Getting ORTF drum overheads right is often the difference between a flat drum sound and one that sits confidently in the center of a mix. This specific stereo technique, named after the Office de Radiodiffusion Télévision Française, uses a spaced pair of cardioid microphones positioned just above the kit to capture a realistic and spacious image. The magic lies in the tight 17-centimeter gap between the capsules and the 110-degree pickup pattern, which leverages both level and time differences to create a wide yet coherent stereo field without excessive phase issues.
Understanding the ORTF Configuration
The ORTF setup is deceptively simple, relying on precise geometry to solve a complex acoustic problem. Two identical directional microphones are aimed roughly at the center of the drum kit, with their capsules mounted 17 centimeters apart. This specific spacing mimics the human ear’s distance, while the 110-degree angle between the microphones’ pickup patterns allows for effective stereo imaging. The result is a stereo image that feels natural and proportional, translating well across different playback systems, from club speakers to headphones.
Microphone Selection and Placement
Choosing the right microphone is crucial for a great ORTF drum overheads sound. While classic large-diaphragm condensers are popular, small-diaphragm condensers often excel in this role due to their superior transient response and ability to handle high sound pressure levels without distortion. Placement is just as important as the mic choice; the pair should be positioned about 1 to 1.5 meters above the kit, angled down to capture the snare, toms, and cymbals evenly. Experimenting with the exact height and angle allows you to tailor the capture to the specific kit and room acoustics.
Advantages Over Other Techniques
Compared to other overhead methods, ORTF offers a compelling middle ground between intimacy and width. Unlike the coincident X/Y technique, which can sound somewhat narrow in comparison, ORTF provides a genuine sense of room and space due to its physical spacing. This makes it an excellent choice for genres like jazz, rock, and pop where a natural, live drum sound is desired. Furthermore, the stereo image it produces is stable and predictable, reducing the frustration of phase cancellation that can plague other spaced-pair techniques when the signal is summed to mono.
Creates a wide, natural-sounding stereo image that mimics human hearing.
Offers better off-axis rejection than X/Y techniques, reducing cymbal bleed from the sides.
More resistant to phase issues when compared to other spaced-pair methods.
Captures a realistic sense of kit depth and room ambiance.
Works exceptionally well for recording entire drum kits in live settings.
Practical Tips for Implementation To get the most out of your ORTF overheads, attention to detail is key. Ensure both microphones are powered correctly and that your preamp settings are consistent to maintain a balanced stereo image. Using a pop filter or small shield between the kits can help minimize direct hits on the capsules from the hi-hat or snare. Most importantly, always listen in the context of the full mix; the overheads should complement the kick and snare, not overpower them, creating a cohesive and powerful drum sound. Common Challenges and Solutions
To get the most out of your ORTF overheads, attention to detail is key. Ensure both microphones are powered correctly and that your preamp settings are consistent to maintain a balanced stereo image. Using a pop filter or small shield between the kits can help minimize direct hits on the capsules from the hi-hat or snare. Most importantly, always listen in the context of the full mix; the overheads should complement the kick and snare, not overpower them, creating a cohesive and powerful drum sound.
No technique is without its hurdles, and ORTF drum overheads are no exception. One common issue is a hollow or phasey sound when the mono compatibility of the track is checked. This can often be remedied by slightly adjusting the microphone angle or moving the entire pair closer to or farther from the kit. Another challenge is capturing enough kick drum sound; this can be solved by adding a dedicated kick microphone or carefully angling the overheads lower to pick up more of the beater's impact without sacrificing the cymbal texture.
