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Always observe the red LIMIT LED on the amplifier panel. This LED
lights when a signal is clipping and the compressor-limiter is activated.
The MATRIX-1500 amplifiers employ a sophisticated limiter circuitry,
which monitors signal condition at all three amplifier channels and
compresses the output signal when necessary to protect the
loudpseakers from damages.
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Limiter circuitry works very unobtrusively; you may not even notice
when it activates. It may prompt you to push input signal more, but it
is a good practice to have red LIMIT LEDs blink occasionally and not
constantly. A constant LIMIT LED light indicates a gross overloading
condition and should be avoided. Reduce the signal level if the LIMIT
LED lights or blinks constantly.
NOTE that LEVEL control provides about 12dB attenuation in middle
position. You will find that in most cases the best sound (lowest
distortions and lowest noise) will be achieved when LEVEL controls are
set somewhere between middle and full clockwise position.
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PHASE SWITCH
The MATRIX-1500 has a PHASE switch. When the PHASE switch is set
to 0, the polarity is such that a positive input will cause the subwoofer
cone to push outward. When set to 180, the input signal's polarity
is reversed and a positive input will cause the loudspeaker's cone to
pull inward.
When all of the loudspeakers in a system are operating with the same
polarity, a positive polarity signal causes the excursion (the forward
motion) of all loudspeaker cones. In turn, this sets up a positive
reinforcement of the sound wave (each loudspeaker reinforces the
output of the other loudspeakers). This effect refers to the speakers
being "in phase" The effect of proper "phasing" is most noticeable in
low (bass) frequencies. If a loudspeaker's phase is incorrect, its cone
moves inward while the properly phased loudspeaker's cones move
outward. The inward movement, of the improperly phased loudspeaker,
will effectively cancel the bass response of a similarly-sized driver in
the system. This results in a reduction of the bass output.
It is important to maintain correct phasing in a loudspeaker system, in
order to operate at maximum performance. Incorrect polarity can be
caused by incorrectly wired cables, interconnecting cables, and mixer
functions set incorrectly.
Phasing is also influenced by the mutual positioning and orientation of
the loudspeakers in a system. It is possible to have proper polarization
(of all cables and equipment) and still achieve better bass response
by having the subwoofer set to reverse polarity. Bass response also will
change with the listener's position in the room. During testing, monitor
the bass response from several different locations in the venue.
How to Use the PHASE Switch:
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Start with the PHASE switch in the 0 position. Next, with your system
playing at or near its expected operating level, change the polarity of the
subwoofer. Walk around the venue and evaluate the overall bass response,
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and select the phase setting that produces the best overall bass response.
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LEFT SPEAKER OUTPUT
Use a cable with Speakon to Speakon connectors to connect
from the LEFT output of the MATRIX-1500 amplifier to the
satellite speaker positioned to the left of your subwoofer.
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RIGHT SPEAKER OUTPUT
Use a cable with Speakon to Speakon connectors to connect
from the RIGHT output of the MATRIX-1500 amplifie to the
satellite speaker positioned to the left of your subwoofer.
NOTE - The cables are connected to 1+ and 1- of the Speakon
connectors.
BBE LF CONTOUR
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Use this knob to adjust the low frequency portion of BBE processing.
The LF Contour will process the subwoofer and satellite speakers and
enhance the bass output of your system.
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BBE HF PROCESS
Use this knob to adjust the high frequency portion of the BBE processing.
The HF PROCESS will provide clearer mids and highs and will enhance
the vocal reproduction of the MATRIX-1500 satellite speakers.
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BBE ON/OFF SWITCH
This switch is used to activate the BBE processing built into your
MATRIX-1500 system. The switch will illuminate when
turned ON clearly indicating that the BBE processing is activated.
BBE processes both the sound of subwoofer itself, as well as the
satellite speakers.
BBE SONIC MAXIMIZER
Benefits: The BBE Sonic Maximizer circuitry built-in to the
MATRIX-1500 takes already great sounding systems to the next level
by adding punch and depth that can be both heard and felt. BBE
processing will dramatically improve the clarity and intelligibility of
vocals, musical instruments and will add overall depth to the audio
program. A control for both the LF (low frequency) Contour and HF
(high frequency) Process is provided to adjust the exact amount of
BBE processing added to your mix.
How it works: Phase and amplitude integrity is essential to accurate
sound reproduction. These relationships define a sound's "sound".
When these complex relationships pass through a speaker, the proper
order is lost. The higher frequencies are delayed. A lower frequency
may reach the listener's ear first or perhaps simultaneously with that of
a higher frequency. The listener perceives this loss of sound integrity
in the reproduced sound as "muddy" and "smeared." BBE Sound,
Inc. conducted extensive studies of numerous speaker systems over a
ten year period. With this knowledge, it became possible to identify
the characteristics of an ideal speaker and to distill the corrections
necessary to return the fundamental and harmonic frequency structures
to their correct order.
Tips for using: A single function button switches the BBE process
on or off, which is useful for comparing the processed sound to the
unprocessed sound. The switch illuminates red when the BBE process
is on. The LF Contour control is for adjusting the level of phase corrected
low frequencies in the program material. The HF Process control adjusts
the level of phase corrected high frequencies in the program material.
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