Double M/S

“Double M/S“ Surround with
Double-MS Set

• requires only three microphones and channels for 5.0 surround
• very small, lightweight array
• can be well protected against wind (with “fur” Windjammer)
• allows post-production processing (if matrixing takes place after the recording)

WSR DMS LU	Windjammer, fur cover for enhancing the protection against wind noise
	Surround playback arrangement: see ITU 775-1 In place of the DMS Splitter, an AK DMS 3U adapter cable (XLR-7F to three XMR-3M; 50 cm long) can be used.

“Double M/S“ is an improved version of the well-known M/S stereo recording technique. In addition to a front-facing cardioid or supercardioid “mid“ microphone and a figure-8 “side“ microphone, a rear-facing directional microphone is set up. The front- and rear-facing microphones share the signals of the figure-8 microphone so as to form two complete, back-to-back M/S systems. One M/S system then provides the three front channels (the center channel signal being provided directly by the mid microphone of the front system), while the other system provides the two surround channels. A double M/S arrangement of this kind allows flexible processing of the stereo surround image width and post-production adjustment, just as with two-channel M/S recording.

Doppel-MS von oben gesehen (zur besseren Ubersichtlichkeit nicht ubereinander (koinzident) gezeichnet).

The Double-MS Set consists of:

• WSR DMS LU: a special shock mount with basket-type windscreen and a cable adapter from three Lemo sockets to an XLR-7M output connector
• an XLR-7 extension cable (5 m long)
• three CCM-L miniature microphones (2×cardioid CCM 4 VLg and 1×figure-8 CCM 8 Lg) in a double M/S configuration,
• an electrically passive DMS-Splitter*
• a Windjammer (fur cover for enhancing the protection against wind noise)

Instead of the CCM 4VL, a CCM 41VL supercardioid can be ordered for an additional charge.

*The DMS-Splitter is a passive device that simplifies connecting a double M/S array to phantom-powered preamplifiers with matrix circuitry (e.g. 2× SCHOEPS VMS 5 U) or to the inputs of a mixer. It divides the signals from the three microphones to five outputs (the center channel plus the two M/S pairs, with two of the microphones serving dual functions), while preventing any overlap in the phantom powering of the microphones from the inputs to which it is connected.

Technical details (PDF) on the Double M/S recording arrangement.

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