Bose Professional 40191 70V Transformer White

Product Description

The BOSE PROFESSIONAL 40191 is a 70-volt line transformer designed for use with compatible ceiling and surface-mount speakers in distributed audio systems. This transformer steps down the 70V line-level signal to the speaker's operating level, enabling multiple speakers to be wired in parallel across a single amplifier circuit without excessive impedance loading. It is a standard accessory installed by audio-visual technicians, low-voltage electricians, and commercial sound contractors working on paging, background music, or intercom systems.

This transformer is suited for commercial and light commercial audio distribution applications where a 70-volt constant-voltage architecture is required. Typical install scenarios include offices, retail spaces, schools, and hospitality environments. The white finish integrates with standard ceiling tile and speaker grille aesthetics. It is sold individually as a single unit.

Key Features

• 70-volt constant-voltage transformer for distributed audio wiring
• Enables parallel multi-speaker wiring on a single amplifier output
• White finish suited for ceiling and wall-mount speaker installations
• Sold as a single unit for targeted replacement or system expansion

Compatibility

Designed as an OEM-style accessory transformer for 70-volt distributed speaker systems. Consult the speaker model documentation to confirm tap wattage and impedance matching before installation.

Installation Notes

Installation should be performed by a qualified low-voltage technician or licensed electrician in accordance with applicable NEC requirements for audio signal wiring. Power down the amplifier and confirm the circuit is de-energized before making any connections. Do not exceed the transformer's rated wattage tap, and verify impedance compatibility with the amplifier output before energizing the system.