Jbl Professional MTC-SBT300 Speaker Transformer 300W

Product Description

The JBL PROFESSIONAL MTC-SBT300 is a multi-tap 300-watt speaker transformer designed for 70V and 100V distributed audio systems. It serves as a line-matching device that allows low-impedance loudspeakers to connect to constant-voltage amplifier outputs — the standard architecture used in commercial and industrial PA installations. The transformer provides multiple tap selections so the installer can set per-speaker wattage levels directly at the enclosure, giving granular control over zone volume without additional attenuation hardware. It is installed by audio system technicians and electricians working on distributed sound infrastructure.

The MTC-SBT300 is suited for commercial audio installations where a 70V or 100V constant-voltage backbone is used to drive multiple speaker zones from a single amplifier channel. Typical applications include retail spaces, warehouses, houses of worship, schools, and other facilities requiring wide-area speech or music coverage. It is sold individually and integrates into speaker enclosure assemblies or surface-mount speaker systems as an add-on or replacement transformer component.

Key Features

• 300-watt power handling supports high-output commercial audio zones
• Compatible with both 70V and 100V constant-voltage distributed systems
• Multi-tap design allows selectable per-speaker wattage at the transformer
• Designed for in-line or in-enclosure installation in commercial speaker systems
• Sold as a single unit for replacement or new-build applications

Compatibility

Designed as an OEM-style replacement or add-on transformer for commercial 70V and 100V distributed speaker systems. Consult system design documentation to confirm wattage tap and impedance requirements before installation.

Installation Notes

Installation should be performed by a qualified audio systems technician or licensed electrician familiar with NEC requirements for distributed audio wiring. De-energize the amplifier and verify zero voltage on the distribution line before making any wiring connections. Tap selection should be determined during system design to ensure total connected load does not exceed amplifier output capacity. Do not exceed the 300-watt rated input of this transformer.