Alesis M1 Active Mk2 User Manual

Speaker Installation
30 M1 Active Reference Manual
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.

Alesis M1 Active Mk2 Specifications

General

Type	Active Studio Monitor
Crossover Frequency	2.8 kHz
Woofer	6.5 inch
Tweeter	1 inch silk dome
Inputs	XLR
Input Impedance	20 kOhms balanced, 10 kOhms unbalanced
Protection	RF interference, output current limiting, over temperature, turn-on/off transient, subsonic filter