Alesis M1Active MKII User Manual - Page 28
Speaker Installation, VOIDING DAMAGE - powered studio monitors
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Speaker Installation AVOIDING DAMAGE The best protection against speaker failure is to mix at a reasonable listening level. With a +4 dBu input and the input level control set to "6", the M1 Active Mk2 speakers produce a sound pressure level (SPL) of 85 decibels at 1 meter, which is a good working level for mixing. At maximum output before clipping, they can generate peak levels ≥ 118 dB SPL at one meter - a level which may cause hearing loss after prolonged exposure. While the biamplified design of the M1 Active Mk2 avoids the common "blown tweeter" problem of conventional designs (when a broadband amplifier clips on a bass note, it sends unusually high energy to the tweeter, which tries to reproduce the square wave), it is not invulnerable. If you need higher power levels, you are not using the speaker in a near-field application. For extremely loud mid-field and far-field monitoring, we recommend the Alesis Monitor Two speaker with a 300-watt per channel amplifier. Many studios will check recordings on both systems, alternating to avoid ear fatigue and to gain perspective on the mix. 30 M1 Active Reference Manual