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I did some testing of various Oh placements. My room has a low ceiling 6'3 and I find I'm getting some kind of weird comb filtering if I set up OH's to close to the ceiling even though it's completely dead, it's insulation with fabric over it.. not a deliberate treatment setup. Here's some examples of random playing.

It appears as though I've run out of mp3 power.

Here's a mediafire link
http://www.mediafire.com/?boaj4syyyp656

Comments

DonnyThompson Tue, 09/08/2015 - 05:01

Chris Perra, post: 432188, member: 48232 wrote: I find I'm getting some kind of weird comb filtering if I set up OH's to close to the ceiling even though it's completely dead,

All of these examples sound pretty "choked" to me, and aren't what I would personally consider to be "pleasing".

I think that most engineer cats will likely tell you that a 6'3" ceiling is too low to get the OH sounds that most engineers like, and that 8' is the minimum height required to really get that nice OH sound. But, there are variables to that, too...rom dimensions, acoustics, materials used in the construction of the room, etc.

I don't think it's impossible to get "workable" sounds at lower heights, but I do think that a ceiling that low can often present some issues - as you've already discovered - that can make it difficult to get an OH sound that is pleasing.

The type of mics you use will play a big factor in this as well... what were you using? And, can you elaborate a bit on why you chose ORTF? Did you try XY coincidental?

pcrecord Tue, 09/08/2015 - 08:59

What will make a greater difference to your sound is avoiding phases issues. Having a low ceilling to work with myself, even if your placement is perfect, we can get some unwanted reflexions from the ceilling that may sound like comb filter. But phases may be a greater problem that needs our attention.
The first thing I'd check is if both capsule are at equal distance from the snare and from the Bass drum. This means that the OTRF array won't be parallele to the kit (from left to right) but slightly turned so an imaginary line from the bass drum to the snare would be perpendicular to the mics... Hope this makes sens. That way the BD and SN hits both mics at the same time. Then, make someone play and experiment with the distance until it sounds the best.

You can also add a room mic and use less of the OV in the mix

Chris Perra Tue, 09/08/2015 - 11:52

Each mic is the same distance from the snare and kick except the ORTF. I didn't post all the examples on the thread as i ran out of MP3 storage the media fire link has examples of spaced pair, recorderman,and xy as well. Also that's all the drums mics together there is a stereo room in there. The blend isn't the greatest as my ears are usually not happening after I play drums for awhile. There's phazeys from the tom mics ect. It was more of a test regarding the change in mic OH placement than trying to get a great drum sound.

Chris Perra Wed, 09/30/2015 - 10:54

I dunno.. technically if they are the same distance from snare and kick they should be the same volume. For some reason I get more kick in the right than the left. I level match the snare hits. I may be setting up the right mic a little to far to the right. And the snare mic a little too high. Hard to say. Could be my room as well.

pcrecord Wed, 09/30/2015 - 12:59

Chris Perra, post: 432741, member: 48232 wrote: I dunno.. technically if they are the same distance from snare and kick they should be the same volume. For some reason I get more kick in the right than the left. I level match the snare hits. I may be setting up the right mic a little to far to the right. And the snare mic a little too high. Hard to say. Could be my room as well.

The only thing same distance assures is that the bass drum recordings will be in phase.. Not necessary same volume... (Am I wrong ?)

pcrecord Wed, 09/30/2015 - 13:39

bouldersound, post: 432746, member: 38959 wrote: The direct sound itself should be the about same SPL. Complex dispersion patterns of real world sources and room reflections will skew things.

Chris Perra, post: 432747, member: 48232 wrote: I dunno.. if they are the same distance they should be the same volume. They are pointed at different areas. So they won't be the same exact sound but they should be the same volume.. I dunno though.

Without fear of repeating myself : Equal distance will give you in phase signals but if directionnal mics point at different directions, they may not have the same volume comming from the bass drum.. You should get more balanced results with omni mics.. ;)

simman Sat, 10/03/2015 - 09:41

pcrecord, post: 432755, member: 46460 wrote: That's a good point. But I can imagine that if we're doing a jazz or big band recording, overhead would have a bigger place in the mix..

I find that most of my overall drums come from the overheads. If the entire kit doesn't sound good/balanced in overheads (providing the OHs not just cymbal mics) then there is much work to be done. Granted the kick mic(s) provide the majority of the punch of the kick, but IMO the kick in the OHs is an integral part of the overall sound of the kit irrespective of the music style.

Just my .02

Chris Perra Sun, 10/04/2015 - 23:31

I sometimes use a resonator which adds a ton of bottom and volume to the kick. Km 184's have alot of bottom compared to some other mic types.

So far I'm digging the tilted ortf
PCrecord method alot, nice clarity and spread on the cymbals, in this case it works more as overhead than whole kit.

Recorderman works well If I want less cymbals and more drums. But I have less control mixing the ohs without using filters etc.