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About the M1 Active Mk2
M1 Active Mk2 Reference Manual 11
TONE
Tonally, every effort has been made to create a powered monitor that is as
linear as possible, representing a flat frequency response from 50Hz to 20KHz
±2dB. (see p. 21) Additionally, the use of electronic crossovers within the
critical upper midrange frequencies has reduced phase and time delay
anomalies often associated with passive crossovers. By including discrete
woofer and tweeter amplifiers and application-specific electronic high and
low pass crossover filters in the same enclosure the tonal accuracy of the M1
Active Mk2 will always remain constant.
ABOUT THE DRIVERS
The M1 Active Mk2’s 6.5” woofer cone is made of proprietary non-woven
carbon fiber. This material is 25% lighter than polypropylene with twice the
stiffness for quicker transient response in the low-to-midbass region and
vastly improved midrange intelligibility (over polypropylene at 2000 Hz).
The non-woven carbon fiber cone, along with the closed cell synthetic rubber
surround, are both nearly impervious to ozone, direct sunlight, heat and
humidity. Therefore, after an initial break-in period, the sound should remain
virtually unchanged for the life of the product.
Alesis’ proprietary-design tweeter features a special wave guide baffle to
improve polar response, a silk dome, and low viscosity ferrofluid formulated
specifically to retain the best balance of transient response to power handling.
The shielded tweeter utilizes a vented pole piece with a separate rear
chamber to lower the free air resonance. The low 2000Hz crossover point of
this tweeter produces a very widely dispersed, low-distortion signal within
the critical midrange frequencies. It is these frequencies which are often the
most problematic to get “right” during a mix. The tweeter is designed for an
optimal response for non-fatiguing, long term, high level, nearfield
mixdowns. This design results in a flat, linear mix when played back on home
or car systems from appropriate distances.
MAGNETIC SHIELDING
Your M1 Active Mk2s are at home in recording environments wherein video
is a major component. They are magnetically shielded for use in fairly close
proximity (3” minimum) to a computer monitor or video screen. (Non-
shielded components can make the colors of a screen “smear” or appear out
of focus if the speaker is too close.) Magnetic shielding was designed into
both the woofer and the tweeter from the beginning so that the system
exhibits about low magnetic leakage. Shielding of both the woofer and the
tweeter is accomplished by the use of a second opposing-field-oriented
“bucking” magnet.