Univox PLS-7 Induction Loop Amplifier Owner’s Manual

: June 14, 2024
: univox

Table of Contents

Univox PLS-7 Induction Loop Amplifier
Features
Enhanced metal loss compensation
Technical specifications
Back panel interface
Front panel interface
Other Functions
CONTACT
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Univox PLS-7 Induction Loop Amplifier

Univox-PLS-7-Induction-Loop-Amplifier-PRODUCT

Features

Dante PoE input for additional network audio (option)
High dynamic performance through linearized switching
High power – 100 Vpp & 20/2×10 Arms
Parametric metal loss compensation
Built-in system diagnostics
Fan-free convection cooling
Automatic safe mode
50-100 V high voltage speaker input
High slew rate audio IC internally used
Fast-action AGC with an exceptional constant and stable linear output
Low-frequency masking filter – voice enhancement
Voltage peak indicator
Fault monitor indication LED
ULD supported for easy project planning
5-year warranty

High-efficient linearized switching loop amplifier

Univox PLS-7 and its phased array sibling SLS-7 are powerful induction loop amplifiers designed for very large-area loop installations. PLS-7 delivers up to 100Vpp/20 Arms while the SLS-7 drives up to 100 Vpp and 10 Arms per channel. With wide dynamic response from complementary balanced outputs, PLS/SLS-7 drivers provide excellent dynamics with top audio quality. Our ground-breaking filter bank eliminates any Class-D associated non-linearity or interference. Due to la Class-D low heat dissipation, the drivers claim no extra ventilation space in your AV rack. Developed on Univox linear switching technology, with electronic transformers and fan-free design, PLS-7 and SLS-7 are two new long-life reliable products from Univox.

Intelligent system monitoring
Apart from the self-diagnostic system, PLS/SLS-7 features continuous monitoring of the input and output logic, warning for any inconsistency within the loop function. A built-in output relay allows for easy connection to a smart mixer or a monitor computer.

Enhanced metal loss compensation

Univox PLS/SLS linear tech series is equipped with a unique Parametric MLC (Metal Loss Compensation) control, enabling system frequency response correction in environments where the signal strength is strongly influenced by the surrounding metal.

Univox-PLS-7-Induction-Loop-Amplifier-FIG-1

Coverage

PLS-7	Free Field	Moderate metal loss*	High metal loss**
1:1 ratio	Approx. 600 m2***	Approx. 50 m2***	Not recommended
1:2 ratio	Approx. 1.200 m2 ***	Approx. 100 m2 ***	Not recommended
Figure 8	Approx. 4.200 m2	Approx. 2.300 m2	Approx. 1.000 m2
SLS-7	Free Field	Moderate metal loss*	High metal loss**
---	---	---	---
Max coverage	Approx. 4.200 m2	Approx. 2.000 m2	Approx. 1.000 m2
Low spill****	Approx. 1.200 m2 ****	Approx. 100 m2 ****	Not recommended

4.5 dB attenuation, max 7 m loop segment width
8 dB attenuation, max 4 m segment width
The larger coverage area is limited by the max 6 dB field strength variation stated by IEC 60118-4
SLS standard loop design (2m wide loop segments with cancellation segments)

Technical specifications

Univox PLS-7 Univox SLS-7

Induction Loop Output RMS 125 ms

Max drive voltage 100 Vpp 100 Vpp
Max drive current 20 Arms 2×10 Arms

Power

Power supply 110-240 VAC primary switched class VI electronic power supply
Power consumption, idle 137 mA 126 mA
@1.10 Ohm impedance load 80 W 45 W

Back panel interface

Input 1

Balanced XLR
Dip switch programmable: Low Cut Filter@150 Hz – Flat/Speech;
Line/Mic; Phantom Power +12 VDC On/Off
Sensitivity: -55 dBu (1.5 mVrms) to +10 dBu (2.6 Vrms)
Dante RJ45 Ethernet input PoE (option)

Input 2

Balanced Phoenix Screw Terminal Block
Dip switch programmable: Low Cut Filter@150 Hz – Flat/Speech; Line/50-100 V connection On/Off; Override On/Off
(Input 3 signals higher than -6 dB above AGC-knee overrides all other input signals)
Line sensitivity: -15 dBu (50 mVrms) to +20.6 dBu (8.3 Vrms)

Input 3

Unbalanced RCA or Phoenix Screw Terminal Block
Sensitivity: -24dBu (30 mVrms) to +16.2dBu (5 Vrms)

Monitor control

Recessed trim potentiometer for 10 W speaker and 3.5 mm front panel headphone output.
Phoenix Screw Terminal Block

Loop error

Speaker monitor output; 24 V power output; Relay output to the mixer
Phoenix Screw Terminal Block

Front panel interface

Input 1-3

Recessed trim pots; 4 LED input level indicators (-18 dB to +12 dB)

Parametric Metal Loss Control

Recessed trim pot, adjustable gain slope from 0 to 4 dB/octave;
Switchable frequency knee point (100 Hz, 500 Hz,1 kHz, 2 kHz)

System diagnostics

Checks Input connection, AGC, Pre and Power driver and Loop conductor with a pulsed 1.6kHz signal (built-in signal generator)
On/Off switch to operate the system, single LED indication
Loop current control Recessed trim pot; 4 LED output level indicator (0-9 dB)
Peak indicator LED indicates clipping due to voltage saturation
Loop fault indicator LED indicates an error in the loop function
Temp indicator Automatic safe mode activated
Monitor output 3.5 mm jack to monitor loop with headphones
The power indicator LED indicates the correct connection to a power supply

Other Functions

Frequency response: 75-6800 Hz
Distortion, power loop driver: < 0.05 %
Distortion, system: < 0.15 %
Dual action AGC: Dynamic Range: > 50-70 dB (+1.5 dB)
Attack time: 2-500 ms, Release time: 0.5-20 dB/s
Cooling: Fan-free convection cooling
IP class: IP20
Size: 1U/19 ” rack mount. Width 430 mm, Depth 146 mm, Height 44 mm (excl. rubber feet)
Weight (net): 2.30 kg 2.31 kg
Mounting options: Rackmount (brackets included), wall mount or freestanding (rubber feet pre-mounted)