Gear / Technical Help > Microphones & Setup
Relationships between spaced omnis and center mic
rocksuitcase:
--- Quote from: heathen on June 20, 2017, 11:27:52 AM ---That's a cool setup rocksuitcase. What are the outer mics? Looks like maybe AKG bodies, but capsules that are at a right angle? Pardon my ignorance.
I'd be curious to hear a sample of one of your recordings...are there any on LMA?
--- End quote ---
Outside are AKG c460 bodies with ck22 Omni caps (the flattest Omni AKG made) the angles are the A-60 "knuckle" adapters which offer the swivel angling. We use the swivel to gain about 10 cm on the outside spread.
The center in that pic is an old Beyer M201e, but we typically run AKG ck61 actives in center/rear.
Here is one:
https://archive.org/details/steepcanyon2016-07-14.24.ck22ck414.flac (this one has AKG 414 cards in the center)
One more:
https://archive.org/details/erevival2016-07-16.ck22ck61
We ran the centers with both AKGck61 and AKGck8 facing fwd. In mixdown, I chose the ck61 only. But it is nice to have options. (photo is of the two fwd facing mics in this config)
heathen:
Here's a sample of a recording I made with my current setup over the weekend, I'd appreciate any feedback (especially as to whether there are any sonic issues from the center being relatively far forward from the sides...I didn't apply any delay in post): https://we.tl/HH4AeXxm70 (WeTransfer download link).
Details...
Source: Church Audio CA 14 omnis spaced ~9 inches, Church Audio Ugly Battery Box; AKG 460/ck61 (center, about 8 inches forward of the omnis); Tascam DR-70D (24/96 wav)
Location: Stand ~7 feet high, ~5 feet right of center, next to sound/light booth
The crowd was pretty loud and talkative, so you may want to skip to the middle of the track. Also, there was a wall not far to my right, but it was relatively open all to the left (I didn't have a lot of say in where I was able to put up my stand). I only had the omnis spread ~9 inches because if I went further that would put the right side that much closer to the wall, and potentially in the light guy's face.
In post I panned the omnis hard left and right, and gave them a tiny bit of gain. I gave the left side 1 dB of gain more than the right because of the wall issue.
noahbickart:
--- Quote from: heathen on June 20, 2017, 10:37:05 AM ---
--- Quote from: Gutbucket on June 19, 2017, 07:17:20 PM ---The answer ranges between all mics in a single horizontal line, to the center mic being moved well forward of the omnis (with compensating delay applied to it)
--- End quote ---
How do I figure out how much compensating delay to apply to the center mic?
--- End quote ---
Speed of sound is ~1120 feet per second depending on altitude and temperature. So measure the distance....
There's an online calculator here: http://www.doctorproaudio.com/doctor/calculadores_en.htm
Follow links for an iOS app as well.
rocksuitcase:
--- Quote from: heathen on June 21, 2017, 12:21:57 AM ---Here's a sample of a recording I made with my current setup over the weekend, I'd appreciate any feedback (especially as to whether there are any sonic issues from the center being relatively far forward from the sides...I didn't apply any delay in post): https://we.tl/HH4AeXxm70 (WeTransfer download link).
Details...
Source: Church Audio CA 14 omnis spaced ~9 inches, Church Audio Ugly Battery Box; AKG 460/ck61 (center, about 8 inches forward of the omnis); Tascam DR-70D (24/96 wav)
Location: Stand ~7 feet high, ~5 feet right of center, next to sound/light booth
The crowd was pretty loud and talkative, so you may want to skip to the middle of the track. Also, there was a wall not far to my right, but it was relatively open all to the left (I didn't have a lot of say in where I was able to put up my stand). I only had the omnis spread ~9 inches because if I went further that would put the right side that much closer to the wall, and potentially in the light guy's face.
In post I panned the omnis hard left and right, and gave them a tiny bit of gain. I gave the left side 1 dB of gain more than the right because of the wall issue.
--- End quote ---
Heath, that link goes to a file titled A Live One 20140617 Theme from the Bottom 10:05 tracktime. is it possible this is not the file you intended to post for us?
heathen:
--- Quote from: rocksuitcase on June 21, 2017, 01:29:24 PM ---Heath, that link goes to a file titled A Live One 20140617 Theme from the Bottom 10:05 tracktime. is it possible this is not the file you intended to post for us?
--- End quote ---
No, that's the one I intended to post. Why?
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