Archive for the ‘My Tools’ Category

Using Transformers to Transform Audio

Wednesday, April 14th, 2010

This article originally appeared in Tape Op Magazine.
Technical editing by Scott Hampton

IMG_1245A transformer is a device that transfers electrical energy from one circuit to another via inductively coupled conductors – coils of insulated wire wound (most often) around a ferromagnetic core. Transformers are useful in audio recording, as they can block DC voltage and facilitate electrical isolation between gear, but they also shape the sound of signals sent through them by introducing subtle, and often very desirable “coloration”. This may be a result of any combination of frequency response, time response, distortion, or a number other factors for a particular transformer. These effects can be especially attractive when working in the digital realm, where sounds can be perceived as too “cold” or “digital”.

With all the talk of the sound of transformers, which reside in different pieces of audio gear, why not skip all the electronics and strap bare transformers into the audio path directly? The first time I heard this done was at a mastering session with Nick Blagona in Toronto, when he ran a pretty crispy sounding record through a pair of vintage Marinar transformers that he had lifted from a Neve module. The sound was just right for this record – fat lows, punchy mids and a silky top. I personally hadn’t had a chance to do much with this idea until I recently pillaged my repair guy’s stock bins, and now I’m hooked on trying all kinds of transformers in all kinds of situations.

What you’ll need are 600 ohm to 600 ohm “matching” transformers. These will generally work properly with the gear in our racks. Be careful of center tapped transformers (center tap to ground), If these are exposed to +48 volts (from phantom power) in your system they could easily be damaged. Simply wire your transformers up to cables that work with your gear or patchbay and you can insert them anywhere in your line-level signal path.

I’ve now tried transformers on all kinds of sources, and have fallen in love with many of the sounds I’m getting. My favorites so far have been a pair of vintage Triad HS-66s, as they add a mid-range thickness to the signal that really warms things up without obscuring the lows or the highs. On a full mix, they add a heft and three-dimensional quality to the sound that, while certainly not achieving the full effect, leans in the direction of a vintage console. On individual instruments they have a fattening affect that’s especially cool on kick drum and bass guitar. Pushing the signal can drive the transformer into distortion – sometimes a desirable lo-fi sound – though the need for an attenuator crops up pretty quickly. In one case I was tracking male/female duet vocals for the Brooklyn band The Loom, and found that the female singer had a strong midrange warmth that made the male voice sound a little thin in that area. By patching in one of the Triads after the compressor in his vocal chain, his sound warmed up just enough to match hers beautifully. Without disrupting the flow of the session, the transformer gave me just that little bit of harmonic complexity that I needed. It was like stirring a little more flour into the gravy, thickening to taste.

Another interesting pair of transformers were pulled from some odd quad encoder that the Japanese company Sansui was trying to develop in the ‘70s. As they were attempting to impress the pro audio market, they used some serious matching transformers. These add a harmonic richness to the midrange that can only be described as warm and fuzzy, and they also round off the highs well enough to function almost as a de-esser on certain vocals tracks. I wasn’t able to use them with any success on a mix, but on individual tracks they are able to add a strangely satisfying vibe I just couldn’t get with any other gear.

A UTC transformer that NYC engineer Matthew Agoglia liberated from a vintage compressor made a female vocal go from rich dark chocolate to three-dimensional licorice, adding a harmonic complexity that gave each syllable its own distinct vibe – way more interesting than it had been before. The same UTC on electric bass added a weight that seemed to get the signal out of the speakers and into the room, and that’s a big deal for me when working on my Pro Tools system.

IMG_1201With pairs of matching transformers slowly making their way to my studio, I’m beginning to see the possibility of putting them all in a (shielded) box, wiring them to DB-25 connectors and having them ready to be inserted between my converters and my Dangerous Audio summing box. Buying them in pairs allows me to send stereo stems out through matched left/right pairs, or to run full mixes through them. The cool thing about having multiple pairs is that you can have any number of different flavors on hand, rather than just multiples of the same sound as you would with a console. Then again, there is something to be said for the unifying effect of many of the same transformers. Experiment and see what works for you.

There are all kinds of transformers available, from vintage units by UTC, Triad, Marinar, CineMag and St Ives to brand new transformers from Carnhill, Jensen, CineMag, Lundhal, Sowter and others. While most of these companies are set up to supply gear manufacturers, I’ve found they’re all very approachable and willing to help a guy like me buy a pair. Most quality 600 ohm to 600 ohm transformers hover just above the $100 mark, so it’s a relatively inexpensive way to have some extra audio processing at hand. I highly recommend that anyone who is curious about this to try it out, and if you find some cool, obscure transformers with a vibe, do drop a line and let us know!

A Simple Transformer Explanation
A signal goes into one side of the transformer (usually the side driven is referred to as the primary), and the voltage that results on the output (secondary) is the input multiplied by the turns ratio (neglecting internal losses). The impedance ratio is the square of the turns ratio. Example: a 1:10 step-up transformer on a mic pre input would have a 1:100 impedance ratio. Meaning the voltage gain is x10, at a cost of increasing the output impedance by x100. A DI box is an example of going the other way, stepping the voltage down, to reduce the driving impedance. The lower the impedance a signal is being driven with, the less susceptible it is to noise. -SH

The Farm Gets a New Studer, or Why I Bought a 30-Year-Old Tape Machine

Monday, January 25th, 2010
Spinning MRL 30ips

Spinning MRL 30ips

It’s a 1/2″ 2-track Studer A80 MKII, built in 1981 that apparently beat around various studios in NYC, wound up in New Jersey for most of the early 2000s and landed here in Brooklyn a couple days ago, in January 2010.

So why did I buy an analog tape machine when I have an exceptional digital system (using Pro Tools HD, an Antelope clock and Cranesong HEDD conversion)?  The short answer is that I like it better.  I could go on and on about frequency response, jitter, distortion, color, harmonics and all of that, but the truth is that there is just something very satisfying about the physicality of working to tape, both sonically and tactilely.

Sonically – When I mix to tape, two things happen that make it totally worth while: the vocal sits down and the bass tightens up.  There’s something in the way that vocals get married to the mix when I go to tape that, no matter how hard I try in digital, doesn’t quite happen the same way.  Call it compression, call it unifying the color pallet, call it “tape magic” – call it what you want – but for me it’s just so much easier to get vocals that are both present and married to the mix when I go to tape. Then there’s the low-end. Low-end is, for me, often the most challenging aspect of making a record.  It’s an unruly area of the mix where enormous waveforms battle for dominance.  They fight fiercely with each other and, just when you’ve got them getting along ok, they’ll gang up and try to take over the entire playback system.  Digital low-end often sounds unfocused to me, while analog low-end sounds tight.  Every time I mix to digital and to tape and compare, the low-end on the tape mix is so much closer to what I was trying to accomplish in the first place.  Of course, nothing is a hard and fast rule, and there are times when the digital mix wins out for whatever reason.  But, the percentages are with tape.

photo-5Tactilely – It’s a part of my personality to want to touch tape, watch it spinning along, cut it, tape it together, lift it, set it down.  And I enjoy doing machine alignments.  I used to work as a bicycle mechanic, and I miss working with my hands, holding tools and making things spin accurately and freely.  I’ll be the first to tell you that working on tape is a pain in the ass, but everything that makes it a pain in the ass makes me enormously happy.  I can’t claim that my tactile work itself has any impact on my mixes, but working this way has a big impact on my enjoying my work, which can easily impact my mixes.  In short, I like it, and that’s good for the music.

Hybrid System - My mixing studio is based around Pro Tools HD feeding an analog summing mixer (Dangerous Audio D-Box) and incorporates analog compressors (API2500, DBX162) eqs (Vintech X73i) the wonderful Cranesong HEDD 192 A/D/A converter as well as a slew of vintage and new transformers (Triad, UTC, Carnhill), and now the Studer.  Combining these analog and digital tools allows me to take full advantage of the lightening-fast recall of digital while getting as much of that analog vibe and feel into my work as I possibly can.  And I can still fit it all in a room small enough to keep my rates reasonable within today’s recording budgets.  For me, this hybrid system is working exactly as I want it to.

Don’t Romanticize Tape – Remember, tape is a pain in the ass compared to digital.  It’s expensive; it’s physically enormous; it can’t be sent over the Internet; the machines break and need constant care; fewer and fewer people are using tape, making it increasingly incompatible across studios; it’s increasingly harder to find good formula; and it can be hissy.  For these reasons, it’s important not to romanticize tape.

Romanticize Tape – And yet…tape is pretty damn cool.  It’s the same medium all those amazing classic records were made on.  The machines are esoteric feats of electronic and mechanical design (mine is like an enormous Rolex watch).  The sound has the texture and vibe of the previous century – a nostalgic aural halo.  And working on tape allows you to turn off the computer and just listen, while rewinding, fast-forwarding and changing reels builds natural breaks into the work flow.  I would argue these breaks are necessary to better listening, giving us a little aural rests that allow our neural pathways to remain fresh to the incoming sounds.  Yes, it’s pretty easy to romanticize tape, and I do it a lot, though I try to temper that tendency with reality checks like the recording budget.

photo-3Converters and Clocks Come First – Nothing makes less sense to me than running out of a blah digital system to tape and back in through the same blah system.  At that point, was it really worth what tape gives you sonically to have passed your music through a blah system twice?  For me, I spent my money on great converters and clocks before I bought my tape machine because I just don’t see the point of going to tape if the sound is going to be marred by the digital system it’s hooked up to.  That’s like using hand-blended oil paints on a paper towel.  Might be cool for one or two projects, but overall a waste of expensive materials that take a great deal of effort make and to use.

It’s Up and Running – So, whether you’re a mixer who wants to hit tape and use the best conversion out there, or you’re an artist or producer who wants to hear your recordings got to analog before mastering, or you don’t give a damn at all about technology and just want the music to sound great, The Farm is now fully equipped to do any of these things.

photo-1

Focal Ad…

Wednesday, May 13th, 2009

focaladIt was a while ago that Focal Professional ran an ad in Tape-Op with a quote from my reivew of their Solo6Be speakers.  I have to say, since writing that review, I have listened to those speakers more days than not and am still impressed every time.  No monitor is for everyone, but some really do offer a level of clairty that I believe to be “more accurate” than others.  Their slogan “Listen to your music, not your speakers” makes sense to me.  And no I do not have and endorsement deal with Focal – I just really dig these things, and am a big nerd about gear.

An open letter to Digidesign…

Friday, April 17th, 2009

d_logoDear Digidesign,

I first want to go on record as someone who does not complain about Pro Tools.  I know you get a lot of grief, but I have been making my living with Pro Tools for so long that I can only say thank you for making it all possible.  I love that you are the studio standard because I can count on Pro Tools being there, wherever there is.  I also think Pro Tools is the most elegant DAW; there is a “tape machine” and a mixer, just like analog.  Easy, simply, effective and quick.

In an effort to help the evolution of Pro Tools, I am writing this to put forth my own personal wishlist, and to invite others to jump in.  I know there are a lot of forums out there where people post their wishes, but here in my own little corner I hope to keep a kind of running wishlist that my cohorts and I can ammend as we wish.  With no further ado, these are things that I would love to have appear in new versions of Pro Tools:

• Inserts on sends: Just one or two inserts on sends would be wonderfully helpful.  From something as simple as eq’ing a snare going to a reverb to something more complex, like distorting a send that’s feeding one of two parallel compression subgroups, this would be a cool feature.  I’m sure I’d use it when creating multiple cue mixes in Pro Tools, too.

• Track patch saves: The idea is to be able to name and save a set of inserts and all of the plugin settings and then be able to easily call those up from a menu and apply them to any track. For example, “Big Al’s Phat Bass” might apply an eq, a compressor, an instance of Phoenix, each with its saved presets for that track patch.  We could eventually build libraries of our favorite patches.  Maybe we could apply a track patch from our library while creating a track.  We all know the work-arounds, and they’re time consuming, demand a good memory and require that a session in which we saved a cool patch on a track is on a connected drive. Track patches would save enormous time during tracking and mixing.

• Name a track and choose color when creating it: pretty simple request, but it makes sense.  When creating more than one track, I can see the trickiness, but perhaps there’s a way.  (And don’t forget that we can chose track patches at this point, too, right?)

• Free and easy cross platform compatibility: maybe it’s just my nature, but being able to open sessions in other DAWs without paying extra just seems like a nice thing to do.

• Album mastering mode: This one is big! OK, so what if Pro Tools could enter Mastering Mode, where all the familiar Pro Tools editing functions were applicable, with the addition of adding CD track markers, PQ and ISRC data, a playlist editing window, full CD burning and DDP export functionality, master dither for whole album, a mastering shuffle mode that moved all regions and markers to the right, but left everything to the left alone.  I could go on, but I’m sure you get the idea.  I want a fully functional mastering and CD authoring program within the familiar editing territory of Pro Tools, making use of that lovely 64 bit mix engine, external clock, etc…

• Session comments: I picture this being a simple form that one fills out.  Automatic data about the dates of recording could be generated as a list, and the bit depth and sample rate and Pro Tools versions used could be logged, too.  There would be fields for the studios used, engineers, musicians, and all the necessary data.  The consistent data could easily be imported from one session to the next for an album project.  Exportable as text documents or .pdf for emailing around the world and for printing, but equally as importantly, right there to view when opening a session.

• Recording has stopped visual alarm: This would simply be an enormous flashing black and white screen when recording had, for some reason, stopped unexpectedly.  Sometimes when a disc is full, for example, PT stops, but one doesn’t know it until way too late.

• Hardware insert bypass: why doesn’t this ever work for me?  When ever I try to bypass a hardware insert, I can’t do it.  Would really like to be able to A/B my inserts.

•  “Audio.01: make it so that no audio file can be recorded with the word “audio” in its track title.  In fact, I’d go so far as to ask for an industry standard file naming protocol.  My suggestion is: SongTitle_Instrument_Take#.  I’d also like to see a dialogue box that says “Audio is an illegal file name, would you like to see a list of industry standard track names?”  Further, the song name could be automatically inserted onto each audio file, a choice in the preferences, perhaps.

• Legible track names: somehow I’d like to be able to read my track names, and unless it’s short, like “K” or Gtr,” I often have a hard time making out the truncated words, especially in narrow view mode.  There has to be a way.  Diagonal – like parking spots maybe?

• Longer delay compensation: If only to allow my 6200 sample dealyed linear phase eq to work during mixes.

• Import session data attribute saves: When importing tracks from different sessions, it would be a great time saver to be able to pick from a bunch of preconfigured import settings that we could name and save.  For example, “Empty tracks with plugins only,” or “All audio regions and plugins without automation.”  I picture this looking a lot like the group attributes saves.

• Name group attribute saves: While we’re on the topic, I’d like to be able to name my group attribute settings, rather than just using the numbers.  I can’t remember what they were, usually.  I’d use names like “All functions grouped” or “Faders free edit group,” or just “Allen’s typical group settings.”

• Import track colors: when importing session data, tracks colors don’t travel into the new session.  I wish they would.

• Markers follow bulk edits: Alex Oana explains in his comment below that one can shift-click in the marker bar when selecting audio regions, and they’ll follow the edit.  Thank you, Alex!

I hope to add to this as my hours/day using Pro Tools don’t seem to be coming to an end just yet, and I certainly welcome comments from everyone.  Thanks, AF

Mastering at The Farm

Saturday, April 11th, 2009

I’ve been mastering records I’ve mixed for a number of years now.  The first record I mastered was Born On by the Portland, OR band Time Farmer.  bornonBy the time I was done mixing this one, I felt like we were so close to having the exact sound I wanted that I thought it would be worth mastering this one myself.  Everyone was happy, and to this day it’s one of my favorite sounding records I’ve worked on.  The next one I mastered was Golden Dragon by the Philly band Downtown Harvest.  Same thing here – we were very happy with the sound, so I went for it – again, another favorite.  And on I went, slowly taking up mastering on my own while carefully observing all the great mastering engineers I’ve worked with, like Jeff Lipton at Peerless Mastering in BostonNathan James at The Vault here in NYC and Nick Blagona at Metalworks in Toronto.

More recently, I have begun to take on clients for whom I am only mastering. It was only after a number of years mastering records I had mixed that I felt I was ready to take this step, as the experience has allowed me to study mastering more, gather some critical tools, and to develop a method that gets me the results that I and my clients are looking for.  At this point I’m not only happy to be offering mastering, I’m totally enjoying it! I think one of the most rewarding things about mastering is that I know we are making the final decisions about the record – this is what is going out into the world.

cutting-lathe-copy

A cutting lathe. This is why the call it "cutting a record."

In the past, mixers and mastering engineers were completely different animals.  The job of the mastering engineer was to take a tape and  transform it into a master disc from which the vinyl releases would be manufactured.  This required the use of a lathe, a specialized machine that cut the master.  It’s no wonder that mastering was its own field.  Today, however, we are more often than not going from digital files to digital files.  For better or worse, anyone with basic audio software and a disc burner can make a master.  Of course, this doesn’t mean that anyone with the capability of making a master has the capability of making a good sounding master, but it does mean that more experienced engineers can begin to take on the role of mastering using much of the gear that they already own.

So, my methods for mastering will vary according to what the project seems to require, but in general I am mastering out of Pro Tools HD, sending out to hardware with the hedd_192productCranesong HEDD 192 converter, often hitting my API 2500 compressorph1_2500_m when appropriate, and using a few key plugins within Pro Tools, including the Sonnox Inflator, the PSP Neon Linear Phase EQ and the Massey 2007 Mastering Limiter.  I’m learning that the API 2500 can be a very neutral box, with such a low ratio as 1.5:1 and ultra fast release times, just getting those needles to bob every so slightly allows the box to add a coherance and punch to mixes without imparting too much of that sound.  The HEDD’s tape and tube emulation has proven indespensible, especially when needing to add warmth and depth to crispy digital mixes.

One thing that I seem to do a bit differently is that I am really relying upon the addition of harmonics to achieve apparent loudness and excitement.  As when I mix, I try to take a layered and cascading approach to adding harmonic richness.  Getting a little bit of harmonic complexity out of each stage in the chain can result in a very lively master that doesn’t sound squashed.  And I’m entirely committed to learning how to get the masters to really come alive without being overly concerned with the so-called “loudness wars.”  I aim to get the masteres “up there” but to retain enough dynamic range that they are stll engaging and don’t tire out the ears.  For me, adding harmonic complexity seems to be the key to achieving these results.

Finally, one of the most imporant additions to my studio for mastering is the new Antelope Isochrone OCXV master clock. ocxv It’s hard to explain how key this piece of kit is to feeling as if I can truly make the best calls regarding producing a final product.  Both the ability to hear into the music in order to make the best choices about processing and the overall increased accuracy in the digital stream that becomes the masters themselves are essential to my work at this point.  It’s my humble opinion that the Antelope clocks are going to start finding their way into a majority of mastering studios.

So, there we have it: I’m officially out of the closet as a mastering engineer!

Analog vs. digital summing with Pro Tools and D-Box

Thursday, March 5th, 2009

I have never accepted digital mixing fully, and have always sent my Pro Tools mixes out to analog line amps and bus compressors to get that undeniable depth, width, punch and realism. Bob Katz, a known authority on such matters, has said that this technique is all that’s needed, and that the need for analog summing is a “red herring.” In other words, all you need to get “that analog sound” is two channels of analog flavor by routing out to some analog gear in stereo. He and many others have insisted that what we mixers like about analog summing is really just the harmonic distortion we pick up by routing out to analog gear. Indeed, I do like that.

However, there are those on the other side of the fence who insist that analog summing is giving them more than just the harmonic distorition. They tend to claim that the stereo field opens up, that the reverb and delays they use are more evident and elegant, that there is a greater depth to the soundstage, and so on. I knew I liked the sound of a console, but I hadn’t really done much to compare digital and analog summing, other than to work in different scenarios and think: “that was different” and “I like the sound of a console.”

Last year I bought a Dangerous Music D-Box, which has an 8 channel summing mixer. I hadn’t used that summing mixer until this week, when I thought it was time to give it a shot. I really wanted to make an apples-to-apples comparison, so here’s how I configured my trial mix: Pro Tools HD -> Lynx Aurora 8-channel D/A converter -> D-Box summing mixer, then the stereo outputs of the D-Box -> Vintech x73i line amp -> API 2500 bus compressor -> Cranesong HEDD 192 A/D converter -> Pro Tools for the print. (Everything is clocked to an Antelope OCX-V).

For the analog summed mix, I stemmed the drums to channels 1-2, the guitars to 3-4, the effects and bells to 5-6, the bass to 7 and the vocals to 8. For the digitally summed mix, I simply bussed everything out to 1-2 and printed a mix. In this way the only difference between the two scenarios is that I summed in analog in one and in digital in the other. I’m still getting the coloration of the D-Box summing amp’s circuitry in both cases.

The digital mix:

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The analog version:

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Is there a difference? Yes, and my vocabulary is about to sound the same as everyone elses: the analog summed mix is wider, deeper, more musical, more spacious, etc… Especially noticable to my ears is the detail in the effects, the delays and reverbs. They seemed more audible in general, but also more spacious.

In general, the best way I can describe the difference between these two mixes is that the ITB mix sounded like I feel before I do yoga, and the analog summed mix sounded like I feel after yoga – as if some tightness had relaxed and opened up the various elements of my body so that each molecule had that much more space. I know, it’s a pretty lame, new-age analogy, but there it is. Which did I prefer: the analog summed mix, for sure.

I also looked at the waveforms, and they were different, as you can see by comparing Fig 1 and Fig 2. I have no idea how to make any sense of what’s going on in these waveforms, but my sense is that the analog summed waveform is more complex, which fits my understanding of analog gear: it’s vastly more complex and nuanced than digital – just ask any plug-in designer.

If nothing else, this experiment helped me understand that the D-Box’s summing section is worth using, and given the price of that unit its value just shot up considerably as an indespensible centerpiece to my mixing studio. I’m happy to have confirmed my suspicion that analog summing is superior to digital summing. But is it vastly different? – well, not vastly different (it is only 8 channels), but for me it’s all about making small differences at every stage of the mix, such that the cumulative effect is a better, more musical, mix. I don’t ever expect one piece of an elaborate chain to hold the key to the sound. I do yoga every morning becuase it makes my day better, not becuase it makes my day.

Antelope clock gets installed at the Farm

Sunday, March 1st, 2009

ocxvI just installed an Antelope Isochorm Digital Clock in my mix room, and it’s an amazing contribution to my system. Anyone could hear the difference. Everything sounds so much more open, punchy, and easy on the ears. In fact, it sounds more analog. I hadn’t thought of this angle when I was writing the review of these clocks for Tape Op (with Jessica Thompson), but it’s true. Someone told me Joel Hamilton said it was like working on tape again, and it just made sense, but I’d say it also is like working on a console becuase it’s so wide and open sounding. But it is like tape in that the harshness is gone – just gone. The top end is smooth and airy, and the bottom is fat and punchy. It’s a vast improvement, and I am thrilled to have this thing ticking away in my rack.

What a clock does is regulate the 0s and 1s streaming at ultra fast rates through the system (a CD streams 44,100 of them per second). When the spacing between these numbers isn’t right, you get distortion – called “jitter” in clock lingo. With a more stable clock, the reduction in jitter allows the sound to open up and carry far fewer of the anomalies we have heard in digital over the years. In my case, the Antelope Clock is feeding both my Lynx Aurora converter, my Cranesong HEDD converter, and my Dangerous Audio D-Box D-A converter that I use for monitoring. When I consider what an impact the Antelope is having on so many aspects of my gear – including how Pro Tools and all the plugins are operating – it’s a no brainer that this is a killer piece of kit for any digital system.