Overheads and room mics mixing and recording thoughts

As I’m mixing things that I (and others) recorded I notice that sometimes the room mics and overheads are unbalanced.

For instance, with overheads, the snare can be a little off-center, and sometimes even the kick is leaning to one side more than the other. I usually place overheads as a spaced pair and not in XY so the overheads really are just there to capture the cymbals. However, because the OH are a spaced pair and are positioned above the cymbals, the kick and snare end up off-center. It’s probably possible to place a spaced pair so that they capture the cymbals but the rest of the kit is still balanced, but these things can be fixed in mixing too. A high pass at around 250Hz would basically eliminate the kick, and a really fast compressor will work to eliminate the snare from the overheads without washing out the cymbals.

I noticed that some of my room mics have a similar issue – the kick and snare aren’t centered. The way I almost always position the room mics is on the floor and so that they create an equilateral triangle with the kick. This should guarantee that the kick is centered, but I guess sometimes the microphones aren’t symmetric with regards to the kick. However, this positioning will always lead to the snare leaning to one side or the other. Since the room mics serve as a full image of the drum kit, this isn’t something that can be fixed during mixing. So maybe a better method is to keep the microphones symmetric along the line that runs between the kick and snare. One way of doing that would be to position the microphones in front and behind the kick. Another is to have the microphones in a non-equilateral triangle formation.

With all this being said, I haven’t really noticed the drums being asymmetric once the close mics are brought up, so maybe this isn’t something that a lot of time is spent on during quick sessions.


Guitar recording

This might not be helpful to anyone who reads this but me.

Recorded guitar today. Guild S-300D into an Orange Tiny Terror into a 1×12″ ported cab (similar to TL806).

I used a Coles 4038 going straight into my little sound interface’s preamp (Avid one track thing).

I aimed it pretty much at the center of the speaker, and at a foot away it picked up too much of my picking and sounded a little thin (I wasn’t playing loud). At about 8″ away it was a little too boomy. Will try 10″ away next time.

UPDATE January 8th, 2015:

Same setup again (all of it). I kept the microphone 10″ away from the amp and I got the same sound. At 10″ away there’s already a lot of bass because of the proximity effect. It’s not a bad sound, might even be a good sound, but it doesn’t sound exactly like what I’m hearing in the room. I should mention, though, that I play quiet enough that I can hear the acoustic sound of the guitar along with the amp. That could contribute to why it doesn’t sound the same. Anyway, I moved the microphone maybe an inch or two away from the center (off-axis) and things cleared out a little more. Not as boomy anymore. That’s something to keep in mind.

Recording and Mixing Hungry Man’s Eater

Hungry Man is a band I’m in and Eater is our first record. I recorded it almost a year ago (with Jon San Paolo’s assistance/tape op-ing) and mixed it a couple of weeks later. I’m not happy with how it sounds and want to put down in writing what I don’t like about it and what I should have done better. If you read this and are interested in listening to the record, you can hear it here.

I think it was recorded well, and frankly, a monkey can setup in Electrical Audio’s studio A and get usable results. The problem was mixing it. Here’s what I think I did wrong and what I’d do differently next time.

– We mixed loud. I didn’t have an SPL meter with me, but I think it was at the very least 85dB SPL loud. This was dumb for a couple of reasons. One is that our ears got fatigued fast and we took no breaks (mixing was done in a day) which made them even more tired. The second is that it was my second time working in that studio (not EA), so I didn’t really know how things sound there, and I think the room was interfering with what I was hearing. Also, when we mastered Bob Weston gave me this great advice – he said to mix at the volume the music will be listened to. With all that being said, the Fletcher-Munson curve says that our hearing flattens as things get louder, so maybe loud is better?

– The bass is too loud. I think that this goes back to monitoring too loud (although it contradicts what I said about the Fletcher-Munson curve), but also to the fact that I play bass and probably had the inclination to push it up. In the room it really didn’t sound that loud. If I were to mix it now, I’d drop the bass down by at least 2dB.

– The snare sounds wonky. This is probably my biggest mistake. The snare sounded beautiful when we recorded, it’s a 5.5 Supraphonc chrome over brass that has an explosive sound. However, sometimes it disappeared in the mix, so I set on fixing that by pushing some mid frequencies. I think I overdid it which made it actually lose some definition and sound wonky. A better idea would have been to compress it a tiny bit. That would have helped it stick out. FWIW, I got the mid frequencies advice from a fellow engineer who does amazing work, but I executed it wrong.

– The kick is.. weird. It’s very full and has this insane attack, but it’s too, I don’t know, pop-punk? What was going on was that I gated the beater side microphone to get rid of the snare there, and I mixed it too loud with the front side microphone. I think the fact that I consistently mixed it wrong with the front side mic is maybe a testament to how I wasn’t hearing things as they actually were.

– The drums disappear sometimes. I could have maybe gotten away with compressing the drums. Just a tiny bit so they don’t drown.

– The record is dark. Hear how dark it is? It was actually darker when we mixed it. I should have eq-ed the overheads and added ~1.5dB at around 10k. Maybe same thing with the room mics. Definitely should have added high end to the guitars and cut some of their low end. I think that part of the bass being loud is that we were competing over the same frequencies a little bit.

– There are room mics on the vocals, and I gated them so they open up when the singer yells. Thing is, the singer always kind of yells. It’s not like Heart Shaped Box by Nirvana where Kurt Cobain all of a sudden yells while the band maintains the same dynamics. Gating the room mics is a cool effect, but doesn’t work on every record or every song, and I should have known better.

– There was a room mic on the guitars that we ended up not using. I honestly don’t think there was room for guitar room here, but a big part of why we didn’t use the room mic is because it was unusable. It just sounded flimsy. Like someone accidentally left a microphone open, and it sounds bad and off-axis. What happened is that the guitars were in Center Field and they weren’t very loud. I mean, they were loud, but they weren’t absolutely filling the space with sound. The room mic was placed very far from the amps, maybe 25ft or more. It was dumb. Placing it closer I could have gotten something useful.

– We mixed 8 songs AND re-did vocals for a couple of songs in one day. And of course it’s not like we got in and started working. I had to calibrate the tape machines, set up microphones for singing (it’s quick, but still), then break them down, and only then start mixing. Also, I got in a car accident (wasn’t my fault) on the way to the studio, and while I was physically fine, it did cost me 30-45 minutes of dealing with it. I was also thrown off by the whole thing a bit.

To sum what I should have done differently in the mix: lower the bass, boost the high end on the drums, boost the high end on the guitars, don’t mix in so much of the beater side mic, don’t gate the room mics.

Also, next time I mix a record I think I’ll tell the band to get there half a day after me. This way I can listen to everything and take notes on what might need work, and be more prepared. Also, mixing 8 songs in one day is a bad idea. Two days of mixing would have made this so much easier, physically and mentally, and would have given me more time to get things to sound right.

Racking Neotek Series III input modules (making the box)

Back when I started this thing two years ago, I wrote about how I have plans to rack a pair of Neotek SIII strips that I’ve had for a while. That didn’t happen that summer, nor the last one, but it’s happen this one.

Back then I had almost everything I needed except for the enclosure. At some point I found this one, which is pretty cheap but was back ordered every time I checked (the ones on eBay are too rich for my blood). Finally a couple of months ago it was available again. This a pretty good enclosure for $50, but it’s not the sturdiest rack box I’ve seen. The front panel is made of ~3/16″ thick aluminum, but everything else is probably made of tin or really thin aluminum. That doesn’t bother me since this thing isn’t going on the road. It’s going to sit in a rack. However, the screws in this thing are real POS. So many of them stripped as I undid them, and it wasn’t my fault! They’re just really cheap, weak screws. Here’s what they looked like after unscrewing them just the one time:

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A trip to the hardware store sorted me out. So that’s no big deal.

Cutting holes in the box is probably what kept me from getting moving on this project. I had no idea how to cut big rectangular holes in metal, nor access to tools. In this past year I enjoyed a hacker space, so I now have access to any tool imaginable, and I’m more comfortable working with power tools.

The rectangular holes (on the front for the modules and the back for the IEC inlet) were cut with a jigsaw with a metal blade. It’s really simple. I drilled a hole in each corner of the square, got the jigsaw blade in one, and started cutting. Unfortunately, I chooched out at first and didn’t realize the jigsaw was in scroll mode, so I struggled to keep the first edge I cut straight. The rest were easy once I realized my mistake. It then took me a couple of times of trying to fit the modules through the opening, then enlarging it, and repeat. Once the modules fit in the opening, I marked their mounting holes and went to drilled those using with a drill press.

The holes for the XLR and TRS jacks in the back were drilled on a drill press using a 15/16″ drill bit, but I built up to it with smaller bits. I think I started with something small like 1/4″, then 1/2″, then 15/16″. The holes for mounting the jacks required a little more ingenuity. Placing the jack and marking the holes, then taking it to the drill press wasn’t working for me. The thing is, the drill press would drift a little bit on the surface, and not only that, my markings weren’t always dab smack in the middle of those tiny holes. My solution was to place the jack in the 15/16″ hole and tape it to the surface. Then with the jack in place, I carefully drilled the mounting holes using a whatever was the appropriate bit. I didn’t ruin the jack, so this works for me.

Once everything was drilled and cut I used a file to knock off the burrs. Then a smaller, finer file and 0000 steel wool to smooth it out.

I forgot to take any pictures of the panels drilled out (the front panel isn’t too pretty), but I did snap a few pictures of everything put together.

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It’s not the prettiest, but it’ll do. Now to wire everything inside.
P.S. I need to work on making these posts shorter.