PreSonus StudioLive 328AI - Manual (Page 18)

14
3 Hookup
3.1 Rear-Panel Connections and Controls
StudioLive ™ AI-Series Loudspeaker
Owner’s Manual
3.1.2 18sAI Subwoofer
Line Inputs. The 18sAI features two line-level inputs. These balanced
combo connections are provided to connect your subwoofer to a
StudioLive digital mixer or other mixing console. The line inputs will
accept up to a +24 dBu source before clipping.
Power User Tip: Two inputs are provided in order to accept a
stereo signal from the output of the mixing console. Both channels
should be connected, as the low-frequency content from both
channels of a stereo signal is summed before the lowpass filter.
However, if the mixing console output signal is mono only, or if you are sending
low-frequency channels (bass, kick, keyboards, etc.) to a separate aux or subgroup
output for the subwoofer only, either input may be used. If you are using two
18sAI subwoofers and running your system in stereo, connect the Left side to
Input 1 of the left 18sAI and the Right side to Input 1 of the right 18sAI.
Outputs. Two line-level outputs (1 and 2) are provided to pass the
stereo signal from the subwoofer to full-range StudioLive AI-series
loudspeakers. The outputs are parallel to Inputs 1 and 2, respectively.
For more information on connecting multiple loudspeaker systems,
see the hookup diagrams in Sections 3.5 through 3.8.
Mono Switch. The Mono switch sums Inputs 1 and 2 and patches the summed signal
to Outputs 1 and 2. This feature is especially useful when running stereo full-range
systems with multiple mono subwoofers.
Sub Level. The Sub level knob determines the output level (volume) of the
subwoofer power amplifier. It has no effect on the signal level from Outputs 1 and 2.
You can adjust the speaker level from -12 dB to +12 dB. Signal level sent to the
subwoofer outputs is not affected by the Sub level control.
Power User Tip: A subwoofer can significantly change the frequency response
of a full-range system. A 4-way system with a subwoofer will be 6 to 18 dB hotter
below 80 to 100 Hz. Set the appropriate level for your subwoofer before adjusting
your system EQ. When used with a StudioLive mixer and StudioLive AI-series
full-range loudspeakers, the Sub level knob can typically be set to 0 dB.
DSP Contours. Your 18sAI Subwoofer is equipped with two 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 one of two applications:
• Normal. Optimized for use with mixers and full-range loudspeakers.
• Extended LF. Inserts a subharmonic bass synthesizer
to extend extreme deep bass response.
Because these contours are changing fundamental tuning parameters,
your 18sAI will mute momentarily while the new parameters load. Because
of this, do not change the DSP Contour once your performance has begun. Press
the recessed button below the User LED repeatedly to step between the contours.
User Layer. The User Layer accesses DSP settings that you create using SL Room
Control software. This layer contains Low Pass Filter, Delay, and Group settings.
Parameter adjustments in SL Room Control are automatically stored in the DSP
memory in real-time. You can also create and load user presets from SL Room
Control. For more information on SL Room Control, see the SL Room Control
Reference Manual. Press and hold the recessed button below the User LED to turn
the User Layer on or off. This will apply the User Layer parameters on top of the
currently selected DSP Contour when you are not connected to SL Room Control.