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| | #1 |
| Registered User Joined: Apr 2006
Posts: 102
Thread Starter | D to A then back to D why? how?
Hello this is my first post. Hope its not a loaded question folks. Just reading a Bob Katz book and maybe I should finish the book first but how is this done? You would output say from PC to tape? then record back to PC just to get that elusive ANALOG sound? Just wondering if that is the idea. thanks |
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| | #2 | |
| Moderator Joined: Dec 2002
Posts: 3,389
Verified Member | Quote:
How? With the best set of converters you can afford. The DAC that feeds the analog chain is just as important as your monitoring DAC, if not more. And you need an excellent A to D to get back to digital while preserving all that nice analog work you just did. | |
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| | #3 |
| Registered User Joined: Apr 2006
Posts: 102
Thread Starter |
hey thanks alot that makes sense. I do everything in the DAW world so i was confused when I read this. thanks again
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| | #4 | |
| Gear addict Joined: Jul 2005 Location: NYC
Posts: 426
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www.arfdigital.com | |
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| | #5 | |
| Gear Guru Joined: Dec 2002 Location: Columbus, Ohio
Posts: 12,407
Verified Member | Quote:
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| | #6 | |
| Lives for gear Joined: Apr 2006 Location: Toronto
Posts: 808
Verified Member | Quote:
My question and concern would be that since most audio being mastered needs to have some digital processing after the DAC, possibly eq, or maybe just a gain change and almost always some kind of a peak limiter, wouldn't that be better accomplished at the same sample rate as the session and then lastly SRC to 16b/44.1k? I'm asking because I just bought a Lavry 3000s real time SRC and that is how I planned to use it. However, it sounds like you are saying that going into my LavryGold ADC at 16b/44.1k, followed by whatever digital processing is needed would sound better because there would be no SRC. I'd be interested in comments on this. Thanks, Andy, Silverbirch Productions. | |
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| | #7 | |
| Moderator Joined: Dec 2002
Posts: 3,389
Verified Member | Quote:
However, with something like the Lavry 3000, I wouldn't worry too much about the SRC. That's certainly one of the finest available. I used one for a couple years when DC and I worked together. Doing your A to D at 96k, following that with digital limiting also at 96k, and then using the Lavry 3000 to SRC to 44.1 (but still 24 bit - don't reduce bit depth to 16 'til you're making the DDP or CD from your DAW) could offer an advantage, especially with certain limiters. Some of the artifacts (distortion from nonlinear processes like compression and limiting) will actually be filtered out at the time of SRC and you may actually see an improvement. This won't necessarily work with any old cheap SRC however, and YMMV depending on your exact gear and application. However, this is worth trying. If you have a Weiss EQ or limiter, staying at 96k in the chain will prevent the internal upsample/dpwnsample as well, and this could conceivably offer an advantage since you will only have one SRC at the end. There are many variables as you can see. It's hard to make sweeping generalizations, but there are several things to recommend both approaches in certain cases, so see what works best with your chain and your workflow. I use both techniques at different times. | |
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| | #8 | |
| Lives for gear Joined: Apr 2006 Location: Toronto
Posts: 808
Verified Member | Quote:
Thanks for your very thoughtful response. Normally, I would just try these variations myself but I'm a bit boxed in at the moment. Although every piece of outboard gear in my studio is top of the line pro mastering caliber, I'm still using Pro Tools HD and Mac OSX, but only to play and record. I don't have any issues with the sound of the HD system but the software does not allow recording multiple sample rates into the same session and therefore if I'm mastering a 24b/96k session and recording back in to PTs, it has to remain at the same rate. I do have the option to dither on the way back in, of course, but that's it. With this set-up, I can only sample rate convert with software and the Lavry 3000s will remain in its box until I decide to either replace the computer and software with something that will allow me to SRC in real time or until I decide to get a 2nd computer to record into. In fact, I probably wouldn't have bought the 3000s at the moment except that by buying it, a round trip of Gold and the DA 10 I got a great price and could not resist! So now, I have to figure out the best way to implement this fine looking unit. I have refined my version of the PTs software, except for writing CDs (Waveburner as a sequencing//writing program works fine for me), and have tricked it into thinking it is mastering software. However, now I can see that I have pushed it as far as it can go, at least if I want to get into the subtleties of real time SRC! Andy, Silverbirch Productions. | |
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| | #9 | |
| Mastering Joined: Mar 2006
Posts: 3,099
| Quote:
Which is not always a GOOD thing. D/A/D is a losssy process just as much as an SRC. There's been an interesting progression in digital technology and in converter technology over the past 20 years. In the beginning, a D/A/D chain was far better-sounding (and more transparent) than the earliest SRCs that were available. As the years progressed, the SRCs beat the sound of a D/A/D. This transition occurred around 2000 or so with the advent of the Weiss and DCS SRC boxes. Now, it's coming around again, as D/A and A/D converters have gotten audibly better, the classic idea that a D/A/D chain is very lossy has gotten to be less of a problem, and now a top-notch D/A/D chain can give a good SRC a run for the money, but let's get into more detail on what that means. Both SRC and D/A/D involve requantizing. You'll find many engineers, including me, who've done the tests and it can be shown that a modern-day SRC (on the order of a Weiss) is more transparent sonically than going D/A/D, even with the world's best D/A/D chain. If the ONLY thing you are doing is trying to accomplish a transparent SRC with no other processing, then objectively (and subjectively) then I recommend an SRC on the order of Weiss or R8Brain, DCS, and a couple of others. However, if you are needing to analog process, or looking for a slight or strong coloration, and if the slight coloration of the D/A/D chain sounds better to you, then an excellent D/A/D chain does a very nice job and may subjectively sound better to you than the SRC (though less transparent). For example.... For some reason (probably having to do with euphonic distortion), over here, patching through the HEDD (process bypassed) and a pair of Trakkers (process bypassed) seems to widen the sound and make it slightly warmer. Sometimes this warmth (or loss of transparency, if you will) is very attractive, and sometimes it's not. I have to make that decision individually for each project I do. But that D/A/D path is definitely not "transparent", it's just a "nice-sounding and desirable analog chain". To my listening tests (and many other mastering engineers will agree with me) there is no D/A/D chain that's audibly as transparent as a Weiss or DCS SRC. So don't denigrate a good digital SRC; the best of them are far more transparent and often don't take the sound downhill as much as a D/A/D chain. To summarize, if you are looking for transparency, get the best standalone digital SRC possible. If you are looking for desirable color, get the best D/A/D chain possible. Less than the best of either of the above and you get into arguments over which loss sounds less worse :-)
__________________ Bob Katz DIGITAL DOMAIN http://www.digido.com "There are two kinds of fools. One says-this is old and therefore good. The other says-this is new and therefore better." No trees were killed in the sending of this message. However a large number of electrons were terribly inconvenienced. | |
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| | #10 | |
| Gear Guru Joined: Dec 2002 Location: Columbus, Ohio
Posts: 12,407
Verified Member | Quote:
Yet great analog EQ and comp/lims have a qualitatively positive effect on the signal that is not available digitally. To call that "color" is naive and disrespectful to that technology. Great analog makes any potential loss from the loop a moot point. Not to mention that 95 out of 100 people will never hear the loss with a great loop ... AND any single knob turn in processing will be more powerful than most HQ analog mastering loops.
__________________ Brian Lucey Magic Garden Mastering Dr. John, The Shins, The Black Keys, OAR, David Lynch, Sami Yusuf, moe., Sigur Ros Spiral Groove Studio One - mixing monitors | |
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| | #11 | ||
| Mastering Joined: Mar 2006
Posts: 3,099
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Quote:
You're also denigrating the many fine mastering engineers who get and have gotten not just good, but absolutely GREAT results from an all-digital chain. You're offending Glenn Meadows, Bob Ludwig, Ted Jensen, Bob Katz, Alan Silverman, all of whom have and often use(d) all-digital chains and are not afraid to talk about it. I get plenty of recordings and especially 1/2" analog mixes that have gone through "just enough analog gear", and which benefit from a more transparent approach to the mastering chain. I also get recordings which benefit from a hybrid chain. Same is true for the source. Once in a while, a client's 9624 mixdown is the better choice for the source than the 1/2" they also send. A really good digital processing chain operated by a knowledgeable operator can sound "warm, full and beautiful and spacious" (like those words?). The magic is in the skill of the user. With a properly-skilled mastering engineer, you would not be able to tell what kind of processing was used on any master. Around here it's NEVER a win-win situation. The digital tools are available to get sonic greatness---if you have the skill set to use them. For example, try the System 6000's MD4 in parallel compression mode, adding a dB or two of low frequency bias on the gains. Magic? No... but "analog" warmth--yes indeed. BK | ||
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| | #12 | ||||||
| Gear Guru Joined: Dec 2002 Location: Columbus, Ohio
Posts: 12,407
Verified Member | Quote:
As you're well known as a digital guy ("Digital Domain", right?) I was just pointing out that analog loops are not by definition a loss, they're often a gain.... and analog processing is not just "color", as in distortion ... it can also be a 'quality' change that masks the source in a good way. Assuming the same operator and eq/limiting direction, digital is at best a qualitative neutrality. Analog can mask the recording process for good or bad, and often bump it up with a better chain than was used initially. That's the kind of work I get. Never yet heard something that was good enough or smashed enough to stay digital. Quote:
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Further, do you think a pair of Trakkers or an STC-8 qualifies as an analog mastering chain that imparts a major upgrade in sound quality over D-D? Have you tried everything analog? I haven't tried nearly as many digital things as you have but I doubt you've heard as many analog chains in combo as I have. Quote:
My simple point was that an analog loop is not a distortion or "color" device, and a digital pass is not perfection. Each has it's thing. You used a pro-digital bias in the language above that I refuted, and then I agreed with you that the DA and AD are very important to making analog loops work. Quote:
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| | #13 | |||
| Mastering Joined: Mar 2006
Posts: 3,099
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To get a picture of how I think and not leap to conclusions like you have in the past couple of posts, you'd have to read my book cover to cover. That's the fullest context you can get. You'll find customized and rebuilt analog tube electronics here as well as souped-up digital gear. My objection was to your saying that a good analog processing chain ALWAYS (my interpretation of your words) makes up for the losses of the converters. Because it does not. Mastering is the art of compromise, and it boggles the mind to conceive that the compromise always falls ont he side of the analog processing chain. The losses of the D/A/D portion of the chain have to be made up by the analog processing tools inserted in that chain, but it is rarely a win-win situation---that's where we disagree. Demonstration of compromise: Oh, the transients are a bit less defined in that patch, but oh, so sweet the sound. I'll go with the analog, because overall it sounds better. I've taken apart and rebuilt and designed so much analog AND digital gear that I know where most of the bodies are buried. Just remember that my writing speaks for itself and context is everything, which is why you must not take my short post out of context with abrasive remarks, especially "digital bias". Quote:
Quote:
Context, context, context. | |||
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| | #14 |
| Gear Guru Joined: Dec 2002 Location: Columbus, Ohio
Posts: 12,407
Verified Member |
Um, please explain how my posts were "abrasive" and "leaping to conclusions" and "insulting" ... seems to me you're leaping. I'm commenting on your posts and the topic at hand. If anything your tone here is authoritative on subjective topics and condescending to other MEs. That was my beef in that other topic today: stop insulting MEs who do what clients ask for, limiting. My beef in this post is: stop assuming that analog is inferior. If you dont mean that your words do lean that way. And thanks for the plug on your book, I was unaware you wrote one ![]() p.s. My tone is NOW becoming abrasive |
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| | #15 |
| Lives for gear Joined: Aug 2005 Location: Indianapolis, IN
Posts: 2,825
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:::: gets popcorn ::::
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| | #16 | |
| Gear Guru Joined: Dec 2002 Location: Columbus, Ohio
Posts: 12,407
Verified Member | Quote:
not today bro ... back hurts, and music to be made | |
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| | #17 | |
| Mastering Joined: Mar 2006
Posts: 3,099
| Quote:
And you tend to read apparent meanings into my posts out of context. My post was aimed directly at mastering engineers who default to "loud" strictly for pecuniary reasons, even before the client asks for it, and not esthetic ones. If the shoe fits, then the insult applies. | |
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| | #18 | |
| Lives for gear Joined: Apr 2004
Posts: 5,695
| Quote:
First please please please understand how much 99.99% of the Gearslutz audience loves having you here. It is a downright honor and pleasure reading your posts (I go out of my way to track your new posts down just like I do with a few other GS members). I know it can get frustrating around these parts from time to time but I think I speak for most when I say thank you for taking time to post here!! Please remember to take some posts with a grain of salt. Written word can be very confusing and intentions can be easily misconstrued as I am sure you know. I just don't want you to be chased away from here as a few other high class and highly talented people have been by a few difficult posts. Peace love and Woodstock!
__________________ Michael | |
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| | #19 | |
| Mastering Joined: Mar 2006
Posts: 3,099
| Quote:
Hi, Michael. Thanks for your wonderful thoughts and summary. It's a very nice community here, and once in a while, just through the use of simple words, someone is going to rub someone else the wrong way. For example, my use of the word "color" as a general overall "shortcut term" to describe the wonderful world of analog rubbed Brian the wrong way. But I got very angry at his use of "naive" and "disrespectful" and it affected the entire tone and emotion that I used to respond to his points. If you look back at the thread. It started with some excellent replies by Jay Frigoletto that answered the original question and stood very well on its own. I didn't feel I had any reason to add anything until Lucey, with an obvious entirely-analog bias (do you feel it?) made claims that say: ----you can only get "the sound" through an analog chain (which is not true---"ONLY" is the problem here) ---digital processing is only at best good for transparent or neutral results (which is patently untrue) ---the compromise of a D/A/D patch is ALWAYS made up by the advantages of the analog processors in the patch (which is also untrue). In fact, mastering is the art of balancing objective degradation against subjective improvement. And it would be "naive" and "disrespectful to the technology" to say that a D/A/D chain is always going to make the sound better. In the process of trying to stuff his point down my throat, he ignored one of the most powerful short posts I've ever made, which tells you how to warm up a recording using a multiband parallel compressor. It doesn't have to be digital, but there isn't currently any multiband parallel compressor on the market. The Drawmer analog crossover box (very clever) would allow you to build one yourself, though. I use the MD4 for this purpose quite often, and it often completely replaces several stages in my analog chain, quite well, thank you! It's simultaneously transparent, invisible, and can be "colored", all at the same time. I'm technology-neutral. I've spent my entire life studying and even philosophying how and why each piece of analog and digital gear and technology produces the sounds that it does---and I think I've come closer than many people, to describing in print how the gear works, how to use the gear and get the sounds you are looking for. In the past few months, on little sleep, mostly on furtive weekends and with the help of my assistant so I could earn a living in the mastering room, I've--- ---custom-built a D/A converter in a box using a board from Dave Hill, built a custom multi-frequency Sample rate converter using the Crystal Semiconductor 8421 eval board and some glue logic, replaced the coupling capacitors in an aging piece of tube gear, written a monthly article for Resolution Magazine, and still managed to do posting here. Talk about burnout. I'm sorry if I offended Brian Lucey or hurt the tone of this excellent place---but it was in response to feeling rather offended by his manner and some patently arguable points of logic and untrue statements on his part. BK | |
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| | #20 | |
| Gear Head Joined: Feb 2006 Location: London
Posts: 40
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You will just have to cheer yourself up by opening a King James Version and turning to Matthew 7:6 ... | |
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| | #21 | |
| Lives for gear Joined: Apr 2004
Posts: 5,695
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Hi Bob. Great post and great points. Quote:
Anyway I just don't want you to feel that you are not appreciated here, you are. Thanks again for posting and contributing. | |
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| | #22 | |
| Lives for gear Joined: Oct 2005 Location: NYC USA
Posts: 1,294
Verified Member | Quote:
Hits nail on head. | |
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| | #23 | ||
| Gear Guru Joined: Dec 2002 Location: Columbus, Ohio
Posts: 12,407
Verified Member | Quote:
Bob I was never offended, I was just disagreeing with you. I'm also sorry if you're offended by my tone. I'm direct, but I dont mean to offend. I would think some debate with your strong views would add to this excellent place? No? If your opinions are water tight there is nothing but gain for you to have a debate patsy, right? Quote:
Some people carry the view that once digitized, even by a shitty converter, audio is somehow 'perfected' and D-D processing after that point is inherently better and any DA AD is a loss. If great analog is used this is untrue. Untrue UNLESS the initial audio is AMAZINGLY AMAZING in the first place or SMASHED BADLY to where any analog processing will only make it worse. That was my point. | ||
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| | #24 | |
| Lives for gear Joined: Aug 2003 Location: Hollywood CA
Posts: 2,625
Verified Member | Quote:
DC | |
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| | #25 |
| Registered User Joined: Apr 2006
Posts: 102
Thread Starter |
Hey guys, Just imagine how I feel. I'm just learning about mastering and producing and here all this action. The question was spawned from the Katz book and here he comes answering some questions. Whoa.... anyway this is a great forum hope to learn more. thanks |
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| | #26 | |
| Mastering Joined: Mar 2006
Posts: 3,099
| Quote:
Yes it is. And I give him a big headline with it in my book. It's one of the best one-liners I've seen in a long time. I didn't quote him in my particular post, but usually I do if I use the line. I almost never quote someone without giving him/her credit, unless it would completely spoil the flow of the conversation. How about a good, juicy quote from DC that's that good it should go in a book? BK | |
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| | #27 | |
| Lives for gear Joined: Oct 2005 Location: NYC USA
Posts: 1,294
Verified Member | Quote:
[Bob O.] hits nail on head! Sorry for the brief pissing contest interruption. Continue please. P.S. For what it's worth BK, I agree with your view on this. Whatever. | |
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| | #28 | |
| Gear Guru Joined: Dec 2002 Location: Columbus, Ohio
Posts: 12,407
Verified Member | Quote:
I also agree with Bob O ... that's a great thought. | |
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| | #29 |
| Lives for gear Joined: Mar 2005 Location: Brooklyn
Posts: 2,029
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I like to watch titans fighting... I've loved it since the first time i saw the Black and White version of King Kong ( fighting the Dinausor )when i was a kid ... |
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| | #30 |
| Gear nut Joined: Feb 2003 Location: Australia
Posts: 109
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I thought that all of what Bob Katz said was lucid, instructive and very helpful. And I thank him for taking his time to post. Haigbabe PS I love my Weiss SFC2! PPS I love my Gambits and wish I could get the DNA as I've tried the K-stereo system on it and love it! Bravo Bob. |
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