quite good stuff as well, like the whole 2496 series for example. These converters have only 8 channels in stead of 16 and there is also just one ADAT input and one ADAT output on board. They do a good job in my studio. I have a couple of them in my racks. I use them for synthesizers that I use less often and also for integration of Analog Sound Effects Processors.
I placed all the AD/DA converters as close to the my synthesizers as I possibly could. I also created several islands in the studio for that in the studio with a lower 19 inch rack, with a midi interface and an AD/DA converter in it. In this way I can use the shortest possible analog copper wires for the analog signals and from there I go on with digital signals. The advantage off course is less noise and hum, but also less cable spaghetti :) From the AD/DA converters to the rest of the digital equipment the signals are transported with ADAT over optical fiber. I have patch panel connected as well to every AD/DA converter so I can easily patch equipment to them. And off course everything is neatly labeled so I always know what is what. In the picture you see the Lynx Aurora in my Digital Corner.
27 July 2010
26 July 2010
Apollo Studio Tech (Part 2)
In my Apollo Studio I use a lot of digital audio signals. The advantage of digital audio is that it is free of hum and noise and you can transport it over a long distance. Another advantage is that you can transport multiple channels of audio through a single and and thin wire. In the picture on the left you see one of my racks with some of the digital audio equipment in it like the two RME ADI-648's. In this article I'll explain what the RME ADI-648 does. I will explain the rest of the equipment in later articles. But first a bit about digital audio.
SPDIF is the most commonly known digital audio format. Basically what happens is that instead of an analog low voltage signal, that represents the actual audio signal, the signal is digitized and send over as ones and zeros. So that is just signal or no signal. This process is called AD conversion (Analog to Digital) of course you will need a DA converter (Digital to Analog) converter on the other site again to make an audible signal again. I will talk more about AD/DA conversion in a future posting. SPDIF is used a lot in consumer audio products as well. Most CD or DVD players have a digital output on a Coax (RCA connector, unbalanced copper) or Toslink (optical fiber) connection. SPDIF is usually 44.1 Khz or 48 Khz and transports a stereo signal over a single wire. So SPDIF is actually 2 channels on one wire. There is also a professional equivalent of SPDIF called AES/SBU that is transported usually over balanced connections with XLR connectors. In my studio I only both. Most synthesizers output SPDIF, but most Sound Effect Processors use AES/SBU.
Another digital audio format I use is ADAT. ADAT is transported over Toslink as well. So it looks like SPDIF, but it is definitely not the same. ADAT can go up to 192 Khz and can hold 8 channels of audio on 1 connection (4 x stereo). This is what I like to use over longer distances since it saves a lot of wiring. One fiber connection now in stead of 8 copper wires! Everything in my studio runs on 48 Khz like I explained before. Attached to two RME HDSP MADI interfaces in my audio PC are two RME ADI-648 's. Like the one you can see in the picture on the right. So this is not the audio interface, but only a converter from ADAT to MADI. And so MADI is the third digital audio format I use in my studio. MADI can hold up to 64 channels of audio on a single connection. That can be either a Coax pair with BNC connectors or Optical Fiber pair on SC/PC connectors (The same type that can also used for Gigabit Ethernet). The RME ADI-648 has 8 ADAT inputs and 8 ADAT outputs and these are multiplexed to MADI to go to the RME HSDP MADI interface in my audio PC.
On the left I took the schematic I showed before and stripped everything except the digital audio signals, so you can see them a bit clearer. You can click the picture again for a bigger version. You can see the darker yellow wires connecting the ADI-648 to the PC. That is the MADI connection. (Blue is SPDIF and Green is ADAT). Like I wrote before there are actually two Optical Fibers (a pair) with SC/PC connectors on both sides for the MADI connection. One optical fiber is for input and the other is for the output. There is also on virtual Midi channel transported from the HSDP MADI interface over this fiber to control the RME ADI-648 from a software control panel that is installed on my audio PC. Here you can configure which ADAT port goes to which MADI channels and also the sample rate etc. RME also installs special mixer software with level meters. I use this a lot to play live (not using Sonar to play). It is also very nice to see which synthesizer is on which channel. All in all it gives my a lot of inputs and outputs to work with in my audio PC. 128 to be precise! Everything runs very stable and I love it :)
You can read more on the RME ADI-648 here: http://www.rme-audio.de/en_products_adi_648.php
SPDIF is the most commonly known digital audio format. Basically what happens is that instead of an analog low voltage signal, that represents the actual audio signal, the signal is digitized and send over as ones and zeros. So that is just signal or no signal. This process is called AD conversion (Analog to Digital) of course you will need a DA converter (Digital to Analog) converter on the other site again to make an audible signal again. I will talk more about AD/DA conversion in a future posting. SPDIF is used a lot in consumer audio products as well. Most CD or DVD players have a digital output on a Coax (RCA connector, unbalanced copper) or Toslink (optical fiber) connection. SPDIF is usually 44.1 Khz or 48 Khz and transports a stereo signal over a single wire. So SPDIF is actually 2 channels on one wire. There is also a professional equivalent of SPDIF called AES/SBU that is transported usually over balanced connections with XLR connectors. In my studio I only both. Most synthesizers output SPDIF, but most Sound Effect Processors use AES/SBU.
Another digital audio format I use is ADAT. ADAT is transported over Toslink as well. So it looks like SPDIF, but it is definitely not the same. ADAT can go up to 192 Khz and can hold 8 channels of audio on 1 connection (4 x stereo). This is what I like to use over longer distances since it saves a lot of wiring. One fiber connection now in stead of 8 copper wires! Everything in my studio runs on 48 Khz like I explained before. Attached to two RME HDSP MADI interfaces in my audio PC are two RME ADI-648 's. Like the one you can see in the picture on the right. So this is not the audio interface, but only a converter from ADAT to MADI. And so MADI is the third digital audio format I use in my studio. MADI can hold up to 64 channels of audio on a single connection. That can be either a Coax pair with BNC connectors or Optical Fiber pair on SC/PC connectors (The same type that can also used for Gigabit Ethernet). The RME ADI-648 has 8 ADAT inputs and 8 ADAT outputs and these are multiplexed to MADI to go to the RME HSDP MADI interface in my audio PC.
On the left I took the schematic I showed before and stripped everything except the digital audio signals, so you can see them a bit clearer. You can click the picture again for a bigger version. You can see the darker yellow wires connecting the ADI-648 to the PC. That is the MADI connection. (Blue is SPDIF and Green is ADAT). Like I wrote before there are actually two Optical Fibers (a pair) with SC/PC connectors on both sides for the MADI connection. One optical fiber is for input and the other is for the output. There is also on virtual Midi channel transported from the HSDP MADI interface over this fiber to control the RME ADI-648 from a software control panel that is installed on my audio PC. Here you can configure which ADAT port goes to which MADI channels and also the sample rate etc. RME also installs special mixer software with level meters. I use this a lot to play live (not using Sonar to play). It is also very nice to see which synthesizer is on which channel. All in all it gives my a lot of inputs and outputs to work with in my audio PC. 128 to be precise! Everything runs very stable and I love it :)
You can read more on the RME ADI-648 here: http://www.rme-audio.de/en_products_adi_648.php
25 July 2010
Apollo Studio Tech (Part 1)
A while ago I made a schematic like this for my previous AtmoSphere studio, but lots has changed since then. So last week I made a new schematic for my current Apollo Studio. You can see the main components in my studio and the connections between them. I used different colors to show the different protocols that are used. Please keep in mind that one line doesn't mean it is just one wire. It can represent more connections that all would do the same thing. It is just a logical layout. You can click the picture of the schematic for a larger version. I will post some more articles in the coming period to explain what it all it.
Here already some colors and what they represent:
Here already some colors and what they represent:
- Red - Analog audio
- Blue - Digital audio (SPDIF or AES 2 channels of audio in one fiber)
- Green - ADAT (8 channels of digital audio in one fiber)
- Dark Yellow - MADI (64 channels of digital audio in one fiber pair)
- Purple - Word Clock
- Gray - Midi
- Dark Magenta - USB
- Dark Purple - Firewire
24 July 2010
First WWF Donation from OceanoGraphy Sales
Yesterday I made my first donation to the World Wildlife Fund from the sales of the OceanoGraphy Album. I made an action on the website of the Dutch branch of the WWF and there you could also indicate where the money should be spend on. And in line with the whole idea of the OceanoGraphy concept I selected 'Whales' as the primary target. Well I hope that this will make more people buy the album. I guess every bit helps, so your money is well spend :) Hopefully everyone believes me now as well when I say that I'm donating a cut. I would be even greater to sell ten times as much albums for them and me ;)
21 July 2010
Synth.nl & Ron Boots album coming 9th of October!!
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19 July 2010
Synth.nl with Two Tracks on KlangARTen Podcast #27
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Winnies Schwingungen Party 2010
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18 July 2010
Dutch Masters Sampler CD coming on October 9th 2010
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Apollo Studio Changes
15 July 2010
Apollo Countdown Holding for a While
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Leak still not Found :(
12 July 2010
Synth.nl with Artico played on A Ultima Fronteira Podcast
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Since this radio show is from Spain, I'd like to take this opportunity as well to congratulate Spain with winning the World Cup in soccer.
You can still download the podcast and listen to it from this URL:
http://aultimafronteiraradio.podomatic.com/
11 July 2010
Modular Progress Overview 4
10 July 2010
OceanoGraphy now also on Amazon
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http://www.amazon.com/Oceanography/dp/B003LSXSWA/
If this doesn't work please just search for 'Synth.nl'. More information on the album and also links to other places that sell this Album on this URL:
http://www.synth.nl/OceanoGraphy
07 July 2010
Yamaha SY-2 added to the Collection
06 July 2010
Synth.nl will be present during Norberg Festival
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http://www.norbergfestival.com/
01 July 2010
Synth.nl with Pacifico on Elektroland #110
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http://www.nattefrost.dk/elektroland/playlist.htm
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