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Author Topic: XY ???  (Read 10987 times)

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Offline Wes

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Re:XY ???
« Reply #15 on: June 19, 2003, 05:41:40 PM »
i'm by no means an audio engineer.  I'm a mechanical engineer, at least almost..  about a year and a half of school left.

So heres a serious question.  XY should always be run at 90?  If I'm far from the sound source i usually tend to close the angle a bit making it less than 90, i am sometimes pleased with my tapes and other times not.  So is the 90 degree angle really that important to produce the stereo image?
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Offline rokpunk

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Re:XY ???
« Reply #16 on: June 19, 2003, 05:45:08 PM »
This mic pattern  is simulating the x-y axes on a graph. The capsules of the mics are placed in very close proximity and pointed at or around a 90 degree angle (coincident pair.) This placement eliminates phase problems because the wave hits both mics at the same time.
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again, your showing your cluelessness.


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Offline twoodruff

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Re:XY ???
« Reply #17 on: June 19, 2003, 05:45:54 PM »
wes you used to run v2>ad2k+, you can do whatever you want from now on
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Offline Wes

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Re:XY ???
« Reply #18 on: June 19, 2003, 05:47:01 PM »
wouldn't the wave hit the mic at the same time no matter what as long as they share the same vertical axis? i don't think i'm following
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Offline Wes

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Re:XY ???
« Reply #19 on: June 19, 2003, 05:51:43 PM »
i dunno trey, i'm not real pleased with that allstars from hal and mals..  you say yours sounds good?
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Offline twoodruff

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Re:XY ???
« Reply #20 on: June 19, 2003, 05:55:14 PM »
i know its xy with the hypers, you ll learn one day
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Offline rokpunk

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Re:XY ???
« Reply #21 on: June 19, 2003, 05:55:33 PM »
This is from Modern Recording Techniques by Huber and Runstein :

The XY technique is an intensity-dependent system; it uses only the cue of an amplitude to discriminate direction. With the XY technique, two microphones of the exact same type are placed with their grills as close together as possible (without touching) and facing at right angles to each other. The midpoint, or 45 degree angle, between the two mics is faced toward the musical instrument and the mic outputs are panned left and right. Even though the two mics are placed together, the stereo imaging is excellent - often better than when using the spaced pair method. There is the added advantage of having no appreciable phase problems due to the close proximity of the mics. The angles of the two mics may be changed to fit the occasion, with the preferred angles being from 90 degrees to 120 degrees. The generally accepted polar pattern is cardioid, although two crossed bi-directional mics can give excellent ambient results.

Help any?
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again, your showing your cluelessness.


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And rules all creation........

Offline Wes

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Re:XY ???
« Reply #22 on: June 19, 2003, 06:00:29 PM »
yeah.  that really clears it up.  i've heard that you are ONLY suspose to run xy 90 degree and I just didn't agree.   +t.  good info
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Offline jlykos

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Re:XY ???
« Reply #23 on: June 19, 2003, 06:17:30 PM »
They're both the same. Just make sure you have your cables switched (i.e the mic on the right side should be the left channel because it is pointed to the left).

True, true.  I have a crystal-clear on-stage tape of Garaj Mahal run XY.  Only problem is, the entire soundstage is BACKWARDS!  Switched cables suck.
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Offline zhianosatch

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Re:XY ???
« Reply #24 on: June 19, 2003, 06:42:42 PM »
    X         look at the X and remember your trigonometry.  2 angles look to be about 90 degrees while the other 2 look to be about 110~120

2(90) + 2(120) = 420*
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Offline Wes

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Re:XY ???
« Reply #25 on: June 19, 2003, 07:18:47 PM »
jlykos,
just about any music editing software will let you swap channels.  i know for sure wavelab does
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Offline Simp-Dawg

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Re:XY ???
« Reply #26 on: June 19, 2003, 07:49:10 PM »
    X         look at the X and remember your trigonometry.  2 angles look to be about 90 degrees while the other 2 look to be about 110~120

2(90) + 2(120) = 420*
That's one bad-ass circle, lemme tell you ;)
Armen

now that's MY kind of math!   :smoking: +T!!!
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Offline Swampy

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Re:XY ???
« Reply #27 on: June 19, 2003, 09:26:51 PM »
I think Alex's question has less to do with the angle - in both cases the mic caps are 90º offset from each other - and more to do with the the vertical capsule alignment with respect to the opposite mic.  See my previous post above.

Yep. Its pretty funny how stuff ends up on this board! Thanks for the help guys!

Offline Swampy

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Re:XY ???
« Reply #28 on: June 20, 2003, 10:43:28 AM »
Well I tried XY last night, and I was suprised. XY sounds a lot better than I thought it would, thanks!
« Last Edit: June 20, 2003, 10:43:58 AM by AlexHerd »

Offline twoodruff

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Re:XY ???
« Reply #29 on: June 20, 2003, 10:49:11 AM »
its all about the angle  ;)




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