PreSonus StudioLive 328AI - Manual (Page 16)

12
3 Hookup
3.1 Rear-Panel Connections and Controls
StudioLive ™ AI-Series Loudspeaker
Owner’s Manual
3 Hookup
3.1 Rear-Panel Connections and Controls
3.1.1 Full-Range Models: 312AI, 315AI, and 328AI
Microphone Input. Your AI-series full-range loudspeaker is equipped with a
PreSonus XMAX™ microphone preamplifier for use with most microphone types. The
XMAX solid-state preamplifier has a Class A input buffer, followed by a dual-servo
gain stage. This arrangement results in ultra-low noise and wide gain control,
allowing you to boost signals without increasing unwanted background noise.
A 12V phantom-power supply is present on the microphone input at all times.
XLR connector wiring for phantom power:
Pin 1 = GND Pin 2 = +12V Pin 3 = +12V
WARNING: Phantom power can severely damage some dynamic
microphones, especially ribbon mics. Therefore, we recommend reviewing
your microphone’s documentation prior to use to ensure that it will not be damaged
by low-level phantom power. Note that the supplied 12V may not be adequate for
some condenser mics.
Microphone Input Level. Adjusts the gain level of the Microphone input.
Power User Tip: It is very important to properly adjust this control in order to minimize
noise and avoid overload distortion. Follow the level-setting instructions in Section 2.1
before operating a channel.
Line Input. This is a balanced XLR / ¼” TRS combo connection for line-level input.
Use the Line input to connect the loudspeaker to a StudioLive digital mixer
or other mixing console, either directly or through the Line in/out connectors on a
StudioLive S18sAI subwoofer. The Line input will accept a signal level of up to
+24 dBu before clipping.
Line Input Level. Adjusts the gain level of the Line input. Like the Microphone Input
Level, it is very important to properly adjust this control in order to minimize noise
and avoid overload distortion. This knob provides attenuation control only. In most
situations, you will set this control fully clockwise to 0 dB. However, if your line-level
source has a very high-gain output, you may need to attenuate it to avoid clipping
the ADC.
Note: As with any amplifier or active loudspeaker, plugging in a microphone or a
line-level input device, will create a momentary spike in the audio output of your
StudioLive full-range loudspeaker. Because of this, it is highly recommended that
you turn down the channel trim or power down your loudspeaker before changing
connections. This simple step will add years to life of your audio equipment.
Mix Out. A balanced Mix output is provided on an XLR-M connector. The Mix Out
connection is used to send signals connected to the inputs of your loudspeaker to
other StudioLive-series loudspeakers. The Mix output signal is the same as the signal
sent to the loudspeaker’s internal amplifier, and it may be derived from the
microphone input, the line input, or a mix of both.
Power User Tip: When cascading to the Line Input on a second speaker
from the Mix Out, set the Line Input Level on the second speaker to 0 dB
and use the Speaker Level control to attenuate the volume as needed. In
this way, you will maximize signal clarity and minimize distortion.