A Tri-Mono package for the ELA M 260 system consists of three ELA M 260 microphones, a 3-channel power supply capable of powering all three microphones, three elastic shock mounts, and a set of three 10-meter AccuSound TX-7 tube mic cables with right angle XLR connectors. In order to foster an element of creativity, all three capsule systems (TK60 cardioid, TK61 omnidirectional, and TK62 hypercardioid) are included in the package, along with a set of diffuse field spheres.

Engineers who recorded classical music for Decca Records pioneered the Decca Tree microphone placement technique in the early 1950s when they wanted a strong sense of stereo image and balanced coverage of an orchestra, as the conductor might have heard while he led the orchestra.

The technique features three omnidirectional microphones placed in a reverse "T" configuration, roughly above the head of the conductor. The "left" and "right" are positioned behind the conductor while the "center" microphone hangs in front of the conductor.

In addition to orchestral recording applications, the Decca Tree configuration can be an invaluable component to more contemporary recordings for drum applications and to gain an overall "band in a room" kind of atmosphere to your recording process.