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General| Audio Channels | Mono |
|---|---|
| Frequency Response | 50 Hz - 20 kHz |
| Speaker Outputs | 70V, 100V |
| Power Supply | 50/60Hz |
| Input Impedance | 20kΩ (unbalanced) |
| Output Impedance | 4Ω |
Covers instructions on reading, retaining, following, cleaning, attachments, environment, accessories, ventilation, and power sources.
Covers electrical safety, grounding, power cord protection, overloading, object entry, servicing, damage, parts, checks, and lightning protection.
Explains the meaning of Warning, Caution, and Note symbols used throughout the manual.
Warns against opening the unit when connected to mains due to exposed parts causing electric shock.
States that there are no user-serviceable parts and service must be done by qualified personnel.
Details the Plena universal amplifier as a mono mixer with 4 input channels, adjustable levels, and headphone monitoring.
Identifies front panel elements including VU meter, power indicator, power switch, tone controls, volume controls, and headphone jack.
Lists and describes rear panel connections such as DIN, XLR, Cinch inputs/outputs, power switch, and fuse.
Explains setting priority modes (serial, blocking, mixing) using jumpers JP109 and JP111-JP114.
Details selecting between microphone and line level inputs, and mic/aux input selection via switches and jumpers.
Describes enabling or disabling the speech filter for each channel using jumpers to improve intelligibility.
Details setting insertion, cascade, or emergency modes using jumper JP301 and the Ins/Casc switch.
Provides instructions for mounting the pre-amplifier in a 19-inch rack using provided brackets and removing feet.
Explains connecting a 24 Vdc backup power supply (e.g., batteries) and the importance of an in-line fuse.
Details connecting microphones or line-level sources to the unit's inputs (XLR, DIN, Cinch) and priority feature requirements.
Guides on setting the Ins/Casc switch for insertion mode (external devices) and cascade mode (linking pre-amplifiers).
Explains connecting master or direct outputs to booster amps or other system pre-amplifiers, noting priority relay contacts.
Details using the emergency input for announcements, its VOX activation, priority, and independent volume control.
Explains adjusting volume, treble, and bass for individual channels and overall volume via the master knob.
Describes using the 'Select' switch and headphone jack for monitoring single channels or the master output.
Details electrical parameters like voltage, power, and performance metrics such as frequency response and distortion.
Lists sensitivity, impedance, S/N ratio, and headroom for various input and output connections.
Covers interconnection details, relay specifications, operating/storage temperatures, and humidity.
Provides general information including EMC standards, unit dimensions, and weight.
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