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#1
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pressure buildup rings on Sennheiser mics
I believe the 'pressure build-up' rubber rings that are supplied with the
Sennheiser MKH20 act as a sort of small-scale HF lift when the mic is used in the diffuse field, and perhaps they also serve to increase directionality (or modify the off axis response) slightly also ? Could the same principle be applied usefully to any flat response omni mic used in the diffuse field, or is it specifically applicable to the MKH RF mics....and how much lift could one expect anyway, in real terms ? Thanks for your advice, Ray |
#2
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pressure buildup rings on Sennheiser mics
Ray Thomas wrote:
I believe the 'pressure build-up' rubber rings that are supplied with the Sennheiser MKH20 act as a sort of small-scale HF lift when the mic is used in the diffuse field, and perhaps they also serve to increase directionality (or modify the off axis response) slightly also ? Could the same principle be applied usefully to any flat response omni mic used in the diffuse field, or is it specifically applicable to the MKH RF mics....and how much lift? This pressure treble lift can also used in the direct field, when ever you need more high frequencies. It's an acoustic equalizer. You can use it without problems on "not flat" response omni mics, (diffuse field equalized) if you need more treble. Sennheiser MKH 20 omnidirectional condenser microphone: A pressure build-up ring is included and is used to accentuate high-frequency response. A HF lift is used on other omni microphones in form of a sphere. The pressure lift has nothing to do with the RF principle. DPA sells for his 4006 omnidirectional condenser microphone the "Acoustic Pressure Equaliser" APE L50B http://www.dv247.com/invt/45557/ Schoeps sells for his MK2S omnidirectional condenser microphone the "Slip-on sphere" KA 40 or KA 50. http://www.musicians-gear.com/lin/da...oeps/ka_40.htm Cheers Jens |
#3
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pressure buildup rings on Sennheiser mics
"Eberhard Sengpiel" wrote in message ... Ray Thomas wrote: I believe the 'pressure build-up' rubber rings that are supplied with the Sennheiser MKH20 act as a sort of small-scale HF lift when the mic is used in the diffuse field, and perhaps they also serve to increase directionality (or modify the off axis response) slightly also ? Could the same principle be applied usefully to any flat response omni mic used in the diffuse field, or is it specifically applicable to the MKH RF mics....and how much lift? This pressure treble lift can also used in the direct field, when ever you need more high frequencies. It's an acoustic equalizer. You can use it without problems on "not flat" response omni mics, (diffuse field equalized) if you need more treble. Sennheiser MKH 20 omnidirectional condenser microphone: A pressure build-up ring is included and is used to accentuate high-frequency response. A HF lift is used on other omni microphones in form of a sphere. The pressure lift has nothing to do with the RF principle. DPA sells for his 4006 omnidirectional condenser microphone the "Acoustic Pressure Equaliser" APE L50B http://www.dv247.com/invt/45557/ Schoeps sells for his MK2S omnidirectional condenser microphone the "Slip-on sphere" KA 40 or KA 50. http://www.musicians-gear.com/lin/da...oeps/ka_40.htm Cheers Jens Thanks Jens, I'd seen pics of them before and wondered about their size and construction....pretty hefty price on the DPA spheres of 57 UK pounds ! I imagine the Schoeps items are similar in price. I was wondering if toy balls (eg tennis balls or smoother items), or even rubber squash balls with appropriate holes cut might function ok. I wonder if they'd need to be hard .....like billiard/pool-table balls...or whether a softer foam or plastic or rubber might work just fine, as I imagine it's the reflective surface property which is decisive, rather than mass per se ? Certainly leaves a lot of scope for experimentation. Ray |
#4
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pressure buildup rings on Sennheiser mics
Ray Thomas wrote:
I'd seen pics of them before and wondered about their size and construction....pretty hefty price on the DPA spheres of 57 UK pounds ! I I imagine the Schoeps items are similar in price. I was wondering if toy balls (eg tennis balls or smoother items), or even rubber squash balls with appropriate holes cut might function ok. I wonder if they'd need to be hard ....like billiard/pool-table balls... or whether a softer foam or plastic or rubber might work just fine, as I imagine it's the reflective surface property which is decisive, rather than mass per se ? Certainly leaves a lot of scope for experimentation. It's a good idea to build or find a small wooden ball. The discussion about wood and its warm sound is interesting. "Does wood really sound warm?" at rec.audio.pro http://groups.google.com.au/group/re...24d9332d1370e5 The bigger the ball, the more the treble peak wanders to lower frequencies. Here is a Neumann pressure microphone with spherical acoustic surface M50: http://www.neumann.com/download.php?...d=lect0010.PDF Look how the frequency response changes with objects of different shapes. Cheers Jens |
#5
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pressure buildup rings on Sennheiser mics
x-no-archive:
Jens Rodrigo wrote: Ray Thomas wrote: I'd seen pics of them before and wondered about their size and construction....pretty hefty price on the DPA spheres of 57 UK pounds ! I I imagine the Schoeps items are similar in price. I was wondering if toy balls (eg tennis balls or smoother items), or even rubber squash balls with appropriate holes cut might function ok. I wonder if they'd need to be hard ....like billiard/pool-table balls... or whether a softer foam or plastic or rubber might work just fine, as I imagine it's the reflective surface property which is decisive, rather than mass per se ? Certainly leaves a lot of scope for experimentation. It's a good idea to build or find a small wooden ball. The discussion about wood and its warm sound is interesting. "Does wood really sound warm?" at rec.audio.pro http://groups.google.com.au/group/re...24d9332d1370e5 The bigger the ball, the more the treble peak wanders to lower frequencies. Here is a Neumann pressure microphone with spherical acoustic surface M50: http://www.neumann.com/download.php?...d=lect0010.PDF Look how the frequency response changes with objects of different shapes. Cheers Jens http://www.neumann.com/download.php?...d=lect0010.PDF was interesting... this mic, that many consider to be an excellent mic, has +6dB boost at 10 kHz Mark |
#7
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pressure buildup rings on Sennheiser mics
Ray Thomas wrote:
I believe the 'pressure build-up' rubber rings that are supplied with the Sennheiser MKH20 act as a sort of small-scale HF lift when the mic is used in the diffuse field, and perhaps they also serve to increase directionality (or modify the off axis response) slightly also ? Yes. Could the same principle be applied usefully to any flat response omni mic used in the diffuse field, or is it specifically applicable to the MKH RF mics....and how much lift could one expect anyway, in real terms ? DPA sells ball-shaped "Acoustic Pressure Equalizers" that do similar things, and you can make your own too. They come with frequency response plots showing on-axis and 90' off-axis response changes. If you copy DPA's design and make solid rubber 1" and 2" diameter balls, they should match the same plots that DPA shows for their 1" and 2" balls. They should work with any omni mike. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#8
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pressure buildup rings on Sennheiser mics
wrote:
was interesting... this mic, that many consider to be an excellent mic, has +6dB boost at 10 kHz If you're talking about the M-50.... that's +6dB on axis, but it falls way off once you get off axis. Consequently when you pull it back into the far field, the _overall_ far field response mixing up sounds from all directions is about flat. I'm no fan of the M-50, but it's a useful tool for some things. It's an omni that's designed not to be omni at all at high frequencies. It gives you the low frequency response of an omni capsule while still retaining directionality to create stereo imaging. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#9
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pressure buildup rings on Sennheiser mics
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