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The Basement
Two pianos, one microphone
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<blockquote data-quote="Geoff Doane" data-source="post: 58468" data-attributes="member: 1155"><p>Re: Two pianos, one microphone</p><p></p><p></p><p></p><p>OK, maybe I'll be third time lucky trying to reply to this thread. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" />~<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" />~:smile:</p><p></p><p>The two sides of a figure-8 mic are indeed out of polarity with each other. A sound arriving at 90° off axis enters both sides equally, and is cancelled out. A ribbon mic does this mechanically. A condenser like a C-414, has two diaphragms back to back. In Figure-8 mode, the front diaphragm is polarized with +60V, the back is at -60V. A sound at 90° is cancelled electrically. For an omni pattern both sides are polarized at +60V. You can get any intermediate pattern by polarizing the back diaphragm at a voltage between -60 and +60V. Grounding the back gives you a cardioid pattern.</p><p></p><p></p><p>I've used a single C-414 in figure-8 before to mic a grand piano with decent results. It was set up above the hammers, one side facing left, and the other right. It was just a matter of finding the spot that gave the desired balance between high and low notes.</p><p></p><p>GTD</p></blockquote><p></p>
[QUOTE="Geoff Doane, post: 58468, member: 1155"] Re: Two pianos, one microphone OK, maybe I'll be third time lucky trying to reply to this thread. :)~:-)~:smile: The two sides of a figure-8 mic are indeed out of polarity with each other. A sound arriving at 90° off axis enters both sides equally, and is cancelled out. A ribbon mic does this mechanically. A condenser like a C-414, has two diaphragms back to back. In Figure-8 mode, the front diaphragm is polarized with +60V, the back is at -60V. A sound at 90° is cancelled electrically. For an omni pattern both sides are polarized at +60V. You can get any intermediate pattern by polarizing the back diaphragm at a voltage between -60 and +60V. Grounding the back gives you a cardioid pattern. I've used a single C-414 in figure-8 before to mic a grand piano with decent results. It was set up above the hammers, one side facing left, and the other right. It was just a matter of finding the spot that gave the desired balance between high and low notes. GTD [/QUOTE]
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