LL2C STEREO OPTICAL AUDIO LIMITER – SOUND LIMITER FOR CLUBS

Price range: €710.64 through €1,078.51 IVA esclusa

LL2C is a professional stereo optical audio limiter designed to control sound levels while preserving maximum audio signal quality.

Thanks to its fully analog circuitry and the control system based on a resistive optocoupler, the limiter provides smooth, progressive and almost imperceptible limiting, preserving the natural character of the audio program.

Unlike many conventional limiters based on VCA or digital processing, LL2C uses a fully analog signal control system, ensuring a more musical and transparent response even when the limiter is active.

The modern electronic design, the use of selected low-noise components, and the careful quality control of the assembly process provide the LL2C limiter with high reliability, stability and superior audio performance, making it suitable for professional installations.

Description

The LL2C audio limiter has been designed to provide high audio quality, operational safety and long-term stability of the settings, preventing any tampering after calibration.

The main adjustments of the unit, including:

  • input level

  • output level

  • limiting threshold

are located inside the device and adjusted via internal trimmers.

This design choice prevents accidental or intentional modifications to the settings once the system has been installed and calibrated.

All audio connections through connectors are also made inside the unit, increasing installation security and preventing unauthorized modifications or bypass of the system.

If the unit is switched off using the power switch located on the rear panel, the audio signal is completely interrupted, ensuring that no bypass of the limiter is possible.

The level control is achieved through an analog resistive optocoupler, without the use of VCA circuits.
This technical solution allows a more natural, progressive and musical limiting behavior, minimizing audible artifacts in the audio signal.

Installed in a standard 19″ rack – 1 unit, the limiter is typically placed near equalizers and power amplifiers within professional audio systems.

Its smooth and progressive limiting response makes it ideal both for protecting audio systems and for sound level limitation in venues subject to noise regulations, while maintaining high audio quality.

AVAILABLE VERSIONS

The LL2C optical audio limiter is available in different configurations to suit various installation and sound level management requirements.

All versions share the same analog optical limiting circuit of the LL2C base model and maintain the same professional audio quality, but differ in the way the limiting thresholds are managed.

Version 1 – LL2C Standard (base model)

This is the standard version of the LL2C audio limiter.

The unit features one limiting threshold per channel, adjustable via internal trimmers during system installation and calibration.

Input level, output level and threshold adjustments are located inside the unit in order to prevent tampering.

This configuration is ideal for installations where a fixed maximum sound level is required.

Version 2 – LL2C with key-controlled threshold selection

This version allows the configuration of three different limiting thresholds for each channel.

The thresholds can be selected through a mechanical key switch located on the front panel, allowing the venue manager to choose between different pre-configured sound levels set by the installer.

This solution is particularly useful where it is necessary to manage:

  • daytime sound level

  • nighttime sound level

  • temporary higher level for authorized acoustic exemptions

The three thresholds are calibrated during system setup and can then be selected using the front panel key switch.

Version 3 – LL2C with web controller management

This version includes a web-based controller with Wi-Fi access, allowing remote configuration and management of the limiting levels.

The system allows:

  • automatic management of day and night sound levels

  • configuration of temporary exemptions

  • scheduling of permitted levels using a web calendar

  • generation of a history log of all changes and operations

Two user profiles are available:

Administrator profile
managed by the installer, with full configuration and programming access.

User profile
intended for the venue manager, allowing data viewing and authorized level control.

This solution is particularly suitable for installations requiring automated sound level management and traceability of adjustments.

Version 4 – LL2C with web controller and key switch

This version combines the web controller management with the mechanical key switch on the front panel.

The limiter can therefore be managed:

  • via web programming

  • or via manual key selection

providing maximum flexibility in installations where both remote management and local manual control are required.

 

  • stereo audio limiter with two independent channels

  • balanced inputs and outputs

  • connections via XLR male/female and Jack male/female connectors

  • audio connections made inside the unit

  • input, output and threshold adjustment via internal trimmers

  • level control using analog resistive optocoupler

  • no VCA circuits

  • circuitry using low-noise operational amplifiers

  • independent clipping and limiting indicators for each channel

  • frequency response (-3 dB): 20 Hz – 20 kHz

  • internal connections and adjustments

  • 19″ rack enclosure – 1 unit

Dimensions (W × D × H):
48 × 36.5 × 3.9 cm

Weight:
3.1 kg

Additional information

Weight 5 kg
Dimensions 65 × 50 × 25 cm
tipologia

LL2C Standard, LL2C Key Control, LL2C Web Control, LL2C Web + Key Control

The LL2C audio limiter can be used in all installations where it is necessary to control sound levels while maintaining a warm, natural and well-defined audio signal.

Thanks to its analog optical limiting technology, the device reduces signal levels in a transparent and progressive way, avoiding sudden and unpleasant volume variations.

It is particularly suitable for:

  • sound level limitation in public venues subject to noise regulations

  • protection and safeguarding of audio systems

  • professional installations requiring smooth and transparent limiting

  • audio systems for bars, restaurants, clubs, event venues and public spaces

  • applications where it is necessary to prevent excessive sound levels while maintaining high audio quality

The analog optical limiting system ensures natural sound reproduction even during frequent limiter intervention.