Alesis M1Active MKII User Manual - Page 31
Lacement Of The Center, Ctive, Speaker, In The Studio
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Surround Sound PLACEMENT OF THE CENTER M1 ACTIVE MK2 SPEAKER IN THE STUDIO The left, center and right speakers should all be placed in an arc so that the distance of all drivers to the listener is identical (see page 29). The equilateral listening triangle as described earlier for stereo (two-channel) playback should be retained, with the center speaker placed vertically in the center, exactly between the left and right (vertical) M1 Active Mk2s. It does not matter what type of M1 Active Mk2 is used for the center speaker (tweeter in or tweeter out). Since M1 Active Mk2s are sold as pairs, a 5-channel system requires the purchase of a single speaker, breaking up a pair. Some dealers may request that you purchase in pairs only; others may be able to arrange purchase of a single unit. For the rear channels, we recommend a mirror-image pair, although this is less critical than in the front. As discussed above, for music-only recording the signal level to the center channel will be attenuated over the levels of the left and right speakers. As a starting point we would recommend that you set the center channel level -6dB below the left and right channels. To get these levels fairly accurate a white or pink noise source (such as from a test CD) is very helpful along with an inexpensive sound level meter (such as the Radio Shack cat. no. 33-2050). If you are recording audio-for-video, the center channel signal level should be the same as left and right channels. The left, center, right speaker layout configuration can remain the same as for an audio-only mix. With all front speakers operating at equal levels, the "sweet spot" listening area will become very large but the "wall-of-mono" effect mentioned above (in regards to music) will be of little consequence since most of the dialogue will be mixed specifically into the center channel. M1 Active Mk2 Reference Manual 33