Choosing business audio: 100V, low impedance and voice evacuation

A good audio system should suit the way a space is used. A restaurant needs comfortable music and clear conversation. A conference room needs speech people can follow. A hotel may need independent music in reception, a restaurant and outdoor areas. Start with those needs before choosing speakers or an amplifier.

Decide what people should hear

Tell us whether the priority is background music, announcements, presentations, live entertainment or a combination. Include the quietest and busiest periods. Music that feels comfortable in an empty restaurant may be difficult to hear during service; turning everything up can make conversation harder.

For shops, think about staff announcements and consistent listening levels. For villas, consider indoor and outdoor listening separately. For conference spaces, describe microphones, remote meetings and the positions of presenters and listeners. These details help define the system before equipment quantities are agreed.

Give each area the right control

A zone is an area you want to control separately. It might need its own volume, a different source or the ability to receive an announcement without interrupting other areas. A room name does not automatically define a zone: two connected dining areas might work together, while a small terrace may need separate control.

Space	Question to settle early
Restaurant or café	Should the terrace and dining room have independent volume?
Shop or showroom	Who can make announcements, and where should they be heard?
Hotel	Which public areas share music, schedules and controls?
Villa or conference room	How will residents, presenters or visiting staff operate the system?

100V and low impedance solve different problems

A 100V distribution system can be a practical option for many speakers spread across a building. Compatible speakers use transformers, and their selected power settings must be included in the amplifier calculation. The 100V description refers to the line rating; it does not mean the audio signal stays at a constant voltage. Yamaha explains the principle in its commercial audio design guide.

Low-impedance systems may suit a smaller listening area, a presentation space or a more demanding music brief. Their design must account for the combined speaker load, amplifier capability and cable losses. Neither approach wins automatically on sound quality. Speaker choice, room acoustics, placement and the listening requirement still matter. Equipment and cable arrangements should be confirmed in the installation design.

Keep voice evacuation as a separate requirement

If the brief includes emergency messages or evacuation, say so at the start. Background music with a microphone is not enough to establish that purpose. Voice evacuation needs its own life-safety design, including the required priorities, monitoring, power arrangements, interfaces and operating procedures.

Bosch’s PRAESENSA configuration manual, for example, distinguishes background music, normal calls and emergency behavior. This is a useful reminder to confirm the manufacturer’s system requirements and the site’s applicable design requirements. A shared speaker arrangement should only be proposed where the complete design supports it. Explore voice evacuation separately from everyday music.

Make daily operation part of the brief

Agree who controls sources and volume, what happens after a power interruption and what staff should do if an area goes silent. Where existing equipment is retained, record its exact model and role. Our mixed-brand planning guide explains why those boundaries matter.

Ask for controls that match the people using them. A busy shift should not depend on finding a password or remembering a complicated sequence just to change the music in one area.

Before handover, check the agreed listening areas, speech functions and controls with the people who will use them. For your enquiry, send a plan, room uses, existing equipment and any outdoor or emergency-message requirements. View our audio systems or discuss your project. You can also explore the system buying guides.

Sources checked 2 November 2026

• Yamaha: low- and high-impedance speaker systems.
• Bosch: PRAESENSA configuration manual, version 2.30.