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Harman JBL MTC-CBT-70T Transformer

Harman JBL MTC-CBT-70T Transformer
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General Information
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.

Available in black or white (-WH).

Technical Information
Power Rating:120 VA
Power Rating:60 VA
Power Rating:30 VA
Power Rating:15 VA
Input Receptacle Type:Screw Terminal
Output Receptacle Type:Screw Terminal

Power Description
Input Voltage:100 V AC
Input Voltage:70 V AC

Physical Characteristics
Color Family:White
Product Color:White
Form Factor:Cabinet
Height:6.2"
Width:4.5"
Depth:3.4"
Weight (Approximate):2.49 lb

Miscellaneous
Package Contents:
  • MTC-CBT-70T Transformer
  • 2 x 6 mm (15mm length x 1.0 thread pitch) Bolts
  • Flat Washers
  • Lock Washers
Compatibility:JBL Loudspeakers:
  • CBT 70J-1
  • CBT 70JE-1
Certifications & Standards:
  • IP-55
  • UL1876
  • CE
  • C-Tick
Country of Origin:China
Environmentally Friendly:Yes
Environmental Compliance:Waste Electrical and Electronic Equipment Directive (WEEE)

WARNING: This product can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
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Shipping Restrictions
  • This item cannot be shipped to PO Boxes.
  • This item can be shipped only within the U.S.

Special Order Item

This item ships directly from the manufacturer and is not stocked in our warehouse. If stock is available at the manufacturer, the item will ship directly to you, usually within 7 - 15 business days.

Once the order has been sent to the manufacturer it can no longer be canceled.

If payment is made via credit card it will be charged before the order is sent to the manufacturer.

You must contact the manufacturer directly regarding returns and defective items.

We will contact you by email if the item is sold out or backordered (and we were unable to update the site before you placed the order) or if the item will be delayed longer than expected.

We have no control over the speed of the manufacturer's order processing, or whether they will honor your request to ship the item by any particular method.



  • UPC: 691991300790 
  • Mfr's Part #: MTC-CBT-70T-WH