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100V Amplifiers PA Installation

100V Amplifiers PA Installation

Rondson offers a wide range of mixer amplifiers. Discover our various power levels and functions adapted to the specificities of your Public Address installation.

These amplifiers feature 100 Volt transformers and are also compatible with low-impedance use.

  • Mixing amplifiers with audio sources

    Our 100-volt mixer amplifiers with multimedia players and built-in audio sources such as FM Tuner, CD MP3, USB port, or Bluetooth offer the possibility of broadcasting background music, a commercial announcement, or a pre-recorded message over the entire speaker line in order to communicate with the people present in the building.

  • Multizone matrix amplifiers

    Rondson offers a wide range of matrix amplifiers, designed to broadcast several zones of a building with audio content adapted and managed according to the zones. Equipped with 100 volt transformers, these amplifiers allow Public Address sound reinforcement in establishments receiving the public.

  • Zoning mixer amplifiers with sources...

    Our multi-zone mixing amplifiers with integrated audio sources allow you to broadcast background music, sound advertising or a microphone call in different areas of a public place directly from the amplifier. This broadcasting is done from a CD player, Bluetooth, Tuner or USB integrated directly to the amplifier. 

  • Digital amplifiers

    rondson power amplifiers

    Digital power Amplifiers amplify an audio signal to provide the necessary power (in watts) to operate a 100 volt in-line speaker line for a Public Address installation.

FAQs Questions / réponses

How to calculate the necessary amp power for a 100V line installation?

The power of a 100V line amplifier is calculated according to this simple formula:

Amp power = (Sum of speaker powers) + Margin + Line losses

Detailed calculation steps :

Step 1 : Add the powers of all your speakers

Example : 10 speakers of 5W + 5 speakers of 10W = 100W total
Step 2 : Add a safety margin of 20-30%

100W + 25% = 125W
Step 3 : Integrate losses online (usually 3-5% depending on length)

Recommended final power: 130-135W minimum

Advice :

Always choose an amplifier with a power 30% higher than your calculated needs. This ensures a reserve of dynamics and avoids saturation during sound peaks.

Which section of cable to use for a 100V line installation depending on the distance?

The cable section depends on the power transported and the length of the circuit:

Section/distance reference table:

Power

Distance ≤100m

Distance 100-200m

Distance 200-500m

≤ 50W

1,5 mm²

2,5 mm²

4 mm²

50-150W

2,5 mm²

4 mm²

6 mm²

150-300W

4 mm²

6 mm²

10 mm²

>300W

6 mm²

10 mm²

16 mm²

Essential wiring rules :

Minimize losses: Insufficient cross-section causes voltage drops that reduce the power available to remote enclosures.

Shielded cable recommended: Use shielded audio cable to avoid interference, especially in industrial environments.

Parallel installation: All speakers connect in parallel on the 100V line, unlike low impedance systems.

Points of vigilance :

- Check the linear resistance of your cable (Ω/km)
- Plan margins for future extensions
- Respect the minimum curvature radii

Can we mix speakers of different powers on a 100V line?

Yes, this is one of the main advantages of the 100V line! This flexibility is impossible with traditional low impedance systems.

Advantages of power mixing:

Adaptation by zone :

- 10W Office Wall Speakers

- 30W speakers for corridors

- 20W speakers for halls

Total scalability :

- Adding speakers without impedance recalculation

- Modification of individual powers via the transformers

- Gradual extension of the installation

Technical principle :

Each 100V line speaker incorporates a step-down transformer with power selector (2.5W / 5W / 10W / 20W). You individually adjust each diffusion point according to your acoustic needs.

Rules to follow :

1) Total power: The sum must not exceed the power of the amplifier

2) Homogeneous distribution: Avoid excessive power differences between nearby speakers

3) Coverage calculation: Adapt the power to the volume and reverb of each zone

This flexibility makes the 100V line the preferred choice for complex multi-zone installations.

What are the constraints of a 100V line installation outdoors ?

Outdoor installations require specific precautions to ensure reliability and longevity,

Environmental constraints:

Protection against humidity :

- Enclosures with protection rating IP65 minimum (total watertightness)

- IP67 Waterproof Junction Boxes

- Cables with UV sheath and water resistant

Resistance to thermal variations :

- Guaranteed operation from -20°C to +70°C

- Tropicalized components (transformers, electronics)

- Ventilation adapted for the amplifier

Recommended technical solutions :

Tropicalized enclosures :

- UV-treated membrane speakers

- Encapsulated and waterproof transformers

- Stainless grids and supports

Electrical installation :

- Reinforced grounding

- 30mA differential protection mandatory

- Ventilated and heated electrical cabinets

Preventive maintenance :

- Semi-annual monitoring of connections

- Cleaning of speaker grilles

- Verification of the tightness of the housings

What are the different types of 100V line amplifiers and how to choose ?

The 100V line amplifier market offers several configurations depending on the complexity of your installation:

Standard 100V line amplifiers (mono/stereo)

Basic configuration for simple installations :

- 1 to 2 line outputs 100V with fixed power

- Classic audio inputs: XLR, RCA, Jack

- Optimal use: small businesses, offices, warehouses

- Current powers: 30W to 250W

- Advantages: Economical price, ease of use, proven reliability

Multizone 100V line amplifiers,

Independent management of several areas : 

- 2 to 8 distinct zones with individual adjustment

- Multiple sources assignable by zone

- Separate volume control for each space

- Announcement priorities with automatic mitigation

Professional applications :

- Shopping malls with separate areas (shops, corridors, parking)

- Multi-space restaurants (room, terrace, bar)

- Hotels (reception, rooms, common areas



Matrix 100V line amplifiers,

High-end solution for complex installations :

- Integrated audio matrix: flexible routing from sources to zones

- Advanced DSP: equalization, delays, zone limiters

- Network management: control via IP, home automation integration

- Redundancy: automatic failover in case of failure