What does an active speaker system mean?

An active speaker system has its own amplifier located inside the enclosure. In many modern designs, there is also a DSP responsible for crossover, limiters, equalization, delays, and other system functions.

Thanks to this, a single set can receive:

• signal audio,
• power supply,
• optionally a control or network connection.

A major advantage is the integration of components. The manufacturer designs the amplifier, DSP, and transducers as one system, so the user does not have to separately select a power amplifier.

From an event perspective, this means quick building of small configurations. Two active sets and subwoofers can create a complete system without a separate amplifier rack.

However, this does not mean that an active system is simple in any scale. With a larger number of sets, power must be supplied to many points, and the infrastructure can become more distributed. 

How does a professional passive system work?

In a passive system, the speaker set does not have its own amplifier. Energy reaches it via a speaker cable from an external amplifier or amplified controller.

In larger concert systems, amplifiers are usually organized in racks. They may include:

• power amplifiers,
• DSP,
• signal distribution,
• networking,
• power,
• system status monitoring.

The advantage is centralization. Many speakers can be managed from one place, and for a tower or suspended system, mainly speaker cables need to be supplied.

In system solutions, the manufacturer defines how sets work with specific amplifiers and presets. This is important because a modern passive system should not be understood as "any speaker plus any amplifier."

The entire ecosystem matters: set, amplification, processing and configuration. 

Differences in cabling and power supply

One of the biggest practical differences concerns where power needs to be supplied.

An active system requires power at each set or each group of active devices. This means running both the signal and power cables.

In a small configuration, this can be very convenient. The speaker sits on a stand, receives the signal and power, and is ready to work.

However, in a large configuration, there are many power points that need to be:

• distributed,
• secured,
• properly routed,
• monitored for load.

In a passive system, amplifiers can be located in central or side racks, and speaker cables are run to the sets.

This does not automatically mean simpler cabling, as a large system can still require many circuits and paths. The difference lies more in the location of infrastructure concentration.

Transport and speed of assembly

Active sets are often very convenient in small mobile systems. There is no need to transport a separate amplifier rack, and each component is relatively self-sufficient.

This can facilitate:

• quick conference setup,
• small corporate events,
• small concerts,
• additional zones,
• monitoring systems.

In a passive system, you need to take the speakers and amplification separately, but at a larger scale, such an architecture can be more organized.

The amplifier rack can be prepared as a ready-made transport module with:

• power,
• network,
• patches,
• processing.

Once the sets are set up, you just need to connect them to the appropriate channels.

In large productions, the speed of assembly depends more on the level of system preparation than on the active/passive division itself.

Scaling large systems

With large systems, it becomes very important how easily you can increase the number of sets and manage the entire infrastructure.

Active systems can also be scaled to very large sizes, but as the number of devices increases, so does the number of points requiring power.

In passive systems, amplification can be grouped in racks assigned to specific parts of the system:

• main PA,
• subwoofers,
• outfills,
• delay tower,
• monitors.

This can simplify the logistics of a large system, especially if the amplifiers allow for remote monitoring of channels and managing processing.

However, this does not mean that every large event should be passive. There are large professional active systems. The key is whether the architecture of the entire solution makes sense for the scale of the project.

Similar to the question whether greater sound system power means better sound, a single technical parameter should not replace the analysis of the entire system.

DSP, limiters and system control

Both architectures can use advanced DSP. The difference mainly concerns where the processing is located.

In an active setup, DSP can be placed directly in the speaker. It can control:

• the crossover,
• limiters,
• equalization,
• delays,
• levels of amplifiers.

In a passive system, these functions can be found in the amplifier or an external processor.

In professional systems, processing is often specifically prepared for a particular model of the setup. It is not just about manual filter adjustments by the user.

A good system solution controls the operation of the transducers and protects them from exceeding certain limits.

From a sound quality perspective, what is more important is how well the amplifier, DSP, and speaker work together, rather than whether the processor is in a cabinet or in a rack.

Redundancy and servicing

Redundancy and servicing is one of the areas where architecture can have practical consequences.

In an active system, a failure of the amplifier module can disable a specific setup. The advantage is that the problem can remain limited to a single cabinet.

On the other hand, replacing the electronics in a suspended setup can be more difficult than swapping out a device located in a rack on the ground.

In a passive system, a failure of one amplifier can affect multiple setups, depending on the configuration. At the same time, access to the amplifier is usually simpler.

Professional systems solve these problems by:

• appropriate channel reserve,
• backup amplifiers,
• monitoring device status,
• the ability to quickly switch the system.

There is no simple answer that one solution is always more reliable. Reliability also comes from the design of redundancy.

Small events – where are active sets convenient?

Active sets are particularly convenient in small and medium implementations, where quick assembly and a small number of components matter.

An example could be:

• a conference,
• a corporate event,
• a presentation,
• a small concert,
• an additional audio zone,
• monitoring for the operator or artist.

Two active sets can create a simple system without an additional amplifier rack. If a low-frequency section is needed, active subwoofers can be added.

Such a system is easy to divide into several independent modules. Each set can operate independently in a specific zone.

Therefore, when choosing sound reinforcement for the number of participants and the type of event active architecture is often very practical in smaller configurations.

However, this does not mean that "active" automatically means "small" or "amateur." It is just a way of organizing electronics.

Large concerts – why are system solutions with external amplification often encountered?

In large concert systems, external amplification can facilitate central management of a large number of setups.

The amplifier rack can power specific parts of the system, and its operator can control in one place:

• levels,
• loads,
• temperatures,
• errors,
• limiters,
• routing.

Additionally, on stage constructions or towers, there is no need to distribute mains power to each speaker enclosure.

This approach is particularly convenient for large groups of line arrays and extensive subwoofer sections.

However, this is not a rule stating that a large concert must use passive PA. In practice, there are various architectures.

When designing a sound system for a large event the most important factors are its efficiency, directionality, scalability, control, and logistical capabilities.

Does the type of speaker power affect sound quality?

The mere fact that a speaker is active or passive does not determine its sound quality.

The result is influenced much more by:

• drivers,
• the design of the enclosure,
• amplifier,
• DSP,
• crossover,
• limiters,
• directionality,
• tuning of the entire system.

A well-designed active setup can sound very good. Similarly, a high-quality passive system with the right amplified controller.

A poorly designed system, however, will remain weak regardless of where the power amplifier is located.

It is exactly the same mechanism that describes the topic of what determines the quality of sound during a concert. Quality is the result of the entire chain and the way it is used.

What should decide when choosing?

When choosing a system, it is not worth starting with the question “active or passive?”. First, you need to define the requirements of the event.

The following are important:

• scale of the system,
• number of zones,
• required SPL,
• method of transport,
• installation time,
• available power,
• lengths of cable runs,
• needs for redundancy,
• control and monitoring,
• service during the event.

In a small setup, the convenience of active systems can be a very great advantage. In a large system, centralized amplifier racks may prove to be more practical.

The main conclusion is simple: architecture should result from the design, not be a goal in itself. The organizer event does not have to choose between active and passive PA based on marketing simplifications. The right solution should arise from the requirements of the specific event.

Summary

Active and passive sound systems differ primarily in the way amplifiers and processing are arranged. In an active system, the electronics are housed in the set's enclosure, while in a passive system, they are usually concentrated in external racks or controllers.

Active sets are often convenient for small and medium events, as they allow for a quick setup of a simple configuration. Passive systems perform well in large implementations, where centralization of amplification, scalability, and servicing matter.

However, quality should not be assessed based solely on architecture. The result is determined by the entire system: transducers, amplifiers, DSP, directionality, headroom, design, and tuning. The best solution is the one that best meets the specific event.

Frequently asked questions