JBL MTC-CBT-70T - White - Bolt-On Transformer Module for CBT 70 Models - Hero
JBL MTC-CBT-70T - White - Bolt-On Transformer Module for CBT 70 Models - Hero
  • JBL MTC-CBT-70T - White - Bolt-On Transformer Module for CBT 70 Models - Swatch Image
  • JBL MTC-CBT-70T - Black - Bolt-On Transformer Module for CBT 70 Models - Swatch Image

JBL MTC-CBT-70T

MTC-CBT-70T is a bolt-on transformer module to adapt CBT 70J-1 and CBT 70JE-1 (and CBT 70J-1/JE-1 arrays) for use on distributed loudspeaker lines. It allows long cable runs and multiple speakers to be driven from a single distributed system amplifier channel. Transformer taps include 120W, 60W, and 30W for 70V and 100V distributed lines, plus 15W for 70V only. Connections are made via customer-supplied cable to screwdown terminals inside the enclosure. Two gland nuts are provided – one for the cable into the enclosure from the amplifier and one for the cable from the enclosed terminal strip to the input terminal of the loudspeaker. The gland nuts form a water-tight seal when used with round jacketed cable with outside diameter between 4.0 mm (0.16 in) and 9.0 mm (0.36 in). The tap selection is made via the terminal connection of the cable from the power amplifier to the appropriate terminals on the internal terminal strip. Mounting holes are provided that fit via two 6 mm screws to any of the two side-by-side insert points on the back of the CBT 70J-1 or CBT 70JE-1 cabinet. Note that MTC-CBT-70T extends 86 mm (3.4 in) from the back of the CBT cabinet.

Product Specifications

General Specifications

Transformer Taps 120W, 60W, 30W (and 15W at 70V only)
Connection CE-compliant barrier strip terminals. Terminals accept up to 8 mm outside 4 mm inside open-lug (#6 or #8) plus bare wire up to 2.5 mm2 (12 AWG).
Terminal 1 Common (black wire from transformer)
Terminal 2 120W @ 70V, N/C @ 100V (orange wire from transformer)
Terminal 3 60W @ 70V, 120W@100V (purple wire from transformer)
Terminal 4 30W @ 70V, 60W @ 100V (blue wire from transformer)
Terminal 5 15W @ 70V, 30W @ 100V (white wire from transformer)
Terminal 6 N/C (no wire from transformer)
Terminal 7 + Output to loudspeaker + terminal (yellow wire from transformer)
Terminal 8 – Output to loudspeaker - terminal (green wire from transformer)
Maximum Insertion Loss Less than 1 dB at any tap
Gland Nuts Two total. One gland nut by the transformer selection terminals for cable from amplifier and one gland nut by the transformer secondary terminals (green and yellow wires) for output to speaker terminals. It is recommended to orient gland nuts toward bottom of enclosure. Watertight seal requires round jacketed cable with outside diameter between 4.0 mm (0.16 in) and 9.0 mm (0.36 in).
Mounting to Speaker Cabinet Two holes in the back of the enclosure 70 mm (2.75 in) apart. Insert included 6 mm screw from inside MTC-CBT-70T enclosure, using 1 flat washer and 1 lock washer, into the side-by-side M6 insert points on the back of the CBT70J-1 or CBT70JE-1 cabinet.
Environmental Capability IP-55 rated, per IEC529. UV, moisture and salt-spray resistant
Agency Rating Transformer UL registered per UL1876, Isolating Signal and Feedback Transformers for Use in Electronic Equipment.
Included Accessories Two 6 mm (x 15mm length x 1.0 thread pitch) bolts, flat washers & lock washers

Dimension Specifications

Dimensions (H x W x D) 157 x 114 x 86 mm (6.2 x 4.5 x 3.4 in) including gland nuts. 128 mm (5.0 in) enclosure height for enclosure only.
Net Weight 1.13 kgs (2.5 lbs)
Shipping Weight 1.36 kgs (3.0 lbs)
Please consult the documents for in-depth specs

Documents & Downloads

What’s in the Box

  • 1 x MTC-CBT-70T
  • 2 x 6 mm (x 15mm length x 1.0 thread pitch) bolts, flat washers & lock washers

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