PreSonus SL Room Control - Manual (Page 21)

4 Speaker Groups
4.6 Speaker Edit Page
SL Room Control
User Guide
19
Polarity (18sAI only). Remotely enables/disables polarity reverse.
When enabled, the Polarity button reverses the polarity of the summed input signal.
Power User Tip: Reversing the polarity can improve the system’s response when low-
frequency waveforms from the subwoofer are reinforced or cancelled by waveforms from
another subwoofer or from the low-frequency drivers of the full-range loudspeakers. This
is a complex interaction that also includes room acoustics, so setting it is best done by ear.
Mode. Remotely changes the DSP Contour mode.
Your StudioLive AI-series loudspeaker is equipped with different DSP contours.
These contours change the character of your StudioLive loudspeaker
in a fundamental way, adjusting FIR filters, alignment, and crossover
settings to customize your loudspeaker for different applications.
• Normal. Normal mode sets dynamics and equalization for optimum performance
for live sound reinforcement. This mode is suitable for most live applications.
• LBR Source (full-range only). StudioLive AI-series loudspeakers are designed to
provide high-resolution, accurate reproduction of high-quality recordings and
live mixes. When low-bit-rate MP3s are played, the unusual clarity of AI speakers
may reveal the artifacts of MP3 compression to an unflattering degree. The LBR
Source contour is specifically designed to reduce the audibility of these artifacts.
• Floor Monitor (full-range only). Floor Monitor mode sets dynamics and
equalization for optimum results when the loudspeaker is used as a floor monitor.
• Extended LF (18sAI only). Inserts a subharmonic bass
synthesizer to extend extreme deep bass response.
Because these contours are changing fundamental tuning parameters,
your StudioLive AI-series loudspeaker will mute momentarily
while the new parameters load. Because of this, do not change
the DSP contour once your performance has begun.
Volume. Controls the input level of your loudspeaker’s DSP.
The Volume control consists of five elements:
• On/Off switch. By default, level control is off. To
enable it, click or tap the On/Off switch.
• Level readout. This displays the input level for the onboard
DSP. You can also manually enter the level in decibels you
wish to set by clicking or tapping in this field.
• Fader. This controls the level of your loudspeaker.
• 0.2 dB increment/decrement buttons. Use these buttons
to make fine adjustments to your loudspeaker level.
Power User Tip: By setting both the line input and speaker output
level controls on the back panel of your loudspeaker to 0 dB (that is, no
attenuation), you can limit the maximum level the speaker can achieve. This
is especially useful in situations where multiple people have access to the
loudspeaker system, and SPL constraints are imposed on the venue.
Alignment Delay. Controls the output delay for your loudspeaker. You can delay
your loudspeaker up to 500 ms in 0.1 ms increments.
The Alignment Delay control consists of five elements:
• On/Off switch. By default, alignment delay is off. To
enable it click or tap the On/Off switch.
• Time readout. This displays the delay time in milliseconds. You can also manually
enter the time in milliseconds you wish to set by clicking or tapping in this field.
• Fader. This controls the alignment-delay time for your loudspeaker
in whole milliseconds. Note: Do not make drastic changes to the
alignment delay time while passing audio through your loudspeaker.
• 0.1 ms increment/decrement buttons. Use these buttons to make fine
adjustments to your loudspeaker’s delay time.