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Alesis M1 ACTIVE Reference Manual page 12

Biamplified reference monitor
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About the Ml Actlye
Inside your new speaker
lf you're in a hurry to get started, skip ahead to Chapter 2,
"Speaker Installation',
for connection and placement tips,
About powered monitons
The M1 Actives combine a speaker and amplifiers in the same compact cabinet.
Powered-monitors
are growing in popularity
over the traditional
siparate amplifier
and speakers for a number of reasons, convenience and ease of hookup beingbnly
one of them. You can cormect a powered speaker directly to any line-level source
(normally, the control room output of a mixer) simply by connecting a patch cord.
Another benefit is improved sound quality.
With carefirl design, $e speaker,
arnplifier and electronic crossover can be optimised for each otherl The ML Actives
arebiamplified,meaning
that low frequencies and high frequencies are handled not
only by separate speakers (the tweeter and the woofer), but by separate amplifiers.
A
pair of Ml Actives contain a total of four power arnplifiers.
Because of the increased
efficiency of biampMication,
these are much louder than a single-channel power
amplifier of the same wattage feeding a passive crossover, as in other designs. New
teclurology makes it possible to make these high-wattage
amplifiers small enough to
fit inside the speaker cabinet, with very little weight or size gain.
Since the Ml Actives are self-powered, DO NOT connect them to
the speaker output of another amplifier (such as a powered mixer
or hi-fi receiver). Connect them only to the line-level outputs of
such devices (+4 dBu nominal, +24 dBu maximum).
Tone
Tonally, every effort has been made to emulate the accurate studio sound of Alesis,
Monitor One but with enhanced low bass and high frequency extension. The nominal
frequency response is 50Hz-20KHz
X2dB. (See Figure 1) Additionally,
the use of
eleckonic 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 will always remain constant.
About the driverc
The M1 Active's 5.5" 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
inteligibility (over polypropylene at 1500 Hz). The non-woven carbon fiber cone,
along with the closed cell synthetic rubber surround, are both nearly impervious to
lo
IFI ACflUE
REFERrc
ilIAilUAL

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