The Mackie M•1400/M•1400i is a dual channel, high
output power amplifer that incorporates a number of
unique features including FR “Fast Recovery” design,
high continuous-current output, built-in subwoofer
crossovers, and a T-Design constant-gradient cooling
tunnel for improved cooling effciency and output device
reliability.
ð¯ The M•1400/M•1400i is rated at a continuous out-
put of 250 watts per channel into 8Ω, 425 watts per
channel into 4Ω and 630 watts into 2Ω. In bridge mode
the M•1400/M•1400i is rated at 850 watts into 8Ω
and 1260 watts into 4Ω. Variable low-cut flters on
each channel, with a range from off to 170Hz, enable
tighter bass response and a Constant Directivity Horn
EQ improves high-frequency reproduction. The CD Horn
EQ is 6 dB/octave and its “knee” position is sweepable
from 2kHz to 6kHz. The built-in limiter is channel
independent and helps eliminate clipping. Inputs are
balanced/unbalanced 1/4" and XLR, and XLR thru con-
nectors allow the full-range signal to be routed to another
M•1400/M•1400i. Speaker connections on the M•1400
are Speakon® and binding posts, while speaker connec-
tions on the M•1400i are 1/4" and binding posts.
ð¯ To effectively deal with clipping, an amplifer must
be able to recover almost instantaneously. That is the
defnition of “Fast Recovery”. Rather than using nega-
tive feedback to help control clipping distortion, the
M•1400/M•1400i employs a very sparse amount of
negative feedback. The use of Baker Clamp circuits on
the positive and negative voltage amp stages prevents
saturation (and latching) during periods of overdrive. In
addition, a transistor senses when the Baker Clamp is
active and activates the internal limiting circuits. This
results in no latching, instant recovery from overdriving the amp.