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Mackie SRM 450 Monitor/Loudspeaker System 
Incredible
bi-amplified,
active cross over, servo controlled, auto-on monitors that are loud enough to rock
a pretty big room. I’ve played with 4000 watt systems in the past that were
not this loud. Unbelievable bass, brilliant clarity, and two only take up half
my trunk. The two that were just added to the system keep me cranking in
stereo! If you didn't understand the first sentence, look below for
definitions.
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Bi-amplified
= Two amplifiers power this speaker, a 300 watt for the bottom with a
540 watt peak, and a 100 for the top with a 150 peak. Each amp has its
own compressor circuit that acts when the input signal is large enough
to cause clipping, distortion, and excessive voice coil heat. The
compressor will automatically decrease the input signal to a safe
level. The compressor in the low frequency amp works independently
from the other amp. The low frequency amplifier also has a sweeping
filter. This will automatically move the low cut off frequency up or
down depending on the amp output. If the amplifier is below clipping,
the low frequency cut-off point is 55Hz. As it approaches clipping,
this shifts up smoothly to 120Hz, providing more power reserves and
less distortion before clipping. This happens quickly and
continuously, protecting the amp and woofer, and reducing any
noticeable distortion. 
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Active
Crossover = The built in crossover is a 24 dB/octave Linkwitz-Riley
design, whish includes: absolutely flat frequency response throughout
the bandpass, without the characteristic ripple near the crossover
point exhibited by other designs; sharp 24 dB per octave roll off of
the filters ensures that the transducers aren't reproducing
frequencies outside of their capabilities; the acoustic sum of the two
driver responses is unity at the crossover frequency, resulting in
perfect phase response, with phenomenal accuracy, even 20 feet
away! 
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Servo-
Controlled = The low frequency amp uses a servo feedback loop which
senses the current flowing in the woofer coil. This controls the low
frequency response and maintains low distortion at high output levels.
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Auto-On
= turns the speaker on and off automatically based on signal
presence.
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The
Tranducers = feature a 12" high power low frequency woofer and a
1.75" titanium diaphragm high output precision compression
driver.
To see my CDs just click: View
CD.
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