JBL Professional MTC-300T150 - 150W Transformer for 70V/100V Distributed Lines
The JBL Professional MTC-300T150 is a high-power line transformer designed to integrate loudspeakers into 70V and 100V distributed audio systems . It belongs to the JBL Control 300 series ecosystem and is intended for professional installations where long cable runs, multiple zones and precise control of the power delivered to each listening point are required. Its color-coded wiring simplifies installation and reduces errors, and its slot- in format allows for quick and reliable mounting, including integration into the MTC-300BB12 back box used in the large-format in-ceiling models of the series.
Main features
-
Nominal power: 150 W for 70 V / 100 V systems.
-
Power taps and primary colors:
-
Orange: 150 W @ 70 V (not connected to 100 V).
-
Blue: 75W @ 70V | 150W @ 100V.
-
Black: Common.
-
Secondary (to speaker): Yellow (+) and Green (−).
-
Secondary cable length: 2 × 711 mm, for easy connection inside the box.
-
Main dimensions: 86 × 78 × 86 mm (width × height × depth), compact for ceiling installations.
-
Fixing: 4 slots 12 × 6 mm; center-to-center distances approx. 71 × 66 mm.
-
Mechanical Compatibility: Intended mounting location on the Control 300 Series MTC-300BB12 back box.
-
Intended use: High impedance distributed speaker lines (PA, Public Address and Background Music).
Product benefits
-
Efficient audio distribution in long installations: allows for long cabling runs with lower loss and parallel connection of multiple speakers.
-
Zone level adjustment thanks to the 75 W and 150 W sockets, to balance coverage and amplifier load.
-
Professional and safe installation with color-coded conductors and standardized mounting pattern.
-
Integration into JBL systems as part of the Control 300 ecosystem, common in commercial and corporate spaces.
Use cases
- Shops, shopping centers, and restaurants with ambient music and announcements by area.
- Hotels, convention centers, and corporate buildings with distributed PA systems.
- Educational centers, auditoriums and common areas where uniform coverage is required.
Frequently Asked Questions
-
Which socket is used on 100 V systems? Use the blue conductor for 150 W; the orange conductor is not used on 100 V.
-
What products is it mechanically compatible with? The MTC-300BB12 (back box), which includes an internal stud mount for mounting the transformer inside the JBL Control 300 series.
-
How do you connect the secondary wires? Yellow to the positive (+) pole of the speaker and green to the negative (−) pole .
Description for projects
JBL MTC-300T150 line transformer for 70 V / 100 V systems, power 150 W. Taps: 150 W @ 70 V (orange), 75 W @ 70 V / 150 W @ 100 V (blue), common (black). Secondary: yellow (+), green (−). Dimensions 86 × 78 × 86 mm; fixing slots 12 × 6 mm (x4) with center-to-center 71 × 66 mm. Secondary wire length 2 × 711 mm. Compatible with MTC-300BB12 backbox of the Control 300 series.
