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BigMic With a Side of Cheese Sticks

Posted by Tom Benedict on 15/11/2017

Some projects just never stop being projects. And sometimes the resulting feature creep isn’t necessarily a bad thing.

A couple of months ago I was trying to find a good acoustic space for doing voice acting, and after pulling my hair out trying to find a quiet spot in my house (which happens to be within twenty feet of a highway) I finally settled on using my Civic. It’s mobile, it’s sound-proofed…ish, and it’s actually a pretty comfy place to sit. I added some acoustic treatment to reduce the remaining standing waves in the car and moved on to the next problem: The electronics.

To make the Civic work as a mobile sound booth I needed a way to mount my scissor arm while still letting it act like a scissor arm. So I machined a bar that would clamp to the headrest uprights on one of the front seats. The bar had a row of threaded holes so I could get coarse left-right adjustment to center the pivot point of the scissor arm, and an upright with a 1/2″ bore for the scissor arm to socket into.

"Cheese Stick" with scissor arm and vocal mic

While I had the thing on the mill I added some 1/4″-20 threaded holes through the top of bar so I could stick a ball head on the opposite side from the scissor arm socket. This let me flip the bar over to use as a mic mount for doing in-car recordings. It’s shown here with my SASS bolted on top.

(As a side note, this isn’t actually the best setup unless you’re trying to record the sound of the car itself. The SASS uses omni capsules, so it picks up every sound in the car.)

"Cheese Stick" with SASS for recording in-car stereo sound

Since the threaded holes were so useful I went back and had a mad drilling session on the mill to pepper the thing with threaded and clear holes for doing… whatever…

That’s when I found out there’s a name for this thing. For the drilled and tapped end of this thing, anyway: It’s a “cheese bar”.

But when I looked up “cheese bar” on Google all I got were these specialty cheese shops that are set up like bars. Go figure. (It’s worth searching on “cheese bar” just to see what these places look like!) Searching on “video cheese bar” got me closer to the mark.

Since mine started life as something else entirely, I hesitate to call it a cheese bar. There’s the headrest clamp at one end and the scissor arm socket at the other. Rather than add confusion to confusion, I decided to call mine something a lot more descriptive: the “cheese stick”.

It’s probably just as bad a term as “cheese bar” when it comes to Google searches, but now I can truthfully say “I’ll have a big mic with a side of cheese sticks!”

Har…

I’ve used the cheesy side of the thing a number of times, now. While doing EQ testing on a bunch of microphones I clamped it to a stand and lined the mics up across the top. Over the last weekend I used it to build something a little more ambitious:

Double-MS setup using the "cheese stick" for fixturing

This is a double-MS setup entirely built using Alice microphones. The center mic is my self-contained MS Alice, but in this case I’m only using the figure-8 for the side channel. The other two mics are a pair of the TSB-25AX Alice mics I built, set up as the front and rear cardioid channels of the double-MS.

I haven’t taken it out in the field yet, but it’s a pretty straightforward setup to put together. I’m hoping to do field testing with it in the next couple of weeks.

Meanwhile I took the test files I made in my house and tested the post processing toolchain I’m planning to use. I started off doing the mid-side decoding by hand, but in the end ran them through the Schoeps Double-MS VST plugin in Reaper, which did an excellent job of generating 5.0 surround sound. If I add an omni on the fourth input of my recorder, I can use it for the LF necessary to do full-blown 5.1 surround.

W00t!

And all because of the feature-creepy cheese stick!

Tom

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