Professional Speakers: How to Choose the Perfect Speakers for Public Spaces and Outdoors

What are the differences between active and passive speakers for professional applications?

Choosing between active and passive speakers is the first step in designing a professional audio system. Understanding the distinctive characteristics of each type allows you to select the most appropriate solution based on the application context, available budget, and the specific technical requirements of the project.

Active speakers integrate a power amplifier directly into the speaker cabinet. This configuration offers significant advantages in terms of practicality and sound quality. The internal amplifier is designed specifically for the drivers installed in the speaker, ensuring electro-acoustic optimization that is difficult to achieve with generic external amplifiers. Professional models such as the Avante Achromic series from American Audio, available in the Amlux catalog, also incorporate DSP processors that enable advanced signal management, with preset equalizations for different application contexts.

The Avante series includes models with different power ratings and sizes to suit every need. The Avante A10 loudspeaker features a 10-inch driver and is ideal for small rooms or as a monitor. The Avante A12, with a 12-inch woofer and 400W of power, offers adequate sound coverage for conference rooms, small theaters, and houses of worship. For more demanding applications, the Avante A15, with a 15-inch driver and 500W of power, is the professional choice for concerts, outdoor events, and permanent installations in large spaces.

Passive loudspeakers, without built-in amplification, require external amplifiers to operate. This configuration offers greater flexibility in power management and allows amplification to be centralized in a technical rack. Passive loudspeakers are particularly suitable for complex permanent installations where multiple sound reinforcement points need to be managed from a single central location. Their wider frequency range and superior power handling make passive loudspeakers preferable for live music and high-volume applications.

The Imperio system, available in the Amlux catalog, represents a particularly interesting hybrid solution. It is a mini satellite line array amplified with 240W Class D power, ideal for small to medium-sized spaces. The line array configuration allows for controlled sound directionality, reducing unwanted reflections and improving speech intelligibility, an essential feature in conference rooms, auditoriums, and houses of worship.

How do 100V wireless systems work, and when are they the ideal solution?

100V wireless systems (or constant voltage) represent the professional standard for audio distribution in installations with multiple speakers spread across large surfaces. This technology has established itself as the optimal solution for shopping malls, airports, stations, hospitals, schools, and any context requiring uniform sound coverage across large spaces through multiple diffusion points.

The operating principle is based on the transformation of the audio signal from low impedance (typically 4-8 ohms) to high voltage (100V in Europe, 70V in North America). This conversion is performed by a step-up transformer located in the amplifier, while each speaker is equipped with a step-down transformer that reduces the signal to the operating levels of the acoustic transducer. The main advantage is the ability to connect multiple speakers in parallel without impedance issues, using small-diameter cables even for long distances.

The Amlux catalog offers various professional solutions for 100V systems. The OMNITRONIC WP-1H pendant speaker is a versatile solution for large areas with high ceilings. With IP44 protection, this 20W RMS two-way coaxial speaker is ideal for both indoor and semi-protected outdoor applications. The system offers three selectable power outputs (5W, 10W, 20W), allowing the volume of each speaker to be individually adjusted to the specific needs of the area covered.

The technical specifications of the WP-1H highlight the advantages of 100V systems: a frequency range of 130-15,000 Hz suitable for speech and background music, a sensitivity of 92 dB, and an 8-inch woofer that ensures accurate reproduction even of mid-low frequencies. The scratch-resistant ABS plastic housing and IP44 certification ensure resistance to splashes of water and dust, making it suitable for porches, covered but not completely enclosed areas, and areas subject to frequent cleaning.

100V systems are the ideal solution when the following conditions apply:

• Need to install more than 4-5 speakers in the same system
• Significant distances between the amplifier and the speakers (over 20-30 meters)
• Requirement for independent volume control for different zones
• Priority for speech intelligibility over Hi-Fi music quality
• Constrained budget for cabling and amplification

For installations in shopping centers, hospitals, or schools, the ability to expand the system by adding speakers without modifying the amplifier is a significant advantage. Furthermore, zonal management allows different messages to be directed to specific zones, an essential feature for security announcements, targeted commercial communications, or differentiated environmental sound systems.

Why choose horn speakers for announcements and voice messages in public spaces?

Horn speakers are a proven and reliable technical solution for broadcasting voice messages and announcements in outdoor and semi-outdoor public spaces. The unique acoustic geometry of the horn offers specific advantages that make it indispensable in numerous professional applications, despite technological evolution having introduced more sophisticated alternatives.

The operating principle of the horn speaker is based on the coupling of a highly efficient compression driver and an acoustic loading horn. This configuration generates high sound pressure levels with limited electrical power, reaching SPL (Sound Pressure Level) levels exceeding 105 dB at one meter distance with just 15-25W of power. Controlled directionality allows the sound energy to be concentrated in a specific direction, reducing dispersion and improving long-distance coverage.

Amlux offers two professional OMNITRONIC models particularly suitable for outdoor installations. The IP56-rated HS-35 horn speaker delivers 15W RMS power and a 400-5000Hz frequency range optimized for speech reproduction. The weatherproof ABS plastic enclosure and IP56 certification ensure complete dustproofing and protection against powerful water jets, making this speaker ideal for parking lots, loading docks, industrial areas, and installations exposed to the elements.

For applications requiring more power, the HR-25 horn speaker delivers 25W RMS in an IP44-rated aluminum enclosure. The metal enclosure ensures superior robustness and optimal heat dissipation, essential for permanent installations subject to intensive use. Both models operate on a 100V line, allowing for integration into complex sound reinforcement systems.

Ideal applications for horn speakers include:

• Parking lots and rest areas, for announcements and service announcements
• Railway and subway stations, for travel information
• Outdoor sports facilities, for news and announcements
• Industrial zones and construction sites, for safety announcements
• Campgrounds and resorts, for information messages
• Ports and marinas, where resistance to salt spray is required

The swivel mounting bracket supplied with OMNITRONIC speakers allows for precise aiming, essential for optimizing sound coverage and directing sound to areas of interest while avoiding reflections off reflective surfaces. The frequency response curve, focused on the vocal range (400-5000 Hz), sacrifices reproduction of extreme frequencies in favor of greater speech intelligibility, a key feature for announcements and emergency communications.

What characteristics should a sound system have for churches and houses of worship?

The sound reinforcement of churches and houses of worship presents unique technical challenges that require a specific design approach. The typical architecture of these buildings, characterized by high volumes, reflective surfaces, and long reverberation times, makes achieving adequate speech intelligibility particularly complex. The choice of speakers and their correct placement are crucial to the success of the installation.

The Avante Achromic series professional loudspeakers were specifically designed for applications including houses of worship and represent a balanced technical solution for these installations. The distinctive feature of these loudspeakers is their nominally controlled coverage of 90° x 60° (horizontal x vertical), which allows sound energy to be directed toward the assembly area while reducing reflections off walls and vaults. The integrated DSP offers specific presets optimized for reverberant environments, with equalizations that attenuate problematic frequencies and improve intelligibility.

The extended frequency range of the Avante models (45-60 Hz up to 20 kHz) ensures faithful reproduction not only of vocals but also of liturgical music and instruments used in celebrations. The 400W Avante A12 is often the optimal choice for medium-sized churches (200-400 seats), while the 500W A15 is suitable for large basilicas and cathedrals. The ability to reach 121-124 dB of peak SPL ensures adequate dynamic headroom to cover moments of high sound intensity without distortion.

For more complex installations or smaller churches, the Imperio mini line array system offers significant advantages. The line array configuration, even in the compact version, produces a cylindrical waveform that maintains uniform sound energy over greater distances than traditional spherical radiation speakers. The 240W Class D driver ensures adequate power while maintaining compact dimensions, an important aspect for discreet installations that must not visually impact the sacred architecture.

An often overlooked aspect of sound reinforcement for houses of worship is the management of low frequencies. Reverberant environments tend to accumulate energy in the low frequencies, creating reverberations that compromise intelligibility. Avante speakers, thanks to DSP control, allow the low-frequency response to be tailored, reducing energy below 100 Hz when necessary. For installations requiring quality music reproduction, the addition of dedicated subwoofers allows for the separation of low-frequency management, maintaining a clean mid-high range crucial for speech.

Durability and reliability are key criteria for permanent installations in houses of worship. Professional speakers must guarantee continuous operation for decades, withstanding temperature fluctuations and variable humidity levels. The Avante series, designed for permanent installations and professional touring, offers superior components and a robust construction suited to these requirements.

How to design audio for shopping malls and retail spaces?

Shopping malls and retail spaces require multifunctional audio systems capable of managing background music, commercial announcements, and emergency messages. The design must take into account the architectural complexity typical of these environments, characterized by large open spaces, passageways, commercial areas, and services distributed across multiple levels. The goal is to create a pleasant sound environment that enhances the shopping experience without being invasive or tiring.

100V wired sound systems are the standard solution for shopping malls thanks to their flexibility, scalability, and zonal management. The ability to deploy dozens or hundreds of speakers powered by a few centralized amplifiers greatly simplifies installation and maintenance. The IP44-rated OMNITRONIC WP-1H speaker is particularly suitable for common areas of shopping malls, where protection against dust and humidity is important to ensure long-term reliability.

Loudspeaker layout in a shopping center follows uniform coverage criteria, avoiding both dead zones and excessive overlap that generates reflections and confusion. For corridors and shopping malls, a typical 6-8 meter spacing between speakers ensures sound continuity without dead spots. Food court areas, characterized by high ambient noise, require higher speaker density or higher SPL solutions to maintain adequate intelligibility.

For medium-sized stores in shopping centers, the Avante AS8 column system offers a compact and powerful solution. With 800W of dynamic power distributed between the 8-inch subwoofer and satellite columns, this system ensures high music quality while maintaining a compact footprint. The integrated three-channel mixer allows for independent management of the store's audio, with the option of connecting music sources, microphones, and instruments. The column configuration with SAM (Secure Array Mount) system ensures stability and facilitates transportation, an important aspect for retailers setting up temporary spaces or participating in promotional events.

Specific considerations for shopping centers:

• Zonal management to target advertising messages to specific areas
• Integration with security systems for priority emergency messages
• Time-based programming to adapt volume and music content to visitor flows
• Specific equalization to compensate for the variable acoustics of open spaces and shops

The EN 54-24 standard for emergency sound systems establishes specific requirements for installations in public places. Speakers used in shopping centers must ensure a minimum STI (Speech Transmission Index) intelligibility of more than 0.5 under normal conditions and 0.45 under emergency conditions. Amplifier redundancy and continuous monitoring of audio lines are mandatory requirements for installations falling under this standard.

What audio solutions are ideal for museums and art galleries?

The sound system for museums and art galleries presents unique requirements that balance technical, aesthetic, and conservation needs. Audio must be present yet discreet, providing information and multimedia content without disrupting visitors' contemplative experience or competing with the visual impact of the exhibits. The design challenge is to create localized listening zones that minimize interference between adjacent areas.

For museum installations, the compact active speakers of the Avante series offer an optimal balance between sound quality, compact size, and installation flexibility. The Avante A10, with its elegant design and compact size, integrates discreetly into exhibition spaces. The cabinet can be mounted on a stand, suspended from the ceiling, or wall-mounted using special brackets, allowing the configuration to be adapted to the architectural characteristics of each room.

Interactive multimedia installations, increasingly common in contemporary museums, require speakers capable of faithfully reproducing not only speech but also soundtracks, environmental effects, and musical content. The Avante speakers' extended frequency range (45-60 Hz up to 20 kHz) and high color rendering index (CRI) ensure accurate reproduction of complex audio content. The integrated DSP allows the frequency response to be tailored to compensate for the acoustic characteristics of exhibition rooms, often characterized by reflective surfaces and irregular volumes.

For temporary exhibitions and mobile installations, the AS8 column system offers significant advantages. The free-standing configuration eliminates the need for permanent support structures, a key aspect in museum spaces where invasive interventions are often problematic. The low weight (subwoofer and columns) and included carrying bag facilitate movement between different rooms or exhibition locations. The high-efficiency Class D amplifier reduces energy consumption, an increasingly important aspect in installations certified for environmental sustainability.

Specific considerations for museums and galleries:

• Controlled directionality to limit sound diffusion to areas of interest
• Moderate sound pressure levels (60-70 dB) to avoid visitor fatigue
• Speaker aesthetics compatible with the exhibition context
• No forced ventilation in the speakers to avoid mechanical noise
• Optional color customization for architectural integration

For archaeological sections or areas housing particularly sensitive artifacts, the absence of UV radiation and electromagnetic emissions of modern professional speakers ensures optimal preservation of the artworks. Contemporary audio systems use Class D amplification technologies that generate minimal heat, an important aspect in air-conditioned environments where any heat source can disrupt the delicate thermohygrometric balance necessary for conservation.

How to choose durable speakers for pools and aquatic environments?

Audio installations near pools, spas, water parks, and marine environments require speakers with superior environmental protection features compared to standard outdoor applications. Continuous exposure to high humidity, water spray, chlorine, salt spray, and temperature fluctuations requires the selection of components certified to withstand these extreme conditions without compromising reliability and sound quality.

The IP (Ingress Protection) rating defined by IEC 60529 classifies the resistance of electronic devices against dust and liquids. For applications in aquatic environments, it is essential to understand the meaning of the different IP ratings and select the appropriate level based on the specific water exposure. The first digit indicates protection against solid objects (dust), while the second defines protection against liquids.

The IP56-certified OMNITRONIC HS-35 horn speaker offers complete protection against dust (digit 5) and protection against powerful jets of water from any direction (digit 6). This rating makes it suitable for perimeter installations in indoor and outdoor pools, where splashing is common. The weather-resistant ABS plastic housing and corrosion-resistant mounting bracket ensure durability even in the presence of chlorine and water treatment chemicals.

For semi-protected applications such as porches, covered relaxation areas, or changing rooms, the IP44-rated OMNITRONIC PCW-30 column speaker offers a balanced solution. Its 45W RMS power and column configuration with six 2.5-inch drivers ensure uniform sound coverage across large areas. The 170-15,000 Hz frequency range is suitable for background music and announcements, while the 92 dB sensitivity ensures high efficiency, reducing amplification requirements.

In addition to the IP rating, construction materials play a key role in the durability of aquatic installations. Anodized aluminum offers superior corrosion resistance compared to standard alloys, while AISI 316 stainless steel is the premium choice for marine environments where saltwater accelerates corrosive processes. The ABS engineering plastics used in OMNITRONIC speakers ensure dimensional stability and UV resistance, essential for installations exposed to the sun.

Pool audio design must consider the high ambient noise generated by swimmers, water movement, and filtration systems. Higher sound pressure levels than standard applications are necessary to ensure adequate intelligibility. Horn speakers, thanks to their high efficiency and directionality, often represent the optimal solution for covering large surfaces with low power, reducing amplification and wiring costs.

What IP protection criteria are required for outdoor speakers?

Selecting the correct IP rating for outdoor speakers requires a careful analysis of the specific environmental conditions of the installation. There is no one-size-fits-all solution: seemingly similar installations may require significantly different degrees of protection based on factors such as direct exposure to the elements, the presence of partial covers, proximity to water sources, dust levels, and air salinity.

The IEC 60529 standard defines the IP (Ingress Protection) rating system using two digits. The first digit (0-6) indicates the level of protection against solid objects, while the second (0-9) defines the protection against liquids. For professional outdoor applications, it is essential to understand the precise meaning of each level to avoid both costly oversizing and undersizing that would compromise reliability and longevity.

The IP56-certified OMNITRONIC HS-35 loudspeaker offers complete protection against dust (digit 5 ​​= total protection against dust ingress) and protection against powerful jets of water from any direction (digit 6 = powerful jets similar to sea waves). This certification makes it suitable for installations fully exposed to the elements, including particularly harsh environments such as marinas, construction sites, industrial areas, and installations near fountains or water features.

For semi-protected installations, the IP44 rating represents a balanced compromise between protection and cost. The OMNITRONIC WP-1H and HR-25 loudspeakers, both IP44-certified, offer protection against solid objects greater than 1 mm (digit 4) and against splashes of water from any direction (digit 4). This certification is suitable for porches, canopies, installations under eaves, and areas protected by awnings or temporary coverings. Exposure to occasional heavy rain will not compromise operation, as long as the installation is not subject to prolonged standing water.

Factors to consider when selecting the IP rating:

• Direct exposure to rain, snow, or hail requires a minimum of IP44, with IP55-IP56 preferred.
• Dusty environments (industrial areas, construction sites, dirt roads) require a minimum rating of 5.
• Proximity to the sea or waterways requires IP56 or higher to resist salt spray and splashes.
• The speaker's orientation affects exposure: upward-facing installations require greater protection.

It is essential to understand that the IP rating defines the degree of protection of the external enclosure, but does not automatically guarantee the durability of the internal components in prolonged extreme conditions. OMNITRONIC professional speakers use drivers and electronic components specifically selected to withstand the temperature fluctuations, humidity, and vibrations typical of outdoor installations. The 100V line transformers are impregnated with protective resins that ensure insulation even in high humidity conditions.

Proper installation is an often overlooked but crucial aspect to ensuring the protection stated by the IP certification. Power cables must be laid with downward curves (drip channels) to prevent water from pooling on the cable glands. Mounting brackets must allow the speaker to be tilted slightly downward to facilitate the drainage of any accumulated water. Connectors and junction points must be protected with special waterproof boxes or, when possible, positioned in areas sheltered from direct exposure.

Selecting professional speakers for public spaces and outdoors requires technical expertise and in-depth knowledge of available solutions. Amlux supports professionals and installers in the design of complex audio systems, offering specialized technical support and certified products that comply with current regulations. The catalog includes solutions for every application, from the Avante series active speakers to the 100V OMNITRONIC wired systems, including line array configurations and outdoor horn speakers.

For detailed technical information on professional audio systems and assistance in designing your sound system, contact the Amlux technical team.