PLENA all-in-one 90W mixer amplifier

Microphone and line inputs
The mixer amplifier has four microphone inputs.
Separate level controls are available for all the inputs.
For all the inputs (except Aux input), phantom power
can be switched on to provide power to condenser
microphones. Inputs 1 and 2 can be configured
between line and mic level sensitivity. Input channel 1
can take priority over all other microphone and music
inputs. Input 1 can be activated by contact closure on
the PTT (push to talk). For input 1,a 2-tone chime can
be configured to precede an announcement.
Music source and music input
The unit has one music input and an internal music
source. There is a source select button on the front
panel to select between auxiliary input and internal
music source. The internal music source plays MP3
files from an SD/MMC card or USB device with a
capacity of up to 32 GB. The player will automatically
search and play all playable MP3, WMA files and has
repeat and random play modes. The following formats
are supported: MP3, WMA files with bit-rates from 32
FM Tuner
The digitally controlled FM tuner uses a frequency
synthesizer for accurate capture of radio stations and
has five presets to store favorite radio stations.
A 100V emergency/telephone input with VOX
activation is provided for easy integration with another
PA system or a telephone paging system. It has its own
preset volume control and overrides all other inputs,
including music input and mic/line inputs. The unit
also has a line output to add booster amplifiers for
larger systems with more output power. The unit has a
24 VDC input for backup power supply.
An LED VU meter monitors the master output. A
headphone socket, below the VU meter, provides the
mixer output. The power is directly available on 100 V
or 70V constant voltage connections and on a low
impedance connection for a 4 ohm load.
Controls and indicators
Front Panel
• Power on switch and LED
• LED VU meter for master output
• Master volume control
• Four volume control knobs for microphone inputs
• Volume knob for background music
• Source select button for music source
• Knob for treble level
• Knob for bass level
• Headphone socket
Rear Panel
• Four Inputs and one Aux input
• Dip switches
• Master output
• Telephone/Emergency input with volume control
• 100V,70V and 4 Ohm loudspeaker outputs
• 24 VDC Backup input


Technical specifications


Mains Power Supply

Voltage:- 230 VAC, ±15%, 50Hz

Inrush Current PLN-1AIO090-IN:- 9A

Battery power supply

Voltage:- 24 VDC, ±15%, with reverse protection

Current:- 6.8 A


Frequency response:- 50Hz to 20kHz (+1/-3dB@ -10 dB ref. rated output)

Distortion:- < 1% @ rated output power, 1 kHz

Low Control:- Max -8/+8 dB

Hi Control:- Max -8/+8 dB

Inputs Input 1 (push-to-talk contact with priority):- 5-pin Euro style, balanced, phantom

Input 2:- 3-pin XLR, balanced, phantom

Input 3 and 4:- TRS Jack (1/4, 6.3 mm), balanced, phantom

Sensitivity:- 1 mV (mic); 200 mV (line)

Impedance:- ?1 kohm (mic.); >5 kohm (line)

S/N at rated power:- ?60 dB (mic); >65 dB (line)

CMRR (mic.):- >40 dB

Phantom power supply:- 9V via 1.2 kohm (mic)

Speech filter:- -3 dB @ 315 Hz, high-pass, 6 dB/oct

Music Input

Connector:- Cinch, stereo converted to mono

Sensitivity:- 200 mV

Impedance:- 22 kohm

S/N at rated power:- ?70 dB

Master Output

Connector:- 3-Pin XLR, balanced

Nominal level:- 1 V

Input Impedance:- <100 Ohm

Emergency/Telephone Input

Connector:- 5-pin, Euro style pluggable screw terminal

Sensitivity (telephone):- 100 mV – 1 V adjustable

Sensitivity (100 V):- 10 V – 100 V adjustable

Impedance:- >10 kohm

S/N at rated power:- >65 dB

VOX:- Threshold 50 mV; attack time 150 ms; release time 2 s

Loudspeaker Output:- 100V,70V and 4 Ohm

Connector:- Euro style pluggable screw terminal, Floating

Max./Rated Power:- 120W/90W

Loudspeaker Output from 4 Ohm:- 19.0V from 4 Ohm output


Dimensions (H x W x D):- 100 x 430 x 270 mm

Mounting:- Stand-alone, 19″ rack

Color:- Charcoal

Weight:- Approx. 6.5 kg


Operating temperature:- -10 °C to +55 °C

Storage temperature:- -40 °C to +70 °C

Relative humidity:- <95%


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