Now, how the heck did that happen?
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Nasty, uncomfortable things!
As my dedicated readers (all three or four of them) are probably aware, Rainbow's End is being sold. It goes on the market, in fact, in a couple of weeks. (BTW, if you want a superb 6-bedroom house in West Seattle, complete with concert hall, ...) In order to present the place in the best light, we have vacated the top two floors, replaced the carpets, and removed the stair lifts. Colleen and I have been sleeping on our sofabed in the Rainbow Room.
Saturday, we moved. Or, rather, went out to a terrific Japanese restaurant in Port Townsend to celebrate the Younger Daughter's birthday, while our moving crew hauled what turned out to be three truckloads of stuff to the apartment. The plan was for us to drive home; pick up (cat) Ticia, (guinea pig) Clea, and (guitar) Plink; come back to an apartment full of boxes; and get settled in. Um..., not quite. In retrospect, leaving Clea at home was the best decision I made all day.
Because the keys, with the all-important fob that gets one into the building and then the elevator, slipped off a box and went through the crack between the elevator and the floor.
Meanwhile, I was driving home. Attempting to follow slightly confusing directions, on a phone that suddenly did not have a visible display! It was particularly confusing because I had missed a turn, and the phone was trying to direct me to turn around. But I didn't know that, either. I pulled off at an intersection in Kitsap that had a convenience store where I could use a bathroom, and switched to Colleen's phone. Fighting, again, with Google Maps, that wanted to direct me to a route it thought was faster, using a ferry. The last thing I needed was to wait an hour or two if I missed the ferry. Of course, I spent nearly that long in a traffic jam in Tacoma.
The traffic jam in Tacoma was where N called me to give me the bad news about the keys. The backup plan was to get buzzed in using the building manager's door code. Which worked fine until I used it too many times figuring out how to keep the garage door open, and said building manager started sending it to voice mail. (I'd thought that it was automated. Nope.) Leaving me outside in the cold, Colleen and Ticia inside waiting for an elevator, and both our phones, plus the litter box that actually had litter in it (we'd sent an empty one ahead), in the van.
After some kind person finally let me in, we proceeded to the apartment. Which is where we determined that we had no phones, no cat litter, and no way of getting back into the elevator after getting them. After meltdown, panic attack, or whatever it was, I proceeded to knock on doors until I found someone who actually opened the door and said they would buzz me in. I arrived downstairs just about the same time as the police, who were investigating an apparent intruder who was knocking on peoples' doors. This is apparently a standard MO for homeless people in the area.
Fortunately, at this point I was well beyond the panic and able to see the humor in the situation, so I had a pleasant conversation with one cop while another went upstairs to knock on my door to confirm with Colleen that we actually lived there.
It wasn't until I got back to the apartment that I took a good look at the phone and realized that the screen wasn't dying, it had just had its brightness turned all the way down. I also figured out that setting up my phone to let people in couldn't be done without having an account set up on dwelo.com. And we had a nice visit from the young lady who had called 911 to report me.
I've lost track of how many anxiety meltdowns I had; at some point I got over the panic and had a nice bout of acute depression.
We have spent the rest of the weekend in the apartment, finding out what's missing and what we have to send back to Rainbow's End to go into the storage pod after all.
Today has been cozy and domestic, sorting through boxes and figuring out which things we actually have room to keep in our apartment's tiny cabinets. And eating veggie, because while I was able to find two cans of crabmeat, the only can-opener we had was a battery-powered one that Colleen had just purchased. Batteries not included.
Oh, and did I mention the scratches I got as I attempted to corner a terrified Ticia and get her into her carrier? Those too.
Meanwhile, here we are.
posted late because my emacs client is flaking out. Probably due to the HTTPS redirection.
Build reports are nice enough. (I wrote up a little errata post yesterday, by the by.) But the real question, of course, is how does the RK-47/990B kit mic sound?
Early impressions are surprisingly good. Even with only the single microphone, there’s a sense of presence and space – even with a purely mono signal path – that I normally have to dual-mic to attain. Also, it has tremendous precision – this is a mic capable of great subtlety. And the amount of gain built into the microphone itself is crazy – this is one spicy meatball of a microphone. That’s something you won’t hear in recordings, but it results in a lower noise floor, which is always good.
Let’s start with some unsubtle differences, ones that’ll show up on laptop speakers. Because while I’ve never liked the MXL-990, they sell a zillion of ’em, and we should make a couple of direct comparisons.
Here’s a snippet of chords from “Lukey,” alternating between the MXL-990 (unaltered factory) and the RK-47/990B. It starts with the MXL-990, then transitions in-song to the RK-47, then back and forth. It ends with the RK-47. It’s a pure mono signal path until prepped for uploading to Soundcloud.
And here’s a short melody, on zouk – again, starting on MXL-990 (factory stock), then RK-47, then back to MXL-990. The last phrase is repeated to allow us to end on the RK-47; also, I wanted that ending bit to be presented on both microphones. The glissando really highlights some of the differences.
But that’s shooting fish in a barrel, as it were. The MXL-990, while popular, is not a good microphone. We should do comparisons to microphones I actually like – let’s say, the M-Audio Nova. At about twice the price of the MXL-990, it’s still a cheap microphone, just one I consider entry-level competent. But it has issues – not the least of which being it’s kind of a noisy beast as these categories of microphones go.
So let’s take the easy swing – here’s a sharply boosted noise level comparison of the RK-47 to the M-Audio Nova, at equivalent gain levels. This is not the noise you’d actually hear; I recorded a silent room at gain appropriate on each microphone for instrument recording, then cranked that recording up 32db for easy noise levels comparison.
Unfortunately, this really requires headphones, because it’s RK-47 on left, Nova on right:
NOT SUBTLE. But also, an easy shot. The Nova is noisy and everybody knows it. There are some mods out there to improve that, but they change the sound a bit in ways I don’t like, so I work with it.
So let’s dig down a bit. Pictured here is a snippet of waveform from a bit of music played, in mono, over my studio monitors, into identically positioned microphones relative to those speakers. These two recordings were made simultaneously.
You’ll note in this highly-zoomed-in render how the RK47 waveform remains clear and unmuddled in these extremely rapid changes, while the Nova’s blurs into a bit of a mush. That’s the sort of thing I’m talking about, and also, the sort of thing you can hear in these very short snippets of horns from a jazz track. This comparison requires headphones, possibly good ones:
They’re short because they must be uncompressed for best comparison – sorry about that – but listen to them a few times and compare. Note how the edges of detail – bits which add flavour – are blurred in the Nova, but retained in the RK-47. Neat, eh?
That out of the way, let’s step up a level in comparator microphones. Oktava 012s are considered very good affordable microphones, particularly strong in their price ranges, and street for a new 012 and one pickup is comparable to the cost of this kit. With a second head (to add a second pickup pattern, as this mic has), it’s a bit more. They’re small-can capacitor instrument mics, rather than large-can, but we’re doing instrument recording, so that’s fair. The components inside – particularly older ones picked up used – can be a bit dodgy, but the design is great and the pickups are great, and you can upgrade the iffy capacitors and the suspect transistor if necessary. I have, of course, done this with mine.
Here’s the intro to “King of Elfland’s Daughter,” on the Oktava 012 (upgraded components) and the RK-47/990B kit. This recording repeats phrases, with the Oktava 012 first, then the RK-47/990B. Pure mono signal path, identical recording setup made within a few minutes of each other, but not simultaneously, as you can’t put two microphones in exactly the same place and I wanted the most equal comparison I could, modulo performance limitations. This probably also requires headphones, as the 012 is a pretty darned precise microphone itself:
Once again, I’m finding that the RK-47 has a real staging advantage. There’s a sense of in-the-room presence with the RK-47 that I can make happen by dual-miking with my other microphones and mixing down, but not directly in mono.
Now, I don’t want to leave the impression that it is BEST AT ALL THINGS, because it’s not. These aren’t the only recordings I made – they’re just ones that show differences best. The first example I found was mandolin – the Nova likes my mandolin better than the RK-47 does. The specific response behaviour and foibles of the Nova work in its favour; a single RK-47 may have more presence and precision than a single Nova, but the Nova recording sounded more musical just the same. I’m sure there will be other examples as well.
In the end, I think this will probably become a heavy-use microphone in my kit. It may even become my go-to mic on the zouk – I need to do some stereo and multi-distance comparisons before I will know that for sure, but it’s looking very good. I also like what it does with piccolo and flute. I haven’t done any playing around with fiddle or drums, and one thing I want to play with is a two-mic setup with the ribbon kit mic I built, to see how those behave together – it’s a mic placement technique I’ve wanted to try for a while, but have never got round to testing. Now is probably the time.
I kind of wish I’d ordered the matched-pair version of this microphone kit. But it would’ve cost twice as much and I couldn’t know in advance I’d like it this much, so.
“World-- I made a mistake. That information I wondered about, that I asked you to look for? I… I didn't realize that it's going to make the subject FURIOUS. Can you lock down everything you scraped together? I told my Da and he rushed to go talk to the subject. This is awful. Worse than awful. I'm sorry I dragged you into it.”
Is monogamy actually better than non-monogamy?
It’s still very much an open question—and one with no clear answers, in part because scientists can’t break free of a certain worldview gripping their field.
Monogamy is so much a part of the emotional makeup of Western culture that even people who study relationships fail to notice their biases towards it, according to research due to be published this week. And that means the very way we study intimacy has some fundamental flaws.
The primacy given to monogamous unions isn’t surprising given the historically patriarchal societies that dominate the world: An economic system predicated upon handing down property from father to son is invested in certainty about paternity and on clear family lines.
But times have changed. Researchers from the University of Michigan set out to determine whether the ways psychologists and other scientists study relationships are geared up to deliver results that—even unconsciously—promote monogamy. They concluded that the very way we study intimacy is problematic.
Terri Conley, the study’s lead author, said that our attitudes to monogamy are “so ingrained as to be invisible.”
“It’s not even that we think about it being right,” she said. “We just see it as the only way.” The way that science assesses relationships has skewed what researchers find, according to the study, due to be published in Perspectives on Psychological Science.
Click headline for story
A bit of errata on the micparts rk-47/990B kit microphone build report yesterday:
First, I didn’t mention that the board kit includes extra capacitors, to be used either for different capsules than I chose, or to tailor the response curve of the microphone. I went for flattest response, but I could’ve had more or less high-end responsiveness by choosing which included tone capacitors to use.
Second, I said that the “omni” switch setting probably wasn’t really going to be actually “omni,” but was more likely to be figure-eight or the like. This was in response to both the capsule design, grille design, and older pictures of the circuit board which appeared to indicate that. In testing, I discovered that I was mistaken – as you can see here, levels as seen in waveforms made by holding a tone generator at the four cardinal directions remain constant. But read on, after the graphs, because there’s a catch:
And here’s the same test, with the mic set to cardioid:
And here’s an M-Audio Nova, same conditions, for comparison:
The total pickup is certainly omnidirectional. But this is not a true basket head on this thing, there are support brackets on the left and right sides, and that does affect tone! High-end harmonics definitely fall off on the left and right sides.
So while it does qualify as an omnidirectional microphone in “omni” mode, I’d have to call it flawed in that mode, and use something else – like an Oktava 012 with the omnidirectional head, which is built for true omnidirectional pickup and does not exhibit this behaviour.
Alternately, I suppose it might be usable in that mode if you’re recording someone who is a tad screechy – aim the wrong side at the performer and presto, fewer high harmonics. EVERYBODY WINS XD
After a few suggestions that I do so, I finally went ahead and splurged for another kit microphone – the micparts RK-47 capsule and amplifier circuit board, both sized to use the dirt-common MXL-990 microphone case.
The MXL-990 is kind of a go-to microphone for people just starting at home recording. I don’t recommend it, even in that role; I think it’s a nasty piece of kit and sounds terrible. Even at $50 – the used price, roughly – you’re better off spending another $40 and getting a low-end AKG or Nova. But it is about the cheapest condenser microphone with XLR out that you could pretend to treat like a real mic, and that has meant a thriving mod community.
Here are the basic parts included with the kit. I didn’t have the capsule out – the actual thing that vibrates to sound – because it needed to stay in its protective box until installation.
This is technically an MXL-990 mod, one wherein nothing is kept but the case and socket. It’s also a nontrivial assembly, so I’m going to talk about building in this one, and have some sound samples in the next.
You can see the instruction booklet over on the right. It’s quite clear, and has some important commentary, about extra care being needed not to touch certain components any more than you have to, and which parts are particularly sensitive to heat. It does not say up front that about 25 pages in it will suggest that you use a couple of chemical products if you have them, so I ended up having to order some purple loctite and conformance coating.
If I had it to do again, I probably wouldn’t order the conformance coating, because the MDA sheet on that is not attractive. But now that I have it, I might as well use it. If anyone local needs some, let me know.
As you can see, the board is clearly labelled:
For the most part, this is one of those insert-and-solder projects. The tolerances are reasonable, though they were emphatic about working at a meaningfully lower iron temperature than I prefer. If you use 60/40 lead solder, their temperature would be fine.
(I ran at 350°C, which is a little hotter than they recommend, but I use silver solder, and it seemed to work out. In these cases, I solder only one leg from each component, then cycle back to the start, and do the second leg, then cycle around again for the third if necessary. This lets the heat that is building up in the component itself dissipate, reducing peak temperature inside the component. This is most important with semiconductors, usually – particularly transistors.)
They also have you cleaning the board with isopropyl alcohol regularly, and suggest cleaning your iron between each solder point. I don’t know if they just meant wiping the tip or actually using the sal ammoniac, so I kind of compromised. (Though for the most sensitive components, I did do a complete sal ammoniac cleaning between each point.)
This is the board essentially complete:
The process is a bit fiddly, I have to say. They’re quite strict in the manual about flux cleanup and so on, so you’ll end up using tweezers and foam swabs and lint-free cloth and and and. Still, with kits this expensive, it’s best not to take chances.
You might note that the connections on the switch are not made yet; that’s because you’re wiring two of the leads from the pickup to the circuit at these points directly. Those connections are where they’re most persnickety about how things are to be done – but I followed their directions precisely and it worked out.
Here’s the new RK-47 pickup canister in its mount:
I’m liking this canister already, at this point. I know, I know, “good feel” is silly, but this capacitor pickup has a good materials feel to it. The mounting system you see in use is also partly a replacement – the original was a ring mount system; this is a saddle, larger, and is also where you need the threadlocker. I’m not convinced MXL used a threadlocker on that post, but I see how the larger, heavier pickup does kind of call for it.
Once the board is mounted back into the bracket and grille, you end up with this:
And once you’ve wired the three leads from the pickup and the three from the XLR connector, you’re pretty much ready to test.
I did have an initially-worrying test result: voltage at the primary test point – the one you conduct before any audio checks – was running high. The manual had a lot to say about what you’ve probably done wrong if it runs low, and further tests to isolate your mistake, and spends a couple of pages going on making sure you’ve got a bare minimum of 45V going to the exciter, with a preferred minimum of 50v, and an “operating range” of 50-62v, where 60v is optimal.
The range on mine ran from a low of 62.45v to a high of around 68v, so I was concerned. But it turns out the actual operating range is 50v-70v – they just don’t expect anybody to be able to get to the upper end. Support even said that if I was mostly recording quiet material I could safely crank it up to 65v full-time for an even hotter pickup, but, heh, that’s not what I generally do, so I’ll leave it where it is. XD
As for the sticker – I put “MP-SVS” over the “MXL” logo because at this point, it’s not an MXL microphone in any way, so why would I keep that? It’s just silly. MP-SVS is MicParts-Supervillain Studios, naturally. I also changed the model number to RK-47, after the canister number.
I did not mention before that this is a switch-selectable dual-pickup-pattern microphone:
That will let me try an instrument miking style I’ve wanted to try for a while anyway. The only downside of using an existing microphone housing is that the switch has to live on the inside, and you have to unscrew the bottom of the housing to get to it. But it’s just twist-open, so not really an issue.
Regardless, as you can see, the switch says “cart” (for cartioid) and “omni” (for omnidirectional), but I think I’m pretty sure it’s really more figure-eight, given the construction of everything and what the switch does. And pictures in the manual actually agree with that – the printing on the board is different in the photos.
An optional modification to the case involves coating the lower half with silicate caulk (or a couple of other listed materials). I, of course, did that too:
The idea is that this reduces case resonance. Does it? I dunno, I just went ahead and did it because silicon caulk is dirt cheap – the local hardware store down the hill had a small tube for three dollars. The lack of silicon at the top is necessary – the upper part of the case scrapes into the lower half quite tightly, and any added material would be scraped off right away. As you can probably see, it’s even scraping off its own coating.
This is what it looks like all put together, and put in the standard MXL-990 shock mount:
All in all, I’d call it a straightforward well-documented build. It’s far from the most difficult I’ve done. Not a good starter project, but if you’re reasonably good with a soldering iron, you’re going to be fine.
And this is already a long post, so I’ve decided to make it Part 1 of 2, and will talk about the important part – what the result sounds like – next time. Spoiler: a whole hell of a lot better than an MXL-990. But it also has audibly (and visibly, in the waveform) finer and more precise pickup than, say, my Novas.
I’m also going to see if I can’t do some comparisons to my Oktava 319 and possibly the (already-improved via mods) Oktava 012s as well before next time. That, too, might be interesting.
Have a good weekend, everybody!